JPH02209034A - Voice privacy telephone set - Google Patents
Voice privacy telephone setInfo
- Publication number
- JPH02209034A JPH02209034A JP3085189A JP3085189A JPH02209034A JP H02209034 A JPH02209034 A JP H02209034A JP 3085189 A JP3085189 A JP 3085189A JP 3085189 A JP3085189 A JP 3085189A JP H02209034 A JPH02209034 A JP H02209034A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- transmission
- circuit
- voice
- transmission noise
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 68
- 230000005236 sound signal Effects 0.000 claims description 12
- 238000001228 spectrum Methods 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 abstract description 13
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、秘密通信の音声秘話装置に利用する。[Detailed description of the invention] [Industrial application field] INDUSTRIAL APPLICATION This invention is utilized for the audio|voice secret device for secret communication.
特に、送信側において送信音声信号の広い周波数帯域内
でパワースペクトルがほぼ平坦となる雑音信号に送信音
声信号を重畳させた秘話信号を送出し、受信側において
、受信された秘話信号から音声信号を抽出するように構
成し、送受信間での同期信号や制御信号の授受を必要と
せず、傍受された信号では音声の抑揚を認識できない音
声秘話装置に関するものである。In particular, the transmitting side transmits a confidential signal in which the transmitted audio signal is superimposed on a noise signal whose power spectrum is almost flat within a wide frequency band of the transmitted audio signal, and the receiving side converts the audio signal from the received confidential signal. This invention relates to a voice secret speech device that is configured to perform extraction, does not require exchange of synchronization signals or control signals between transmitters and receivers, and is unable to recognize voice intonation from intercepted signals.
本発明は音声秘話装置において、
送信雑音発生回路の出力送信雑音信号に基づいてエコー
キャンセラでハイブリッド回路を経て廻り込んだ自装置
の秘話信号から送信雑音信号を除去することにより、
二線式伝送路にも秘話用雑音を加えることができるよう
にしたものである。The present invention provides a voice communication device that uses an echo canceller to remove the transmission noise signal from the device's own communication signal that has passed through the hybrid circuit based on the output transmission noise signal of the transmission noise generation circuit, thereby reducing the transmission noise signal from the two-wire transmission line. It is also possible to add secret noise to the text.
従来、音声秘話装置は、送信側に、送信音声信号の広い
周波数帯域内でパワースペクトルがほぼ平坦で、かつ、
周期的に同一波形の雑音信号を発生させる送信雑音発生
回路と、送信雑音発生回路の送信雑音信号と送信音声信
号とを加算する加算回路とを有し、加算された信号を秘
話信号として伝送路に送出する。また、受信側に、送信
側の送信雑音発生回路と同一機能をもつ基準雑音発生回
路と、基準雑音信号を参照して秘話信号から送信音声信
号を抽出するエコーキャンセラとを有しているものであ
った。ここで、伝送路としては送受信がそれぞれ独立し
た四線式伝送路を使用していた。Conventionally, voice privacy devices have a transmitting side that has a power spectrum that is approximately flat within a wide frequency band of a transmitted voice signal, and
It has a transmission noise generation circuit that periodically generates a noise signal with the same waveform, and an addition circuit that adds the transmission noise signal of the transmission noise generation circuit and the transmission audio signal, and uses the added signal as a secret signal to transmit the transmission line. Send to. The receiving side also includes a reference noise generating circuit that has the same function as the transmitting noise generating circuit on the transmitting side, and an echo canceller that extracts the transmitted voice signal from the secret signal by referring to the reference noise signal. there were. Here, a four-wire transmission line with independent transmission and reception was used as the transmission line.
しかし、このような従来の音声秘話装置では、この装置
をハイブリッド回路を経て送受信が同一の伝送路の二線
式伝送路にて伝送する場合に使用するときには、送信側
の秘話信号がハイブリッド回路を経て同じ装置の受信側
に戻ってきた秘話信号から雑音を除去することができな
いために、二線式伝送路を使用できない欠点があった。However, with such a conventional voice confidential communication device, when this device is used for transmission via a hybrid circuit over a two-wire transmission line in which transmission and reception are the same transmission path, the confidential communication signal on the transmitting side passes through the hybrid circuit. Since it is not possible to remove noise from the confidential signal that is later returned to the receiving side of the same device, it has the disadvantage that a two-wire transmission line cannot be used.
