CN105939179A - System and method for monitoring input audio, broadcasting state and modulation amplitude of medium-wave transmitter - Google Patents

System and method for monitoring input audio, broadcasting state and modulation amplitude of medium-wave transmitter Download PDF

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Publication number
CN105939179A
CN105939179A CN201610452194.8A CN201610452194A CN105939179A CN 105939179 A CN105939179 A CN 105939179A CN 201610452194 A CN201610452194 A CN 201610452194A CN 105939179 A CN105939179 A CN 105939179A
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China
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audio
transmitter
amplitude
signal
audio signal
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魁斌
阿不力孜·牙生
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Xinjiang Uygur Autonomous Region Broadcast And Film Bureau Transmission Center
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Xinjiang Uygur Autonomous Region Broadcast And Film Bureau Transmission Center
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Priority to CN201610452194.8A priority Critical patent/CN105939179A/en
Publication of CN105939179A publication Critical patent/CN105939179A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/56—Arrangements characterised by components specially adapted for monitoring, identification or recognition covered by groups H04H60/29-H04H60/54
    • H04H60/58—Arrangements characterised by components specially adapted for monitoring, identification or recognition covered by groups H04H60/29-H04H60/54 of audio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/29—Arrangements for monitoring broadcast services or broadcast-related services
    • H04H60/32—Arrangements for monitoring conditions of receiving stations, e.g. malfunction or breakdown of receiving stations

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transmitters (AREA)

Abstract

The invention provides a system and a method for monitoring an input audio, a broadcasting state and modulation amplitude of a medium-wave transmitter. The system comprises an intelligent switching module, a signal pre-processing module, an electronic volume control module and a monitoring processing module. The system for monitoring the input audio, the broadcasting state and the modulation amplitude of the medium-wave transmitter can switch and output audio signals with maximum authority and high-level signal state, can carry out audio amplitude adjustment automatically for to-be-broadcasted audio signals through an audio amplitude control signal to ensure the quality of the audio signals, can carry out real-time monitoring for the playing state of the medium-wave transmitter through a parallel mode which combines a wireless acquisition mode with a wired acquisition mode, and can give an alarming prompt in time when the medium-wave transmitter is in an abnormal broadcasting state, thereby removing faults, preventing broadcasting stopping accidents from occurring in the medium-wave transmitter, guaranteeing safe broadcasting and guaranteeing the quality of the broadcasted audio signals; and the system also can give an alarm remotely, is intelligent and convenient, and has relatively strong practicability.

Description

Medium wave transmitter input audio frequency, broadcast state and modulation monitoring system and method
Technical field
The present invention relates to signal transmission technology field, be specifically related to medium wave transmitter input audio frequency, broadcast shape State and modulation monitoring system and method.
Background technology
MW Transmitting Station mainly undertakes the relay task of central and provincial radio programmes, its signal source master If satellite-signal, fiber-optic signal and microwave signal etc., it is ensured that the uninterrupted output of program is to broadcast electricity It is particularly important from the point of view of platform.
When the signal broadcasted breaks down, need manually to switch it to into other signal of output, Cannot ensure to switch in time, or the signal of switching also breaks down, it will broadcasting accident occurs, if All signal all breaks down, or manual switching troubleshooting is not in time, it will occurs breaking accident, causes Broadcasting is forced to interrupt, it is impossible to ensure safe broadcast.
It addition, while transmitter broadcasts audio signal, in addition it is also necessary to complete to ensure " the three of audio signal Full " (full time, full power, full modulation degree) broadcast, but due to the instability of signal source and difference Signal attenuation under environment, often produces impact to transmitter modulation, causes modulation differential mode, it may be assumed that Ovennodulation or bad broadcast.Ovennodulation not only causes distorted signals, also transmitter is caused damage, the most then fall height Pressure protection causes moment to break, heavy then cause burning out of the parts such as power amplifier in transmitter, directly contribute break with Economic loss unnecessary.Bad broadcast, cause the degradation of signal audibility and broadcast quality, cause broadcasting Accidents happened；Further, since transmitter broadcasts the adjustment of power not in time, transmitter can be made to broadcast power low In the 80% of rated power, the situation of emergent power differential mode；The time period of broadcast singal is broadcasted at transmitter In, if modulation degree differential mode or power differential mode occur, can cause transmitter within the described setting time period Have no idea the broadcast of full time, it is impossible to complete broadcast plan, time of occurrence differential mode；If it is the most right The power of medium wave transmitter, modulation degree and time state monitor and warning reminding, meeting in time timely Cause troubleshooting not in time, and then cause occurring breaking accident, cause broadcasting to be forced to interrupt, it is impossible to ensure peace Full broadcast.
Summary of the invention
The technical problem to be solved be just to provide medium wave transmitter input audio frequency, broadcast state with Modulation monitoring system and method, it is possible to by monitoring the audio amplitude of multipath audio signal, broadcast When the audio signal gone out breaks down, according to authority intelligence switching output audio signal；And can be by sending out The modulated carrier signal penetrating machine output carries out real-time monitoring process, it is ensured that the full modulation degree of audio signal is broadcasted, By the way of wireless collection and wired collection, the broadcast state of transmitter is carried out Real-time Collection monitoring, sentence Whether disconnected transmitter there is broadcast differential mode, and reports to the police in time when occurring and broadcasting differential mode, it is to avoid occur Broadcast accident.
According to one aspect of the present invention, it is provided that medium wave transmitter input audio frequency, broadcast state and amplitude modulation Degree monitoring system, described system includes that intelligence handover module, signal pre-processing module, electronic sound volume control Module and monitor processing module；
Described intelligence handover module, carries out turning for reception is provided with the multipath audio signal of authority order Change process, and obtain the audio amplitude value of each road audio signal according to conversion process and described authority is suitable Sequence, switching output one tunnel audio signal is to described signal pre-processing module；
Described signal pre-processing module, for using dynamic gain to the peak value of the described audio signal received Mode carries out processing makes it maintain in the numerical range of setting, and by defeated for the audio signal after pretreatment Deliver to described electronic sound volume control module；
Described electronic sound volume control module, for the audio amplitude control sent according to described monitor processing module Signal processed carries out audio amplitude regulation to the described audio signal received, and by the audio signal after regulation It is delivered to transmitter to broadcast；
Described monitor processing module, for according to transmitter broadcasts what information process obtained The broadcast power of transmitter and amplitude modulation angle value, the broadcast monitoring state to transmitter, and according to institute State amplitude modulation angle value and produce described audio amplitude control signal.
Medium wave transmitter input audio frequency, broadcast state and the tune provided in the present invention is provided Amplitude monitoring system, it is possible to intelligence switching output authority is maximum and signal condition is the audio frequency of high level state Signal, it is ensured that the uninterrupted broadcast of audio signal；And can be treated by audio amplitude control signal and broadcast The audio signal gone out carries out audio amplitude regulation automatically, it is ensured that the quality of audio signal；It addition, pass through nothing The parallel mode that line acquisition mode and wired acquisition mode combine, the broadcast state to medium wave transmitter Monitor in real time, and when differential mode occurs broadcasting in medium wave transmitter, carry out warning reminding in time, thus Carrying out troubleshooting, it is to avoid medium wave transmitter occurs breaking accident, it is ensured that safe broadcast, intelligence is convenient, practical Property is stronger.
Further, described intelligence handover module specifically includes: holding wire allocation unit, for by reception The multipath audio signal being provided with authority order carries out isolating and after Filtering Processing, being delivered to the first single-chip microcomputer The input of chip and audio select unit；
Audio select unit, processes with monitoring for the multipath audio signal sending holding wire allocation unit The audio signal that the transmitter that module sends receives is monitored；
First singlechip chip, is converted to often for the multipath audio signal of reception is carried out A/D respectively The audio amplitude value of one tunnel audio signal also sends to amplitude display unit, and according to each road audio signal Audio amplitude value determine each road Audio Meter state；
Audio switching unit, for according to described authority order and each road Audio Meter shape State, the road audio signal that switching output authority is maximum and level state is high level；And in institute When stating system malfunctions or power-off, straight-through any one road audio signal extremely described transmitter that exports is to enter Row broadcasts；
Amplitude display unit, the audio frequency width of each road audio signal for the first singlechip chip is sent The audio amplitude value of the audio signal that the transmitter that angle value and monitor processing module send receives shows；
Audio alarm unit, for the level that at least a road audio signal is corresponding in multipath audio signal State is to report to the police during low level.
