JPH04311117A - Voice signal communication system - Google Patents

Voice signal communication system

Info

Publication number
JPH04311117A
JPH04311117A JP7785091A JP7785091A JPH04311117A JP H04311117 A JPH04311117 A JP H04311117A JP 7785091 A JP7785091 A JP 7785091A JP 7785091 A JP7785091 A JP 7785091A JP H04311117 A JPH04311117 A JP H04311117A
Authority
JP
Japan
Prior art keywords
signal
voice signal
transmitting
delay
audio signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7785091A
Other languages
Japanese (ja)
Inventor
Shinko Tada
多田 真弘
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP7785091A priority Critical patent/JPH04311117A/en
Publication of JPH04311117A publication Critical patent/JPH04311117A/en
Pending legal-status Critical Current

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  • Transceivers (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

PURPOSE:To reproduce a voice signal without generating cut off of the head of speaking on the receiving side at the time of switching transmission by transmitting coded voice signal after applying a delay equipment to a time required for synchronization establishment to the coded voice signal on the transmitting side. CONSTITUTION:A voice signal digitally coded by a coding circuit 2 is temporarily stored in a memory buffer circuit 5, and after the lapse of a delay time previously set by a delay time setting circuit 6 the stored voice signal is sent to a modulator 7. A synchronizing flag signal is inserted into the delay time. The synchronizing flag signal indicates the start of the coded voice signal after the lapse of a prescribed time from the end of the signal. The transmitting signal modulated by the modulator 7 is sent to an output amplifier 8 and power- amplified and the amplified signal is radiated from an antenna 9 to air. Since the output of the coded voice signal is delayed on the transmitting system side A only by the time required for the synchronization establishment on the receiving system side B, the voice signal can be reproduced without generating cut off of the head of speaking on the receiving system side B.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】この発明は、デジタル符号化した
音声信号を無線電話、衛星通信等で伝送する音声信号通
信システムに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal communication system for transmitting digitally encoded audio signals by radio telephone, satellite communication, etc.

【0002】0002

【従来の技術】従来、無線通信における音声信号の伝送
はAM変調、FM変調等の変調技術を用いて行われてき
た。近年、デジタル信号伝送技術の発展に伴い、音声信
号をデジタル符号化して伝送する無線通信も利用される
ようになっていた。
2. Description of the Related Art Conventionally, audio signals in wireless communication have been transmitted using modulation techniques such as AM modulation and FM modulation. In recent years, with the development of digital signal transmission technology, wireless communication that digitally encodes and transmits audio signals has also come into use.

【0003】しかし、プレストーク方式やボイスコント
ロールと称される通話時だけ変調波を送信する通信方式
の場合、送信側で受信状態から送信状態に移る際に、受
信側における変調信号の復調、符号化同期信号の再生に
時間を要してしまう。この場合、音声信号の話頭切断が
発生することが多い。このため、例えばプレストーク方
式では、プレストーク後、一定のブレイク期間をおいて
から会話を開始する等の処理が必要であった。
However, in the case of communication systems that transmit modulated waves only during calls, such as the press-talk system or voice control, when the transmitting side shifts from the receiving state to the transmitting state, the demodulation and coding of the modulated signal on the receiving side is It takes time to reproduce the synchronization signal. In this case, truncations at the beginning of the audio signal often occur. For this reason, for example, in the press talk system, it is necessary to start the conversation after a certain break period after the press talk.

【0004】0004

【発明が解決しようとする課題】以上のべたように、従
来の音声信号通信システムでは、変調信号の復調、符号
化同期信号の再生に時間を要し、音声信号の話頭切断が
発生するという欠点があった。
[Problems to be Solved by the Invention] As described above, in the conventional voice signal communication system, it takes time to demodulate the modulated signal and reproduce the coded synchronization signal, and the disadvantage is that the beginning of the voice signal is cut off. was there.

【0005】この発明は上記の欠点を解決するためにな
されたもので、送信切換の際に、受信側で話頭切断を生
じることなく音声信号を再生できる音声信号通信システ
ムを提供することを目的とする。
[0005] This invention was made to solve the above-mentioned drawbacks, and an object of the present invention is to provide an audio signal communication system that can reproduce audio signals without cutting off the beginning of speech on the receiving side when switching transmission. do.

