JP2012227856A - Communication system, transmitter, receiver, and communication method - Google Patents

Communication system, transmitter, receiver, and communication method Download PDF

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JP2012227856A
JP2012227856A JP2011095794A JP2011095794A JP2012227856A JP 2012227856 A JP2012227856 A JP 2012227856A JP 2011095794 A JP2011095794 A JP 2011095794A JP 2011095794 A JP2011095794 A JP 2011095794A JP 2012227856 A JP2012227856 A JP 2012227856A
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JP5269940B2 (en
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Yuji Kawasaki
裕二 川崎
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Panasonic Corp
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PROBLEM TO BE SOLVED: To provide a broadband voice communication system capable of reducing a sound level of leakage sound outputted from a receiver to enhance the secrecy.SOLUTION: A communication system includes a microphone device 1 serving as a transmitter and a speaker device 15 as a receiver. When a broadband audio signal is inputted, the microphone device 1 performs balanced modulation processing that inverts a frequency of an audio signal, and superimposes a DCS signal or an operation signal on a frequency band lower than a reference frequency in the audio signal whose frequency is inverted, to transmit the resulting signal. When receiving the audio signal transmitted from the microphone device 1, the speaker device 15 reduces a signal having a frequency band lower than the reference frequency in the received audio signal, performs inverse balanced modulation processing that re-inverts the frequency of the audio signal, and outputs the audio signal whose frequency is re-inverted.

Description

本発明は、広帯域の音声信号を送受信する通信システムに関し、特に、秘話性を高める技術に関するものである。   The present invention relates to a communication system that transmits / receives a wideband audio signal, and more particularly to a technique for improving confidentiality.

トランシーバや家庭用コードレスホンなどでは、音声帯域（３００Ｈｚ〜３ｋＨｚ）のみを含むような狭帯域の音声信号を送受信する通信システムが利用されている。従来、このような狭帯域の通信システムで、比較的安価に秘話性を持たせる技術として、送信機と受信器の両方に平衡変調器を設け、送信機側では周波数を反転させた音声信号を送信し、受信機側では受信した音声を再反転して元に戻す方法が提案されている（例えば、特許文献１および特許文献２参照）。   In a transceiver, a home cordless phone, and the like, a communication system that transmits and receives a narrowband audio signal including only an audio band (300 Hz to 3 kHz) is used. Conventionally, in such a narrow-band communication system, as a technique for providing confidentiality at a relatively low cost, a balanced modulator is provided in both the transmitter and the receiver, and a voice signal whose frequency is inverted is transmitted on the transmitter side. A method has been proposed in which the received voice is re-inverted and restored on the receiver side (see, for example, Patent Document 1 and Patent Document 2).

このような従来の方法によれば、送信機から送信された音声信号を、他の受信器（平衡変調機を持たない受信器）が受信したとしても、その音声信号の周波数が反転されているので、音声の内容を聞き取ることは困難である。従来、狭帯域の通信システムでは、このようにして秘話性が保たれていた。   According to such a conventional method, even if another receiver (a receiver not having a balanced modulator) receives an audio signal transmitted from a transmitter, the frequency of the audio signal is inverted. Therefore, it is difficult to hear the contents of the voice. Conventionally, in a narrow-band communication system, confidentiality is maintained in this way.

特開平２−３７８５２号公報JP-A-2-37852 特開平７−３０７７２１号公報JP-A-7-307721

しかしながら、従来の通信システムは、音声帯域（３００Ｈｚ〜３ｋＨｚ）のみを含むような狭帯域の音声信号しか送受信できないので、オーディオ帯域（１００Ｈｚ〜１５ｋＨｚ）を含むような広帯域の場合に比べて音質が低いという問題があった。   However, since the conventional communication system can transmit and receive only a narrowband audio signal including only the audio band (300 Hz to 3 kHz), the sound quality is lower than that of the wideband including the audio band (100 Hz to 15 kHz). There was a problem.

そこで、音質を高くするために、従来のシステム（狭帯域の通信システム）で用いられていた方法を、広帯域の通信システムにそのまま適用することも考えられる。しかし、単に、従来の方法を広帯域の通信システムに適用しただけでは、狭帯域の通信システムで得られていたような秘話性を得ることはできない。平衡変調後（周波数反転後）の音声信号には、平衡変調器を構成する電子部品の電気的特性がその製造上のばらつきや温度変化等によって理想的な対称性から偏移してしまい、原音声（平衡変調前の音声信号）が「漏れ音声」として含まれる。この「漏れ音声」は、平衡変調後の音声信号の低域側（主に３００Ｈｚ〜３ｋＨｚの音声帯域）に含まれることになる。   Therefore, in order to improve sound quality, it is conceivable to apply the method used in the conventional system (narrowband communication system) to the broadband communication system as it is. However, simply by applying the conventional method to a broadband communication system, it is not possible to obtain the secrecy that was obtained in a narrow band communication system. In an audio signal after balanced modulation (after frequency reversal), the electrical characteristics of the electronic components that make up the balanced modulator are shifted from ideal symmetry due to variations in manufacturing, temperature changes, etc. Audio (audio signal before balanced modulation) is included as “leakage audio”. This “leakage voice” is included in the low frequency side (mainly, the voice band of 300 Hz to 3 kHz) of the voice signal after balanced modulation.

平衡変調後の音声信号の低域側（低周波数側）は、平衡変調前の音声信号の高域側（高周波数側）に対応することになるが、マイクへの入力が主に音声である場合には、原音声（平衡変調前の音声信号）に音声帯域を超えるような高域側の成分は少なく、したがって、平衡変調後の音声信号の低域側の成分も少ない。そのため、送信機から送信された音声信号を、他の受信器（平衡変調機を持たない受信器）が受信した場合に、平衡変調後の音声信号の低域側には、「漏れ音声」以外の成分が少なく、結果として、「漏れ音声」が聞き取りやすくなり、秘話性が保てないという問題がある。   The low frequency side (low frequency side) of the audio signal after balanced modulation corresponds to the high frequency side (high frequency side) of the audio signal before balanced modulation, but the input to the microphone is mainly audio. In some cases, the original sound (the sound signal before the balanced modulation) has few components on the high frequency side exceeding the sound band, and therefore, the low frequency component of the sound signal after the balanced modulation has few. Therefore, when other receivers (receivers that do not have a balanced modulator) receive the audio signal transmitted from the transmitter, the low frequency side of the audio signal after balanced modulation is other than “leakage audio” As a result, there is a problem that it is easy to hear "leakage voice" and the secrecy cannot be maintained.

本発明は、上記従来の問題を解決するためになされたもので、広帯域のシステム（高音質のシステム）でも漏れ音声の音声レベルを低減することができ、秘話性を高めることのできる通信システムを提供することを目的とする。   The present invention has been made in order to solve the above-described conventional problems. A communication system capable of reducing the voice level of leaked voice even in a wideband system (high-quality sound system) and enhancing the secrecy. The purpose is to provide.

