WO2022239608A1 - Transmission device - Google Patents
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- WO2022239608A1 WO2022239608A1 PCT/JP2022/018110 JP2022018110W WO2022239608A1 WO 2022239608 A1 WO2022239608 A1 WO 2022239608A1 JP 2022018110 W JP2022018110 W JP 2022018110W WO 2022239608 A1 WO2022239608 A1 WO 2022239608A1
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 22
- 230000001360 synchronised effect Effects 0.000 claims abstract description 91
- 230000005236 sound signal Effects 0.000 claims abstract description 16
- 238000012544 monitoring process Methods 0.000 claims description 18
- 230000002194 synthesizing effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/12—Arrangements for observation, testing or troubleshooting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to an FM transmission apparatus having redundancy against modulator abnormalities.
- Transmission devices for broadcasting are designed to be redundant in order to prevent the suspension of broadcasting due to sudden events such as device failure.
- two transmitters that emit different RF signals are used, one of which is used normally (active system) and the other is used as a spare transmitter (standby system) when the active system fails.
- a configuration is known in which a switch is used to switch between the output of the active system transmission unit and the output of the standby system transmission unit according to the demand.
- the switch since it takes a certain amount of time for the switching operation to be performed by the switch, there is a period during which the output is interrupted during this switching operation.
- the requirements for the reliability and characteristics of the switch used for this purpose have become stricter, the switch has become more expensive.
- the two transmission units are not divided into two, the active system and the standby system, as described above, but the RF signal that is the output of each is divided into two, and the RF signal after distribution is divided into two.
- a transmission device is described that combines and outputs after changing the combination according to the situation. According to this configuration, interruption of the signal at the time of switching is suppressed. However, even in this case, the operation of switching the combination is performed, so the use of the switcher is essential. Also, the two RF signals must be synthesized while their frequencies and phases are matched.
- Patent Document 2 by providing a phase controller, the frequency and phase of the RF signal output by the transmission unit of the standby system match the frequency and phase of the RF signal output by the transmission unit of the active system.
- a technique is described in which the matching RF signals are always combined and output.
- the RF signals of the active system and the standby system and the combined signal are the same except for the intensity, and even if the active system fails and the RF signal is lost, the combined signal will be the RF signal of the standby system. signal, and the desired RF signal is obtained without any special switching action. Therefore, no interruption of the signal occurs during the switching operation.
- JP-A-2001-326579 Japanese Patent Application Laid-Open No. 2021-34970
- the output of the FM modulator is input to the power amplifier in the subsequent stage and emitted from the transmitter as an RF signal as described above. Since it is necessary to suppress the interruption of broadcasting due to the failure of the FM modulator, it has been desired to provide similar redundancy for the failure of the FM modulator.
- the present invention has been made in view of such circumstances, and aims to solve the above problems.
- the present invention is a transmission apparatus using an output signal obtained by performing FM modulation of a carrier wave with an audio signal, wherein the common audio signal is synchronized by inputting a common reference signal.
- a synchronous first modulating unit and a synchronous second modulating unit that perform FM modulation of the common carrier wave, and a first modulated signal that is the output of the synchronous first modulating unit and the output of the synchronous second modulating unit and a synthesizing unit for synthesizing the second modulated signal and outputting it as the output signal.
- an output signal adjusting section may be provided for controlling the first synchronous modulating section and the second synchronous modulating section to adjust the intensity of the first modulating signal and the second modulating signal.
- the output signal adjustment unit adjusts the output level to a predetermined range based on the detected output level of the output signal or by external control, the synchronous first modulation unit, the A synchronous second modulation unit may be controlled.
- the audio signal synthesized with a pilot signal in a stereo system is input to the first synchronous modulation section and the second synchronous modulation section, and the pilot signal and the second modulation in the first modulated signal are input to the first synchronous modulation section and the second synchronous modulation section.
- a first modulated signal monitoring unit and a second modulated signal monitoring unit respectively recognizing the presence or absence of the pilot signal in a signal, wherein either the first modulated signal or the second modulated signal is The one output may be stopped when the pilot signal is not recognized.
- FIG. 2 is a diagram showing a partial configuration of a transmission device according to an embodiment
- FIG. FIG. 3 is a diagram showing a partial configuration of a conventional transmission device
- FIG. 1 is a diagram showing the configuration of this transmission device 1. As shown in FIG.
- FIG. 1 partially shows only the configuration up to outputting an FM signal FM-modulated with a stereo audio signal in this transmitting apparatus 1 .
- the configuration of FIG. 1 corresponds to, for example, a portion for outputting an FM-modulated signal in the transmitting apparatus described in Patent Documents 1 and 2, and can be applied to both active and standby transmitting apparatuses. Become.
- a synchronous first modulator (synchronous first modulator) 11 and a synchronous second modulator (synchronous second modulator) 12 that FM-modulate a carrier wave with a common audio signal are used.
- the first modulator 11 generates FM1 (first modulated signal)
- the synchronous second modulator 12 generates FM2 (second modulated signal).
- the first synchronous modulator 11 and the second synchronous modulator 12 operate independently, their operations are synchronized by inputting a common reference signal.
- FM1 and FM2 are combined by a combiner (combining unit) 13 and output as an output signal. Therefore, no switching operation is performed in this transmitting apparatus 1, so that the output signal is not interrupted at the time of switching.
- the first synchronous modulator 11 and the second synchronous modulator 12 operate in synchronization as described above.
- the reference signal generator 20 in FIG. 1 is used.
- an Rb (rubidium) oscillator can be used as the reference signal generator 20 .
- the Rb oscillator emits a 10 MHz signal and a 1 PPS (Pulse Per Second) signal, and these signals are used as a common reference signal for synchronization between relay stations located at different locations, for example, in synchronous broadcasting. used on occasion.
- FM1 and FM2 are modulated with a common audio signal, this essentially makes FM1 and FM2 the same signal. Since the input audio signal is a stereo audio signal, both FM1 and FM2 include a pilot signal added in the stereo system.
- the output signal obtained by combining FM1 and FM2 by the combiner 13 is the same signal as FM1 and FM2, differing only in output level (amplitude).