Use the beneficial effect of above-mentioned further scheme: can each according to the multipath audio signal received Road audio amplitude value and default authority order, intelligence switching output authority is maximum and signal condition is high The audio signal of level state, it is ensured that the uninterrupted broadcast of audio signal, and ensure the audio frequency matter broadcasted Amount, it is to avoid broadcast accident occurs；And output audio signal is led directly to when system malfunctions or power-off, Maintain the normal broadcast of transmitter, it is ensured that will not break because system equipment fault causes.
Further, described electronic sound volume control module includes high-fidelity dual pathways volume control chip and second Singlechip chip, specifically for corresponding according to the ovennodulation received or undermodulation audio amplitude control signal Reduce or increase the audio amplitude of audio signal, until the amplitude modulation angle value of described audio signal is in default Normal amplitude modulation angle value in the range of, wherein, described audio amplitude control signal is pulse square wave signal.
Use the beneficial effect of above-mentioned further scheme: treat the sound of broadcast according to audio amplitude control signal Frequently signal carries out audio amplitude regulation automatically, it is ensured that the broadcast quality of audio signal.
Further, described monitor processing module specifically includes: wired monitoring processing unit, for passing through The modulated carrier signal that the transmitter of wired mode collection broadcasts processes, and obtains the broadcast merit of transmitter The audio amplitude value that the audio signal of rate, amplitude modulation angle value and reception is corresponding, according to broadcasting power and amplitude modulation The angle value broadcast monitoring state to transmitter, produces audio amplitude control signal always according to amplitude modulation angle value And be delivered to electronic sound volume control module, and by audio amplitude value corresponding for the audio signal of transmitter reception It is delivered to amplitude display unit；
Wireless monitor processing unit, for the field intensity information launching the transmitter wirelessly gathered Process, obtain the audio signal broadcasting power, amplitude modulation angle value and reception of transmitter with corresponding Audio amplitude value, according to broadcasting power and the amplitude modulation angle value broadcast monitoring state to transmitter, and will The audio signal that transmitter receives is delivered to audio select unit and width respectively with corresponding audio amplitude value Degree display unit；
Differential mode alarm unit, for carry out when transmitter occurs and broadcasts differential mode local acousto-optic interlink warning and Remote alarms.
Use the beneficial effect of above-mentioned further scheme: the modulated carrier that can broadcast MW Transmitting Station is believed Number carry out real-time monitoring process, produce audio amplitude control signal according to the amplitude modulation angle value of transmitter；And energy Enough parallel modes combined by wireless collection mode and wired acquisition mode, to medium wave transmitter Broadcast state monitors in real time, and when differential mode occurs broadcasting in medium wave transmitter, carries out warning in time and carry Wake up, thus carry out troubleshooting, it is to avoid medium wave transmitter occurs breaking accident, it is ensured that safe broadcast, additionally it is possible to Carry out remote alarms.
Further, described wired monitoring processing unit, specifically include: cymoscope, for collection Modulated carrier signal is sampled, rectification and detection process, obtain transmitter modulation audio-frequency information and Carrier information；
A/D converter, for calculating the modulation of transmitter according to described audio-frequency information and carrier information It is worth, broadcasts the audio amplitude value that the audio signal of power and transmitter reception is corresponding；
High-speed microprocessor, for according to described amplitude modulation angle value determine the modulation condition of transmitter and calculate right The modulation ratio value answered, and the power rating of transmitter is determined according to described broadcast power, and by transmitter The audio amplitude value that the audio signal of reception is corresponding sends to amplitude display unit；
Volume increases square-wave generator, for when transmitter is in undermodulation state, produces pulse width It is worth the undermodulation audio amplitude control signal corresponding with undermodulation ratio value；
Volume reduces square-wave generator, for when transmitter is in ovennodulation state, produces pulse width It is worth the ovennodulation audio amplitude control signal corresponding with ovennodulation ratio value.
Use the beneficial effect of above-mentioned further scheme: transmitting can be determined according to the amplitude modulation angle value of transmitter The modulation condition of machine also calculates the modulation ratio value of correspondence, and produce pulse width values and modulation ratio value Corresponding undermodulation audio amplitude control signal or ovennodulation audio amplitude control signal, treat broadcast The audio amplitude of audio signal be adjusted.
According to another aspect of the present invention, it is provided that medium wave transmitter input audio frequency, broadcast state and amplitude modulation Degree monitoring method, said method comprising the steps of:
S1, intelligence handover module are provided with the multipath audio signal of authority order to reception to be carried out at conversion Reason, and audio amplitude value and the described authority order of each road audio signal is obtained according to conversion process, Switching output one tunnel audio signal is to signal pre-processing module；
The peak value of S2, the described signal pre-processing module described audio signal to receiving uses dynamic gain side Formula carries out processing makes it maintain in the numerical range of setting, and the audio signal after pretreatment is carried To described electronic sound volume control module；
The audio amplitude control signal docking that S3, electronic sound volume control module send according to monitor processing module The described audio signal received carries out audio amplitude regulation, and is delivered to launch by the audio signal after regulation Machine is to broadcast；
S4, described monitor processing module according to transmitter is broadcasted information process obtain send out Penetrate broadcast power and the amplitude modulation angle value of machine, the broadcast monitoring state to transmitter, and according to described Amplitude modulation angle value produces described audio amplitude control signal.
Beneficial effects of the present invention: in the present invention provide medium wave transmitter input audio frequency, broadcast state with Modulation monitoring method, it is possible to intelligence switching output authority is maximum and signal condition is the sound of high level state Frequently signal, it is ensured that the uninterrupted broadcast of audio signal；And can be treated by audio amplitude control signal The audio signal broadcasted carries out audio amplitude regulation automatically, it is ensured that the quality of audio signal；It addition, pass through The parallel mode that wireless collection mode and wired acquisition mode combine, the broadcast shape to medium wave transmitter State monitors in real time, and when differential mode occurs broadcasting in medium wave transmitter, carries out warning reminding in time, from And carrying out troubleshooting, it is to avoid medium wave transmitter occurs breaking accident, it is ensured that safe broadcast, and intelligence is convenient, real Stronger by property.
Further, described S1 specifically includes: S11, the MCVF multichannel voice frequency letter being provided with authority order that will receive After number carrying out isolation and Filtering Processing, carry out A/D respectively and be converted to the audio frequency of each road audio signal Range value, and determine each road Audio Meter shape according to the audio amplitude value of each road audio signal State；
S12, according to described authority order and each road Audio Meter state, switching output power The road audio signal that limit is maximum and level state is high level state, and breaking down or during power-off Straight-through any one road audio signal that exports is broadcasted to transmitter；
S13, the transmitter that audio amplitude value and the monitor processing module of each road audio signal send is connect The audio amplitude value of the audio signal received shows, and an at least road audio frequency in multipath audio signal The level state that signal is corresponding is to report to the police during low level；
S14, to sending out that multipath audio signal and the monitor processing module after isolation and Filtering Processing sends The audio signal that machine of penetrating receives is monitored.
Use the beneficial effect of above-mentioned further scheme: can each according to the multipath audio signal received Road audio amplitude value and default authority order, intelligence switching output authority is maximum and signal condition is high The audio signal of level state, it is ensured that the uninterrupted broadcast of audio signal, and ensure the audio frequency matter broadcasted Amount, it is to avoid broadcast accident occurs；And output audio signal is led directly to when system malfunctions or power-off, Maintain the normal broadcast of transmitter, it is ensured that will not break because system equipment fault causes.