本発明の通信システムは、広帯域の音声信号を送受信するための送信装置と受信装置を備えた通信システムにおいて、前記送信装置は、前記広帯域の音声信号が入力される音声入力部と、前記音声信号の周波数を反転させる音声信号周波数反転部と、前記周波数が反転された音声信号に、所定の基準周波数より低い周波数帯域において、前記受信装置において前記送信装置から送信される前記音声信号の個別受信を行うためのＤＣＳ信号、または、前記受信装置において前記送信装置から送信される信号に基づいて所定の動作を行うための動作信号を重畳する信号重畳部と、前記ＤＣＳ信号または前記動作信号が重畳された音声信号を送信する送信部と、を備え、前記受信装置は、前記送信装置から送信された音声信号を受信する受信部と、前記受信した音声信号のうち、前記基準周波数より低い周波数帯域の信号を低減するフィルター部と、前記基準周波数より低い周波数帯域の信号を低減した音声信号の周波数を再反転させる逆反転処理を行う音声信号周波数再反転処理部と、前記周波数が再反転された音声信号を出力する音声出力部と、を備えた構成を有している。   The communication system of the present invention is a communication system including a transmission device and a reception device for transmitting and receiving a wideband audio signal, wherein the transmission device includes an audio input unit to which the wideband audio signal is input, and the audio signal An audio signal frequency inverting unit for inverting the frequency of the audio signal, and receiving the audio signal transmitted from the transmitting device in the receiving device in a frequency band lower than a predetermined reference frequency to the audio signal having the inverted frequency. A signal superimposing unit that superimposes an operation signal for performing a predetermined operation on the basis of a DCS signal to be performed or a signal transmitted from the transmission device in the reception device, and the DCS signal or the operation signal is superimposed A transmission unit that transmits the received audio signal, and the reception device receives the audio signal transmitted from the transmission device; Of the received audio signal, a filter unit that reduces a signal in a frequency band lower than the reference frequency, and an audio that performs reverse inversion processing to reinvert the frequency of the audio signal in which a signal in the frequency band lower than the reference frequency is reduced A signal frequency re-inversion processing unit; and an audio output unit that outputs an audio signal having the frequency re-inverted.

この構成により、送信装置（例えば、マイク装置）で、音声信号の周波数を反転させる音声信号の周波数反転処理が行われ、周波数反転後の音声信号の低域側の帯域（基準周波数より低い周波数帯域）にＤＣＳ信号または動作信号が重畳される。したがって、周波数反転後の音声信号に周波数反転前の音声信号が「漏れ音声」として含まれる場合であっても、その周波数帯域（低域側の帯域）の信号がＤＣＳ信号や動作信号によって聴感上でマスキングされ、一般の受信装置（本発明以外の受信装置）から出力される漏れ音声を聞き取りにくくすることができる。一方、本発明の受信装置では、その周波数帯域（低域側の帯域）の信号が低減されて、音声信号の周波数を再反転させる音声信号周波数再反転処理が行われ、周波数再反転後の音声信号が適切に出力される。このようにして、広帯域のシステム（高音質のシステム）において、漏れ音声をマスキングすることができ、秘話性を高めることができる。   With this configuration, the frequency reversal processing of the audio signal that inverts the frequency of the audio signal is performed in the transmission device (for example, the microphone device), and the low frequency band of the audio signal after the frequency inversion (the frequency band lower than the reference frequency) ) Is superimposed on the DCS signal or the operation signal. Therefore, even when the audio signal after frequency inversion includes the audio signal before frequency inversion as “leakage audio”, the signal in the frequency band (the lower frequency band) is audibly affected by the DCS signal or the operation signal. It is possible to make it difficult to hear the leaked voice that is masked by the above and output from a general receiver (receiver other than the present invention). On the other hand, in the receiving apparatus of the present invention, the signal of the frequency band (the lower band) is reduced, and the audio signal frequency re-inversion process is performed to re-invert the frequency of the audio signal. The signal is output properly. In this way, leaking voice can be masked in a wideband system (high sound quality system), and the secrecy can be improved.

また、本発明の通信システムでは、前記送信装置は、前記周波数が反転された音声信号のうち、前記基準周波数より低い周波数帯域の信号を低減するフィルター部を備え、前記信号重畳部は、前記基準周波数より低い周波数帯域の信号が低減された音声信号に、前記ＤＣＳ信号または前記動作信号を重畳する構成を有している。   In the communication system of the present invention, the transmission device includes a filter unit that reduces a signal in a frequency band lower than the reference frequency among the audio signals having the inverted frequency, and the signal superimposing unit includes the reference signal It has a configuration in which the DCS signal or the operation signal is superimposed on an audio signal in which a signal in a frequency band lower than the frequency is reduced.

この構成により、周波数反転後の音声信号において、低域側の帯域の信号が低減され、ＤＣＳ信号や動作信号を重畳するための周波数帯域が確保される。したがって、ＤＣＳ信号や動作信号を音声信号に重畳するときに、ＤＣＳ信号や動作信号のシグナルノイズ比（Ｓ／Ｎ）を高くすることができる。   With this configuration, in the audio signal after frequency inversion, the signal in the low frequency band is reduced, and the frequency band for superimposing the DCS signal and the operation signal is secured. Therefore, when the DCS signal or the operation signal is superimposed on the audio signal, the signal noise ratio (S / N) of the DCS signal or the operation signal can be increased.

また、本発明の通信システムでは、前記受信装置は、前記受信した音声信号から、前記ＤＣＳ信号または前記動作信号を抽出する抽出部と、前記ＤＣＳ信号に基づいて前記送信装置から受信した前記音声信号を出力するか否かの切替えを行う、または、前記動作信号に基づいて前記送信装置から送信される信号に基づいて前記所定の動作を行う処理部と、を備えた構成を有している。   In the communication system of the present invention, the reception device extracts the DCS signal or the operation signal from the received audio signal, and the audio signal received from the transmission device based on the DCS signal. And a processing unit that performs the predetermined operation based on a signal transmitted from the transmission device based on the operation signal.

この構成により、ＤＣＳ信号に基づいて、送信装置から受信した音声信号を出力するか否かの切替え（スケルチ制御）を、受信装置で行うことが可能になる。あるいは、動作信号に基づいて、送信装置で指示された所定の動作（音量調整や電池残量表示など）を、受信装置で行うことが可能になる。   With this configuration, it is possible to perform switching (squelch control) on whether or not to output the audio signal received from the transmission device based on the DCS signal at the reception device. Alternatively, based on the operation signal, a predetermined operation (volume adjustment, battery remaining amount display, etc.) instructed by the transmission device can be performed by the reception device.