- FM1 is lost when the first synchronous modulator 11 fails
- FM2 is lost when the second synchronous modulator 12 fails. only fluctuates and the output signal becomes equal to FM2 in the former case and FM1 in the latter case. signal is obtained. Therefore, even if a failure occurs in the first synchronous modulator 11 or the second synchronous modulator 12, the output signal is not interrupted.
- the reference signal generator 20 is a component of the transmitter 1 in FIG. 1, a similar reference signal can be input to the first synchronous modulator 11 and the second synchronous modulator 12. Insofar as the reference signal generator may be provided externally. A reference signal generator other than the Rb oscillator may be used as long as a reference signal for synchronizing the operations of the first synchronous modulator 11 and the second synchronous modulator 12 can be obtained.
- the output signal monitor 14 and the output signal adjuster 15 are used for this purpose.
- the output signal monitor 14 extracts a part of the output signal output from the combiner 13 via the directional coupler 31 and detects the output level (amplitude) of the output signal.
- the output levels of FM1 and FM2 in the first synchronous modulator 11 and the second synchronous modulator 12 are output from the output signal adjustment section 15 to the first synchronous modulator 11 and the second synchronous modulator 12, respectively. It is adjustable by a directed output control signal.
- the output signal adjuster 15 can adjust the output levels of FM1 and FM2 based on the output level of the output signal detected by the output signal monitor 14 so that the output level of the output signal is within a certain range.
- the output signal adjustment unit 15 varies the output levels of FM1 and FM2 and recognizes the output level of the output signal, for example, even if the output level of one of FM1 and FM2 is abnormally low, the other By increasing the output level, it is possible to perform an operation in which the output level of the output signal is kept within a certain range. In this case, it takes a certain amount of time to complete this operation, and although the output level of the output signal fluctuates during this period, there is no interruption in the output signal during this period. Moreover, such adjustment of the output levels of FM1 and FM2 by the output signal adjusting section 15 may be performed from outside the transmitting apparatus 1 . At this time, for example, an output signal monitor may be provided outside.
- the output signal adjustment unit 15 is operated to detect a failure in one of the first synchronous modulator 11 and the second synchronous modulator 12, for example. It is not necessary to recognize the effect directly.
- the first modulated signal monitoring unit 16 and the second modulated signal monitoring unit 17 in FIG. 1 directly recognize that a failure has occurred in the synchronous first modulator 11 and the synchronous second modulator 12. . This point will be described below.
- stereo audio signals are used here.
- this audio signal actually uses a left signal (L) and a right signal (R), as described in Japanese Unexamined Patent Application Publication No. 2007-103986, for example.
- a composite signal is obtained by synthesizing the 19 kHz pilot signal.
- L and R can be reproduced properly using this pilot signal. Therefore, under the precondition that the audio signal is of the stereo system, FM1 and FM2 always include this pilot signal.
- the first modulated signal monitoring unit 16 receives a portion of FM1 via a directional coupler 32
- the second modulated signal monitoring unit 17 receives a portion of FM2 via a directional coupler 33.
- the first modulated signal monitoring section 16 and the second modulated signal monitoring section 17 check whether or not there is a pilot signal. If the pilot signal is not seen in FM1, it can be assumed that the first synchronous modulator 11 is not working properly, and similarly for FM2 (second synchronous modulator 12). In this way, when the pilot signal is not recognized in FM1, the first modulated signal monitoring unit 16, and when the pilot signal is not recognized in FM2, the second modulated signal monitoring unit 17 instructs the control unit 18. issue an alarm.
- the control unit 18 outputs on/off control signals for controlling power supply (on/off) to the first synchronous modulator 11 and the second synchronous modulator 12 . Therefore, the control unit 18 operates the synchronous first modulator 11 when receiving an alarm from the first modulated signal monitoring unit 16, and operates the synchronous first modulator 11 when receiving an alarm from the second modulated signal monitoring unit 17. 2 modulators 12 can be turned off respectively.
- the operation of the output signal adjusting section 15 as described above allows the output level of the output signal to be within the appropriate range. That is, by using the output signal adjusting section 15, the first modulated signal monitoring section 16, and the second modulated signal monitoring section 17 as described above, either the first synchronous modulator 11 or the second synchronous modulator 12 Even if a failure occurs in the output signal, the output level of the output signal can be maintained within a certain range without causing an interruption in the output signal.
- FIG. 2 shows a partial configuration of a conventional transmission device 9 to be compared, corresponding to FIG.
- this transmitting device 9 two independent ordinary FM modulators, a first modulator 91 and a second modulator 92, are used for FM modulation in the same manner as in the transmitting device 1 described above.
- the carrier wave is FM-modulated to generate an FM signal (FM11 by the first modulator 91 and FM12 by the second modulator 92).
- the first modulator 91 is used as the active system and the second modulator 92 is used as the standby system.
- the first modulator 91 and the second modulator 92 do not operate synchronously.
- both the first modulator 91 and the second modulator 92 have a self-diagnostic function, and if an alarm is issued when an abnormality occurs, the control unit 93 responds to an external command or this alarm. Accordingly, the switch 94 can be controlled to select the output FM11 from the first modulator 91 and the output FM12 from the second modulator 92 and output to the power amplifier side. At this time, the unselected side of FM11 and FM12 is input to the terminator 95 and disappears.
- FM11 is normally selected and FM12 is led to the terminator 95, and when the alarm is issued from the first modulator 91, the control section 93 selects the second modulator 92 (FM12) and is switched to the terminator 95.
- the synchronous first modulator 11 and the synchronous second modulator By using the modulator 12 and using the combiner 13 instead of the switch 94, even if a failure occurs in either the synchronous first modulator 11 or the synchronous second modulator 12, the output There are no interruptions in the signal.
- the output level of the output signal may fluctuate.
- the output level can be kept within a certain range by using the output signal adjusting section 15, the first modulated signal monitoring section 16, the second modulated signal monitoring section 17, etc. as described above.
- the present invention is suitable for obtaining a transmission device with a simple structure that has redundancy against FM modulator failure and does not require switching operation.
