JPH0621832A - Voice signal transmission circuit - Google Patents
Voice signal transmission circuitInfo
- Publication number
- JPH0621832A JPH0621832A JP17461992A JP17461992A JPH0621832A JP H0621832 A JPH0621832 A JP H0621832A JP 17461992 A JP17461992 A JP 17461992A JP 17461992 A JP17461992 A JP 17461992A JP H0621832 A JPH0621832 A JP H0621832A
- Authority
- JP
- Japan
- Prior art keywords
- output
- input
- microphone
- voice
- voice 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.)
- Withdrawn
Links
Landscapes
- Transmitters (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、携帯無線電話機等の音
声信号送信回路の改良に関する。携帯無線電話機は自動
車電話として使用する時は周囲雑音の多い道路で使用さ
れたり周囲雑音の少ない場所で使用されたりし、又通常
の携帯無線電話機として使用する場合も建築現場の如く
周囲雑音の多い所で使用されたり周囲雑音の少ない場所
で使用されたりする。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a voice signal transmitting circuit for a portable radio telephone or the like. When used as a car phone, the mobile wireless phone is used on a road with a lot of ambient noise or in a place with little ambient noise, and when used as a normal mobile wireless phone, it has a lot of ambient noise like a construction site. It is used in places or where there is little ambient noise.
【０００２】この場合携帯無線電話機の音声信号を送信
する音声信号送信回路としては、周囲雑音が多くとも周
囲雑音では起動せず、音声入力時は周囲雑音が多くとも
確実に起動するものであることが望まれている。In this case, the voice signal transmitting circuit for transmitting the voice signal of the portable radio telephone should not be activated by the ambient noise even if there is much ambient noise, and should be activated surely by the ambient noise at the time of voice input. Is desired.
【０００３】[0003]
【従来の技術】図３は従来例の音声信号送信回路のブロ
ック図である。図３において、マイクロホン１には音声
及び周囲雑音が入力し、出力は音声信号送信部４及び検
波器５’に入力する。2. Description of the Related Art FIG. 3 is a block diagram of a conventional audio signal transmitting circuit. In FIG. 3, voice and ambient noise are input to the microphone 1, and outputs are input to the voice signal transmitter 4 and the detector 5 ′.
【０００４】検波器５’ではマイクロホン１の出力を検
波し、閾値を有するレベル比較器６’に入力し、検波器
５’の出力レベルが閾値より大きいと音声信号送信部４
に起動信号を出力し、音声信号送信部４を起動し、携帯
無線電話機の場合は音声信号で変調された電波を出力す
るようにしている。The detector 5'detects the output of the microphone 1 and inputs it to the level comparator 6'having a threshold value. If the output level of the detector 5'is greater than the threshold value, the voice signal transmitting section 4 is detected.
The activation signal is output to activate the voice signal transmitting unit 4, and in the case of the mobile wireless telephone, the radio wave modulated by the voice signal is output.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、周囲雑
音が多くとも、周囲雑音による検波器５’の出力レベル
が閾値を越えないように閾値を高くすると、周囲雑音が
小さい所での音声（人間は周囲雑音が多い所では大きい
音声を出し、周囲雑音が小さい所ででは小さい音声を出
す）がマイクロホン１に入力しても、検波器５’の出力
レベルは閾値より小さいことがあり音声信号送信部４へ
の起動信号を出力せず音声信号を送信出来ないことがあ
る問題点がある。However, even if there is a lot of ambient noise, if the threshold value is set high so that the output level of the detector 5'due to ambient noise does not exceed the threshold value, the speech in a place where the ambient noise is small (human beings The output level of the detector 5 ′ may be smaller than the threshold even if the sound signal is input to the microphone 1). However, there is a problem that the voice signal cannot be transmitted without outputting the start signal to No. 4.
【０００６】又周囲雑音が小さい所での音声がマイクロ
ホン１に入力した時の検波器５’の出力レベルが閾値を
越えるように閾値を設定すると、周囲雑音が多い所では
周囲雑音による検波器５’の出力レベルが閾値を越えレ
ベル比較器４より音声信号送信部４への起動信号を出力
し、携帯無線電話機の場合は雑音により変調された電波
を出力することがある問題点がある。If a threshold value is set so that the output level of the detector 5'when a voice in a place with a small amount of ambient noise is input to the microphone 1, the detector 5 based on the ambient noise is used in a place with a large amount of ambient noise. There is a problem that the output level of 'exceeds the threshold and the level comparator 4 outputs the activation signal to the voice signal transmitting unit 4, and in the case of the portable radio telephone, the radio wave modulated by noise is output.