本発明の送信装置は、広帯域の音声信号を送受信するための通信システムで用いられる送信装置であって、前記送信装置は、前記広帯域の音声信号が入力される音声入力部と、前記音声信号の周波数を反転させる音声信号反転部と、前記周波数が反転された音声信号に、所定の基準周波数より低い周波数帯域において、前記受信装置において前記送信装置から送信される前記音声信号の個別受信を行うためのＤＣＳ信号、または、前記受信装置において前記送信装置から送信される信号に基づいて所定の動作を行うための動作信号を重畳する信号重畳部と、前記ＤＣＳ信号または前記動作信号が重畳された音声信号を送信する送信部と、を備え、前記通信システムの受信装置では、前記送信装置から送信された音声信号が受信されると、前記受信した音声信号のうち、前記基準周波数より低い周波数帯域の信号が低減され、前記基準周波数より低い周波数帯域の信号を低減した音声信号の周波数を再反転させる逆反転処理が行われ、前記周波数が再反転された音声信号が出力される構成を有している。   The transmission device of the present invention is a transmission device used in a communication system for transmitting and receiving a wideband audio signal, and the transmission device includes an audio input unit to which the wideband audio signal is input; An audio signal inverting unit that inverts the frequency, and the audio signal that has been inverted in frequency, in order to perform individual reception of the audio signal transmitted from the transmitting device in the receiving device in a frequency band lower than a predetermined reference frequency. A signal superimposing unit that superimposes an operation signal for performing a predetermined operation on the basis of a DCS signal or a signal transmitted from the transmission device in the reception device, and a sound on which the DCS signal or the operation signal is superimposed A transmission unit that transmits a signal, and in the reception device of the communication system, when an audio signal transmitted from the transmission device is received, In the received audio signal, a signal in a frequency band lower than the reference frequency is reduced, and a reverse inversion process is performed to reinvert the frequency of the audio signal in which the signal in the frequency band lower than the reference frequency is reduced. The re-inverted audio signal is output.

この送信装置によっても、上記と同様に、広帯域のシステム（高音質のシステム）において、漏れ音声をマスキングすることができ、秘話性を高めることができる。   Similarly to the above, this transmission apparatus can mask leaked speech in a broadband system (high sound quality system), and can improve the secrecy.

本発明の受信装置は、広帯域の音声信号を送受信するための通信システムで用いられる受信装置であって、前記通信システムの送信装置では、前記広帯域の音声信号が入力されると、前記音声信号の周波数を反転させる音声信号周波数反転処理が行われ、前記周波数が反転された音声信号に、所定の基準周波数より低い周波数帯域において、前記受信装置において前記送信装置から送信される前記音声信号の個別受信を行うためのＤＣＳ信号、または、前記受信装置において前記送信装置から送信される信号に基づいて所定の動作を行うための動作信号が重畳され、前記ＤＣＳ信号または前記動作信号が重畳された音声信号が送信され、前記受信装置は、前記送信装置から送信された音声信号を受信する受信部と、前記受信した音声信号のうち、前記基準周波数より低い周波数帯域の信号を低減するフィルター部と、前記基準周波数より低い周波数帯域の信号を低減した音声信号の周波数を再反転させる逆反転処理を行う音声信号再反転部と、前記周波数が再反転された音声信号を出力する音声出力部と、を備えた構成を有している。   The receiving device of the present invention is a receiving device used in a communication system for transmitting and receiving a wideband audio signal. In the transmitting device of the communication system, when the wideband audio signal is input, Audio signal frequency inversion processing for inverting the frequency is performed, and the audio signal that has been inverted in frequency is individually received by the receiving device from the transmitting device in a frequency band lower than a predetermined reference frequency. Or a voice signal on which the operation signal for performing a predetermined operation is superimposed on the signal transmitted from the transmission device in the reception device, and the DCS signal or the operation signal is superimposed Is transmitted, and the reception device receives a voice signal transmitted from the transmission device, and receives the received voice signal. A filter unit that reduces a signal in a frequency band lower than the reference frequency, an audio signal reinversion unit that performs reverse inversion processing to reinvert the frequency of the audio signal in which a signal in a frequency band lower than the reference frequency is reduced, and And an audio output unit that outputs an audio signal whose frequency is re-inverted.

この受信装置によっても、上記と同様に、広帯域のシステム（高音質のシステム）において、漏れ音声をマスキングすることができ、秘話性を高めることができる。   Also with this receiving apparatus, in the same way as described above, leaked speech can be masked in a broadband system (high sound quality system), and the secrecy can be improved.

本発明の方法は、広帯域の音声信号を送受信するための送信装置と受信装置を備えた通信システムで用いられる通信方法であって、前記送信装置では、前記広帯域の音声信号が入力されると、前記音声信号の周波数を反転させる音声信号周波数反転処理が行われ、前記周波数が反転された音声信号に、所定の基準周波数より低い周波数帯域において、前記受信装置において前記送信装置から送信される前記音声信号の個別受信を行うためのＤＣＳ信号、または、前記受信装置において前記送信装置から送信される信号に基づいて所定の動作を行うための動作信号が重畳され、前記ＤＣＳ信号または前記動作信号が重畳された音声信号が送信され、前記受信装置では、前記送信装置から送信された音声信号が受信されると、前記受信した音声信号のうち、前記基準周波数より低い周波数帯域の信号が低減され、前記基準周波数より低い周波数帯域の信号を低減した音声信号の周波数を再反転させる逆反転処理が行われ、前記周波数が再反転された音声信号が出力される。   The method of the present invention is a communication method used in a communication system including a transmission device and a reception device for transmitting and receiving a wideband audio signal. In the transmission device, when the wideband audio signal is input, The audio signal frequency inversion processing for inverting the frequency of the audio signal is performed, and the audio signal transmitted from the transmitting device in the receiving device in a frequency band lower than a predetermined reference frequency is applied to the audio signal having the inverted frequency. A DCS signal for individual reception of signals or an operation signal for performing a predetermined operation based on a signal transmitted from the transmission device in the reception device is superimposed, and the DCS signal or the operation signal is superimposed. When the received audio signal is transmitted from the transmitting device, the receiving device receives the received audio signal. Among them, the signal in the frequency band lower than the reference frequency is reduced, and the reverse inversion processing is performed to reinvert the frequency of the audio signal in which the signal in the frequency band lower than the reference frequency is reduced, and the frequency is reinverted. An audio signal is output.

この方法によっても、上記と同様に、広帯域のシステム（高音質のシステム）において、漏れ音声をマスキングすることができ、秘話性を高めることができる。   Also by this method, in the same manner as described above, leaked speech can be masked in a broadband system (high sound quality system), and the secrecy can be improved.

本発明は、広帯域のシステム（高音質のシステム）において、受信装置から出力される漏れ音声の音声レベルを低減することができ、秘話性を高めることができるという効果を有する通信システムを提供することができるものである。   The present invention provides a communication system having the effect of reducing the voice level of leaked voice output from a receiving apparatus and enhancing the secrecy in a broadband system (high sound quality system). It is something that can be done.