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Abstract
[Problem] To obtain a transmission device having a simple structure which has redundancy against failure of an FM modulator and does not require a switching operation. [Solution] A synchronous first modulator 11 and a synchronous second modulator 12 that are independent from one another and FM-modulate a carrier wave using a common audio signal are used, FM1 is generated by the synchronous first modulator 11, and FM2 is generated by the synchronous second modulator 12. Although the first synchronous modulator 11 and the second synchronous modulator 12 operate independently, the operations of said modulators are synchronized by a common reference signal being input. In the transmission device 1, the FM1 and FM2 are combined by a combiner 13 and output as an output signal. Therefore, no switching operation is performed in the transmission device 1, and thus the output signal is not interrupted at the time of switching.
Description
本発明は、変調器の異常に対して冗長性を有するFM方式の送信装置に関する。
The present invention relates to an FM transmission apparatus having redundancy against modulator abnormalities.
放送用の送信装置においては、装置の故障等の突発的な事象によって放送が停止することを抑制するために、冗長化が図られている。例えば、異なるRF信号を発する2つの送信部を用い、その一方を通常使用する送信部(現用系)、他方を現用系が故障した際に予備的に使用する送信部(待機系)とし、状況に応じ切替器によって現用系の送信部の出力と待機系の送信部の出力を切り替えて用いる構成が知られている。ただし、切替器によって切替動作が行われる際には一定の時間を要するため、この切替動作の際には出力が中断する期間が発生する。また、このために用いられる切替器の信頼性や特性に対する要求が厳しくなるため、切替器が高価となった。
Transmission devices for broadcasting are designed to be redundant in order to prevent the suspension of broadcasting due to sudden events such as device failure. For example, two transmitters that emit different RF signals are used, one of which is used normally (active system) and the other is used as a spare transmitter (standby system) when the active system fails. A configuration is known in which a switch is used to switch between the output of the active system transmission unit and the output of the standby system transmission unit according to the demand. However, since it takes a certain amount of time for the switching operation to be performed by the switch, there is a period during which the output is interrupted during this switching operation. In addition, since the requirements for the reliability and characteristics of the switch used for this purpose have become stricter, the switch has become more expensive.
特許文献1には、2つの送信部を前記のように特に現用系と待機系の2つに区分せず、各々の出力となるRF信号をそれぞれ2つに分配し、分配後のRF信号の組み合わせを状況に応じて変えた上で合成して出力する送信装置が記載されている。この構成によれば、切替時に信号が中断することは抑制される。ただし、この場合においても、組み合わせを切り替える動作は行われるため、切替器の使用は必須となる。また、2つのRF信号の周波数、位相が整合した状態でこれらが合成される必要がある。
In Patent Document 1, the two transmission units are not divided into two, the active system and the standby system, as described above, but the RF signal that is the output of each is divided into two, and the RF signal after distribution is divided into two. A transmission device is described that combines and outputs after changing the combination according to the situation. According to this configuration, interruption of the signal at the time of switching is suppressed. However, even in this case, the operation of switching the combination is performed, so the use of the switcher is essential. Also, the two RF signals must be synthesized while their frequencies and phases are matched.
これに対して、特許文献2には、位相制御器を設けることによって、待機系の送信部が出力するRF信号の周波数及び位相を現用系の送信部が出力するRF信号の周波数及び位相と一致させ、一致後のRF信号を常時合成して出力する技術が記載されている。この場合には、現用系、待機系のRF信号と合成後の信号は強度以外は同一となり、仮に現用系が故障してそのRF信号が失われても、合成後の信号は待機系のRF信号と等しくなり、特に切替動作を要さずに、所望のRF信号が得られる。このため、切替動作の際の信号の中断は発生しない。
On the other hand, in Patent Document 2, by providing a phase controller, the frequency and phase of the RF signal output by the transmission unit of the standby system match the frequency and phase of the RF signal output by the transmission unit of the active system. A technique is described in which the matching RF signals are always combined and output. In this case, the RF signals of the active system and the standby system and the combined signal are the same except for the intensity, and even if the active system fails and the RF signal is lost, the combined signal will be the RF signal of the standby system. signal, and the desired RF signal is obtained without any special switching action. Therefore, no interruption of the signal occurs during the switching operation.
FM放送用の送信装置においては、FM変調器の出力が後段の電力増幅器に入力し送信部から上記のようなRF信号として発せられる。このFM変調器の故障による放送の中断も抑制することが必要であるため、FM変調器の故障に対しても、同様の冗長化を図ることが望まれた。
In a transmitter for FM broadcasting, the output of the FM modulator is input to the power amplifier in the subsequent stage and emitted from the transmitter as an RF signal as described above. Since it is necessary to suppress the interruption of broadcasting due to the failure of the FM modulator, it has been desired to provide similar redundancy for the failure of the FM modulator.
この場合においては、特許文献1、2に記載されたような送信部毎に更にこのように2つのFM変調器(現用系、待機系)を設け、このFM変調器を切り替える動作を行う(切替器を用いる)、あるいは特許文献2に記載の技術のようにRF信号の切替を行なわずに2つのFM変調器からの出力を取り出すことが必要になった。
In this case, two FM modulators (active system, standby system) are further provided for each transmission unit as described in Patent Documents 1 and 2, and the operation of switching between these FM modulators is performed (switching It has become necessary to take out outputs from two FM modulators without switching RF signals as in the technique described in Patent Document 2).
しかしながら、この場合において切替器を用いる場合には切替器の数が多くなるために送信装置が高価となる、あるいは切替に伴う問題が更に多く発生した。あるいは、特許文献2に記載の技術のように切替器を用いない場合には、切替に伴う問題は発生しないものの、構成が複雑となるために送信装置が高価となった。
However, in this case, if a switch is used, the number of switches increases, which makes the transmitter expensive, or causes more problems associated with switching. Alternatively, if a switch is not used as in the technique described in Patent Document 2, although there is no problem associated with switching, the configuration becomes complicated and the cost of the transmission apparatus increases.
このため、FM変調器の故障に対する冗長性を有し、切替動作を要しない単純な構造の送信装置が望まれた。
For this reason, a transmitter with a simple structure that has redundancy against failure of the FM modulator and does not require a switching operation has been desired.
本発明は、このような状況に鑑みなされたもので、上記課題を解決することを目的とする。
The present invention has been made in view of such circumstances, and aims to solve the above problems.
