CN209390022U - Audio-frequency power amplifier and broadcast system - Google Patents
Audio-frequency power amplifier and broadcast system Download PDFInfo
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- CN209390022U CN209390022U CN201920173891.9U CN201920173891U CN209390022U CN 209390022 U CN209390022 U CN 209390022U CN 201920173891 U CN201920173891 U CN 201920173891U CN 209390022 U CN209390022 U CN 209390022U
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Abstract
The utility model discloses a kind of audio-frequency power amplifier and broadcast systems, including main control unit and transmission channel, transmission channel includes decoding unit and selecting unit, and the audio signal input end of decoding unit connects main control unit, receives the audio signal that main control unit is sent；The audio signal output end of decoding unit connects the one of input terminal of selecting unit, another input terminal of selecting unit inputs external audio signal；Output end after the output end connection power amplifier of selecting unit as transmission channel；The selection control terminal of selecting unit connects main control unit, is exported by the signal that an input terminal of main control unit control selections unit inputs by output end.The utility model audio-frequency power amplifier can be applied to digit broadcasting system, the digital audio and video signals that can be issued for digit broadcasting system amplify processing, processing can be amplified for the audio signal of local input simultaneously, have the advantages that easy to control, powerful and connecting line construction is simple.
Description
Technical field
The utility model relates to broadcast technology field, in particular to a kind of audio-frequency power amplifier and broadcast system.
Background technique
With the rapid development being constantly progressive with science and technology in epoch, the functional requirement of modern architecture and original building
There is apparent difference, the high speed development of light current technology is especially built, by electronic technology, mechanics of communication, network technology, calculating
The state-of-the-art technology of the series such as machine technology, automatic control technology, sensor technology introduces, and mentions the service function of building significantly
Height, comprehensive stronger, the field being related to is wider.A component part of the public broadcasting as weak electricity system, be closely connected people
The modern life, music can be played and do service propaganda and paging broadcast, moreover it is possible to as the urgent wide of fire incident
It broadcasts, is a kind of extremely strong broadcast system of uniformity, be widely used in cell, market, hotel, office cell, airport, harbour, station
Equal places are indispensable parts in the modern life and work.
Broadcast product on the market is broadly divided into two major classes at present, and one kind is classified as analog broadcast system, another kind of for number
Broadcast system, that is, network IP broadcast, traditional analog broadcasting product are constituting multiple sound resource broadcasting, multiple functional broadcast system, institute
The structural device product needed is excessively various, and the installation space requirement of system is larger, and user is allowed to use invisible increase
The demand of cost is applied due to needing multiple devices to cross machine connection in the composition of system, causes the audio transmission of system anti-
Interference performance is poor, can not expand more broadcast audio areas, and digit broadcasting system is since it is with powerful expansion capability, because
This uses and increasingly broadcasts.
In current broadcast system, an Audio Matrix host is generally included, is then in control with Audio Matrix host
Peripheral circuit is arranged in the heart, and when to be broadcasted, the audio signal that Audio Matrix host is exported is exported by audio-frequency power amplifier
To external audio equipment, existing audio-frequency power amplifier is mainly made of circuits such as operational amplifiers, can only be directed to audio square
The analog audio signal of battle array host output amplifies processing, when applying it to digit broadcasting system, needs in addition to connect
Analog to digital conversion circuit etc., thus existing audio-frequency power amplifier be applied to broadcast system when, it will lead to broadcast system line
Complicated situation.
In addition, the structure of existing audio-frequency power amplifier is relatively simple, it is merely capable of carrying out for analog audio signal
Enhanced processing, cannot be for the audio signal information enhanced processing of digital audio input.
Utility model content
The first of the utility model the shortcomings that aiming to overcome that the prior art with it is insufficient, a kind of Audio power amplifier is provided
Device, the audio-frequency power amplifier can be applied to digit broadcasting system, can be for the digital audio that digit broadcasting system issues
Signal amplifies processing, while can amplify processing for the audio signal of local input, have the function of it is easy to control,
Powerful and simple connecting line construction advantage.
The second of the utility model is designed to provide a kind of broadcast system.
First purpose of the utility model is achieved through the following technical solutions: a kind of audio-frequency power amplifier, including master control
Unit and transmission channel, transmission channel include decoding unit and selecting unit, and the audio signal input end of decoding unit connects master
Unit is controlled, the audio signal that main control unit is sent is received；The audio signal output end connection selecting unit of decoding unit is wherein
Another input terminal of one input terminal, selecting unit inputs external audio signal；The output end connection power of selecting unit is put
Output end after big device as transmission channel；The selection control terminal of selecting unit connects main control unit, is controlled by main control unit
The signal of the input terminal input of selecting unit is exported by output end.