本発明の実施の形態における送信装置（マイク装置）の構成を示すブロック図The block diagram which shows the structure of the transmission apparatus (microphone apparatus) in embodiment of this invention 本発明の実施の形態における受信装置（スピーカ装置）の構成を示すブロック図The block diagram which shows the structure of the receiver (speaker apparatus) in embodiment of this invention 本発明の実施の形態における送信装置（マイク装置）の動作の説明図Explanatory drawing of operation | movement of the transmitter (microphone apparatus) in embodiment of this invention 本発明の実施の形態における受信装置（スピーカ装置）の動作の説明図Explanatory drawing of operation | movement of the receiver (speaker apparatus) in embodiment of this invention

以下、本発明の実施の形態の通信システムについて、図面を用いて説明する。本実施の形態では、ワイヤレスマイクシステム等に用いられる通信システムの場合を例示する。本実施の形態の通信システムは、送信装置としての機能を有するマイク装置と、受信装置としての機能を有するスピーカ装置とで構成されている。この通信システムでは、広帯域（１００Ｈｚ〜１５ｋＨｚのオーディオ帯域）の音声信号が送受信される。なお、以下の説明では広帯域の音声信号として（１００Ｈｚ〜１５ｋＨｚ）の場合を例に説明するが、下限がない場合（ 〜１５ｋＨｚ）でも同様に実施可能である。   Hereinafter, a communication system according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a case of a communication system used for a wireless microphone system or the like is illustrated. The communication system of the present embodiment includes a microphone device having a function as a transmission device and a speaker device having a function as a reception device. In this communication system, a wideband (100 Hz to 15 kHz audio band) audio signal is transmitted and received. In the following description, the case of a wideband audio signal (100 Hz to 15 kHz) will be described as an example. However, the present invention can be similarly implemented even when there is no lower limit (˜15 kHz).

まず、本発明の実施の形態の通信システムの構成を、図１および図２を参照して説明する。図１は、本実施の形態の通信システムにおける送信装置（マイク装置）の構成を示すブロック図である。図１に示すように、マイク装置１は、音声信号が入力されるマイク２と、入力された音声信号を増幅するＡＦアンプ３と、音声信号に含まれるノイズ周波数成分を低減するバンドパスフィルター（ＢＰＦ）４と、音声信号の周波数を反転させる処理（平衡変調処理）を行う平衡変調器５と、平衡変調処理における変調クロック周波数より高い周波数成分を低減し音声信号の周波数反転成分を取り出すローパスフィルター（ＬＰＦ）６と、所定の基準周波数（例えば、３ｋＨｚ）より低い周波数成分を低減するハイパスフィルタ（ＨＰＦ）７と、音声信号をＦＭ変調するＦＭ変調器８と、アンテナ９から送信する音声信号を増幅するＲＦアンプ１０を備えている。ここでは、マイク２が、本発明の音声入力部に相当し、平衡変調器５が、本発明の音声信号周波数反転部に相当する。また、ＨＰＦ７が、本発明の送信装置のフィルター部に相当し、アンテナ９が、本発明の送信部に相当する。   First, the configuration of a communication system according to an embodiment of the present invention will be described with reference to FIG. 1 and FIG. FIG. 1 is a block diagram showing a configuration of a transmission device (microphone device) in the communication system of the present embodiment. As shown in FIG. 1, a microphone device 1 includes a microphone 2 to which an audio signal is input, an AF amplifier 3 that amplifies the input audio signal, and a bandpass filter that reduces noise frequency components included in the audio signal ( (BPF) 4, a balanced modulator 5 that performs processing (balanced modulation processing) for inverting the frequency of the audio signal, and a low-pass filter that reduces the frequency component higher than the modulation clock frequency in the balanced modulation processing and extracts the frequency inverted component of the audio signal (LPF) 6, a high-pass filter (HPF) 7 that reduces frequency components lower than a predetermined reference frequency (for example, 3 kHz), an FM modulator 8 that FM modulates an audio signal, and an audio signal transmitted from an antenna 9 An RF amplifier 10 for amplification is provided. Here, the microphone 2 corresponds to an audio input unit of the present invention, and the balanced modulator 5 corresponds to an audio signal frequency inverting unit of the present invention. The HPF 7 corresponds to the filter unit of the transmission apparatus of the present invention, and the antenna 9 corresponds to the transmission unit of the present invention.

また、マイク装置１は、音声信号とともに送信されるトーン信号を発振するトーン信号発振器１１と、音声信号とともに送信されるＤＣＳ信号または動作信号を生成する信号生成部１２を備えている。また、マイク装置１は、信号生成部の制御を行うＣＰＵ１３と、所定の動作（音量調整など）を行うためにユーザが操作をする操作部１４とを備えている。トーン信号発振器１１は、生成したトーン信号を、平衡変調後の音声信号に重畳する。また、信号生成部１２は、生成したＤＣＳ信号や動作信号を、平衡変調後の音声信号（ＨＰＦ７により基準周波数より低い周波数帯域の信号が低減された音声信号）に重畳する。ここでは、信号生成部１２が、本発明の信号重畳部に相当する。   The microphone device 1 also includes a tone signal oscillator 11 that oscillates a tone signal that is transmitted together with the audio signal, and a signal generator 12 that generates a DCS signal or an operation signal that is transmitted together with the audio signal. In addition, the microphone device 1 includes a CPU 13 that controls the signal generation unit, and an operation unit 14 that a user operates to perform a predetermined operation (such as volume adjustment). The tone signal oscillator 11 superimposes the generated tone signal on the audio signal after balanced modulation. In addition, the signal generation unit 12 superimposes the generated DCS signal and operation signal on the audio signal after balanced modulation (an audio signal in which a signal in a frequency band lower than the reference frequency is reduced by the HPF 7). Here, the signal generator 12 corresponds to the signal superimposing unit of the present invention.

ＤＣＳ信号は、デジタルコードスケルチ（ＤＣＳ）による個別受信を行うための信号である。ＤＣＳ信号は、ＣＰＵ１３によって制御された信号生成部１２により生成され、平衡変調後の音声信号（ＨＰＦ７により基準周波数より低い周波数帯域の信号が低減された音声信号）に重畳されてスピーカ装置１５へ送信される。スピーカ装置１５では、このＤＣＳ信号に基づいて、マイク装置１から送信された音声信号の個別受信を行うことができる。ＤＣＳ信号の周波数は、ＨＰＦ７の基準周波数より低い周波数（例えば、２５４Ｈｚ）に設定されている。   The DCS signal is a signal for performing individual reception by digital code squelch (DCS). The DCS signal is generated by the signal generator 12 controlled by the CPU 13 and is transmitted to the speaker device 15 by being superimposed on the audio signal after balanced modulation (the audio signal in which the signal in the frequency band lower than the reference frequency is reduced by the HPF 7). Is done. The speaker device 15 can individually receive the audio signal transmitted from the microphone device 1 based on the DCS signal. The frequency of the DCS signal is set to a frequency (for example, 254 Hz) lower than the reference frequency of the HPF 7.