本発明は、音声信号で搬送波のFM変調が行なわれた出力信号が用いられる送信装置であって、共通の基準信号が入力されることによって同期化が行なわれた状態で、共通の前記音声信号によって共通の前記搬送波のFM変調を行う同期式第1変調部及び同期式第2変調部と、前記同期式第1変調部の出力である第1変調信号と前記同期式第2変調部の出力である第2変調信号とを合成して前記出力信号として出力する合成部と、を具備する。
この際、前記同期式第1変調部、前記同期式第2変調部を制御して前記第1変調信号、前記第2変調信号の強度を調整する出力信号調整部を具備してもよい。
また、前記出力信号調整部は、検出された前記出力信号の出力レベルに基き、又は外部からの制御によって、前記出力レベルが予め定められた範囲となるように前記同期式第1変調部、前記同期式第2変調部を制御してもよい。
また、ステレオ方式とされパイロット信号が合成された前記音声信号が前記同期式第1変調部及び前記同期式第2変調部に入力し、前記第1変調信号中における前記パイロット信号、前記第2変調信号中における前記パイロット信号、の有無をそれぞれ認識する第1変調信号監視部、第2変調信号監視部、をそれぞれ具備し、前記第1変調信号、前記第2変調信号のうちのいずれか一方において前記パイロット信号が認識されなかった場合において、当該一方の出力が停止されてもよい。 The present invention is a transmission apparatus using an output signal obtained by performing FM modulation of a carrier wave with an audio signal, wherein the common audio signal is synchronized by inputting a common reference signal. a synchronous first modulating unit and a synchronous second modulating unit that perform FM modulation of the common carrier wave, and a first modulated signal that is the output of the synchronous first modulating unit and the output of the synchronous second modulating unit and a synthesizing unit for synthesizing the second modulated signal and outputting it as the output signal.
At this time, an output signal adjusting section may be provided for controlling the first synchronous modulating section and the second synchronous modulating section to adjust the intensity of the first modulating signal and the second modulating signal.
Further, the output signal adjustment unit adjusts the output level to a predetermined range based on the detected output level of the output signal or by external control, the synchronous first modulation unit, the A synchronous second modulation unit may be controlled.
Further, the audio signal synthesized with a pilot signal in a stereo system is input to the first synchronous modulation section and the second synchronous modulation section, and the pilot signal and the second modulation in the first modulated signal are input to the first synchronous modulation section and the second synchronous modulation section. a first modulated signal monitoring unit and a second modulated signal monitoring unit respectively recognizing the presence or absence of the pilot signal in a signal, wherein either the first modulated signal or the second modulated signal is The one output may be stopped when the pilot signal is not recognized.
この際、前記同期式第1変調部、前記同期式第2変調部を制御して前記第1変調信号、前記第2変調信号の強度を調整する出力信号調整部を具備してもよい。
また、前記出力信号調整部は、検出された前記出力信号の出力レベルに基き、又は外部からの制御によって、前記出力レベルが予め定められた範囲となるように前記同期式第1変調部、前記同期式第2変調部を制御してもよい。
また、ステレオ方式とされパイロット信号が合成された前記音声信号が前記同期式第1変調部及び前記同期式第2変調部に入力し、前記第1変調信号中における前記パイロット信号、前記第2変調信号中における前記パイロット信号、の有無をそれぞれ認識する第1変調信号監視部、第2変調信号監視部、をそれぞれ具備し、前記第1変調信号、前記第2変調信号のうちのいずれか一方において前記パイロット信号が認識されなかった場合において、当該一方の出力が停止されてもよい。 The present invention is a transmission apparatus using an output signal obtained by performing FM modulation of a carrier wave with an audio signal, wherein the common audio signal is synchronized by inputting a common reference signal. a synchronous first modulating unit and a synchronous second modulating unit that perform FM modulation of the common carrier wave, and a first modulated signal that is the output of the synchronous first modulating unit and the output of the synchronous second modulating unit and a synthesizing unit for synthesizing the second modulated signal and outputting it as the output signal.
At this time, an output signal adjusting section may be provided for controlling the first synchronous modulating section and the second synchronous modulating section to adjust the intensity of the first modulating signal and the second modulating signal.
Further, the output signal adjustment unit adjusts the output level to a predetermined range based on the detected output level of the output signal or by external control, the synchronous first modulation unit, the A synchronous second modulation unit may be controlled.
Further, the audio signal synthesized with a pilot signal in a stereo system is input to the first synchronous modulation section and the second synchronous modulation section, and the pilot signal and the second modulation in the first modulated signal are input to the first synchronous modulation section and the second synchronous modulation section. a first modulated signal monitoring unit and a second modulated signal monitoring unit respectively recognizing the presence or absence of the pilot signal in a signal, wherein either the first modulated signal or the second modulated signal is The one output may be stopped when the pilot signal is not recognized.
本発明によると、FM変調器の故障に対する冗長性を有し、切替動作を要しない単純な構造の送信装置を得ることができる。
According to the present invention, it is possible to obtain a transmission device with a simple structure that has redundancy against failure of the FM modulator and does not require switching operation.
次に、本発明を実施するための形態を図面を参照して具体的に説明する。本発明の実施の形態に係る送信装置は、ステレオ方式のFM放送に使用される。この送信装置は2つのFM変調器を有するためにFM変調器の異常(故障)に対して冗長性を有するが、出力される信号の中断を生ずるような切替動作は行なわれない。図1は、この送信装置1の構成を示す図である。
Next, embodiments for carrying out the present invention will be specifically described with reference to the drawings. A transmitting apparatus according to an embodiment of the present invention is used for stereo FM broadcasting. Since this transmitter has two FM modulators, it has redundancy against malfunction of the FM modulators, but there is no switching operation that would cause an interruption of the output signal. FIG. 1 is a diagram showing the configuration of this transmission device 1. As shown in FIG.
図1においては、この送信装置1においてステレオ方式の音声信号でFM変調されたFM信号が出力されるまでの構成のみが部分的に示されている。このため、図1の構成は、例えば特許文献1、2に記載の送信装置におけるFM変調後の信号の出力をする部分に対応し、現用系、待機系の送信装置のそれぞれにおいて適用が可能となる。
FIG. 1 partially shows only the configuration up to outputting an FM signal FM-modulated with a stereo audio signal in this transmitting apparatus 1 . For this reason, the configuration of FIG. 1 corresponds to, for example, a portion for outputting an FM-modulated signal in the transmitting apparatus described in Patent Documents 1 and 2, and can be applied to both active and standby transmitting apparatuses. Become.