Further, described S3 specifically includes: according to the ovennodulation received or undermodulation audio amplitude control Signal correspondence processed reduces or increases the audio amplitude of audio signal, until the modulation of described audio signal Value is in the range of default normal amplitude modulation angle value, and wherein, described audio amplitude control signal is pulse Square-wave signal.
Use the beneficial effect of above-mentioned further scheme: treat the sound of broadcast according to audio amplitude control signal Frequently signal carries out audio amplitude regulation automatically, it is ensured that the broadcast quality of audio signal.
Further, described S4 specifically includes: the modulated carrier signal that S41, wired collection transmitter broadcast, The field intensity information that wireless collection transmitter is launched simultaneously, carries out process to modulated carrier signal and obtains transmitter Audio amplitude value corresponding to audio signal broadcasting power, amplitude modulation angle value and reception, and according to described Amplitude modulation angle value produces described audio amplitude control signal；Field intensity information is processed and obtains transmitter and broadcast Go out the audio signal of power, amplitude modulation angle value and reception and corresponding audio amplitude value；
S42, according to described broadcast power and the amplitude modulation angle value broadcast monitoring state to transmitter, and Local acousto-optic interlink warning and remote alarms is carried out when transmitter occurs and broadcasts differential mode；
S43, by transmitter receive audio signal be delivered to described sound respectively with corresponding audio amplitude value Frequently monitoring unit and amplitude display unit.
Use the beneficial effect of above-mentioned further scheme: the modulated carrier that can broadcast MW Transmitting Station is believed Number carry out real-time monitoring process, produce audio amplitude control signal according to the amplitude modulation angle value of transmitter；And energy Enough parallel modes combined by wireless collection mode and wired acquisition mode, to medium wave transmitter Broadcast state monitors in real time, and when differential mode occurs broadcasting in medium wave transmitter, carries out warning in time and carry Wake up, thus carry out troubleshooting, it is to avoid medium wave transmitter occurs breaking accident, it is ensured that safe broadcast, additionally it is possible to Carry out remote alarms.
Further, described S41 specifically includes: S411, to gather modulated carrier signal be sampled, Rectification processes with detection, obtains audio-frequency information and the carrier information of transmitter modulation, and according to described sound Frequently information and carrier information calculate the amplitude modulation angle value of transmitter, broadcast power and the sound of transmitter reception Frequently the audio amplitude value that signal is corresponding；
S412, determine the modulation condition of transmitter according to described amplitude modulation angle value and calculate the modulation ratio of correspondence Example value, and when transmitter is in undermodulation state, produce pulse width values relative with undermodulation ratio value The undermodulation audio amplitude control signal answered；When transmitter is in ovennodulation state, produce pulse width It is worth the ovennodulation audio amplitude control signal corresponding with ovennodulation ratio value.
Use the beneficial effect of above-mentioned further scheme: transmitting can be determined according to the amplitude modulation angle value of transmitter The modulation condition of machine also calculates the modulation ratio value of correspondence, and produce pulse width values and modulation ratio value Corresponding undermodulation audio amplitude control signal or ovennodulation audio amplitude control signal, treat broadcast The audio amplitude of audio signal be adjusted.
Accompanying drawing explanation
Fig. 1 is the medium wave transmitter input audio frequency of the embodiment of the present invention one, broadcast state and modulation monitoring System construction drawing；
Fig. 2 is the medium wave transmitter input audio frequency of the embodiment of the present invention one, broadcast state and modulation monitoring The circuit structure diagram of the intelligent handover module in system；
Fig. 3 is the medium wave transmitter input audio frequency of the embodiment of the present invention one, broadcast state and modulation monitoring The structure chart of the wired monitoring processing unit in system；
Fig. 4 is the medium wave transmitter input audio frequency of the embodiment of the present invention two, broadcast state and modulation monitoring Method flow diagram.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with accompanying drawing, example is served only for explaining this Invention, is not intended to limit the scope of the present invention.
Embodiment one, medium wave transmitter input audio frequency, broadcast state and modulation monitoring system.Tie below The system that closing Fig. 1 to Fig. 3 provides the present invention is described in detail.
Seeing Fig. 1 to Fig. 3, the system that the present invention provides includes intelligence handover module, Signal Pretreatment mould Block, electronic sound volume control module and monitor processing module.
Described intelligence handover module, carries out turning for reception is provided with the multipath audio signal of authority order Change process, and obtain the audio amplitude value of each road audio signal according to conversion process and described authority is suitable Sequence, switching output one tunnel audio signal is to described signal pre-processing module.
Concrete, described intelligence handover module specifically include holding wire allocation unit, audio select unit, First singlechip chip, audio switching unit, amplitude display unit and audio alarm unit.
Described holding wire allocation unit, for carrying out the multipath audio signal being provided with authority order received After isolation and Filtering Processing, it is delivered to input and the audio select unit of the first singlechip chip.
Concrete, MW Transmitting Station mainly undertakes the relay task of radio programmes, and its signal source is main It is satellite-signal, fiber-optic signal and microwave signal etc., according to signal quality and reliability by MW Transmitting Station The multipath audio signal setting audio signal authority order received, makees a road audio signal maximum for authority For main road audio signal, other audio signal as standby road audio signal, described main road audio signal Authority is more than the multichannel authority for road audio signal, and multichannel has different power equally for road audio signal Limit, specifically can by multichannel for road audio signal be divided into first for road audio signal, second for road audio signal, 3rd for road audio signal etc., and the rest may be inferred.Described holding wire allocation unit is provided with authority by receive The multipath audio signal of order carries out isolating and Filtering Processing, and isolates and will carry after Filtering Processing Input and audio select unit to the first singlechip chip.
Described audio select unit, for the multipath audio signal sending holding wire allocation unit and monitoring The audio signal that the transmitter that processing module sends receives is monitored.
Described first singlechip chip, specially STC12C5A60S2 chip, for the multichannel sound that will receive Frequently signal carries out A/D respectively and is converted to the audio amplitude value of each road audio signal sending to amplitude and shows Show unit, and determine each road Audio Meter state according to described audio amplitude value.
Concrete, described first singlechip chip receives passing through of described holding wire allocation unit transmission isolates Multipath audio signal after process, and multipath audio signal is carried out full frequency band collection, obtain multichannel sound Frequently the voice signal in persistent period of each road audio signal and each road audio signal in signal The dwell interval time, and according to persistent period of each road audio signal and the dwell interval of voice signal Time, obtain the audio amplitude of each road audio signal.The audio amplitude judging each road audio signal is The no effective audio amplitude standard reaching to set, if described audio amplitude reaches described effective audio amplitude mark Standard, then this audio signal is effective status, and level state corresponding to this audio signal is high level state, Concrete, the audio amplitude in audio signal reaches described effective audio amplitude standard in a flash, this sound Frequently signal is i.e. judged as effective status；If described audio amplitude is all not reaching within the time period set Described effective audio amplitude standard, then this audio signal is disarmed state, and the electricity that this audio signal is corresponding Level state is low level state.
Audio switching unit, for according to described authority order and each road Audio Meter shape State, the road audio signal that switching output authority is maximum and level state is high level, and in institute When stating system malfunctions or power-off, by using, passive impedance transformation is straight-through exports any one road audio frequency Signal, to transmitter, maintains the normal broadcast of transmitter, will not break because system equipment fault causes.
Concrete, it is judged that whether described main road Audio Meter state is high level state, if so, Then intelligence switching exports this main road audio signal, and lights the signal lights that described main road audio signal is corresponding； If it is not, then according to the authority order intelligence switching output authority of standby road audio signal is maximum and level state is One tunnel of high level state is for road audio signal, and lights the signal lights that described standby road audio signal is corresponding. If described main road audio signal is effective status, then unconditional switching exports described main road audio signal, only Have when described main road audio signal is disarmed state, just can switch output standby road audio signal, and be Selecting audio signal in multichannel is for road audio signal is that effective status and authority Gao mono-tunnel are for road Audio signal exports, and the most unconditionally switching output level state is effective status and the high audio frequency of authority Signal.
Amplitude display unit, the audio frequency width of each road audio signal for the first singlechip chip is sent The audio amplitude value of the audio signal that the transmitter that angle value and monitor processing module send receives is with colour bar Form shows on a display screen, convenient observation.