また、動作信号は、マイク装置１で指示された所定の動作（スピーカの音量調整やマ
イクの電池残量表示など）を行うための信号である。動作信号は、操作部１４（または電池残量検知部（図示せず）など）からの入力を受けたＣＰＵ１３が信号生成部１２を制御することにより生成され、平衡変調後の音声信号（ＨＰＦ７により基準周波数より低い周波数帯域の信号が低減された音声信号）に重畳されてスピーカ装置１５へ送信される。スピーカ装置１５では、この動作信号に基づいて、マイク装置１から送信された信号で所定の動作を行うことができる。動作信号の周波数は、ＨＰＦ７の基準周波数より低い周波数（例えば、２５４Ｈｚ）に設定されている。 The operation signal is a signal for performing a predetermined operation (such as adjusting the volume of the speaker or displaying the remaining battery level of the microphone) instructed by the microphone device 1. The operation signal is generated by the CPU 13 receiving the input from the operation unit 14 (or the battery remaining amount detection unit (not shown) or the like) by controlling the signal generation unit 12, and the audio signal (HPF 7) after the balanced modulation. A signal in a frequency band lower than the reference frequency is superimposed on the reduced sound signal) and transmitted to the speaker device 15. The speaker device 15 can perform a predetermined operation with the signal transmitted from the microphone device 1 based on the operation signal. The frequency of the operation signal is set to a frequency (for example, 254 Hz) lower than the reference frequency of the HPF 7.

図２は、本実施の携帯の通信システムにおける受信装置（スピーカ装置１５）の構成を示すブロック図である。図２に示すように、スピーカ装置１５は、アンテナ１６で受信した音声信号を増幅するＲＦアンプ１７と、受信した音声信号をＦＭ復調するＦＭ復調器１８と、所定の基準周波数（例えば、３ｋＨｚ）より低い周波数成分を低減するハイパスフィルタ（ＨＰＦ）１９と、平衡変調処理における変調クロック周波数より高い周波数成分を低減するローパスフィルター（ＬＰＦ）２０と、音声信号の周波数を反転させる処理（平衡変調処理）を行う平衡変調器２１と、平衡変調処理における変調クロック周波数より高い周波数成分を低減し音声信号の周波数再反転成分を取り出すローパスフィルター（ＬＰＦ）３０と、音声信号を増幅するＡＦアンプ２２と、音声信号の出力／非出力を切替えるスケルチ開閉を行うスケルチ制御部２３と、音声信号のボリュームを制御するボリューム制御部２４と、音声信号を出力するスピーカ２５とを備えている。ここでは、アンテナ１６が、本発明の受信部に相当し、ＨＰＦ１９が、本発明の受信装置のフィルター部に相当する。また、スピーカ２５が、本発明の音声出力部に相当する。   FIG. 2 is a block diagram showing a configuration of a receiving device (speaker device 15) in the portable communication system of the present embodiment. As shown in FIG. 2, the speaker device 15 includes an RF amplifier 17 that amplifies the audio signal received by the antenna 16, an FM demodulator 18 that FM-demodulates the received audio signal, and a predetermined reference frequency (for example, 3 kHz). A high-pass filter (HPF) 19 for reducing lower frequency components, a low-pass filter (LPF) 20 for reducing frequency components higher than the modulation clock frequency in balanced modulation processing, and processing for inverting the frequency of the audio signal (balanced modulation processing) , A low-pass filter (LPF) 30 that extracts a frequency reinversion component of the audio signal by reducing a frequency component higher than the modulation clock frequency in the balanced modulation processing, an AF amplifier 22 that amplifies the audio signal, and audio A squelch control unit 23 for opening / closing a squelch that switches between output and non-output of a signal; A volume control unit 24 for controlling the volume, and a speaker 25 for outputting audio signals. Here, the antenna 16 corresponds to the receiving unit of the present invention, and the HPF 19 corresponds to the filter unit of the receiving apparatus of the present invention. The speaker 25 corresponds to an audio output unit of the present invention.

なお、このスピーカ装置１５の平衡変調器２１で行われる平衡変調処理は、すでに周波数が反転されている音声信号（マイク装置１の平衡変調器５で周波数が反転された音声信号）の周波数を再反転するものである。したがって、スピーカ装置１５の平衡変調器２１で行われる平衡変調処理は、逆平衡変調処理と呼ぶこともできる。このスピーカ装置１５の平衡変調器２１が、本発明の音声信号周波数再反転部に相当する。   Note that the balanced modulation processing performed by the balanced modulator 21 of the speaker device 15 is performed again on the frequency of an audio signal whose frequency has already been inverted (an audio signal whose frequency has been inverted by the balanced modulator 5 of the microphone device 1). It will be reversed. Therefore, the balanced modulation process performed by the balanced modulator 21 of the speaker device 15 can also be referred to as an inverse balanced modulation process. The balanced modulator 21 of the speaker device 15 corresponds to the audio signal frequency re-inversion unit of the present invention.

また、スピーカ装置１５は、無信号時の雑音（ノイズ）を遮断するノイズスケルチを行うためのノイズスケルチ部２６と、ＦＭ復調された音声信号からＤＣＳ信号や動作信号を抽出する信号抽出部２７と、抽出されたＤＣＳ信号や動作信号が送られるＣＰＵ２８を備えている。さらに、このスピーカ装置１５は、マイク装置１の電池残量などを表示するための表示部２９を備えている。   In addition, the speaker device 15 includes a noise squelch unit 26 for performing noise squelch that blocks noise at the time of no signal, and a signal extraction unit 27 that extracts a DCS signal and an operation signal from the FM demodulated audio signal. The CPU 28 to which the extracted DCS signal and operation signal are sent is provided. Further, the speaker device 15 includes a display unit 29 for displaying the battery remaining amount of the microphone device 1 and the like.

信号抽出部２７で抽出されたＤＣＳ信号は、ＣＰＵ２８からスケルチ制御部２３に送られて、データコードスケルチによる個別受信を行うのに用いられる。すなわち、スケルチ制御部２３は、音声信号からＤＣＳ信号が抽出されているときには、スケルチを開いて音声信号を出力する(音声信号出力を行う場合をスケルチＯＦＦまたはスケルチ開くといい、音声信号出力を行わない場合をスケルチＯＮまたはスケルチ閉じるという)。一方、スケルチ制御部２３は、音声信号からＤＣＳ信号が抽出されていないときには、スケルチを閉じて音声信号を出力しない。この場合、ＣＰＵ２８やスケルチ制御部２３が、本発明の処理部に相当する。   The DCS signal extracted by the signal extraction unit 27 is sent from the CPU 28 to the squelch control unit 23 and used for individual reception by data code squelch. That is, when the DCS signal is extracted from the audio signal, the squelch control unit 23 opens the squelch and outputs the audio signal (when the audio signal is output, the squelch is OFF or the squelch is opened, and the audio signal is output. If there is no squelch ON or squelch close). On the other hand, when the DCS signal is not extracted from the audio signal, the squelch control unit 23 closes the squelch and does not output the audio signal. In this case, the CPU 28 and the squelch control unit 23 correspond to the processing unit of the present invention.