ここで、共通の音声信号で搬送波をFM変調する同期式第1変調器(同期式第1変調部)11と同期式第2変調器(同期式第2変調部)12が用いられ、同期式第1変調器11によってFM1(第1変調信号)が生成され、同期式第2変調器12によってFM2(第2変調信号)が生成される。同期式第1変調器11、同期式第2変調器12はそれぞれ独立して動作を行うものの、共通の基準信号が入力されることによって、これらの動作は同期している。
Here, a synchronous first modulator (synchronous first modulator) 11 and a synchronous second modulator (synchronous second modulator) 12 that FM-modulate a carrier wave with a common audio signal are used. The first modulator 11 generates FM1 (first modulated signal), and the synchronous second modulator 12 generates FM2 (second modulated signal). Although the first synchronous modulator 11 and the second synchronous modulator 12 operate independently, their operations are synchronized by inputting a common reference signal.
また、この送信装置1においては、合成器(合成部)13によってFM1とFM2が合成されて出力信号とされて出力される。このため、この送信装置1においては切替動作は行なわれず、このために切替時における出力信号の中断は発生しない。
In addition, in this transmitting device 1, FM1 and FM2 are combined by a combiner (combining unit) 13 and output as an output signal. Therefore, no switching operation is performed in this transmitting apparatus 1, so that the output signal is not interrupted at the time of switching.
以下に、上記の動作、及び図1におけるその他の構成要素について詳細に説明する。まず、同期式第1変調器11と同期式第2変調器12は、前記のように同期して動作する。このために、図1における基準信号発生器20が用いられる。基準信号発生器20としては、具体的には、例えばRb(ルビジウム)発振器を用いることができる。Rb発振器は、周知のように10MHzの信号と1PPS(Pulse Per Second)信号を発し、例えば同期放送において異なる場所にある中継局間の同期をとるために、これらの信号を共通の基準信号として用いる際に使用される。
The above operations and other components in FIG. 1 will be described in detail below. First, the first synchronous modulator 11 and the second synchronous modulator 12 operate in synchronization as described above. For this purpose the reference signal generator 20 in FIG. 1 is used. Specifically, for example, an Rb (rubidium) oscillator can be used as the reference signal generator 20 . As is well known, the Rb oscillator emits a 10 MHz signal and a 1 PPS (Pulse Per Second) signal, and these signals are used as a common reference signal for synchronization between relay stations located at different locations, for example, in synchronous broadcasting. used on occasion.
このため、同期式第1変調器11と同期式第2変調器12にこの基準信号を入力させれば、FM1とFM2の同期をとる(位相を同一とする)ことができる。このような同期式変調器は、例えばhttps://nitsuki.com/products/fm_radio/fm_sync_broadcasting.htmlに記載されている。FM1とFM2は共通の音声信号で変調されるため、これにより、本質的にはFM1とFM2は同一の信号となる。また、入力される音声信号はステレオ方式の音声信号であるため、FM1、FM2には、共にステレオ方式の際に付加されるパイロット信号が含まれている。
Therefore, by inputting this reference signal to the first synchronous modulator 11 and the second synchronous modulator 12, it is possible to synchronize FM1 and FM2 (make the phases the same). Such a synchronous modulator can be found at https://nitsuki.com, for example. com/products/fm_radio/fm_sync_broadcasting. html is described. Since FM1 and FM2 are modulated with a common audio signal, this essentially makes FM1 and FM2 the same signal. Since the input audio signal is a stereo audio signal, both FM1 and FM2 include a pilot signal added in the stereo system.
このため、合成器13によってFM1とFM2が合成された出力信号は、FM1、FM2とは出力レベル(振幅)のみが異なる同一の信号となる。この際、同期式第1変調器11が故障した場合にはFM1が失われ、同期式第2変調器12が故障した場合にはFM2が失われるが、この場合には、出力信号の出力レベルのみが変動し、出力信号は前者の場合にはFM2、後者の場合にはFM1と等しくなり、結局、同期式第1変調器11、同期式第2変調器12の故障の前後にわたり同一の出力信号が得られる。このため、同期式第1変調器11、同期式第2変調器12に故障が発生しても、出力信号の中断は発生しない。
Therefore, the output signal obtained by combining FM1 and FM2 by the combiner 13 is the same signal as FM1 and FM2, differing only in output level (amplitude). At this time, FM1 is lost when the first synchronous modulator 11 fails, and FM2 is lost when the second synchronous modulator 12 fails. only fluctuates and the output signal becomes equal to FM2 in the former case and FM1 in the latter case. signal is obtained. Therefore, even if a failure occurs in the first synchronous modulator 11 or the second synchronous modulator 12, the output signal is not interrupted.
なお、図1においては基準信号発生器20は送信装置1の構成要素とされているが、同様の基準信号を同期式第1変調器11と同期式第2変調器12に入力させることができる限りにおいて、基準信号発生器を外部に設けてもよい。また、同期式第1変調器11と同期式第2変調器12の動作を同期させるための基準信号が得られる限りにおいて、Rb発振器以外の基準信号発生器を用いてもよい。
Although the reference signal generator 20 is a component of the transmitter 1 in FIG. 1, a similar reference signal can be input to the first synchronous modulator 11 and the second synchronous modulator 12. Insofar as the reference signal generator may be provided externally. A reference signal generator other than the Rb oscillator may be used as long as a reference signal for synchronizing the operations of the first synchronous modulator 11 and the second synchronous modulator 12 can be obtained.
上記に記載の動作においては、同期式第1変調器11、同期式第2変調器12に故障が発生した場合に出力信号は失われないものの、出力レベル(振幅)は変動する。しかしながら、この場合において、出力レベルの変動も抑制することができる。図1において、出力信号モニタ14、出力信号調整部15はこのために用いられる。
In the operation described above, although the output signal is not lost when a failure occurs in the first synchronous modulator 11 and the second synchronous modulator 12, the output level (amplitude) fluctuates. However, in this case, fluctuations in the output level can also be suppressed. In FIG. 1, the output signal monitor 14 and the output signal adjuster 15 are used for this purpose.