本発明は上記の欠点を解決するもので、二線式伝送路に
も秘話用雑音を加えることができる音声秘話装置を提供
することを目的とする。SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned drawbacks, and aims to provide a voice privacy device that can add privacy noise to a two-wire transmission path.
本発明は、入力する送信音声信号の広い周波数帯域内で
パワースペクトルがほぼ平坦で周期的に同一波形の送信
雑音信号を発生する送信雑音発生回路と、この送信雑音
発生回路の出力信号と上記送信音声信号とを加算して秘
話信号を生成する加算回路と、この秘話信号を伝送路を
介して相手装置に送出するハイブリッド回路とを備えた
音声秘話装置において、上記送信雑音発生回路の出力信
号に基づいて上記ハイブリッド回路を経て廻り込む上記
加算回路の出力信号から上記送信雑音発生回路の出力信
号を除去するエコーキャンセラを備えたことを特徴とす
る。The present invention provides a transmission noise generation circuit that periodically generates a transmission noise signal with a substantially flat power spectrum and the same waveform within a wide frequency band of an input transmission audio signal, an output signal of this transmission noise generation circuit, and the transmission In a voice confidential communication device that includes an adding circuit that generates a confidential signal by adding audio signals and a hybrid circuit that sends this confidential signal to the other party's device via a transmission path, the output signal of the transmission noise generation circuit is The present invention is characterized in that it includes an echo canceller that removes the output signal of the transmission noise generation circuit from the output signal of the addition circuit that passes through the hybrid circuit.
エコーキャンセラで送信雑音発生回路の出力信号に基づ
いてハイブリッド回路を経て廻り込んだ自装置の加算回
路の出力信号から送信雑音発生回路の出力信号を除去す
る。この動作により２線式伝送路にも秘話用雑音を加え
ることができる。Based on the output signal of the transmission noise generation circuit, the echo canceller removes the output signal of the transmission noise generation circuit from the output signal of the adder circuit of the own device that has passed through the hybrid circuit. By this operation, confidential noise can be added to the two-wire transmission line as well.
本発明の実施例について図面を参照して説明する。図は
本発明一実施例音声秘話装置のブロック構成図、である
。図において、音声秘話装置１．２は、送信音声信号を
入力する入力端子１１．２１と、この入力する送信音声
信号の広い周波数帯域内でパワースペクトルがほぼ平坦
で周期的に同一波形の送信雑音信号を発生する送信雑音
発生回路１２．２２と、送信雑音発生回路１２．２２の
出力信号と上記送信音声信号とを加算して秘話信号を生
成する加算回路１３．２３と、入出力端子１５．２５と
、上記秘話信号を入出力端子１５．２５および伝送路３
０を介して相手装置に送出するハイブリッド回路１４．
２４と、相手装置の送信雑音発生回路２２．１２と同一
の機能をもつ基準雑音発生回路１６．２６と、基準雑音
発生回路１６．２６の出力信号に基づいてハイブリッド
回路１４．２４から入力した相手装置の秘話信号から送
信雑音信号を除去する適応形エコーキャンセラ１７．２
７と、出力端子１９．２９とを備える。Embodiments of the present invention will be described with reference to the drawings. The figure is a block diagram of a voice secret communication device according to an embodiment of the present invention. In the figure, the voice privacy device 1.2 has an input terminal 11.21 for inputting a transmitted voice signal, and a transmission noise whose power spectrum is approximately flat and periodically has the same waveform within a wide frequency band of the inputted transmitted voice signal. A transmission noise generation circuit 12.22 that generates a signal, an addition circuit 13.23 that adds the output signal of the transmission noise generation circuit 12.22 and the transmission audio signal to generate a confidential signal, and an input/output terminal 15.22. 25, and the above confidential signal is input/output terminal 15.25 and transmission line 3.
Hybrid circuit 14 that sends data to the other device via 0.
24, a reference noise generation circuit 16.26 which has the same function as the transmission noise generation circuit 22.12 of the other party, and a reference noise generation circuit 16.26 which is input from the hybrid circuit 14.24 based on the output signal of the reference noise generation circuit 16.26. Adaptive echo canceller 17.2 that removes transmitted noise signals from confidential signals of devices
7 and an output terminal 19.29.