Audio alarm unit, specially sound and light alarm, including alarm and electroluminescent lamp, in multichannel The level state that in audio signal, at least a road audio signal is corresponding is to report to the police during low level.
Concrete, if audio signal Zhong You mono-tunnel or multipath audio signal are invalid described in the multichannel received State, does not has all disarmed states, then carry out audible alarm, and records audio signal and become invalid shape The time of state, remind person on duty to take emergency measures in time, prevent to break accident；If receiving many The all disarmed states of audio signal described in road, then carry out sound and light alarm, and described audio switching unit Being immediately switched to main road audio signal output state, wait that audio signal is recovered, the most a certain road audio frequency is believed Number reverting to effective status, described audio switching unit switches this road audio signal of output immediately, recovers sound Frequently the output of signal.
As in figure 2 it is shown, multipath audio signal is delivered to the first monolithic movement by described holding wire allocation unit The A/D of the P1.0-P1.3 of sheet changes input port, each road audio frequency letter that the first singlechip chip will receive Number carry out A/D conversion with the frequency of 40KHZ, and according to the audio frequency of each road audio signal being converted to Range value judges each road Audio Meter state, the most also the audio frequency width of each road audio signal Angle value exports to described amplitude display unit by P0.1-P0.7 and P2.0-P2.7 delivery outlet, The output of P0.1-P0.7 delivery outlet is audio amplitude Value Data, and the output of P2.0-P2.7 delivery outlet is sound Frequently the address that range value is corresponding.Audio amplitude value corresponding to each road audio signal is within the time period set When (in the most continuous 25 seconds) are all not reaching to effective audio amplitude standard, the first singlechip chip is sentenced This audio signal fixed is disarmed state, and level state corresponding to this audio signal is low level state, and Output signal to described audio alarm unit by P2.6-P2.7 pin report to the police.
Level state that each road audio signal is corresponding and the P1.4-P1.7 output valve of the first singlechip chip it Between relation as follows: (1) as long as described system reset or when starting main road audio signal normal, first The P1.4 foot output high level of singlechip chip, described audio switching unit keeps output main road audio frequency letter Number；(2) when main road audio signal is lost, as long as first is normal for road audio signal, the first monolithic movement The P1.5 foot output high level of sheet, the switching output of described audio switching unit first for road audio signal, Once main road audio signal recovers normal, described audio switching unit unconditional switchback output main road sound immediately Frequently signal；(3) if main road and first is all lost for road audio signal, the P1.6 of the first singlechip chip Foot output high level, the switching output of described audio switching unit second for road audio signal, once main road or Person first recovers normal for road audio signal, and described audio switching unit is according to described authority order, immediately Unconditional switchback output main road or first is for road audio signal；(4) if main road and first, second is for road Audio signal is all lost, the P1.7 foot output high level of the first singlechip chip, described Audio conversion list Unit's switching output the 3rd is for road audio signal, and once main road, first or second are just recovering for road audio signal Often, described audio switching unit according to described authority order, immediately unconditional switchback output main road, first Or second for road audio signal；(5) four tunnel audio signals are all lost, and described audio alarm unit is carried out Sound and light alarm, described audio switching unit switchback main road audio signal output state, waiting signal recovers, The most a certain road audio signal is recovered, and described audio switching unit switches to that of audio signal recovery immediately Road, recovers audio signal output.(6) any road audio signal is lost, and described audio alarm unit is all Audible alarm can be sent, and tracer signal is lost or recovery time.
Described signal pre-processing module, for using dynamic gain to the peak value of the described audio signal received Mode carries out processing makes it maintain in the numerical range of setting, and by defeated for the audio signal after pretreatment Deliver to described electronic sound volume control module.
Concrete, a described signal pre-processing module road audio frequency to the switching output of audio switching unit intelligence Signal carries out pretreatment, i.e. slowly promotes the audio signal that peak value is too low, and too high to peak value Audio signal carries out Fast Compression, prevents the toning that transmitter is caused by the big rise and big fall of audio signal peak System or bad broadcast, uses dynamic gain mode that the peak value of audio signal is maintained at about+10dB.
Described electronic sound volume control module, for the audio amplitude control sent according to described monitor processing module Signal processed carries out audio amplitude regulation to the described audio signal received, and by the audio signal after regulation It is delivered to transmitter to broadcast.
Concrete, described electronic sound volume control module by high-fidelity dual pathways volume control chip (IC) and Second singlechip chip forms, and described second singlechip chip is specially STC12C2052 chip and specifically uses In reducing according to the ovennodulation received or undermodulation audio amplitude control signal correspondence or increasing audio frequency The audio amplitude of signal, until the amplitude modulation angle value of described audio signal is in default normal amplitude modulation angle value In the range of, wherein, described audio amplitude control signal is pulse square wave signal.Described electronic sound volume controls Module can remain and meet transmitter when reducing and increase volume control signal to transmitter offer The audio signal of qualified modulation.It addition, to described electronic sound volume control module input be that Vpp is The audio signal of 10dB, can provide Vpp to be-4dB to+10dB to transmitter after audio amplitude regulation Audio signal, this signal meets the modulation requirement of most of medium wave transmitter of domestic use.
Audio signal after amplitude adjusted can be flowed to main by described electronic sound volume control module respectively Transmitter and standby transmitter, convenient when master transmitter breaks down, use standby transmitter to enter in time The broadcast of row broadcast voice signal, it is ensured that the broadcast of the continuous safe of audio signal.
Concrete, the input of described electronic sound volume control module is specifically divided into volume and reduces input and sound Amount increases input.
If transmitter modulation is in normal modulation state, the most do not carry out any conveying.
If transmitter modulation is in ovennodulation state, then ovennodulation audio amplitude control signal is delivered to Volume reduces input, according to corresponding with the pulse width values of described ovennodulation audio amplitude control signal Amplitude reduce the audio amplitude of audio signal, until peak value amplitude modulation angle value is less than the peak amplitude preset During examination criteria value, stop conveying.Such as, if transmitter modulation is in ovennodulation state, then incited somebody to action Modulating audio frequency amplitude control signal is delivered to volume and reduces input, reduces the amplitude of output audio signal, If the pulse width of ovennodulation audio amplitude control signal is 1s, then the volume of audio signal reduces each second 1dB；If the pulse width of ovennodulation audio amplitude control signal is 2s, then the volume of audio signal is per second Clock reduces 2dB；If the pulse width of ovennodulation audio amplitude control signal is 3s, then the sound of audio signal Measuring and reduce 3dB each second, by that analogy, i.e. the pulse width values of ovennodulation audio amplitude control signal is more Greatly, the amplitude of corresponding audio frequency regulation is the biggest；Until described peak value amplitude modulation angle value is less than described amplitude detection During standard value, stop immediately reducing input conveying ovennodulation audio amplitude control signal to described volume.
If transmitter modulation is in undermodulation state, then undermodulation audio amplitude control signal is delivered to Volume increases input, according to corresponding with the pulse width values of described undermodulation audio amplitude control signal Amplitude increase the audio amplitude of audio signal, until peak value amplitude modulation angle value is more than the peak amplitude preset During standard value, or when average amplitude modulation value is more than the average amplitude standard value preset, stop conveying.Such as, If transmitter modulation is in undermodulation state, then undermodulation audio amplitude control signal is delivered to volume Increase input, increase the amplitude of output audio signal, if the pulse of undermodulation audio amplitude control signal Width is 1s, then the volume of audio signal increases 1dB each second；If undermodulation audio amplitude control signal Pulse width be 2s, then the volume of audio signal increases 2dB each second；If undermodulation audio amplitude control The pulse width of signal processed is 3s, then the volume of audio signal increases 3dB each second, by that analogy, i.e. The pulse width values of undermodulation audio amplitude control signal is the biggest, and the amplitude of corresponding audio frequency regulation is the biggest； During until peak value amplitude modulation angle value is more than described peak amplitude standard value, or average amplitude modulation value is flat more than described All during amplitude criteria value, stop increasing input conveying undermodulation audio amplitude to described volume immediately and control Signal.