出力信号モニタ14は、方向性結合器31を介して合成器13から出力された出力信号の一部を取り出し、出力信号の出力レベル(振幅)を検出する。一方、同期式第1変調器11、同期式第2変調器12におけるFM1、FM2の出力レベルは、出力信号調整部15から同期式第1変調器11、同期式第2変調器12の各々に向けて発せられる出力制御信号によって調整可能とされる。出力信号調整部15は、出力信号モニタ14によって検知された出力信号の出力レベルに基づき、出力信号の出力レベルが一定の範囲となるようにFM1、FM2の出力レベルを調整することができる。
The output signal monitor 14 extracts a part of the output signal output from the combiner 13 via the directional coupler 31 and detects the output level (amplitude) of the output signal. On the other hand, the output levels of FM1 and FM2 in the first synchronous modulator 11 and the second synchronous modulator 12 are output from the output signal adjustment section 15 to the first synchronous modulator 11 and the second synchronous modulator 12, respectively. It is adjustable by a directed output control signal. The output signal adjuster 15 can adjust the output levels of FM1 and FM2 based on the output level of the output signal detected by the output signal monitor 14 so that the output level of the output signal is within a certain range.
この際、出力信号調整部15は、FM1、FM2の出力レベルを変動させると共に出力信号の出力レベルを認識すれば、例えばFM1、FM2のうちの一方の出力レベルが異常に低い場合でも、他方の出力レベルを高めることによって、出力信号の出力レベルを一定の範囲とする操作を行うことができる。この場合、この操作が完了するまでには一定の時間を要し、その間には出力信号の出力レベルは変動するものの、この間においても出力信号に中断が発生することはない。また、出力信号調整部15によるこのようなFM1、FM2の出力レベルの調整は、送信装置1の外部から行なわれていてもよい。この際、例えば出力信号モニタは外部に設けられていてもよい。
At this time, if the output signal adjustment unit 15 varies the output levels of FM1 and FM2 and recognizes the output level of the output signal, for example, even if the output level of one of FM1 and FM2 is abnormally low, the other By increasing the output level, it is possible to perform an operation in which the output level of the output signal is kept within a certain range. In this case, it takes a certain amount of time to complete this operation, and although the output level of the output signal fluctuates during this period, there is no interruption in the output signal during this period. Moreover, such adjustment of the output levels of FM1 and FM2 by the output signal adjusting section 15 may be performed from outside the transmitting apparatus 1 . At this time, for example, an output signal monitor may be provided outside.
このように出力信号の出力レベルを一定にする操作を行うに際しては、出力信号調整部15は、例えば同期式第1変調器11、同期式第2変調器12のうちの一方に故障が発生した旨を直接的に認識する必要はない。これに対して、図1における第1変調信号監視部16、第2変調信号監視部17は、同期式第1変調器11、同期式第2変調器12に故障が発生した旨を直接認識する。この点について以下に説明する。
When performing the operation to make the output level of the output signal constant in this way, the output signal adjustment unit 15 is operated to detect a failure in one of the first synchronous modulator 11 and the second synchronous modulator 12, for example. It is not necessary to recognize the effect directly. On the other hand, the first modulated signal monitoring unit 16 and the second modulated signal monitoring unit 17 in FIG. 1 directly recognize that a failure has occurred in the synchronous first modulator 11 and the synchronous second modulator 12. . This point will be described below.
前記の通り、ここではステレオ方式の音声信号が用いられる。周知のように、この音声信号は、例えば特開2007-103986号公報に記載されるように、実際には左側信号(L)、右側信号(R)を用い、L+R成分、L-R成分と19kHzのパイロット信号が合成されたコンポジット信号となり、同期式第1変調器11、同期式第2変調器12においては、搬送波がこのコンポジット信号でFM変調される。この信号を受信した受信側においては、このパイロット信号を用いてL、Rを適正に再生することができる。このため、音声信号がステレオ方式のものであるという前提条件下では、FM1、FM2にはこのパイロット信号が必ず含まれる。
As mentioned above, stereo audio signals are used here. As is well known, this audio signal actually uses a left signal (L) and a right signal (R), as described in Japanese Unexamined Patent Application Publication No. 2007-103986, for example. A composite signal is obtained by synthesizing the 19 kHz pilot signal. On the receiving side receiving this signal, L and R can be reproduced properly using this pilot signal. Therefore, under the precondition that the audio signal is of the stereo system, FM1 and FM2 always include this pilot signal.
ここで、第1変調信号監視部16には方向性結合器32を介してFM1の一部が、第2変調信号監視部17には方向性結合器33を介してFM2の一部が、それぞれ入力し、第1変調信号監視部16、第2変調信号監視部17は、これらにおけるパイロット信号の有無をチェックする。パイロット信号がFM1において認められなかった場合には、同期式第1変調器11は適正に動作していないと推定することができ、FM2(同期式第2変調器12)についても同様である。このように、FM1にパイロット信号が認められなかった場合には第1変調信号監視部16、FM2にパイロット信号が認められなかった場合には第2変調信号監視部17は、それぞれ制御部18に対してアラームを発する。
Here, the first modulated signal monitoring unit 16 receives a portion of FM1 via a directional coupler 32, and the second modulated signal monitoring unit 17 receives a portion of FM2 via a directional coupler 33. Then, the first modulated signal monitoring section 16 and the second modulated signal monitoring section 17 check whether or not there is a pilot signal. If the pilot signal is not seen in FM1, it can be assumed that the first synchronous modulator 11 is not working properly, and similarly for FM2 (second synchronous modulator 12). In this way, when the pilot signal is not recognized in FM1, the first modulated signal monitoring unit 16, and when the pilot signal is not recognized in FM2, the second modulated signal monitoring unit 17 instructs the control unit 18. issue an alarm.