It preferably, further include microphone, the audio signal input end of microphone is sequentially connected Acquisition Circuit and the 4th difference
Another input terminal of selecting unit is connected after amplifying circuit, another input terminal of selecting unit passes through outside microphone input
Audio signal.
It preferably, further include the first differential amplifier circuit, another input terminal of selecting unit connects the first differential amplification
Another input terminal of the output end of circuit, selecting unit inputs external audio signal by differential amplifier circuit.
It preferably, further include microphone, the first differential amplifier circuit, the second differential amplifier circuit and the 4th differential amplification electricity
Road inputs external audio signal by the input terminal of the first differential amplifier circuit, and the audio signal input end connection of microphone is adopted
Collector, the output end of Acquisition Circuit connect the 4th differential amplifier circuit, the output end of the first differential amplifier circuit and the 4th poor
The output end of the input terminal for dividing the output end of amplifying circuit to be separately connected the second differential amplifier circuit, the second differential amplifier circuit connects
Connect another input terminal of selecting unit.
It preferably, further include third differential amplifier circuit, low-pass filter circuit and the first power amplification circuit；
The left channel audio signal output end and right channel audio signal output end of decoding unit are separately connected third difference
The input terminal of amplifying circuit, the output end of third differential amplifier circuit are sequentially connected low-pass filter circuit and the first power amplification electricity
One of input terminal of selecting unit is connected behind road.
It preferably, further include active-standby switch circuit, active-standby switch circuit includes the first relay；First relay includes two
Kind contact, respectively first group of contact and second group of contact, first group of contact include the first normally closed stationary contact, the first normally opened stationary contact
Point and the first movable contact, second group of contact include the second normally closed stationary contact, the second normally opened stationary contact and the second movable contact；First after
The control terminal of electric appliance connects main control unit, controls the first movable contact by main control unit and connects the first normally closed stationary contact or first often
Stationary contact is opened, the second movable contact is controlled by main control unit and connects the second normally closed stationary contact or the second normally opened stationary contact；
It is directed to each transmission channel, the first normally closed stationary contact connects selecting unit in the transmission channel in the first relay
The audio of the audio output for the power amplifier that output end is connected, the first normally opened stationary contact connection non-firm power amplifier is defeated
Outlet；The audio that first normally closed stationary contact connects the power amplifier that selecting unit output end is connected in the transmission channel is public
Output end, the audio public output of the second normally closed stationary contact connection non-firm power amplifier, the first movable contact and the second dynamic touching
Resistance, the output end of the first movable contact and the second movable contact as the transmission channel are connected between point；
It is directed to each transmission channel, non-firm power amplifier is that in the transmission channel in addition selecting unit output end connects again
Other power amplifiers for connecing are company, selecting unit output end institute in other transmission channels spare as the transmission channel
The power amplifier connect.
It further, further include power amplifier fault detection circuit, the power amplifier fault detection circuit
The output end of power amplifier that input terminal connection selecting unit output end is connected, power amplifier fault detection circuit it is defeated
Outlet connects main control unit, and main control unit is exported according to the signal determining selecting unit that power amplifier fault detection circuit is sent
Hold whether connected power amplifier breaks down.
It preferably, further include that 24V cuts by force circuit module, three-wire system and cuts circuit module and external equipment trigger circuit by force；
It includes the second relay that 24V, which cuts by force circuit module, and the second relay includes that the normally closed stationary contact of third, third are normally opened quiet
Contact and third movable contact；Wherein the control terminal of the second relay connects main control unit, controls the dynamic touching of third by main control unit
The normally closed stationary contact of point connection third or the normally opened stationary contact of third, the normally closed stationary contact ground connection of third, third normally opened contact connect 24V electricity
Source；24V cuts by force circuit module and cuts equipment by force by the external 24V power supply power supply of third movable contact connection；
It includes third relay that three-wire system, which cuts by force circuit module, third relay include the 4th normally closed stationary contact, the 4th often
Open stationary contact and the 4th movable contact；Wherein the control terminal of third relay connects main control unit, passes through main control unit control the 4th
Movable contact connects the 4th normally closed stationary contact or the 4th normally opened stationary contact；Three-wire system cuts by force circuit module and passes through the 4th normally closed stationary contact
The common end COM for connecting external subwoofer contact sound volume controller connects external subwoofer device voice volume by the 4th normally opened stationary contact
The hot end of controller connects the urgent end of external subwoofer contact sound volume controller by the 4th movable contact；
External equipment trigger circuit includes the first photoelectrical coupler and the 5th relay；The input terminal of first photoelectrical coupler
As external signal triggering end, outer triggering signal is received；The output of first photoelectrical coupler terminates main control unit；5th relay
Device includes the 5th normally closed stationary contact, the 5th normally opened stationary contact and the 5th movable contact；Wherein the control terminal of the 6th relay connects master
Unit is controlled, the 5th movable contact is controlled by main control unit and connects the 5th normally closed stationary contact or the 5th normally opened stationary contact；5th relay
In device, external equipment trigger circuit is linked into the control loop of external equipment by the 5th normally opened stationary contact and the 5th movable contact
In, for connecting the control loop of external equipment.