【０００７】本発明は、周囲雑音が多い所で使用しても
周囲雑音では起動せず、マイクロホンへの音声入力のみ
で確実に起動する音声信号送信回路の提供を目的として
いる。It is an object of the present invention to provide an audio signal transmitting circuit which is not activated by ambient noise even when used in a place where there is a lot of ambient noise, and which is activated reliably only by voice input to a microphone.
【０００８】[0008]
【課題を解決するための手段】図１は本発明の実施例の
音声信号送信回路のブロック図である。図１に示す如
く、音声及び周囲雑音が入力するようにした第１のマイ
クロホン１の出力の電気信号と、該第１のマイクロホン
１への入力と同じで大きさが略同じ周囲雑音が入力し音
声が殆ど入力しないようにした第２のマイクロホン２の
出力の電気信号とを差動増幅器３に入力し、該差動増幅
器３の出力を音声信号送信部４と出力信号を検波する検
波器５に入力し、該検波器５の出力を、使用範囲で周囲
雑音が最高の場所にて音声を入力しない場合の該差動増
幅器３の出力を該検波器５にて検波した値より僅か高い
レベルを閾値とするレベル比較器６に入力し、該閾値よ
り高い入力信号の時の該レベル比較器６の出力を該音声
信号送信部４の起動信号とするように構成する。FIG. 1 is a block diagram of an audio signal transmitting circuit according to an embodiment of the present invention. As shown in FIG. 1, the electrical signal of the output of the first microphone 1 to which voice and ambient noise are input, and the ambient noise that is the same as the input to the first microphone 1 and has substantially the same magnitude are input. An electric signal of the output of the second microphone 2 in which almost no sound is input is input to the differential amplifier 3, and the output of the differential amplifier 3 is detected by the audio signal transmitter 4 and the detector 5 for detecting the output signal. The output of the detector 5 to a level slightly higher than the value detected by the detector 5 for the output of the differential amplifier 3 when no sound is input at a place where ambient noise is highest in the use range. Is input to the level comparator 6 having a threshold value, and the output of the level comparator 6 when the input signal is higher than the threshold value is used as the activation signal of the audio signal transmitting unit 4.
【０００９】[0009]
【作用】本発明によれば、第１，第２のマイクロホン
１，２には略同じ大きさの同じ周囲雑音が入力するよう
になっているので、差動増幅器３の出力では雑音は打ち
消され非常に小さい値となる。According to the present invention, since the same ambient noise of approximately the same magnitude is input to the first and second microphones 1 and 2, the noise is canceled at the output of the differential amplifier 3. It is a very small value.
【００１０】即ち、使用する範囲で周囲雑音が最高の場
所での差動増幅器３の出力は、周囲雑音が小さな所での
音声が第１のマイクロホン１に入力した時の差動増幅器
３の出力よりも小さくなる。That is, the output of the differential amplifier 3 at the place where the ambient noise is the highest in the used range is the output of the differential amplifier 3 when the voice at the place where the ambient noise is small is input to the first microphone 1. Will be smaller than.
【００１１】そこで、レベル比較器６の閾値は、使用範
囲で周囲雑音が最高の場所にて音声を入力しない場合の
該差動増幅器３の出力を該検波器５にて検波した値より
僅か高いレベルとしてある。Therefore, the threshold value of the level comparator 6 is slightly higher than the value obtained by detecting the output of the differential amplifier 3 by the detector 5 when voice is not input at a place where ambient noise is highest in the use range. There is as a level.
【００１２】従って、音声を入力せずに、使用範囲で周
囲雑音の最高の所で使用しても、検波器５の出力は閾値
より小さく、レベル比較器６は起動信号を出力せず音声
信号送信部４は起動しない。Therefore, even if the voice signal is not input and it is used in the highest place of the ambient noise in the use range, the output of the detector 5 is smaller than the threshold value, and the level comparator 6 does not output the start signal and the voice signal. The transmitter 4 does not start.