【0006】[0006]

【課題を解決するための手段】上記目的を達成するため
にこの発明は、デジタル符号化された音声信号を送受信
する音声信号通信システムにおいて、受信状態から送信
状態に切り替わる際に、送信側で同期確立に要する時間
相当の遅延を前記符号化音声信号に与えてから送信する
送信遅延手段と、送信状態から受信状態に切り替わる際
に、前記遅延時間内に受信信号の同期を確立する同期化
手段とを具備して構成される。
[Means for Solving the Problems] In order to achieve the above object, the present invention provides an audio signal communication system that transmits and receives digitally encoded audio signals. a transmission delay means that applies a delay equivalent to the time required for establishment to the encoded audio signal before transmitting it; and a synchronization means that establishes synchronization of the received signal within the delay time when switching from the transmission state to the reception state. It is composed of:

【0007】[0007]

【作用】上記構成による音声信号通信システムでは、送
信側で受信側における同期確立に要する時間相当だけ、
符号化音声信号の出力を遅延するようにしているので、
受信側で話頭前に同期が確立され、これによって話頭切
断を生じることなく音声信号を再生することができる。
[Operation] In the audio signal communication system with the above configuration, the time required for establishing synchronization on the transmitting side and on the receiving side is
Since the output of the encoded audio signal is delayed,
On the receiving side, synchronization is established before the beginning of a speech, thereby making it possible to reproduce the audio signal without cutting off the beginning of a speech.

【0008】[0008]

【実施例】以下、図1及び図2を参照してこの発明の一
実施例を説明する。図1はその構成を示すもので、Aは
送信系、Bは受信系である。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows its configuration, where A is a transmitting system and B is a receiving system.

【0009】送信系Aにおいて、マイクロホン1から入
力された音声信号は、PCM、ADPCM等の符号化回
路2に送られ、デジタル符号化される。通話開始時(受
信状態から送信状態に切り替わった時)には、ボイスコ
ントロールスイッチ3あるいはプレストークスイッチ4
がオン状態に設定され、送信切換信号が発生される。
In the transmission system A, the audio signal input from the microphone 1 is sent to an encoding circuit 2 such as PCM or ADPCM, where it is digitally encoded. When starting a call (when switching from receiving state to transmitting state), press voice control switch 3 or press talk switch 4.
is set to the on state, and a transmission switching signal is generated.

【0010】符号化回路2でデジタル符号化された音声
信号はメモリバッファ回路5にいったん記憶され、遅延
時間設定回路6によって予め設定された遅延時間を経過
してから変調器7に送られる。この際、遅延期間内には
同期フラグ信号が挿入される。この同期フラグ信号はそ
の終了後、所定時間後に符号化された音声信号が開始さ
れることを示すものである。変調器7で変調された送信
信号は出力増幅器8に送られ、ここで電力増幅されてア
ンテナ9から空中へ放射される。尚、上記遅延時間設定
回路6、変調器7、出力増幅器8は送信切換信号によっ
て送信形態に切換設定される。
The audio signal digitally encoded by the encoding circuit 2 is temporarily stored in the memory buffer circuit 5, and is sent to the modulator 7 after a delay time preset by the delay time setting circuit 6 has elapsed. At this time, a synchronization flag signal is inserted within the delay period. This synchronization flag signal indicates that the encoded audio signal will start a predetermined time after the end of the synchronization flag signal. The transmission signal modulated by the modulator 7 is sent to the output amplifier 8, where the power is amplified and radiated into the air from the antenna 9. The delay time setting circuit 6, modulator 7, and output amplifier 8 are switched to a transmission mode by a transmission switching signal.

【0011】受信系Bにおいて、アンテナ10で捕捉し
た受信信号は低雑音増幅器(LNA)11で増幅された
後、復調器12で復調される。この復調信号は分離回路
13に送られる。この分離回路13は入力した復調信号
を同期フラグ信号部分とデジタル音声信号部分とに分離
するもので、同期フラグ信号は同期化回路14に送られ
、デジタル音声信号はデコーダ15によってアナログ形
式に変換される。この際、デコーダ15は同期化回路1
4により変換クロックとデジタル音声信号との同期処理
がなされる。上記デコーダ15の出力は音声再生回路1
6に送られ、音響再生される。上記構成において、以下
、図2を参照してその動作を説明する。
In receiving system B, a received signal captured by an antenna 10 is amplified by a low noise amplifier (LNA) 11 and then demodulated by a demodulator 12. This demodulated signal is sent to the separation circuit 13. This separation circuit 13 separates the input demodulated signal into a synchronization flag signal part and a digital audio signal part.The synchronization flag signal is sent to the synchronization circuit 14, and the digital audio signal is converted into an analog format by a decoder 15. Ru. At this time, the decoder 15
4, the conversion clock and the digital audio signal are synchronized. The output of the decoder 15 is the audio reproduction circuit 1
6 and is played back acoustically. The operation of the above configuration will be described below with reference to FIG.