It preferably, further include internet communication module, main control unit is linked into internet by internet communication module, leads to
Internet is crossed to be communicated with the host computer in broadcast system.
Second purpose of the utility model is achieved through the following technical solutions: a kind of broadcast system, including the utility model
Audio-frequency power amplifier described in first purpose.
The utility model compared with the existing technology have following advantages and effects
(1) in the utility model audio-frequency power amplifier, including main control unit and transmission channel, transmission channel include decoding
The audio signal input end of unit and selecting unit, decoding unit connects main control unit, receives the audio letter that main control unit is sent
Number；One of input terminal of the audio signal output end connection selecting unit of decoding unit, another input of selecting unit
End input external audio signal；Output end after the output end connection power amplification circuit of selecting unit as transmission channel；Choosing
Select the selection control terminal connection main control unit of unit, the signal inputted by an input terminal of main control unit control selections unit
It is exported by output end.In the present invention, main control unit can receive the digital audio and video signals of broadcast system transmission, then
It is sent to after decoding unit is decoded that enhanced processing is output to outside again, it can be seen that, the utility model being capable of digital broadcasting
The digital audio and video signals that system issues amplify processing.In addition, in the utility model, control of the selecting unit in main control unit
Under, it can choose the audio signal of input external audio signal output, be output to outside after processing is amplified to it, there is control
Make convenient, powerful and simple connecting line construction advantage.
(2) in the utility model audio-frequency power amplifier, it is additionally provided with microphone, wherein the audio signal input of microphone
End connects another input terminal of selecting unit by Acquisition Circuit, another input terminal of selecting unit passes through microphone input
External audio signal, the audio signal of microphone input can be by can after power amplification circuit that selecting unit output end connects
Directly to export, therefore the utility model audio-frequency power amplifier can be used directly as microphone, further expand sound
The use function of frequency power amplifier.
(3) in the utility model audio-frequency power amplifier, can be set the first differential amplifier circuit, selecting unit it is another
A input terminal connects the output end of the first differential amplifier circuit, another input terminal of selecting unit is defeated by differential amplifier circuit
Enter external audio signal, it is in the present invention, available to outside audio-frequency power amplifier by the first differential amplifier circuit
The audio signal of portion's source of sound output, then by being exported after the power amplifier enhanced processing of selecting unit output end, because
This utility model audio-frequency power amplifier can amplify processing for the audio signal of local external sound source output, side
Just the broadcasting of local audio signal is carried out.
(4) in the utility model audio-frequency power amplifier, microphone, the first differential amplifier circuit and can be set simultaneously
Two differential amplifier circuits input external audio signal, the audio signal of microphone by the input terminal of the first differential amplifier circuit
Input terminal connects Acquisition Circuit, and the output end of the first differential amplifier circuit and the output end of Acquisition Circuit are separately connected the second difference
The input terminal of amplifying circuit, another input terminal of the output end connection selecting unit of the second differential amplifier circuit.It is practical at this
In novel, selecting unit can select the audio of amplification the second differential amplifier circuit input to believe by the second differential amplifier circuit
Number, which is that the audio signal of microphone input and the audio signal of other external sound sources input carry out the sound after audio mixing
Frequency signal, therefore the utility model audio-frequency power amplifier is integrated with function, the simple advantage of circuit structure.
(5) active-standby switch circuit, in the present invention, master control are additionally provided in the utility model audio-frequency power amplifier
Unit controls the working condition of active-standby switch circuit, so that the audio signal of selecting unit output end output passes through power amplifier
Or non-firm power amplifier output.In addition, being additionally provided with power amplifier fault detection circuit in audio-frequency power amplifier, lead to
Overpower amplifier failures detection circuit detects and selects whether the power amplifier that unit output end is connected breaks down, in function
When rate amplifier breaks down, main control unit passes through the working condition of control active-standby switch circuit, so that selecting unit output
Audio signal is exported by non-firm power amplifier.From the foregoing, it can be seen that the utility model audio-frequency power amplifier has internal function
The fault detection capability of rate amplifier is detecting that power amplifier when something goes wrong, can choose and amplified using non-firm power
Device, therefore, the utility model audio-frequency power amplifier have the function of fault self-checking, while can ensure the function that audio plays.