【００１３】周囲雑音が小さい所での音声を第１のマイ
クロホン１に入力すると、検波器５の出力レベルは閾値
より高くレベル比較器６は起動信号を出力し音声信号送
信部４を起動し、携帯無線電話機の場合は音声信号で変
調された電波が出力される。When the voice in a place where the ambient noise is small is input to the first microphone 1, the output level of the detector 5 is higher than the threshold value and the level comparator 6 outputs a start signal to start the voice signal transmitter 4. In the case of a mobile radio telephone, a radio wave modulated with a voice signal is output.
【００１４】即ち、雑音のみでは音声信号送信部４は起
動せず、音声入力のみで音声信号送信部４は確実に起動
するようになる。That is, the voice signal transmitting unit 4 is not activated by only noise, and the voice signal transmitting unit 4 is activated by only voice input.
【００１５】[0015]
【実施例】図１は本発明の実施例の音声信号送信回路の
ブロック図、図２は本発明の実施例のマイクロホン支持
部を示す図である。1 is a block diagram of an audio signal transmitting circuit according to an embodiment of the present invention, and FIG. 2 is a diagram showing a microphone supporting portion according to an embodiment of the present invention.
【００１６】マイクロホン１，２は図２に示す如く、マ
イクロホン１は人間の口の方向で、マイクロホン２はマ
イクロホン１の近くで人間の口でない方向にマイクロホ
ン支持部１０にて支持するようにすると、マイクロホン
１には音声及び周囲雑音が入力し、マイクロホン２には
マイクロホン１への入力と同じで大きさが略同じ周囲雑
音が入力し音声は殆ど入力しなくなる。As shown in FIG. 2, the microphones 1 and 2 support the microphone 1 in the direction of the human mouth and the microphone 2 in the direction near the microphone 1 and not in the human mouth by the microphone supporting portion 10. Voice and ambient noise are input to the microphone 1, and ambient noise that is the same as the input to the microphone 1 and has substantially the same magnitude is input to the microphone 2, and almost no voice is input.
【００１７】音声を入力せず、このマイクロホン１，２
の出力を図１の差動増幅器３に入力するようにすると、
前記説明の如く、雑音は殆ど打ち消され非常に少ない値
となり、使用する範囲で周囲雑音が最高の場所での差動
増幅器３の出力は、周囲雑音が小さな所での音声がマイ
クロホン１に入力した時の差動増幅器３の出力よりも小
さくなる。Without inputting voice, the microphones 1, 2
When the output of is input to the differential amplifier 3 of FIG. 1,
As described above, the noise is almost canceled and becomes a very small value, and the output of the differential amplifier 3 at the place where the ambient noise is the highest in the range of use is the voice input to the microphone 1 at the place where the ambient noise is small. It becomes smaller than the output of the differential amplifier 3 at that time.
【００１８】そこで、レベル比較器６の閾値は、使用範
囲で周囲雑音が最高の場所にて音声を入力しない場合の
差動増幅器３の出力を検波器５にて検波した値より僅か
高いレベルとしてある。Therefore, the threshold of the level comparator 6 is set to a level slightly higher than the value detected by the detector 5 for the output of the differential amplifier 3 when voice is not input at a place where ambient noise is highest in the use range. is there.
【００１９】従って、音声を入力せずに、使用範囲で周
囲雑音の最高の所で使用しても、検波器５の出力は閾値
より小さくレベル比較器６は起動信号を出力せず音声信
号送信部４は起動しない。Therefore, even if the voice is not input and used in a place where the ambient noise is the highest in the usage range, the output of the detector 5 is smaller than the threshold value and the level comparator 6 does not output the start signal and transmits the voice signal. Part 4 does not start.
【００２０】周囲雑音が小さい所での音声をマイクロホ
ン１に入力すると、検波器５の出力レベルは閾値より高
くレベル比較器６は起動信号を出力し音声信号送信部４
を起動し、携帯無線電話機の場合は音声信号で変調され
た電波が出力される。When the voice in a place where the ambient noise is small is input to the microphone 1, the output level of the detector 5 is higher than the threshold value, the level comparator 6 outputs a start signal, and the voice signal transmitting unit 4
Is activated, and in the case of a mobile wireless telephone, a radio wave modulated with a voice signal is output.