制御部18は、同期式第1変調器11、同期式第2変調器12の電力供給(オン・オフ)を制御するオンオフ制御信号を各々に対して出力する。このため、制御部18は、第1変調信号監視部16からアラームを受信した場合には同期式第1変調器11を、第2変調信号監視部17からアラームを受信した場合には同期式第2変調器12を、それぞれオフすることができる。
The control unit 18 outputs on/off control signals for controlling power supply (on/off) to the first synchronous modulator 11 and the second synchronous modulator 12 . Therefore, the control unit 18 operates the synchronous first modulator 11 when receiving an alarm from the first modulated signal monitoring unit 16, and operates the synchronous first modulator 11 when receiving an alarm from the second modulated signal monitoring unit 17. 2 modulators 12 can be turned off respectively.
一般的には、同期式第1変調器11が故障した場合にはFM1が発せられずに出力信号はFM2と等しくなり、同期式第2変調器12が故障した場合にはFM2が発せられずに出力信号はFM1と等しくなると考えられる。しかしながら、同期式第1変調器11、同期式第2変調器12が故障してこれらから不適正な出力がFM1、FM2として発せられた場合には、この不適正な出力はノイズとなり、出力信号(FM1+FM2)も適正でなくなる。このため、FM1が適正でない場合には同期式第1変調器11を、FM2が適正でない場合には同期式第2変調器12を、それぞれオフすることが好ましい。制御部18は、このような動作を行うことができる。
Generally, when the synchronous first modulator 11 fails, FM1 is not emitted and the output signal is equal to FM2, and when the synchronous second modulator 12 fails, FM2 is not emitted. , the output signal will be equal to FM1. However, when the synchronous first modulator 11 and the synchronous second modulator 12 are out of order and improper outputs are generated as FM1 and FM2, the improper outputs become noise, resulting in an output signal. (FM1+FM2) is also not correct. Therefore, it is preferable to turn off the first synchronous modulator 11 when FM1 is not appropriate, and to turn off the second synchronous modulator 12 when FM2 is not appropriate. The control unit 18 can perform such operations.
この動作において、同期式第1変調器11、同期式第2変調器12のオフ時には出力信号の出力レベルは変動するものの、出力信号の中断は発生しない。また、同期式第1変調器11、同期式第2変調器12のオフ後には、前記のような出力信号調整部15の動作によって、出力信号の出力レベルを適正な範囲とすることができる。すなわち、上記のような出力信号調整部15、第1変調信号監視部16、第2変調信号監視部17を用いることによって、同期式第1変調器11、同期式第2変調器12のいずれかに故障が発生した場合でも、出力信号に中断を発生させることなく、かつ出力信号の出力レベルを一定の範囲内に維持することができる。
In this operation, when the first synchronous modulator 11 and the second synchronous modulator 12 are turned off, the output level of the output signal fluctuates, but the output signal is not interrupted. Further, after the first synchronous modulator 11 and the second synchronous modulator 12 are turned off, the operation of the output signal adjusting section 15 as described above allows the output level of the output signal to be within the appropriate range. That is, by using the output signal adjusting section 15, the first modulated signal monitoring section 16, and the second modulated signal monitoring section 17 as described above, either the first synchronous modulator 11 or the second synchronous modulator 12 Even if a failure occurs in the output signal, the output level of the output signal can be maintained within a certain range without causing an interruption in the output signal.
図2は、比較対象となる従来の送信装置9の部分的な構成を図1に対応させて示す。この送信装置9においては、上記の送信装置1と同様に独立した2つの通常のFM変調器である第1変調器91、第2変調器92がFM変調のために用いられ、これらにおいては、共通の音声信号が入力することによって、搬送波がFM変調されることによってFM信号(第1変調器91によりFM11、第2変調器92によってFM12)が生成される。ここでは、現用系として第1変調器91が用いられ、待機系として第2変調器92が用いられるものとする。前記の例とは異なり、第1変調器91、第2変調器92は同期した動作を行わない。
FIG. 2 shows a partial configuration of a conventional transmission device 9 to be compared, corresponding to FIG. In this transmitting device 9, two independent ordinary FM modulators, a first modulator 91 and a second modulator 92, are used for FM modulation in the same manner as in the transmitting device 1 described above. By inputting a common audio signal, the carrier wave is FM-modulated to generate an FM signal (FM11 by the first modulator 91 and FM12 by the second modulator 92). Here, it is assumed that the first modulator 91 is used as the active system and the second modulator 92 is used as the standby system. Unlike the previous example, the first modulator 91 and the second modulator 92 do not operate synchronously.
また、第1変調器91、第2変調器92が共に自己診断機能を有し、自身に異常が発生した場合にはアラームを発すれば、制御部93は、外部からの指令やこのアラームに応じて切替器94を制御し、第1変調器91の出力FM11、第2変調器92からの出力FM12を選択して電力増幅器側に出力させることができる。この際、FM11、FM12のうち、選択されなかった側は終端器95に入力して消滅する。ここで、通常はFM11が選択されてFM12は終端器95に導かれ、制御部93は、第1変調器91からアラームが発せられたら、第2変調器92(FM12)を選択し、かつFM11を終端器95に導くように切替器94を切替制御する。
Further, both the first modulator 91 and the second modulator 92 have a self-diagnostic function, and if an alarm is issued when an abnormality occurs, the control unit 93 responds to an external command or this alarm. Accordingly, the switch 94 can be controlled to select the output FM11 from the first modulator 91 and the output FM12 from the second modulator 92 and output to the power amplifier side. At this time, the unselected side of FM11 and FM12 is input to the terminator 95 and disappears. Here, FM11 is normally selected and FM12 is led to the terminator 95, and when the alarm is issued from the first modulator 91, the control section 93 selects the second modulator 92 (FM12) and is switched to the terminator 95.
図2の構成において、例えば第1変調器91からのアラームを制御部93が認識することによって切替器94を切り替える動作を行う場合には、ノイズ等の影響を避けるため、実際には一定時間以上のアラームの継続が認識された後でこの切替動作を開始する必要がある。また、切替器94の動作においても、切替の指令を制御部93が発してから切替後の信号が切替器94から発せられるまでにも一定の時間を要する。このため、切替動作が行われる際には、出力信号が中断する場合が多かった。
In the configuration of FIG. 2, for example, when the control unit 93 recognizes an alarm from the first modulator 91 to switch the switch 94, in order to avoid the influence of noise, etc., the operation is actually performed for a certain period of time or longer. This switching action must be initiated after the continuation of the alarm is recognized. Also, in the operation of the switcher 94, it takes a certain amount of time from when the control unit 93 issues a switching command to when the switcher 94 issues a signal after switching. Therefore, when the switching operation was performed, the output signal was often interrupted.