(6) in the utility model audio-frequency power amplifier, included 24V cuts by force circuit module and three-wire system and cuts circuit mould by force
Block, 24V cut by force the strong of the external 24V power supply power supply of circuit module connection and cut equipment；When there is fire alarm, 24V power supply can control
Power supply cuts equipment and obtains the power supply of 24V by force, for fighting fire dangerous situation.It is external to cut circuit module connection by force by three-wire system
Stereo set volume controller can cut by force circuit module control external audio equipment sound when there is fire alarm by three-wire system
Amount controller is opened, and the volume of audio signal of the broadcasting of external audio equipment is enabled to adjust maximum, is avoided because outer
The case where portion's stereo set volume is turned down or is closed and do not receive fire broadcast by user.
It (7) further include external equipment trigger circuit in the utility model audio-frequency power amplifier；External trigger circuit it is defeated
The external triggers equipment such as external timer can be connect by entering end, when external equipment trigger circuit receives the transmission of external trigger equipment
When trigger signal, the control loop conducting for the external equipment that external equipment trigger circuit is connected can control, so that control is outer
The work of portion's equipment.
(8) in the utility model audio-frequency power amplifier, including internet communication module, main control unit can pass through interconnection
Net communication module is linked into internet, is communicated by internet with the host computer in broadcast system, such as cloud server,
Audio-frequency power amplifier is by the available audio signal issued to cloud server of internet communication module, thus to cloud
The audio signal that server issues amplifies processing, and the utility model is communicated by internet with broadcast system host computer
Mode, can be convenient the extension of each audio zone audio-frequency power amplifier in broadcast system.
Detailed description of the invention
Fig. 1 is the utility model audio-frequency power amplifier structure principle chart.
Fig. 2 a is the main control unit MCU circuit diagram of the utility model audio-frequency power amplifier.
Fig. 2 b is VS1053 decoding chip and decoded output end in the utility model audio-frequency power amplifier transmission channel
The circuit diagram of parallel circuit.
Fig. 2 c is the circuit diagram of selecting unit part in the utility model audio-frequency power amplifier transmission channel.
Fig. 2 d is the connected electricity of another input terminal of selecting unit in the utility model audio-frequency power amplifier transmission channel
The schematic diagram on road.
Fig. 3 is the circuit diagram of active-standby switch circuit in the utility model audio-frequency power amplifier.
Fig. 4 is the circuit diagram that 24V cuts by force circuit module in the utility model audio-frequency power amplifier.
Fig. 5 is the circuit diagram that three-wire system cuts by force circuit module in the utility model audio-frequency power amplifier.
Fig. 6 is the circuit diagram of external equipment trigger circuit in the utility model audio-frequency power amplifier.
Specific embodiment
The present invention will be further described in detail with reference to the embodiments and the accompanying drawings, but the implementation of the utility model
Mode is without being limited thereto.
Embodiment
Present embodiment discloses a kind of audio-frequency power amplifiers, as described in Figure 1, including main control unit and transmission channel, it passes
Defeated channel includes decoding unit and selecting unit, and the audio signal input end of decoding unit connects main control unit, receives master control list
The audio signal that member is sent；One of input terminal of the audio signal output end connection selecting unit of decoding unit, selection are single
Another input terminal of member inputs external audio signal；It is logical as transmission after the output end connection power amplification circuit of selecting unit
The output end in road；The selection control terminal of selecting unit connects main control unit, defeated by one of main control unit control selections unit
The signal for entering end input is exported by output end.
In the present embodiment, the number of transmission channel can be one or more, when to be multiple, in each transmission channel
It include decoding unit and selecting unit.
In the present embodiment, audio-frequency power amplifier is network audio power amplifier, and main control unit is connected with internet
Communication module, main control unit are linked into internet by internet communication module, can pass through the upper of internet and broadcast system
Position machine communication, wherein host computer can be cloud server.Internet communication module can be ethernet interface module, Ethernet
Interface module is mainly made of ethernet PHY chip DP83848VYB and network transformer.In the present embodiment, main control unit
After accessing internet, the audio signal that host computer is sent in broadcast system, control signal etc. can receive.