【0012】今、送信系Aにおいて、送信開始が指示さ
れ、マイクロホン1から図2(a)に示すような音声信
号が入力されたとする。この音声信号は符号化回路2に
よって同図(b)に示すようなパルス列のデジタル符号
化信号に変換され、メモリバッファ回路5に記憶される
Now, assume that the transmission system A is instructed to start transmission, and an audio signal as shown in FIG. 2(a) is input from the microphone 1. This audio signal is converted by the encoding circuit 2 into a pulse train digitally encoded signal as shown in FIG. 2(b), and is stored in the memory buffer circuit 5.

【0013】一方、送信開始時にはプレストークスイッ
チ4がオンされ、あるいは音声信号の入力開始によって
ボイスコントロールスイッチ3がオンされ、これによっ
て送信開始信号が発生される。この送信開始信号により
、遅延時間設定回路6、変調器7、出力増幅器8は送信
形態に切換設定される。
On the other hand, at the start of transmission, the press talk switch 4 is turned on, or the voice control switch 3 is turned on when inputting a voice signal starts, thereby generating a transmission start signal. By this transmission start signal, the delay time setting circuit 6, modulator 7, and output amplifier 8 are switched to the transmission mode.

【0014】符号化回路2でデジタル符号化された音声
信号はメモリバッファ回路5にいったん記憶され、図2
(c)に示すように、遅延時間設定回路6によって予め
設定された遅延時間Tdを経過した後に読み出される。 この際、遅延期間Td内には同図に示すように同期フラ
グ信号が挿入される。
The audio signal digitally encoded by the encoding circuit 2 is temporarily stored in the memory buffer circuit 5, as shown in FIG.
As shown in (c), the data is read out after the delay time Td preset by the delay time setting circuit 6 has elapsed. At this time, a synchronization flag signal is inserted within the delay period Td as shown in the figure.

【0015】上記のように遅延された符号化信号は、図
2(d)に示すように、変調器7で変調され、搬送波に
乗せられて送信信号となる。この送信信号は出力増幅器
8で電力増幅されてアンテナ9から空中へ放射される。
[0015] The encoded signal delayed as described above is modulated by a modulator 7 and placed on a carrier wave to become a transmission signal, as shown in FIG. 2(d). This transmission signal is power amplified by an output amplifier 8 and radiated into the air from an antenna 9.

【0016】したがって、上記構成による音声信号通信
システムは、送信系A側で受信系B側における同期確立
に要する時間相当だけ、符号化音声信号の出力を遅延す
るようにしているので、受信系Bで話頭切断を生じるこ
となく音声信号を再生することができる。この際、送信
系A側で同期フラグ信号を遅延時間内に挿入し、受信系
B側で復調信号から同期フラグ信号を分離して、その終
了時点を検出するようにしているで、デジタル符号化信
号の同期確立を遅滞なく実現することができる。
Therefore, in the audio signal communication system having the above configuration, the output of the encoded audio signal is delayed on the transmitting system A side by the time required for establishing synchronization on the receiving system B side. It is possible to reproduce the audio signal without cutting off the beginning of the speech. At this time, the transmitting system A side inserts a synchronization flag signal within the delay time, the receiving system B side separates the synchronization flag signal from the demodulated signal, and detects the end point of the signal. Signal synchronization can be established without delay.

【0017】尚、符号化信号の遅延実現手段としては、
メモリバッファ回路5の代わりにレジスタを用い、遅延
時間設定回路6によって転送クロック入力開始を設定時
間Tdだけ遅らせるようにしてもよい。また、遅延時間
設定回路6はマイクロプロセッサによってソフト的に設
定し、機能的に等価なものとしてもよいことは勿論であ
る。
[0017] As means for realizing delay of the encoded signal,
A register may be used instead of the memory buffer circuit 5, and the delay time setting circuit 6 may delay the start of transfer clock input by a set time Td. Furthermore, it goes without saying that the delay time setting circuit 6 may be set by software using a microprocessor and may be functionally equivalent.