Described transmitter receives the audio signal that described electronic sound volume control module sends, and to described audio frequency Signal obtains the carrier signal through ovennodulation after processing, and broadcasts.
Described monitor processing module, for according to transmitter broadcasts what information process obtained The broadcast power of transmitter and amplitude modulation angle value, the broadcast monitoring state to transmitter, and according to institute State amplitude modulation angle value and produce described audio amplitude control signal.
Concrete, described monitor processing module specifically includes wired monitoring processing unit, wireless monitor processes Unit and differential mode alarm unit.
Described wired monitoring processing unit, modulated for what the transmitter gathered by wired mode was broadcasted Carrier signal processes, and obtain transmitter broadcasts the sound that power, amplitude modulation angle value and transmitter receive Frequently the audio amplitude value that signal is corresponding, enters the broadcast state of transmitter with amplitude modulation angle value according to broadcasting power Row monitoring, produces described audio amplitude control signal always according to described amplitude modulation angle value and is delivered to electronic sound volume Control module, and audio amplitude value corresponding to audio signal received by transmitter be delivered to described amplitude and show Show unit.
Described monitor processing module also includes high-frequency signal switching switch, is opened by the switching of described high-frequency signal The modulated carrier signal that the master transmitter worked or standby transmitter broadcast can be delivered to by pass Described wired monitoring processing unit.Master transmitter is when broadcasting modulated carrier signal, and described high-frequency signal is cut Changing switch switching and be connected to described master transmitter, standby transmitter is when broadcasting modulated carrier signal, described High-frequency signal switching switch switching is connected to described standby transmitter.
Concrete, as it is shown on figure 3, described wired monitoring processing unit specifically includes cymoscope, A/D turns Parallel operation, high-speed microprocessor, volume increase square-wave generator and volume reduces square-wave generator.
Described cymoscope is receiving collection by high frequency cable signal and high-frequency signal switching switch After the modulated carrier signal that master transmitter or standby transmitter broadcast, described modulated carrier signal is carried out The monitoring in real time such as sampling, rectification, detection processes, and obtains audio-frequency information and the carrier wave letter of transmitter modulation Breath, described A/D converter calculates the tune of transmitter according to the audio frequency of transmitter modulation and carrier information Range value, broadcast the audio amplitude value that audio signal that performance number and transmitter receive is corresponding, and by it All being delivered to high-speed microprocessor, described high-speed microprocessor calculates the wink of transmitter according to described amplitude modulation angle value Time amplitude modulation angle value, peak value amplitude modulation angle value and preset time period in average am depth value, and according to drawing Peak value amplitude modulation angle value and average am depth value determine the modulation condition of transmitter and calculate correspondence Modulation ratio value, described volume increases square-wave generator or volume reduces square-wave generator according to described tune Ratio value processed produces described audio amplitude control signal, and is delivered to electronic sound volume control module；Described height Speed single-chip microcomputer judges the power rating of transmitter according to the broadcast performance number obtained, and is connect by described transmitter The audio amplitude value that the audio signal of receipts is corresponding is delivered to described amplitude display unit.At described wired monitoring Reason unit also includes coding type keyboard, convenient operation.
Concrete, if described peak value amplitude modulation angle value is more than the amplitude monitoring standard value of regulation, described high speed list Sheet machine then determines that transmitter modulation is in ovennodulation state, calculates ovennodulation ratio value and sends to institute Stating volume and reduce square-wave generator, described volume reduces square-wave generator and produces pulse width values and described mistake The ovennodulation audio amplitude control signal that modulation ratio value is corresponding, and send to the control of described electronic sound volume Module.
If the peak amplitude standard value that described peak value amplitude modulation angle value both less than sets in setting the time period, or The average amplitude standard value that average amplitude modulation value described in person both less than sets in setting the time period, described high speed Single-chip microcomputer then determines that transmitter modulation is in undermodulation state, calculates undermodulation ratio value and sends extremely Described volume increases square-wave generator, and described volume increases square-wave generator and produces pulse width values with described The undermodulation audio amplitude control signal that undermodulation ratio value is corresponding, and send to described electronic sound volume control Molding block.
If described peak value amplitude modulation angle value is in described amplitude monitoring standard value and described peak amplitude standard value Between time, described high-speed microprocessor then determines that transmitter modulation is in normal modulation state, corresponding tune Ratio value processed is zero, and generation pulse width is the low level of zero.
If there is ovennodulation state or undermodulation state, described high-speed microprocessor then determines that transmitter occurs Modulation degree differential mode, and record the time that modulation degree differential mode occurs.
It addition, produce the audio amplitude control signal that pulse width values is corresponding with described modulation ratio value, The audio amplitude of the size and generation that specifically refer to ovennodulation ratio value or undermodulation ratio value controls letter Number the size of pulse width values corresponding, i.e. ovennodulation ratio value or undermodulation ratio value is the biggest, The pulse width values of the audio amplitude control signal produced is the biggest, ovennodulation ratio value or undermodulation ratio Example value the least, the pulse width values of the audio amplitude control signal of generation is the least, if modulation ratio value It is zero, produces the audio amplitude control signal that pulse width is zero, be low level.
Described high-speed microprocessor judges whether described broadcast performance number is less than setting power value, if being less than, then Determine medium wave transmitter emergent power differential mode, and recording power differential mode time of occurrence.Concrete, launching The actual broadcast power of machine be more than its nominal power more than 80%, described high-speed microprocessor judge transmitter as Full power is broadcasted, if the actual broadcast power of transmitter is less than described nominal power less than 80%, described height Speed single-chip microcomputer then judges transmitter emergent power differential mode, and recording power differential mode time of occurrence.
It addition, the broadcast differential mode of medium wave transmitter specifically refer to transmitter broadcast broadcast singal time occur time Between at least two in differential mode, power differential mode and modulation degree differential mode.If medium wave transmitter is broadcasting broadcast In the setting time period of signal, modulation degree differential mode or power differential mode occur, it is determined that medium wave transmitter goes out Differential mode between Xian Shi.Concrete, within 24 hours of medium wave transmitter regulation normal broadcast time, Such as if a transmitter 6:00 in morning starts playing out 22:00 sign-off in evening, this portion is sent out The broadcast " full time " penetrating machine is 16 hours, if medium wave transmitter broadcasts within these 16 hours Doing well is the most all that normal modulation state and full power are broadcasted, the most do not occur modulation degree differential mode and Power differential mode, then judge that the transmitter full time broadcasts, complete broadcast plan, do not have time of occurrence differential mode, Broadcast for " full time "；If within the time period, there is modulation degree differential mode or power differential mode in transmitter, Then judge transmitter time of occurrence differential mode, do not complete broadcast plan.
Described wireless monitor processing unit, for wirelessly gathering the field intensity letter that transmitter is launched Breath processes, and obtains the audio signal broadcasting power, amplitude modulation angle value and reception of transmitter with corresponding Audio amplitude value, the broadcast state of transmitter is supervised with amplitude modulation angle value according to described broadcast power Control, and the audio signal that transmitter receives is delivered to described audio select respectively with corresponding audio amplitude Unit and amplitude display unit.
Concrete, described wireless monitor processing unit uses the mode receiver/transmitter of fixed frequency wireless receiving to send out The field intensity information penetrated, and field intensity information is processed obtain the broadcast power of transmitter, amplitude modulation angle value with And receive audio signal and corresponding audio amplitude value, calculate transmitter according to described amplitude modulation angle value Average am depth value in instantaneous amplitude modulation angle value, peak value amplitude modulation angle value and preset time period, and according to The peak value amplitude modulation angle value gone out and average am depth value determine the modulation condition of transmitter, according to described broadcast Power determines the power rating of transmitter.The judgement of modulation degree differential mode, power differential mode and time differential mode is equal The judgement of described wired monitoring processing unit is identical.In addition it is possible to looked into by keyboard or mouse input Ask order extremely described wireless monitor processing unit, and transmit corresponding tune by RS-232 interface to host computer Range value and power test data.