In the present embodiment, the circuit diagram in input channel can be specific as follows as shown in Fig. 2 a to 2d:
In the present embodiment, microphone or the first differential amplifier circuit, the audio signal input of microphone can be set
End connects another input terminal of selecting unit by Acquisition Circuit, another input terminal of selecting unit passes through microphone input
External audio signal.Alternatively, another input terminal of selecting unit connects the output end of the first differential amplifier circuit, selecting unit
Another input terminal external audio signal is inputted by differential amplifier circuit.In the present embodiment, as illustrated in figures 2 c and 2d, it selects
Another input terminal for selecting unit can also pass through the second differential amplifier circuit 2 while connect 11 output end of microphone Acquisition Circuit
The 4th differential amplifier circuit 12 and the first differential amplifier circuit 1 output, at this point, defeated by the first differential amplifier circuit 1
Enter end input external audio signal, the input terminal of the first differential amplifier circuit 1 can connect external sound source, the audio letter of microphone
Number input terminal connects Acquisition Circuit, and the output end of Acquisition Circuit connects the 4th differential amplifier circuit 12, the first differential amplifier circuit
Output end and the output end of the 4th differential amplifier circuit be separately connected the input terminal of the second differential amplifier circuit, the second difference is put
Another input terminal of the output end connection selecting unit of big circuit.In this case, selecting unit can pass through the second difference
The audio signal of amplifying circuit selection amplification the second differential amplifier circuit input, the audio signal are that the audio of microphone input is believed
Number and external sound source input audio signal audio mixing.In the present embodiment, as shown in Figure 2 d, it is arranged in audio-frequency power amplifier
There is lotus flower joint terminal, the pin 1 and pin 2 of lotus flower terminal are separately connected the first differential amplifier circuit, and the pin 3 of lotus flower terminal connects
Ground, audio-frequency power amplifier connect external sound source by lotus flower terminal, respectively correspond input by lotus flower terminal pins 1 and pin 2
The left channel audio signal and right channel audio signal of external sound source output.
In the present embodiment, as shown in Figure 2 d, the Acquisition Circuit 11 of microphone includes resistance R112, resistance R114 and resistance
R117, wherein the left channel audio input terminal of microphone and right audio channel input terminal are connected respectively resistance R114 and resistance
The other end of one end of R117, resistance R114 and resistance R117 are all connected with one end of resistance R112, and the end of resistance R112 passes through
The other end of electrolytic capacitor E18 ground connection, resistance R112 connects DC power supply.The left channel audio input terminal of microphone passes through capacitor
C99 ground connection, while the 4th differential amplifier circuit 12 is connected after being sequentially connected electrolytic capacitor C38 and resistance R121.
In the present embodiment, third differential amplifier circuit 3, low-pass filtering electricity are provided between decoding unit and selecting unit
Road 4 and the first power amplification circuit 5；The left channel audio signal output end and right channel audio signal output end of decoding unit point
Not Lian Jie third differential amplifier circuit 3 input terminal, the output end of third differential amplifier circuit 3 is sequentially connected low-pass filter circuit
4 and first connect selecting unit after power amplification circuit 5 one of input terminal.In the present embodiment, as shown in Figure 2 b, decoding
Unit can be the decoding function part by VS1053 codec chip to realize, main control unit can use MCU, specifically can be with
Use chip STM32F407VGT6 as shown in Figure 2 a；The IO of the data input and output pin connection MCU of VS1053 codec chip
Port；The left channel audio signal decoded output LEFT of VS1053 codec chip believes as the left channel audio of decoding unit
Number decoded output, for exporting left channel audio signal decoded signal, the right channel audio signal of VS1053 codec chip
Right channel audio signal decoded output of the decoded output RIGHT as decoding unit, for exporting right channel audio signal
Decoded signal.In the present embodiment, as shown in Figure 2 b, the left channel audio signal decoded output of VS1053 codec chip
LEFT is sequentially connected the inverting input terminal of connection 3 operational amplifier of third differential amplifier circuit after capacitor C200 and resistance R310,
The right channel audio signal decoded output RIGHT of VS1053 codec chip connects after being sequentially connected capacitor C197 and resistance R31
Connect the inverting input terminal of 3 operational amplifier U29A of third differential amplifier circuit, the audio output buffer of VS1053 codec chip
The normal phase input end of 3 operational amplifier U29A of GBUF connection third differential amplifier circuit is held, 3 operation of third differential amplifier circuit is put
Big device U29A inverting input terminal connects output end, three differential amplifier circuits, 3 operation with resistance R309 by capacitor C198 in parallel
The normal phase input end of amplifier U29A is grounded by capacitor C46.
In the present embodiment, the selector that the selecting unit in each transmission channel can select 1 for 2, selector include selection
Control terminal, first input end, the second input terminal and output end；The selection control unit of selector connects main control unit, passes through master
The signal of the signal or the input of the second input terminal of controlling unit control first input end input is exported by output end；In embodiment
In, when there are multiple transmission channels, the selector of multichannel can also be selected, such as shown in Figure 2 b, selector can use
Selecting unit of HEF4053, multiple selector Zhong Ge the road selecting unit respectively as each transmission channel of audio-frequency power amplifier, choosing
The control terminal connection main control unit for selecting device, the output of each road selecting unit is controlled by main control unit.It is as shown in Figure 2 b to work as sound
Circuit when frequency power amplifier includes 2 defeated place channels, wherein the first via selecting unit of HEF4053 is as one of transmission
The selecting unit in channel, selecting unit of the second tunnel selecting unit as another transmission channel.