【0018】上記遅延時間Tdについては、一定の音声
フレーム時間単位(例えば20ms)以上の時間がとら
れるが、さらに音声信号を秘匿化するために100ms
程度の遅延を伴う同期が必要になることもある。このよ
うな場合にも、復調回路を含めて数100ms以下の遅
延時間であれば、実用上支障なく運用可能であり、極め
て効果的である。
[0018] Regarding the above-mentioned delay time Td, a certain audio frame time unit (for example, 20 ms) or more is required, but in order to further conceal the audio signal, 100 ms is required.
Synchronization with some degree of delay may be required. Even in such a case, if the delay time is several 100 ms or less including the demodulation circuit, it can be operated without any practical problems and is extremely effective.

【0019】[0019]

【発明の効果】以上のようにこの発明によれば、送信切
換の際に、受信側で話頭切断を生じることなく音声信号
を再生できる音声信号通信システムを提供することがで
きる。
As described above, according to the present invention, it is possible to provide an audio signal communication system in which an audio signal can be reproduced without cutting off the beginning of a speech on the receiving side during transmission switching.

【図面の簡単な説明】[Brief explanation of drawings]

【図1】この発明に係る音声信号通信システムの一実施
例を示すブロック図。
FIG. 1 is a block diagram showing an embodiment of an audio signal communication system according to the present invention.

【図2】同実施例の送信系の動作を説明するための波形
図。
FIG. 2 is a waveform diagram for explaining the operation of the transmission system of the same embodiment.

【符号の説明】[Explanation of symbols]

A…送信系、B…受信系、1…マイクロホン、2…符号
化回路、3…ボイスコントロールスイッチ、4…プレス
トークスイッチ、5…メモリバッファ回路、6…遅延時
間設定回路、7…変調器、8…出力増幅器、9…アンテ
ナ、10…アンテナ、11…低雑音増幅器、12…復調
器、13…分離回路、14…同期化回路、15…デコー
ダ、16…音声再生回路。
A... Transmission system, B... Receiving system, 1... Microphone, 2... Encoding circuit, 3... Voice control switch, 4... Press talk switch, 5... Memory buffer circuit, 6... Delay time setting circuit, 7... Modulator, 8... Output amplifier, 9... Antenna, 10... Antenna, 11... Low noise amplifier, 12... Demodulator, 13... Separation circuit, 14... Synchronization circuit, 15... Decoder, 16... Audio reproduction circuit.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】  デジタル符号化された音声信号を送受
信する音声信号通信システムにおいて、受信状態から送
信状態に切り替わる際に、送信側で同期確立に要する時
間相当の遅延を前記符号化音声信号に与えてから送信す
る送信遅延手段と、送信状態から受信状態に切り替わる
際に、前記遅延時間内に受信信号の同期を確立する同期
化手段とを具備する音声信号通信システム。
Claim 1: In an audio signal communication system that transmits and receives digitally encoded audio signals, when switching from a receiving state to a transmitting state, a delay equivalent to the time required to establish synchronization on the transmitting side is applied to the encoded audio signal. 1. An audio signal communication system comprising: a transmission delay means for transmitting a received signal after the signal is received; and a synchronization means for establishing synchronization of a received signal within the delay time when switching from a transmission state to a reception state.
【請求項2】  さらに、前記符号化音声信号の遅延期
間内に符号化信号の開始位置を示す同期フラグ信号を挿
入する同期フラグ信号挿入手段を備えることを特徴とす
る請求項1記載の音声信号通信システム。
2. The audio signal according to claim 1, further comprising synchronization flag signal insertion means for inserting a synchronization flag signal indicating a start position of the encoded signal within a delay period of the encoded audio signal. Communications system.
JP7785091A 1991-04-10 1991-04-10 Voice signal communication system Pending JPH04311117A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7785091A JPH04311117A (en) 1991-04-10 1991-04-10 Voice signal communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7785091A JPH04311117A (en) 1991-04-10 1991-04-10 Voice signal communication system

Publications (1)

Publication Number Publication Date
JPH04311117A true JPH04311117A (en) 1992-11-02

Family

ID=13645535

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7785091A Pending JPH04311117A (en) 1991-04-10 1991-04-10 Voice signal communication system

Country Status (1)

Country Link
JP (1) JPH04311117A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006203586A (en) * 2005-01-20 2006-08-03 Nec Corp Air radio system and press-to-talk control method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006203586A (en) * 2005-01-20 2006-08-03 Nec Corp Air radio system and press-to-talk control method
JP4569303B2 (en) * 2005-01-20 2010-10-27 日本電気株式会社 Anti-air radio system and its press-to-talk control method

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