Differential mode alarm unit, for carry out when transmitter occurs and broadcasts differential mode local acousto-optic interlink warning and Remote alarms.
Concrete, when differential mode occurs broadcasting in described transmitter, described differential mode alarm unit carries out this in time Ground acousto-optic interlink warning, by sound and signal lamp, reminds staff's transmitter to occur broadcasting in time Go out differential mode, take measures in time to carry out troubleshooting, it is to avoid the generation of broadcast accident.It addition, go out at transmitter When now broadcasting differential mode, the content broadcasting differential mode is also sent out by differential mode alarm unit with the form of word or code Deliver to specify mobile terminal, specifically refer to what when occurred is broadcasted differential mode with word or generation The form of code sends to specifying mobile terminal, carries out remote alarms, and remote prompting staff's transmitter goes out Now broadcast differential mode.
Embodiment two, medium wave transmitter input audio frequency, state of broadcasting monitor method with modulation.Tie below The method that closing Fig. 4 provides the present invention is described in detail.
See Fig. 4, S1, intelligence handover module is provided with authority multipath audio signal sequentially and enters reception Row conversion process, and obtain the audio amplitude value of each road audio signal and described power according to conversion process Limit order, switching output one tunnel audio signal is to signal pre-processing module.
Concrete, described step S1 specifically includes following steps:
S11, by receive be provided with authority order multipath audio signal carry out isolation with Filtering Processing after, Carry out A/D respectively and be converted to the audio amplitude value of each road audio signal, and believe according to each road audio frequency Number audio amplitude value determine each road Audio Meter state.
Concrete, the multipath audio signal received is carried out full frequency band collection, obtains in multipath audio signal The dwell interval of the voice signal in the persistent period of each road audio signal and each road audio signal Time, and according to persistent period of each road audio signal and the dwell interval time of voice signal, Audio amplitude to each road audio signal.Judge whether the described audio amplitude of each road audio signal reaches To the effective audio amplitude standard set, if described audio amplitude reaches described effective audio amplitude standard, Then this audio signal is effective status, and level state corresponding to this audio signal is high level state.
S12, according to described authority order and each road Audio Meter state, switching output power The road audio signal that limit is maximum and level state is high level state, and breaking down or during power-off Straight-through any one road audio signal that exports is broadcasted to transmitter.
Concrete, it is judged that whether described main road Audio Meter state is high level, the most then intelligence Switching can export this main road audio signal, and light the signal lights that described main road audio signal is corresponding；If it is not, Then according to the authority order intelligence switching output authority of standby road audio signal is maximum and level state is high electricity One tunnel of level state is for road audio signal, and lights the signal lights that described standby road audio signal is corresponding.If institute Stating main road audio signal is effective status, then unconditional switching exports described main road audio signal, only exists When described main road audio signal is disarmed state, just can switch output standby road audio signal, and be many Road is that effective status and authority Gao mono-tunnel are for road audio frequency for selecting audio signal in the audio signal of road Signal exports, the most unconditionally switching output level state be effective status and authority high audio frequency letter Number.It addition, breaking down or during power-off, the multipath audio signal of reception is led to by intelligence handover module Cross the straight-through output of employing passive impedance transformation to broadcast to described transmitter.
S13, the transmitter that audio amplitude value and the monitor processing module of each road audio signal send is connect The audio amplitude of the audio signal received shows, and an at least road audio frequency letter in multipath audio signal Number corresponding level state is to report to the police during low level.
Concrete, by the transmitter of the audio amplitude value of each road audio signal with monitor processing module transmission The audio amplitude value of the audio signal received shows on a display screen with the form of colour bar, convenient sight Examine.If audio signal Zhong You mono-tunnel or multipath audio signal are disarmed state described in the multichannel received, do not have There are all disarmed states, then carry out audible alarm, and record audio signal and become the time of disarmed state, Remind person on duty to take emergency measures in time, prevent to break accident；If audio frequency described in the multichannel received The all disarmed states of signal, then carry out sound and light alarm, and switch to main road audio signal output state, Wait audio signal is recovered, and the most a certain road audio signal reverts to effective status, switches output the most immediately This road audio signal, recovers the output of audio signal.
S14, to isolation with Filtering Processing after multipath audio signal and monitor processing module send The audio signal that transmitter receives is monitored.
The peak value of S2, the described signal pre-processing module described audio signal to receiving uses dynamic gain side Formula carries out processing makes it maintain in the numerical range of setting, and the audio signal after pretreatment is carried To described electronic sound volume control module.
Concrete, a described signal pre-processing module road audio frequency to the switching output of audio switching unit intelligence Signal carries out pretreatment, i.e. slowly promotes the audio signal that peak value is too low, and too high to peak value Audio signal carries out Fast Compression, prevents the toning that transmitter is caused by the big rise and big fall of audio signal peak System or bad broadcast, uses dynamic gain mode that audio signal peak is maintained at about+10dB.
The audio amplitude control signal docking that S3, electronic sound volume control module send according to monitor processing module The described audio signal received carries out audio amplitude regulation, and is delivered to launch by the audio signal after regulation Machine is to broadcast.
Concrete, reduce according to the ovennodulation received or undermodulation audio amplitude control signal correspondence or Increase the audio amplitude of audio signal, until the amplitude modulation angle value of described audio signal is in default normal tune In the range of range value, wherein, described audio amplitude control signal is pulse square wave signal.Described electronics Audio signal after amplitude adjusted can be flowed to master transmitter and standby by volume control module respectively Transmitter, convenient when master transmitter breaks down, use standby transmitter to carry out broadcast singal in time Broadcast, it is ensured that the broadcast of continuous safe.The input of described electronic sound volume control module is specifically divided into sound Amount reduces input and volume increases input.
Concrete, if transmitter modulation is in normal modulation state, the most do not carry out any conveying.
If transmitter modulation is in ovennodulation state, then ovennodulation audio amplitude control signal is delivered to Volume reduces input, according to corresponding with the pulse width values of described ovennodulation audio amplitude control signal Amplitude reduce the audio amplitude of audio signal, until peak value amplitude modulation angle value is less than the peak amplitude preset During examination criteria value, stop conveying.
If transmitter modulation is in undermodulation state, then undermodulation audio amplitude control signal is delivered to Volume increases input, according to corresponding with the pulse width values of described undermodulation audio amplitude control signal Amplitude increase the audio amplitude of audio signal, until peak value amplitude modulation angle value is more than the peak amplitude preset During standard value, or when average amplitude modulation value is more than the average amplitude standard value preset, stop conveying.
S4, described monitor processing module according to transmitter is broadcasted information process obtain send out Penetrate broadcast power and the amplitude modulation angle value of machine, the broadcast monitoring state to transmitter, and according to described Amplitude modulation angle value produces described audio amplitude control signal.
Concrete, described step S4 specifically includes following steps:
The modulated carrier signal that S41, wired collection transmitter broadcast, wireless collection transmitter is launched simultaneously Field intensity information, modulated carrier signal is processed obtain the broadcast power of transmitter, amplitude modulation angle value with And audio amplitude value corresponding to audio signal received, and produce described audio frequency width according to described amplitude modulation angle value Degree control signal；Field intensity information is processed and obtains the broadcast power of transmitter, amplitude modulation angle value and connect The audio signal received and corresponding audio amplitude value.
Described step S41 specifically includes following steps:
S411, the modulated carrier signal gathered is sampled, rectification and detection process, and obtain transmitter The audio-frequency information of modulation and carrier information, and calculate transmitting according to described audio-frequency information and carrier information The amplitude modulation angle value of machine, broadcast power and audio amplitude value that audio signal that transmitter receives is corresponding；
Concrete, gather, by wired mode, the modulated carrier signal that transmitter broadcasts, to described modulated load The monitorings in real time such as ripple signal is sampled, rectification, detection process, and obtain audio-frequency information and the load of transmitter Ripple information, and the audio-frequency information and carrier information according to transmitter calculate the amplitude modulation angle value of transmitter, broadcast Go out the audio amplitude value that the audio signal of performance number and reception is corresponding, and calculate according to described amplitude modulation angle value Go out the average am depth in the instantaneous amplitude modulation angle value of transmitter, peak value amplitude modulation angle value and preset time period Value.