In the present embodiment, audio-frequency power amplifier further includes active-standby switch circuit, as shown in figure 3, active-standby switch circuit
Including the first relay 6；First relay 6 includes two kinds of contacts, respectively first group of contact and second group of contact, first group of touching
Point includes the first normally closed stationary contact, the first normally opened stationary contact and the first movable contact, second group of contact include the second normally closed stationary contact,
Second normally opened stationary contact and the second movable contact；The control terminal of first relay connects main control unit, passes through main control unit control the
One movable contact connects the first normally closed stationary contact or the first normally opened stationary contact, controls the second movable contact connection second by main control unit
Normally closed stationary contact or the second normally opened stationary contact；
It is directed to each transmission channel, the first normally closed stationary contact connects selecting unit in the transmission channel in the first relay
The audio of the audio output for the power amplifier that output end is connected, the first normally opened stationary contact connection non-firm power amplifier is defeated
Outlet；The audio that first normally closed stationary contact connects the power amplifier that selecting unit output end is connected in the transmission channel is public
Output end, the audio public output of the second normally closed stationary contact connection non-firm power amplifier, the first movable contact and the second dynamic touching
Resistance, the output end of the first movable contact and the second movable contact as the transmission channel are connected between point；
It is directed to each transmission channel, non-firm power amplifier is that in the transmission channel in addition selecting unit output end reconnects
Other power amplifiers or connected by selecting unit output end in other transmission channels spare as the transmission channel
Power amplifier.When non-firm power amplifier is in addition other power amplifications that transmission channel selecting unit output end reconnects
When device, a non-firm power amplifier can connect selecting unit output end in multiple transmission channels simultaneously, as multiple transmission
The spare power amplifier of channel selection unit.
In the present embodiment, it is directed to each transmission channel, one or more spare biographies can be configured to the transmission channel
Defeated channel；The power amplifier that selecting unit output end is connected in standby transport channel is as non-firm power amplifier.
In the present embodiment, further include power amplifier fault detection circuit, power amplifier fault detection circuit it is defeated
Enter the output end for the power amplifier that end connection selecting unit output end is connected, the output of power amplifier fault detection circuit
End connection main control unit, the signal determining selecting unit output end that main control unit is sent according to power amplifier fault detection circuit
Whether the power amplifier connected breaks down.In the present embodiment, amplifier failures detection circuit can pass through photoelectricity coupling
Clutch realizes that the input terminal of photoelectrical coupler connects the output end for the power amplifier that selecting unit output end is connected, photoelectricity
The output end of coupler connects main control unit, when the output end for the power amplifier that selecting unit output end is connected has signal defeated
When out, the output end of photoelectrical coupler will send corresponding level signal to main control unit, and main control unit can be according to from photoelectricity
Whether the power amplifier that the level signal received in coupler determines that selecting unit output end is connected breaks down.
In the present embodiment, by active-standby switch circuit and power amplifier fault detection circuit may be implemented fault detection with
And the switching of active and standby power amplifier, concrete principle are as follows:
When the host computer in broadcast system sends audio signal to main control unit, main control unit is according to the order of host computer
Audio signal is sent to the corresponding transmission channel of audio-frequency power amplifier, decoding unit solution of the audio signal Jing Guo transmission channel
External audio equipment is output to after amplifying processing by the power amplifier that selecting unit output end connects after code.Power is put
Whether the power amplifier that big device fault detection circuit detects and selects the connection of unit output end breaks down, when a failure occurs,
Main control unit controls the working condition of the first relay in active-standby switch circuit, so that the first normally opened stationary contact of the first relay
Point and the second normally opened stationary contact are connected respectively the first movable contact and the second movable contact, so that selecting unit output end is defeated
Signal out is exported by non-firm power amplifier.In the present embodiment, when non-firm power amplifier is spare transmission
When the power amplifier that channel selection unit output end is connected, main control unit can be by the information of power amplifier failure
The host computer in broadcast system is fed back to, the host computer in broadcast system reconfigures to audio function for its audio signal sent
The spare transmission channel of rate amplifier, it is defeated that audio signal is sent to selecting unit in spare transmission channel by main control unit control
The power amplifier that outlet is connected is exported by the power amplifier.When non-firm power amplifier is that transmission channel is another
When the power amplifier of outer connection, the audio signal of transmission channel output is directly output to non-firm power amplifier and is exported.
In the present embodiment, audio-frequency power amplifier further includes that 24V cuts by force circuit module, three-wire system cuts by force circuit module
With external signal triggering end.