これに対して、上記の送信装置1においては、独立した2つの通常のFM変調器である第1変調器91、第2変調器92の代わりに同期式第1変調器11、同期式第2変調器12を用い、かつ切替器94の代わりに合成器13を用いることによって、同期式第1変調器11、同期式第2変調器12のいずれかに故障が発生した場合でも、これによって出力信号に中断が発生することはない。
On the other hand, in the transmitting apparatus 1, instead of the first modulator 91 and the second modulator 92, which are two independent ordinary FM modulators, the synchronous first modulator 11 and the synchronous second modulator By using the modulator 12 and using the combiner 13 instead of the switch 94, even if a failure occurs in either the synchronous first modulator 11 or the synchronous second modulator 12, the output There are no interruptions in the signal.
ただし、同期式第1変調器11、同期式第2変調器12のいずれかに故障が発生した場合には出力信号の出力レベルが変動するおそれがある。これに対しては、上記のように出力信号調整部15、第1変調信号監視部16、第2変調信号監視部17等を用いることによって、出力レベルを一定の範囲内にすることができる。
However, if a failure occurs in either the first synchronous modulator 11 or the second synchronous modulator 12, the output level of the output signal may fluctuate. In response to this, the output level can be kept within a certain range by using the output signal adjusting section 15, the first modulated signal monitoring section 16, the second modulated signal monitoring section 17, etc. as described above.
以上、本発明を実施形態をもとに説明した。この実施形態は例示であり、それらの各構成要素の組み合わせにいろいろな変形例が可能なこと、またそうした変形例も本発明の範囲にあることは当業者に理解されるところである。
The present invention has been described above based on the embodiments. It should be understood by those skilled in the art that this embodiment is an example, and that various modifications can be made to the combination of each component, and that such modifications are within the scope of the present invention.
この出願は、2021年5月10日に出願された日本出願特願2021-079438を基礎として優先権の利益を主張するものであり、その開示の全てを引用によってここに取り込む。
This application claims the benefit of priority based on Japanese Patent Application No. 2021-079438 filed on May 10, 2021, the entire disclosure of which is hereby incorporated by reference.
本発明は、FM変調器の故障に対する冗長性を有し、切替動作を要しない単純な構造の送信装置を得ることに適している。
The present invention is suitable for obtaining a transmission device with a simple structure that has redundancy against FM modulator failure and does not require switching operation.
1、9 送信装置11 同期式第1変調器(同期式第1変調部)12 同期式第2変調器(同期式第2変調部)13 合成器(合成部)14 出力信号モニタ15 出力信号調整部16 第1変調信号監視部17 第2変調信号監視部18、93 制御部20 基準信号発生器31~33 方向性結合器91 第1変調器92 第2変調器94 切替器95 終端器
1, 9 Transmitting device 11 Synchronous first modulator (synchronous first modulating section) 12 Synchronous second modulator (synchronous second modulating section) 13 Synthesizer (synthesizing section) 14 Output signal monitor 15 Output signal adjustment Unit 16 First modulated signal monitor 17 Second modulated signal monitor 18, 93 Control unit 20 Reference signal generators 31 to 33 Directional coupler 91 First modulator 92 Second modulator 94 Switcher 95 Terminator
Claims (4)
- 音声信号で搬送波のFM変調が行なわれた出力信号が用いられる送信装置であって、
共通の基準信号が入力されることによって同期化が行なわれた状態で、共通の前記音声信号によって共通の前記搬送波のFM変調を行う同期式第1変調部及び同期式第2変調部と、
前記同期式第1変調部の出力である第1変調信号と前記同期式第2変調部の出力である第2変調信号とを合成して前記出力信号として出力する合成部と、
を具備することを特徴とする送信装置。 A transmission device using an output signal obtained by performing FM modulation of a carrier wave with an audio signal,
a synchronous first modulating section and a synchronous second modulating section that perform FM modulation of the common carrier wave with the common audio signal in a state synchronized by inputting a common reference signal;
a synthesizing unit that synthesizes a first modulated signal that is the output of the first synchronous modulating unit and a second modulated signal that is the output of the second synchronous modulating unit and outputs the result as the output signal;
A transmitting device comprising: - 前記同期式第1変調部、前記同期式第2変調部を制御して前記第1変調信号、前記第2変調信号の強度を調整する出力信号調整部を具備することを特徴とする請求項1に記載の送信装置。 2. An output signal adjusting section for controlling the first synchronous modulating section and the second synchronous modulating section to adjust the intensity of the first modulating signal and the second modulating signal. 2. The transmitting device according to .
- 前記出力信号調整部は、検出された前記出力信号の出力レベルに基き、又は外部からの制御によって、前記出力レベルが予め定められた範囲となるように前記同期式第1変調部、前記同期式第2変調部を制御することを特徴とする請求項2に記載の送信装置。 The output signal adjustment unit adjusts the output level to a predetermined range based on the detected output level of the output signal or by external control, the synchronous first modulation unit, the synchronous 3. The transmitting apparatus according to claim 2, wherein the second modulating section is controlled.
- ステレオ方式とされパイロット信号が合成された前記音声信号が前記同期式第1変調部及び前記同期式第2変調部に入力し、
前記第1変調信号中における前記パイロット信号、前記第2変調信号中における前記パイロット信号、の有無をそれぞれ認識する第1変調信号監視部、第2変調信号監視部、をそれぞれ具備し、
前記第1変調信号、前記第2変調信号のうちのいずれか一方において前記パイロット信号が認識されなかった場合において、当該一方の出力が停止されることを特徴とする請求項1に記載の送信装置。 inputting the stereo audio signal synthesized with the pilot signal to the first synchronous modulation unit and the second synchronous modulation unit;
a first modulated signal monitoring unit and a second modulated signal monitoring unit that respectively recognize the presence or absence of the pilot signal in the first modulated signal and the pilot signal in the second modulated signal,
2. The transmitting apparatus according to claim 1, wherein when the pilot signal is not recognized in either one of the first modulated signal and the second modulated signal, the output of the one is stopped. .
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