Use the field intensity information that the mode receiver/transmitter of fixed frequency wireless receiving is launched, and field intensity information is entered Row processes and obtains broadcast power, amplitude modulation angle value and the audio signal of reception of transmitter and corresponding audio frequency Range value, according to described amplitude modulation angle value calculate the instantaneous amplitude modulation angle value of transmitter, peak value amplitude modulation angle value with And the average am depth value in preset time period.
S412, determine the modulation condition of transmitter according to described amplitude modulation angle value and calculate the modulation ratio of correspondence Example value, and when transmitter is in undermodulation state, produce pulse width values relative with undermodulation ratio value The undermodulation audio amplitude control signal answered；When transmitter is in ovennodulation state, produce pulse width It is worth the ovennodulation audio amplitude control signal corresponding with ovennodulation ratio value.
Concrete, calculate the instantaneous amplitude modulation angle value of transmitter, peak value modulation according to described amplitude modulation angle value Average am depth value in value and preset time period, and according to the peak value amplitude modulation angle value drawn and average Amplitude modulation angle value determines the modulation condition of transmitter and calculates the modulation ratio value of correspondence, according to described modulation Ratio value produces described audio amplitude control signal.
If described peak value amplitude modulation angle value is more than the amplitude monitoring standard value of regulation, it is determined that transmitter modulation It is in ovennodulation state, calculates ovennodulation ratio value and produce pulse width values and described ovennodulation ratio It is worth corresponding ovennodulation audio amplitude control signal.
If the peak amplitude standard value that described peak value amplitude modulation angle value both less than sets in setting the time period, or The average amplitude standard value that average amplitude modulation value described in person both less than sets in setting the time period, it is determined that send out The machine modulation of penetrating is in undermodulation state, calculates undermodulation ratio value and produces pulse width values with described The undermodulation audio amplitude control signal that undermodulation ratio value is corresponding.
If described peak value amplitude modulation angle value is in described amplitude monitoring standard value and described peak amplitude standard value Between time, it is determined that transmitter modulation is in normal modulation state, and corresponding modulation ratio value is zero, And generation pulse width is the low level of zero.
If ovennodulation state or undermodulation state occur, it is determined that modulation degree differential mode occurs in transmitter, and Record the time that modulation degree differential mode occurs.
It addition, produce the audio amplitude control signal that pulse width values is corresponding with described modulation ratio value, The audio amplitude of the size and generation that specifically refer to ovennodulation ratio value or undermodulation ratio value controls letter Number the size of pulse width values corresponding, i.e. ovennodulation ratio value or undermodulation ratio value is the biggest, The pulse width values of the audio amplitude control signal produced is the biggest, ovennodulation ratio value or undermodulation ratio Example value the least, the pulse width values of the audio amplitude control signal of generation is the least, if modulation ratio value It is zero, produces the audio amplitude control signal that pulse width is zero, be low level.
Judge whether described broadcast performance number is less than setting power value, if being less than, it is determined that medium wave transmitter Emergent power differential mode, and recording power differential mode time of occurrence.Concrete, in the actual broadcast merit of transmitter Rate is more than its nominal power more than 80%, it is determined that transmitter is that full power is broadcasted, if the actual of transmitter is broadcast Go out power and be less than described nominal power less than 80%, then judge transmitter emergent power differential mode, and record merit Rate differential mode time of occurrence.
S42, according to described broadcast power and the amplitude modulation angle value broadcast monitoring state to transmitter, and Local acousto-optic interlink warning and remote alarms is carried out when transmitter occurs and broadcasts differential mode.
Concrete, the broadcast differential mode of medium wave transmitter specifically refers to transmitter to be occurred when broadcasting broadcast singal At least two in time differential mode, power differential mode and modulation degree differential mode.If medium wave transmitter is broadcasting extensively In the setting time period broadcasting signal, modulation degree differential mode or power differential mode there is, it is determined that medium wave transmitter Time of occurrence differential mode, does not complete broadcast plan；If modulation degree differential mode not occurring in setting the time period And power differential mode, then judge that transmitter " full time " broadcasts, complete broadcast plan.
When differential mode occurs broadcasting in described transmitter, carry out local acousto-optic interlink warning in time, pass through sound And signal lamp, remind staff's transmitter to occur broadcasting differential mode in time, take measures in time to carry out Troubleshooting, it is to avoid the generation of broadcast accident.It addition, when differential mode occurs broadcasting in transmitter, also will broadcast different The content of state sends to specifying mobile terminal with the form of word or code, specifically refers to when What the broadcast differential mode occurred sends to specifying mobile terminal with the form of word or code, carries out remotely Reporting to the police, remote prompting staff's transmitter occurs broadcasting differential mode.
S43, by transmitter receive audio signal be delivered to described sound respectively with corresponding audio amplitude value Frequently monitoring unit and amplitude display unit.
Medium wave transmitter input audio frequency, broadcast state and modulation monitoring system and the side that the present invention provides Method, it is possible to each road audio amplitude value and default authority according to the multipath audio signal received are suitable Sequence, intelligence switching output authority is maximum and signal condition is the audio signal of high level state, and in system Break down or straight-through output audio signal during power-off；And the modulation of transmitter can be monitored in real time Value, and produce corresponding audio amplitude control signal, then according to described audio amplitude control signal pair Audio signal to be broadcasted carries out audio amplitude regulation automatically, and by the audio signal after audio amplitude regulation It is delivered to described transmitter to broadcast, it is ensured that the broadcast quality of audio signal；By wireless collection side The parallel mode that formula and wired acquisition mode combine, modulation degree state, the power to medium wave transmitter State and time state monitor in real time, and occur that modulation degree differential mode, power are different at medium wave transmitter When state or time differential mode, carry out warning reminding in time, thus carry out troubleshooting, it is to avoid medium wave transmitter goes out Now break accident, it is ensured that safe broadcast, it is ensured that the quality of the audio signal of broadcast；Can also carry out remotely Reporting to the police, intelligence is convenient, and practicality is stronger.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all in the present invention Spirit and principle within, any modification, equivalent substitution and improvement etc. made, should be included in this Within bright protection domain.

Claims (10)

1. medium wave transmitter input audio frequency, broadcast state and modulation monitoring system, it is characterised in that Described system includes
Intelligence handover module, signal pre-processing module, electronic sound volume control module and monitor processing module；
Described intelligence handover module, carries out turning for reception is provided with the multipath audio signal of authority order Change process, and obtain the audio amplitude value of each road audio signal according to conversion process and described authority is suitable Sequence, switching output one tunnel audio signal is to described signal pre-processing module；
Described signal pre-processing module, for using dynamic gain to the peak value of the described audio signal received Mode carries out processing makes it maintain in the numerical range of setting, and by defeated for the audio signal after pretreatment Deliver to described electronic sound volume control module；
Described electronic sound volume control module, for the audio amplitude control sent according to described monitor processing module Signal processed carries out audio amplitude regulation to the described audio signal received, and by the audio signal after regulation It is delivered to transmitter to broadcast；
Described monitor processing module, for according to transmitter broadcasts what information process obtained The broadcast power of transmitter and amplitude modulation angle value, the broadcast monitoring state to transmitter, and according to institute State amplitude modulation angle value and produce described audio amplitude control signal.
2. medium wave transmitter input audio frequency as claimed in claim 1, state of broadcasting monitor system with modulation System, it is characterised in that described intelligence handover module specifically includes:
Holding wire allocation unit, for isolating the multipath audio signal being provided with authority order received After Filtering Processing, it is delivered to input and the audio select unit of the first singlechip chip；
Audio select unit, processes with monitoring for the multipath audio signal sending holding wire allocation unit The audio signal that the transmitter that module sends receives is monitored；
First singlechip chip, is converted to often for the multipath audio signal of reception is carried out A/D respectively The audio amplitude value of one tunnel audio signal also sends to amplitude display unit, and according to each road audio signal Audio amplitude value determine each road Audio Meter state；
Audio switching unit, for according to described authority order and each road Audio Meter shape State, the road audio signal that switching output authority is maximum and level state is high level；And in institute When stating system malfunctions or power-off, straight-through any one road audio signal extremely described transmitter that exports is to enter Row broadcasts；
Amplitude display unit, the audio frequency width of each road audio signal for the first singlechip chip is sent The audio amplitude value of the audio signal that the transmitter that angle value and monitor processing module send receives shows；
Audio alarm unit, for the level that at least a road audio signal is corresponding in multipath audio signal State is to report to the police during low level.