In the present embodiment, as shown in figure 4, it includes the second relay 13 that 24V, which cuts by force circuit module, third relay 13 includes
The normally closed stationary contact of third, the normally opened stationary contact of third and third movable contact；Wherein the control terminal of third relay connects main control unit,
The normally closed stationary contact of third movable contact connection third is controlled by main control unit or the normally opened stationary contact of third, the normally closed stationary contact of third connect
Ground, third normally opened contact connect 24V power supply；24V cuts by force circuit module and connects the strong of external 24V power supply power supply by third movable contact
Cut equipment；
In the present embodiment, as shown in figure 5, it includes third relay 14, the 4th relay 14 that three-wire system, which cuts by force circuit module,
Including the 4th normally closed stationary contact, the 4th normally opened stationary contact and the 4th movable contact；Wherein the control terminal of the 4th relay connects master control
Unit controls the 4th movable contact by main control unit and connects the 4th normally closed stationary contact or the 4th normally opened stationary contact；Three-wire system is cut by force
Circuit module connects the common end COM of external subwoofer contact sound volume controller by the 4th normally closed stationary contact, normally opened by the 4th
Stationary contact connects the hot end of external subwoofer contact sound volume controller, connects the control of external subwoofer device voice volume by the 4th movable contact
The urgent end of device.
In the present embodiment, as shown in fig. 6, external equipment trigger circuit includes the second photoelectrical coupler and the 4th relay
15；The input terminal of second photoelectrical coupler receives outer triggering signal as external signal triggering end；Second photoelectrical coupler
Output termination main control unit；4th relay includes the 5th normally closed stationary contact, the 5th normally opened stationary contact and the 5th movable contact；Wherein
The control terminal of 6th relay connects main control unit, by main control unit control the 5th movable contact connect the 5th normally closed stationary contact or
5th normally opened stationary contact；In 4th relay, external equipment trigger circuit is connect by the 5th normally opened stationary contact and the 5th movable contact
Enter into the control loop of external equipment, for connecting the control loop of external equipment.
The present embodiment also discloses a kind of broadcast system, including the present embodiment audio-frequency power amplifier described above.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by above-mentioned
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (10)
1. a kind of audio-frequency power amplifier, which is characterized in that including main control unit and transmission channel, transmission channel includes that decoding is single
The audio signal input end of member and selecting unit, decoding unit connects main control unit, receives the audio signal that main control unit is sent；
One of input terminal of the audio signal output end connection selecting unit of decoding unit, another input terminal of selecting unit are defeated
Enter external audio signal；Output end after the output end connection power amplifier of selecting unit as transmission channel；Selecting unit
Selection control terminal connect main control unit, passed through by the signal that an input terminal of main control unit control selections unit inputs defeated
Outlet output.
2. audio-frequency power amplifier according to claim 1, which is characterized in that further include microphone, the audio of microphone
Signal input part is sequentially connected another input terminal of connection selecting unit after Acquisition Circuit and the 4th differential amplifier circuit, selection
Another input terminal of unit passes through microphone input external audio signal.
3. audio-frequency power amplifier according to claim 1, which is characterized in that it further include the first differential amplifier circuit, choosing
Another input terminal for selecting unit connects the output end of the first differential amplifier circuit, another input terminal of selecting unit passes through difference
Amplifying circuit is divided to input external audio signal.
4. audio-frequency power amplifier according to claim 1, which is characterized in that further include microphone, the first differential amplification
Circuit, the second differential amplifier circuit and the 4th differential amplifier circuit are inputted external by the input terminal of the first differential amplifier circuit
Audio signal, the audio signal input end of microphone connect Acquisition Circuit, and the output end of Acquisition Circuit connects the 4th differential amplification
The output end of circuit, the output end of the first differential amplifier circuit and the 4th differential amplifier circuit is separately connected the second differential amplification electricity
The input terminal on road, another input terminal of the output end connection selecting unit of the second differential amplifier circuit.
5. audio-frequency power amplifier according to claim 1, which is characterized in that further include third differential amplifier circuit, low
Bandpass filter circuit and the first power amplification circuit；
The left channel audio signal output end and right channel audio signal output end of decoding unit are separately connected third differential amplification
The input terminal of circuit, after the output end of third differential amplifier circuit is sequentially connected low-pass filter circuit and the first power amplification circuit
Connect one of input terminal of selecting unit.
6. audio-frequency power amplifier according to claim 1, which is characterized in that it further include active-standby switch circuit, it is active and standby to cut
Changing circuit includes the first relay；First relay include two kinds of contacts, respectively first group of contact and second group of contact, first
Group contact includes the first normally closed stationary contact, the first normally opened stationary contact and the first movable contact, and second group of contact includes second normally closed quiet
Contact, the second normally opened stationary contact and the second movable contact；The control terminal of first relay connects main control unit, passes through main control unit control
It makes the first movable contact and connects the first normally closed stationary contact or the first normally opened stationary contact, the connection of the second movable contact is controlled by main control unit
Second normally closed stationary contact or the second normally opened stationary contact；
It is directed to each transmission channel, the first normally closed stationary contact connects selecting unit in the transmission channel and exports in the first relay
Hold the audio output of connected power amplifier, the audio output of the first normally opened stationary contact connection non-firm power amplifier
End；The audio that first normally closed stationary contact connects the power amplifier that selecting unit output end is connected in the transmission channel is public defeated
Outlet, the audio public output of the second normally closed stationary contact connection non-firm power amplifier, the first movable contact and the second movable contact
Between be connected with resistance, the output end of the first movable contact and the second movable contact as the transmission channel；
It is directed to each transmission channel, non-firm power amplifier is that in the transmission channel in addition selecting unit output end reconnects
Other power amplifiers are connected for selecting unit output end in other transmission channels spare as the transmission channel
Power amplifier.