また、信号抽出部２７で抽出された動作信号は、スピーカ装置１５において各種の動作を行うのに用いられる。例えば、音量調整用の動作信号は、ＣＰＵ２８からボリューム制御部２４に送られて、音量調整（ボリューム調整）の制御を行うのに用いられる。また、電池残量表示用の動作信号は、ＣＰＵ２８から表示部２９に送られて、マイク装置１の電池残量の表示を行うのに用いられる。なお、スピーカ装置１５において行われる各種の動作は、音量調整や電池残量表示に限られず、例えば、接点出力などであってもよい。この場合、ＣＰＵ２８やボリューム制御部２４が、本発明の処理部に相当する。   Further, the operation signal extracted by the signal extraction unit 27 is used to perform various operations in the speaker device 15. For example, an operation signal for volume adjustment is sent from the CPU 28 to the volume control unit 24 and used to control volume adjustment (volume adjustment). Further, an operation signal for displaying the remaining battery level is sent from the CPU 28 to the display unit 29 and used to display the remaining battery level of the microphone device 1. The various operations performed in the speaker device 15 are not limited to volume adjustment and battery remaining amount display, and may be, for example, contact output. In this case, the CPU 28 and the volume control unit 24 correspond to the processing unit of the present invention.

以上のように構成された通信システム１について、図面を参照してその動作を説明する。   The operation of the communication system 1 configured as described above will be described with reference to the drawings.

図３は、本実施の形態のマイク装置１の動作の説明図である。図３に示すように、本実施の形態のマイク装置１では、主音声帯域（３００Ｈｚ〜３ｋＨｚ）を含むような広帯域の音声信号がマイク２から入力されると（図３（ａ）参照）、その音声信号の周波数を反転する平衡変調処理がなされる（図３（ｂ）参照）。平衡変調後の音声信号の低域側の部分（音声帯域の部分）には、漏れ音声が含まれることがあるが、本実施の形態では、この低域側の部分（漏れ音声を含んだ部分）がＨＰＦ１９で低減され（図３（ｃ）参照）、代わりに、ＤＣＳ信号や動作信号が重畳された音声信号が送信される（図３（ｄ）参照）。   FIG. 3 is an explanatory diagram of the operation of the microphone device 1 of the present embodiment. As shown in FIG. 3, in the microphone device 1 according to the present embodiment, when a wide-band audio signal including the main audio band (300 Hz to 3 kHz) is input from the microphone 2 (see FIG. 3A). A balanced modulation process for inverting the frequency of the audio signal is performed (see FIG. 3B). The low frequency side portion (sound band portion) of the audio signal after balanced modulation may contain leaked speech. In this embodiment, this low frequency portion (the portion including leaked speech) ) Is reduced by the HPF 19 (see FIG. 3C), and instead, a voice signal on which a DCS signal and an operation signal are superimposed is transmitted (see FIG. 3D).

図４は、本実施の形態のスピーカ装置１５の動作の説明図である。図４に示すように、本実施の形態のスピーカ装置１５では、マイク装置１から送信された音声信号を受信すると（図４（ａ）参照）、その音声信号の低域側の部分（ＤＣＳ信号や動作信号が重畳された部分）が低減され（図４（ｂ）参照）、その後、音声信号の周波数を反転（再反転）する平衡変調処理（逆平衡変調処理）がなされて（図４（ｃ）参照）、スピーカ２５から音声として出力される。   FIG. 4 is an explanatory diagram of the operation of the speaker device 15 of the present embodiment. As shown in FIG. 4, when the speaker device 15 according to the present embodiment receives an audio signal transmitted from the microphone device 1 (see FIG. 4A), the low frequency side portion of the audio signal (DCS signal) And the portion where the operation signal is superimposed (see FIG. 4B), and then balanced modulation processing (inverse balanced modulation processing) for inverting (re-inverting) the frequency of the audio signal is performed (FIG. 4 ( c), and output as sound from the speaker 25.

このような本実施の形態の通信システムによれば、広帯域のシステム（高音質のシステム）において、スピーカ装置１５から出力される漏れ音声の音声レベルを低減することができ、秘話性を高めることができる。   According to such a communication system of the present embodiment, in a wide band system (high sound quality system), it is possible to reduce the sound level of leaked sound output from the speaker device 15 and to improve the secrecy. it can.

すなわち、本実施の形態では、マイク装置１で、音声信号の周波数を反転させる平衡変調処理が行われ、平衡変調後（周波数反転後）の音声信号の低域側の帯域（基準周波数より低い周波数帯域）にＤＣＳ信号または動作信号が重畳される。したがって、平衡変調後（周波数反転後）の音声信号に平衡変調前（周波数反転前）の音声信号が「漏れ音声」として含まれる場合であっても、その周波数帯域（低域側の帯域）の信号がＤＣＳ信号や動作信号によって聴感上でマスキングされ、一般のスピーカ装置１５（本発明以外のスピーカ装置１５）から出力される漏れ音声を聞き取りにくくすることができる。一方、本実施の形態のスピーカ装置１５では、その周波数帯域（低域側の帯域）の信号が低減されて、音声信号の周波数を再反転させる逆平衡変調処理が行われ、逆平衡変調後（周波数再反転後）の音声信号が適切に出力される。このようにして、広帯域のシステム（高音質のシステム）において、漏れ音声をマスキングすることができ、秘話性を高めることができる。   That is, in the present embodiment, the microphone device 1 performs balanced modulation processing for inverting the frequency of the audio signal, and the low frequency band (frequency lower than the reference frequency) of the audio signal after balanced modulation (after frequency inversion). DCS signal or operation signal is superimposed on (band). Therefore, even if the audio signal before balanced modulation (before frequency inversion) is included as “leakage audio” in the audio signal after balanced modulation (after frequency inversion), the frequency band (the lower frequency band) The signal is masked on the audibility by the DCS signal or the operation signal, and it is possible to make it difficult to hear the leaked sound output from the general speaker device 15 (the speaker device 15 other than the present invention). On the other hand, in the speaker device 15 of the present embodiment, the signal in the frequency band (the lower frequency band) is reduced, and the inverse balanced modulation process is performed to reinvert the frequency of the audio signal. The sound signal after frequency re-inversion is appropriately output. In this way, leaking voice can be masked in a wideband system (high sound quality system), and the secrecy can be improved.