ここで本発明の特徴とするところは、送信雑音発生回路
１２．２２の出力信号に基づいて適応形エコーキャンセ
ラ１７．２７の出力信号中のハイブリッド回路１４．２
４を経て廻り込む自装置の加算回路１３．２３の出力信
号から送信雑音発生回路１２．２２の出力信号を除去し
て出力端子１９．２９に与えるエコーキャンセラとして
適応形エコーキャンセラ１８．２８を備えたことにある
。Here, the feature of the present invention is that the hybrid circuit 14.2 generates an output signal of the adaptive echo canceller 17.27 based on the output signal of the transmission noise generation circuit 12.22.
An adaptive echo canceller 18.28 is provided as an echo canceller that removes the output signal of the transmission noise generation circuit 12.22 from the output signal of the adder circuit 13.23 of the own device that goes around through 4 and supplies it to the output terminal 19.29. That's true.
このような構成の音声秘話装置の動作について説明する
。The operation of the voice secret communication device having such a configuration will be explained.
まず、音声秘話装置１から音声秘話装置２への動作につ
いて説明する。First, the operation from the voice confidential communication device 1 to the voice confidential communication device 2 will be explained.
入力端子１１に入力した音声信号に送信雑音発生回路１
２からの送信雑音信号を加算回路１３にて加算する。こ
のときに、送信雑音信号が音声信号に対して十分大きけ
れば、その加算回路１３の出力信号は秘話信号となる。A transmission noise generation circuit 1 is applied to the audio signal input to the input terminal 11.
The transmission noise signals from 2 are added in an adding circuit 13. At this time, if the transmission noise signal is sufficiently larger than the voice signal, the output signal of the adder circuit 13 becomes a confidential signal.
その秘話信号はハイブリッド回路１４を経由して入出力
端子１５および適応形エコーキャンセラ１７に出力され
る。入出力端子１５に出力された秘話信号は伝送路３０
を経て音声秘話装置２に出力される。The secret signal is outputted to the input/output terminal 15 and the adaptive echo canceller 17 via the hybrid circuit 14. The secret signal output to the input/output terminal 15 is transmitted through the transmission line 30.
The signal is output to the voice confidential communication device 2 via the .
音声秘話装置２では、音声秘話装置１の秘話信号は入出
力端子２５に入力しハイブリッド回路２４にて適応形エ
コーキャンセラ２７に出力される。ところがハイブリッ
ド回路２４には、音声秘話装置２の入力端子２１に入力
した音声信号に送信雑音発生回路２２からの送信雑音信
号を加算した秘話信号も入力しているために、適応形エ
コーキャンセラ２７には音声秘話装置１の秘話信号と音
声秘話装置２の秘話信号が入力している。そこで、まず
適応形エコーキャンセラ２７にて、音声秘話装置ｌの送
信雑音発生回路１２と同一の機能をもつ基準雑音発生回
路２６からの基準雑音信号を参照して、音声秘話装置ｌ
からの送信雑音信号を除去する。次に、適応形エコーキ
ャンセラ２８にて、音声秘話装置２の送信雑音発生回路
２２からの送信雑音信号を参照して、音声秘話装置２か
らの送信雑音信号を除去する。In the audio confidential communication device 2, the confidential communication signal of the audio confidential communication device 1 is inputted to the input/output terminal 25, and is outputted to the adaptive echo canceller 27 through the hybrid circuit 24. However, since the hybrid circuit 24 also receives a confidential signal obtained by adding the transmission noise signal from the transmission noise generation circuit 22 to the audio signal input to the input terminal 21 of the audio confidential communication device 2, the adaptive echo canceller 27 The confidential signal of the audio confidential device 1 and the confidential signal of the audio confidential device 2 are input. Therefore, first, the adaptive echo canceller 27 refers to the reference noise signal from the reference noise generation circuit 26, which has the same function as the transmission noise generation circuit 12 of the voice secret communication device l, and
Remove the transmitted noise signal from. Next, the adaptive echo canceller 28 refers to the transmission noise signal from the transmission noise generation circuit 22 of the voice privacy device 2 and removes the transmission noise signal from the voice privacy device 2 .
そして、これらの適応形エコーキャンセラ２７．２Ｂに
より、音声秘話装置１および２からの音声信号が再生さ
れ、音声秘話装置２の出力端子２９より出力される。These adaptive echo cancellers 27.2B reproduce the audio signals from the audio privacy devices 1 and 2, and output them from the output terminal 29 of the audio privacy device 2.