7. audio-frequency power amplifier according to claim 6, which is characterized in that further include power amplifier fault detection electricity
Road, the input terminal of the power amplifier fault detection circuit connect the defeated of the power amplifier that selecting unit output end is connected
Outlet, the output end of power amplifier fault detection circuit connect main control unit, and main control unit is examined according to power amplifier failure
Whether the power amplifier that the signal determining selecting unit output end that slowdown monitoring circuit is sent is connected breaks down.
8. audio-frequency power amplifier according to claim 1, which is characterized in that further include that 24V cuts by force circuit module, three lines
System cuts by force circuit module and external equipment trigger circuit；
It includes the second relay that 24V, which cuts by force circuit module, and the second relay includes the normally closed stationary contact of third, the normally opened stationary contact of third
With third movable contact；Wherein the control terminal of the second relay connects main control unit, controls third movable contact by main control unit and connects
The normally closed stationary contact of third or the normally opened stationary contact of third, the normally closed stationary contact ground connection of third are connect, third normally opened contact connects 24V power supply；24V
Circuit module is cut by force, and equipment is cut by force by the external 24V power supply power supply of third movable contact connection；
It includes third relay that three-wire system, which cuts by force circuit module, and third relay includes the 4th normally closed stationary contact, the 4th normally opened quiet
Contact and the 4th movable contact；Wherein the control terminal of third relay connects main control unit, passes through the dynamic touching of main control unit control the 4th
Point the 4th normally closed stationary contact of connection or the 4th normally opened stationary contact；Three-wire system cuts by force circuit module and passes through the 4th normally closed stationary contact connection
The common end COM of external subwoofer contact sound volume controller connects the control of external subwoofer device voice volume by the 4th normally opened stationary contact
The hot end of device connects the urgent end of external subwoofer contact sound volume controller by the 4th movable contact；
External equipment trigger circuit includes the first photoelectrical coupler and the 5th relay；The input terminal conduct of first photoelectrical coupler
External signal triggering end receives outer triggering signal；The output of first photoelectrical coupler terminates main control unit；5th relay packet
Include the 5th normally closed stationary contact, the 5th normally opened stationary contact and the 5th movable contact；Wherein the control terminal of the 6th relay connects master control list
Member controls the 5th movable contact by main control unit and connects the 5th normally closed stationary contact or the 5th normally opened stationary contact；In 5th relay,
External equipment trigger circuit is linked into the control loop of external equipment by the 5th normally opened stationary contact and the 5th movable contact, is used for
Connect the control loop of external equipment.
9. audio-frequency power amplifier according to claim 1, which is characterized in that further include internet communication module, master control
Unit is linked into internet by internet communication module, is communicated by internet with the host computer in broadcast system.
10. a kind of broadcast system, which is characterized in that including audio-frequency power amplifier described in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920173891.9U CN209390022U (en) | 2019-01-31 | 2019-01-31 | Audio-frequency power amplifier and broadcast system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920173891.9U CN209390022U (en) | 2019-01-31 | 2019-01-31 | Audio-frequency power amplifier and broadcast system |
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| CN209390022U true CN209390022U (en) | 2019-09-13 |
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ID=67854136
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| CN201920173891.9U Active CN209390022U (en) | 2019-01-31 | 2019-01-31 | Audio-frequency power amplifier and broadcast system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112383285A (en) * | 2019-11-21 | 2021-02-19 | 北京城建设计发展集团股份有限公司 | Integrated digital power amplifier |
| CN113315479A (en) * | 2021-05-28 | 2021-08-27 | 广州德勤龙健电子有限公司 | Main/standby switching device and method for audio power amplifier |
-
2019
- 2019-01-31 CN CN201920173891.9U patent/CN209390022U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112383285A (en) * | 2019-11-21 | 2021-02-19 | 北京城建设计发展集团股份有限公司 | Integrated digital power amplifier |
| CN113315479A (en) * | 2021-05-28 | 2021-08-27 | 广州德勤龙健电子有限公司 | Main/standby switching device and method for audio power amplifier |
| CN113315479B (en) * | 2021-05-28 | 2023-02-28 | 广州德勤龙健电子有限公司 | Main/standby switching device and method for audio power amplifier |
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