また、本実施の形態では、平衡変調後（周波数反転後）の音声信号において、低域側の帯域の信号が低減され、ＤＣＳ信号や動作信号を重畳するための周波数帯域が確保される。したがって、ＤＣＳ信号や動作信号を音声信号に重畳するときに、ＤＣＳ信号や動作信号のシグナルノイズ比（Ｓ／Ｎ）を高くすることができる。   Further, in the present embodiment, in the audio signal after balanced modulation (after frequency inversion), the signal in the low frequency band is reduced and the frequency band for superimposing the DCS signal and the operation signal is secured. Therefore, when the DCS signal or the operation signal is superimposed on the audio signal, the signal noise ratio (S / N) of the DCS signal or the operation signal can be increased.

また、本実施の形態では、ＤＣＳ信号に基づいて、マイク装置１から受信した音声信号を出力するか否かの切替え（スケルチ制御）を、スピーカ装置１５で行うことが可能になる。あるいは、動作信号に基づいて、マイク装置１で指示された所定の動作（音量調整や電池残量表示など）を、スピーカ装置１５で行うことが可能になる。   In the present embodiment, the speaker device 15 can perform switching (squelch control) as to whether or not to output the audio signal received from the microphone device 1 based on the DCS signal. Alternatively, the speaker device 15 can perform a predetermined operation (volume adjustment, battery remaining amount display, etc.) instructed by the microphone device 1 based on the operation signal.

以上、本発明の実施の形態を例示により説明したが、本発明の範囲はこれらに限定されるものではなく、請求項に記載された範囲内において目的に応じて変更・変形することが可能である。   The embodiments of the present invention have been described above by way of example, but the scope of the present invention is not limited to these embodiments, and can be changed or modified according to the purpose within the scope of the claims. is there.

以上のように、本発明にかかる通信システムは、広帯域のシステム（高音質のシステム）において、受信装置から出力される漏れ音声の音声レベルを低減することができ、秘話性を高めることができるという効果を有し、ワイヤレスマイクシステム等として有用である。   As described above, the communication system according to the present invention can reduce the sound level of leaked sound output from the receiving device in a wideband system (high sound quality system), and can improve the secrecy. It has an effect and is useful as a wireless microphone system or the like.

１ マイク装置
２ マイク
３ ＡＦアンプ
４ バンドパスフィルター（ＢＰＦ）
５ 平衡変調器
６ ローパスフィルター（ＬＰＦ）
７ ハイパスフィルタ（ＨＰＦ）
８ ＦＭ変調器
９ アンテナ
１０ ＲＦアンプ
１１ トーン信号発振器
１２ 信号生成部
１３ ＣＰＵ
１４ 操作部
１５ スピーカ装置
１６ アンテナ
１７ ＲＦアンプ
１８ ＦＭ復調器
１９ ハイパスフィルタ（ＨＰＦ）
２０ ローパスフィルター（ＬＰＦ）
２１ 平衡変調器
２２ ＡＦアンプ
２３ スケルチ制御部
２４ ボリューム制御部
２５ スピーカ
２６ ノイズスケルチ部
２７ 信号抽出部
２８ ＣＰＵ
２９ 表示部
３０ ＬＰＦ DESCRIPTION OF SYMBOLS 1 Microphone apparatus 2 Microphone 3 AF amplifier 4 Band pass filter (BPF)
5 Balanced modulator 6 Low pass filter (LPF)
7 High-pass filter (HPF)
8 FM modulator 9 Antenna 10 RF amplifier 11 Tone signal oscillator 12 Signal generator 13 CPU
DESCRIPTION OF SYMBOLS 14 Operation part 15 Speaker apparatus 16 Antenna 17 RF amplifier 18 FM demodulator 19 High pass filter (HPF)
20 Low pass filter (LPF)
21 balanced modulator 22 AF amplifier 23 squelch control unit 24 volume control unit 25 speaker 26 noise squelch unit 27 signal extraction unit 28 CPU
29 Display 30 LPF

Claims (6)