【００２１】即ち、雑音のみでは音声信号送信部４は起
動せず、音声入力のみで音声信号送信部４は確実に起動
するようになる。That is, the voice signal transmitting section 4 is not activated by only noise, and the voice signal transmitting section 4 is activated by only voice input.
【００２２】[0022]
【発明の効果】以上詳細に説明せる如く本発明によれ
ば、周囲雑音が多い所で使用しても周囲雑音では起動せ
ず、マイクロホンへの音声入力のみで確実に起動する音
声信号送信回路が得られる効果がある。As described in detail above, according to the present invention, there is provided a voice signal transmitting circuit which is not activated by ambient noise even when used in a place where there is a lot of ambient noise, and is activated only by voice input to a microphone. There is an effect to be obtained.
【図１】は本発明の実施例の音声信号送信回路のブロッ
ク図、FIG. 1 is a block diagram of an audio signal transmitting circuit according to an embodiment of the present invention,
【図２】は本発明の実施例のマイクロホン支持部を示す
図、FIG. 2 is a diagram showing a microphone supporting portion of an embodiment of the present invention,
【図３】は従来例の音声信号送信回路のブロック図であ
る。FIG. 3 is a block diagram of a conventional audio signal transmitting circuit.
１，２はマイクロホン、３は差動増幅器、４は音声信号
送信部、５，５’は検波器、６，６’はレベル比較器、
１０はマイクロホン支持部を示す。1, 2 are microphones, 3 are differential amplifiers, 4 are audio signal transmitters, 5 and 5'are detectors, 6 and 6'are level comparators,
Reference numeral 10 denotes a microphone supporting portion.
Claims (1)
第１のマイクロホン（１）の出力の電気信号と、該第１
のマイクロホン（１）への入力と同じで大きさが略同じ
周囲雑音が入力し音声が殆ど入力しないようにした第２
のマイクロホン（２）の出力の電気信号とを差動増幅器
（３）に入力し、該差動増幅器（３）の出力を音声信号
送信部（４）と出力信号を検波する検波器（５）に入力
し、該検波器（５）の出力を、 使用範囲で周囲雑音が最高の場所にて音声を入力しない
場合の該差動増幅器（３）の出力を該検波器（５）にて
検波した値より僅か高いレベルを閾値とするレベル比較
器（６）に入力し、該閾値より高い入力信号の時の該レ
ベル比較器（６）の出力を該音声信号送信部（４）の起
動信号とするようにしたことを特徴とする音声信号送信
回路。1. An electric signal output from a first microphone (1) adapted to receive voice and ambient noise, and the first electric signal.
The same as the input to the microphone (1) of the same size, but with substantially the same magnitude as the ambient noise is input and almost no voice is input.
The electric signal of the output of the microphone (2) is input to the differential amplifier (3), and the output of the differential amplifier (3) is detected by the audio signal transmitting unit (4) and the output signal (5). The output of the detector (5), and the output of the differential amplifier (3) when the voice is not input at a place where the ambient noise is the highest in the usage range. Is input to a level comparator (6) having a threshold value slightly higher than the threshold value, and the output of the level comparator (6) when the input signal is higher than the threshold value is a start signal of the audio signal transmitting unit (4). An audio signal transmitting circuit characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17461992A JPH0621832A (en) | 1992-07-02 | 1992-07-02 | Voice signal transmission circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17461992A JPH0621832A (en) | 1992-07-02 | 1992-07-02 | Voice signal transmission circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0621832A true JPH0621832A (en) | 1994-01-28 |
Family
ID=15981760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17461992A Withdrawn JPH0621832A (en) | 1992-07-02 | 1992-07-02 | Voice signal transmission circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0621832A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112888962A (en) * | 2018-08-01 | 2021-06-01 | 德克萨斯仪器股份有限公司 | Sound sensing with time-varying threshold |
-
1992
- 1992-07-02 JP JP17461992A patent/JPH0621832A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112888962A (en) * | 2018-08-01 | 2021-06-01 | 德克萨斯仪器股份有限公司 | Sound sensing with time-varying threshold |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19991005 |