3. medium wave transmitter input audio frequency as claimed in claim 1, state of broadcasting monitor system with modulation System, it is characterised in that described electronic sound volume control module include high-fidelity dual pathways volume control chip and Second singlechip chip, specifically for:
Reduce according to the ovennodulation received or undermodulation audio amplitude control signal correspondence or increase sound Frequently the audio amplitude of signal, until the amplitude modulation angle value of described audio signal is in default normal amplitude modulation angle value In the range of, wherein, described audio amplitude control signal is pulse square wave signal.
4. medium wave transmitter input audio frequency as claimed in claim 3, state of broadcasting monitor system with modulation System, it is characterised in that described monitor processing module specifically includes:
Wired monitoring processing unit, for the modulated carrier broadcasting the transmitter gathered by wired mode Signal processes, and the audio signal broadcasting power, amplitude modulation angle value and reception obtaining transmitter is corresponding Audio amplitude value, according to broadcasting power and the amplitude modulation angle value broadcast monitoring state to transmitter, also Produce audio amplitude control signal according to amplitude modulation angle value and be delivered to electronic sound volume control module, and will launch The audio amplitude value that the audio signal of machine reception is corresponding is delivered to amplitude display unit；
Wireless monitor processing unit, for the field intensity information launching the transmitter wirelessly gathered Process, obtain the audio signal broadcasting power, amplitude modulation angle value and reception of transmitter with corresponding Audio amplitude value, according to broadcasting power and the amplitude modulation angle value broadcast monitoring state to transmitter, and will The audio signal that transmitter receives is delivered to audio select unit and width respectively with corresponding audio amplitude value Degree display unit；
Differential mode alarm unit, for carry out when transmitter occurs and broadcasts differential mode local acousto-optic interlink warning and Remote alarms.
5. medium wave transmitter input audio frequency as claimed in claim 4, state of broadcasting monitor system with modulation System, it is characterised in that described wired monitoring processing unit, specifically includes:
Cymoscope, for being sampled the modulated carrier signal gathered, rectification processes with detection, obtains The audio-frequency information of transmitter modulation and carrier information；
A/D converter, for calculating the modulation of transmitter according to described audio-frequency information and carrier information It is worth, broadcasts the audio amplitude value that the audio signal of power and transmitter reception is corresponding；
High-speed microprocessor, for according to described amplitude modulation angle value determine the modulation condition of transmitter and calculate right The modulation ratio value answered, and the power rating of transmitter is determined according to described broadcast power, and by transmitter The audio amplitude value that the audio signal of reception is corresponding sends to amplitude display unit；
Volume increases square-wave generator, for when transmitter is in undermodulation state, produces pulse width It is worth the undermodulation audio amplitude control signal corresponding with undermodulation ratio value；
Volume reduces square-wave generator, for when transmitter is in ovennodulation state, produces pulse width It is worth the ovennodulation audio amplitude control signal corresponding with ovennodulation ratio value.
6. medium wave transmitter input audio frequency, state of broadcasting monitor method with modulation, it is characterised in that Said method comprising the steps of:
S1, intelligence handover module are provided with the multipath audio signal of authority order to reception to be carried out at conversion Reason, and audio amplitude value and the described authority order of each road audio signal is obtained according to conversion process, Switching output one tunnel audio signal is to signal pre-processing module；
The peak value of S2, the described signal pre-processing module described audio signal to receiving uses dynamic gain side Formula carries out processing makes it maintain in the numerical range of setting, and the audio signal after pretreatment is carried To described electronic sound volume control module；
The audio amplitude control signal docking that S3, electronic sound volume control module send according to monitor processing module The described audio signal received carries out audio amplitude regulation, and is delivered to launch by the audio signal after regulation Machine is to broadcast；
S4, described monitor processing module according to transmitter is broadcasted information process obtain send out Penetrate broadcast power and the amplitude modulation angle value of machine, the broadcast monitoring state to transmitter, and according to described Amplitude modulation angle value produces described audio amplitude control signal.
7. medium wave transmitter input audio frequency, state of broadcasting monitor method with modulation as claimed in claim 6, It is characterized in that, described S1 specifically includes:
S11, by receive be provided with authority order multipath audio signal carry out isolation with Filtering Processing after, Carry out A/D respectively and be converted to the audio amplitude value of each road audio signal, and believe according to each road audio frequency Number audio amplitude value determine each road Audio Meter state；
S12, according to described authority order and each road Audio Meter state, switching output power The road audio signal that limit is maximum and level state is high level state, and breaking down or during power-off Straight-through any one road audio signal that exports is broadcasted to transmitter；
S13, the transmitter that audio amplitude value and the monitor processing module of each road audio signal send is connect The audio amplitude value of the audio signal received shows, and an at least road audio frequency in multipath audio signal The level state that signal is corresponding is to report to the police during low level；
S14, to sending out that multipath audio signal and the monitor processing module after isolation and Filtering Processing sends The audio signal that machine of penetrating receives is monitored.
8. medium wave transmitter inputs audio frequency, broadcasts state and modulation monitoring side as claimed in claim 6 Method, it is characterised in that described S3 specifically includes:
Reduce according to the ovennodulation received or undermodulation audio amplitude control signal correspondence or increase sound Frequently the audio amplitude of signal, until the amplitude modulation angle value of described audio signal is in default normal amplitude modulation angle value In the range of, wherein, described audio amplitude control signal is pulse square wave signal.
9. medium wave transmitter inputs audio frequency, broadcasts state and modulation monitoring side as claimed in claim 8 Method, it is characterised in that described S4 specifically includes:
The modulated carrier signal that S41, wired collection transmitter broadcast, wireless collection transmitter is launched simultaneously Field intensity information, modulated carrier signal is processed obtain the broadcast power of transmitter, amplitude modulation angle value with And audio amplitude value corresponding to audio signal received, and produce described audio frequency width according to described amplitude modulation angle value Degree control signal；Field intensity information is processed and obtains the broadcast power of transmitter, amplitude modulation angle value and connect The audio signal received and corresponding audio amplitude value；
S42, according to described broadcast power and the amplitude modulation angle value broadcast monitoring state to transmitter, and Local acousto-optic interlink warning and remote alarms is carried out when transmitter occurs and broadcasts differential mode；
S43, by transmitter receive audio signal be delivered to described sound respectively with corresponding audio amplitude value Frequently monitoring unit and amplitude display unit.
10. medium wave transmitter inputs audio frequency, broadcasts state and modulation monitoring side as claimed in claim 9 Method, it is characterised in that described S41 specifically includes:
S411, the modulated carrier signal gathered is sampled, rectification and detection process, and obtain transmitter The audio-frequency information of modulation and carrier information, and calculate transmitting according to described audio-frequency information and carrier information The amplitude modulation angle value of machine, broadcast power and audio amplitude value that audio signal that transmitter receives is corresponding；
S412, determine the modulation condition of transmitter according to described amplitude modulation angle value and calculate the modulation ratio of correspondence Example value, and when transmitter is in undermodulation state, produce pulse width values relative with undermodulation ratio value The undermodulation audio amplitude control signal answered；When transmitter is in ovennodulation state, produce pulse width It is worth the ovennodulation audio amplitude control signal corresponding with ovennodulation ratio value.
CN201610452194.8A 2016-06-21 2016-06-21 System and method for monitoring input audio, broadcasting state and modulation amplitude of medium-wave transmitter Pending CN105939179A (en)

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Application publication date: 20160914