広帯域の音声信号を送受信するための送信装置と受信装置を備えた通信システムにおいて、
前記送信装置は、
前記広帯域の音声信号が入力される音声入力部と、
前記音声信号の周波数を反転させる音声信号周波数反転部と、
前記周波数が反転された音声信号に、所定の基準周波数より低い周波数帯域において、前記受信装置において前記送信装置から送信される前記音声信号の個別受信を行うためのＤＣＳ信号、または、前記受信装置において前記送信装置から送信される信号に基づいて所定の動作を行うための動作信号を重畳する信号重畳部と、
前記ＤＣＳ信号または前記動作信号が重畳された音声信号を送信する送信部と、
を備え、
前記受信装置は、
前記送信装置から送信された音声信号を受信する受信部と、
前記受信した音声信号のうち、前記基準周波数より低い周波数帯域の信号を低減するフィルター部と、
前記基準周波数より低い周波数帯域の信号を低減した音声信号の周波数を再反転させる逆反転処理を行う音声信号周波数再反転部と、
前記周波数が再反転された音声信号を出力する音声出力部と、
を備えたことを特徴とする通信システム。 In a communication system including a transmission device and a reception device for transmitting and receiving a wideband audio signal,
The transmitter is
An audio input unit to which the broadband audio signal is input;
An audio signal frequency inverting unit for inverting the frequency of the audio signal;
In the frequency band lower than a predetermined reference frequency, the DCS signal for performing individual reception of the audio signal transmitted from the transmission device in the reception device or the reception device in the frequency signal whose frequency is inverted A signal superimposing unit that superimposes an operation signal for performing a predetermined operation based on a signal transmitted from the transmission device;
A transmission unit that transmits the DCS signal or the audio signal on which the operation signal is superimposed;
With
The receiving device is:
A receiver that receives the audio signal transmitted from the transmitter;
A filter unit that reduces a signal in a frequency band lower than the reference frequency among the received audio signals;
An audio signal frequency re-inversion unit that performs reverse inversion processing to re-invert the frequency of the audio signal in which the frequency band signal lower than the reference frequency is reduced
An audio output unit that outputs an audio signal having the frequency re-inverted;
A communication system comprising: 前記送信装置は、前記周波数が反転された音声信号のうち、前記基準周波数より低い周波数帯域の信号を低減するフィルター部を備え、
前記信号重畳部は、前記基準周波数より低い周波数帯域の信号が低減された音声信号に、前記ＤＣＳ信号または前記動作信号を重畳することを特徴とする請求項１に記載の通信システム。 The transmission device includes a filter unit that reduces a signal in a frequency band lower than the reference frequency among audio signals with the frequency inverted,
The communication system according to claim 1, wherein the signal superimposing unit superimposes the DCS signal or the operation signal on an audio signal in which a signal in a frequency band lower than the reference frequency is reduced. 前記受信装置は、
前記受信した音声信号から、前記ＤＣＳ信号または前記動作信号を抽出する抽出部と、
前記ＤＣＳ信号に基づいて前記送信装置から受信した前記音声信号を出力するか否かの切替えを行う、または、前記動作信号に基づいて前記送信装置から送信される信号に基づいて前記所定の動作を行う処理部と、
を備えたことを特徴とする請求項１または請求項２に記載の通信システム。 The receiving device is:
An extraction unit for extracting the DCS signal or the operation signal from the received audio signal;
Switching whether to output the audio signal received from the transmission device based on the DCS signal, or performing the predetermined operation based on a signal transmitted from the transmission device based on the operation signal. A processing unit to perform,
The communication system according to claim 1 or 2, further comprising: 広帯域の音声信号を送受信するための通信システムで用いられる送信装置であって、
前記送信装置は、
前記広帯域の音声信号が入力される音声入力部と、
前記音声信号の周波数を反転させる音声信号反転部と、
前記周波数が反転された音声信号に、所定の基準周波数より低い周波数帯域において、前記受信装置において前記送信装置から送信される前記音声信号の個別受信を行うためのＤＣＳ信号、または、前記受信装置において前記送信装置から送信される信号に基づいて所定の動作を行うための動作信号を重畳する信号重畳部と、
前記ＤＣＳ信号または前記動作信号が重畳された音声信号を送信する送信部と、
を備え、
前記通信システムの受信装置では、前記送信装置から送信された音声信号が受信されると、前記受信した音声信号のうち、前記基準周波数より低い周波数帯域の信号が低減され、前記基準周波数より低い周波数帯域の信号を低減した音声信号の周波数を再反転させる逆反転処理が行われ、前記周波数が再反転された音声信号が出力されることを特徴とする送信装置。 A transmission device used in a communication system for transmitting and receiving a broadband audio signal,
The transmitter is
An audio input unit to which the broadband audio signal is input;
An audio signal inverting unit for inverting the frequency of the audio signal;
In the frequency band lower than a predetermined reference frequency, the DCS signal for performing individual reception of the audio signal transmitted from the transmission device in the reception device or the reception device in the frequency signal whose frequency is inverted A signal superimposing unit that superimposes an operation signal for performing a predetermined operation based on a signal transmitted from the transmission device;
A transmission unit that transmits the DCS signal or the audio signal on which the operation signal is superimposed;
With
In the receiving device of the communication system, when the audio signal transmitted from the transmitting device is received, the signal in the frequency band lower than the reference frequency is reduced among the received audio signals, and the frequency lower than the reference frequency. A transmitting apparatus, wherein reverse inversion processing is performed to reinvert the frequency of an audio signal whose band signal is reduced, and the audio signal with the frequency reinverted is output. 広帯域の音声信号を送受信するための通信システムで用いられる受信装置であって、
前記通信システムの送信装置では、前記広帯域の音声信号が入力されると、前記音声信号の周波数を反転させる音声信号周波数反転処理が行われ、前記周波数が反転された音声信号に、所定の基準周波数より低い周波数帯域において、前記受信装置において前記送信装置から送信される前記音声信号の個別受信を行うためのＤＣＳ信号、または、前記受信装置において前記送信装置から送信される信号に基づいて所定の動作を行うための動作信号が重畳され、前記ＤＣＳ信号または前記動作信号が重畳された音声信号が送信され、
前記受信装置は、
前記送信装置から送信された音声信号を受信する受信部と、
前記受信した音声信号のうち、前記基準周波数より低い周波数帯域の信号を低減するフィルター部と、
前記基準周波数より低い周波数帯域の信号を低減した音声信号の周波数を再反転させる逆反転処理を行う音声信号再反転部と、
前記周波数が再反転された音声信号を出力する音声出力部と、
を備えたことを特徴とする受信装置。 A receiving device used in a communication system for transmitting and receiving a broadband audio signal,
In the transmission apparatus of the communication system, when the broadband audio signal is input, an audio signal frequency inversion process for inverting the frequency of the audio signal is performed, and the audio signal with the inverted frequency is subjected to a predetermined reference frequency. In a lower frequency band, a predetermined operation based on a DCS signal for performing individual reception of the audio signal transmitted from the transmission device in the reception device or a signal transmitted from the transmission device in the reception device The operation signal for performing the operation is superimposed, and the DCS signal or the audio signal on which the operation signal is superimposed is transmitted,
The receiving device is:
A receiver that receives the audio signal transmitted from the transmitter;
A filter unit that reduces a signal in a frequency band lower than the reference frequency among the received audio signals;
An audio signal re-inversion unit that performs reverse inversion processing to re-invert the frequency of the audio signal in which the frequency band signal lower than the reference frequency is reduced;
An audio output unit that outputs an audio signal having the frequency re-inverted;
A receiving apparatus comprising: 広帯域の音声信号を送受信するための送信装置と受信装置を備えた通信システムで用いられる通信方法であって、
前記送信装置では、音声信号が入力されると、前記音声信号の周波数を反転させる音声信号周波数反転処理が行われ、前記周波数が反転された音声信号に、所定の基準周波数より低い周波数帯域において、前記受信装置において前記送信装置から送信される前記音声信号の個別受信を行うためのＤＣＳ信号、または、前記受信装置において前記送信装置から送信される信号に基づいて所定の動作を行うための動作信号が重畳され、前記ＤＣＳ信号または前記動作信号が重畳された音声信号が送信され、
前記受信装置では、前記送信装置から送信された音声信号が受信されると、前記受信した音声信号のうち、前記基準周波数より低い周波数帯域の信号が低減され、前記基準周波数より低い周波数帯域の信号を低減した音声信号の周波数を再反転させる逆反転処理が行われ、前記周波数が再反転された音声信号が出力されることを特徴とする通信方法。 A communication method used in a communication system including a transmission device and a reception device for transmitting and receiving a broadband audio signal,
In the transmission device, when an audio signal is input, an audio signal frequency inversion process for inverting the frequency of the audio signal is performed, and the audio signal having the inverted frequency is subjected to a frequency band lower than a predetermined reference frequency. A DCS signal for individually receiving the audio signal transmitted from the transmitting device in the receiving device, or an operation signal for performing a predetermined operation based on a signal transmitted from the transmitting device in the receiving device Is transmitted, and the audio signal on which the DCS signal or the operation signal is superimposed is transmitted,
In the receiving device, when the audio signal transmitted from the transmitting device is received, a signal in a frequency band lower than the reference frequency is reduced in the received audio signal, and a signal in a frequency band lower than the reference frequency is reduced. The communication method is characterized in that reverse inversion processing is performed to re-invert the frequency of the audio signal with reduced frequency, and the audio signal with the frequency re-inverted is output.
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