音声秘話装置２から音声秘話装置１への動作もまったく
同じである。The operation from the voice secret device 2 to the voice secret device 1 is exactly the same.
以上説明したように、本発明は、二線式の伝送路にも秘
話用雑音を加えることができる優れた効果がある。As explained above, the present invention has the excellent effect of adding secret noise to a two-wire transmission path.
図は本発明一実施例音声秘話装置のブロック構成図。
１．２・・・音声秘話装置、１１．２１・・・入力端子
、１２．２２・・・送信雑音発生回路、１３．２３・・
・加算回路、１４．２４・・・ハイブリッド回路、１５
．２５・・・入出力端子、１６．２６・・・基準雑音発
生回路、１７．１８．２７．２８・・・適応形エコーキ
ャンセラ、１９．２９・・・出力端子、３０・・・伝送
路。The figure is a block diagram of a voice secret communication device according to an embodiment of the present invention. 1.2...Voice secret communication device, 11.21...Input terminal, 12.22...Transmission noise generation circuit, 13.23...
・Addition circuit, 14.24...Hybrid circuit, 15
．． 25... Input/output terminal, 16.26... Reference noise generation circuit, 17.18.27.28... Adaptive echo canceller, 19.29... Output terminal, 30... Transmission line.
Claims (1)
スペクトルがほぼ平坦で周期的に同一波形の送信雑音信
号を発生する送信雑音発生回路と、この送信雑音発生回
路の出力信号と上記送信音声信号とを加算して秘話信号
を生成する加算回路と、この秘話信号を伝送路を介して
相手装置に送出するハイブリッド回路とを備えた 音声秘話装置において、 上記送信雑音発生回路の出力信号に基づいて上記ハイブ
リッド回路を経て廻り込む上記加算回路の出力信号から
上記送信雑音発生回路の出力信号を除去するエコーキャ
ンセラを備えた ことを特徴とする音声秘話装置。[Claims] 1. A transmission noise generation circuit that periodically generates a transmission noise signal with a substantially flat power spectrum and the same waveform within a wide frequency band of an input transmission audio signal, and an output of this transmission noise generation circuit. In a voice confidential communication device comprising an addition circuit that adds a signal and the transmitted audio signal to generate a confidential signal, and a hybrid circuit that sends this confidential signal to a partner device via a transmission path, the transmission noise generation circuit 1. A voice secret communication device comprising an echo canceller that removes the output signal of the transmission noise generation circuit from the output signal of the adder circuit that passes through the hybrid circuit based on the output signal of the adder circuit.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3085189A JPH02209034A (en) | 1989-02-08 | 1989-02-08 | Voice privacy telephone set |
| CA000603874A CA1331644C (en) | 1988-06-25 | 1989-06-23 | Scrambled communication system using adaptive transversal filters for descrambling received signals |
| US07/371,209 US5008937A (en) | 1988-06-25 | 1989-06-26 | Scrambled-communication system using adaptive transversal filters for descrambling received signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3085189A JPH02209034A (en) | 1989-02-08 | 1989-02-08 | Voice privacy telephone set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02209034A true JPH02209034A (en) | 1990-08-20 |
Family
ID=12315213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3085189A Pending JPH02209034A (en) | 1988-06-25 | 1989-02-08 | Voice privacy telephone set |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02209034A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013090334A (en) * | 2011-10-19 | 2013-05-13 | General Electric Co <Ge> | Wired communications systems with improved capacity and security |
-
1989
- 1989-02-08 JP JP3085189A patent/JPH02209034A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013090334A (en) * | 2011-10-19 | 2013-05-13 | General Electric Co <Ge> | Wired communications systems with improved capacity and security |
| GB2502844A (en) * | 2011-10-19 | 2013-12-11 | Gen Electric | Division-free duplexing in a cable communication network |
| US8787571B2 (en) | 2011-10-19 | 2014-07-22 | General Electric Company | Wired communications systems with improved capacity and security |
| GB2502844B (en) * | 2011-10-19 | 2014-08-06 | Gen Electric | Wired communications systems with improved capacity and security |
| US10666623B2 (en) | 2011-10-19 | 2020-05-26 | General Electric Company | Wired communications systems with improved capacity and security |
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