JPH0326704Y2 - - Google Patents
Info
- Publication number
- JPH0326704Y2 JPH0326704Y2 JP1982170225U JP17022582U JPH0326704Y2 JP H0326704 Y2 JPH0326704 Y2 JP H0326704Y2 JP 1982170225 U JP1982170225 U JP 1982170225U JP 17022582 U JP17022582 U JP 17022582U JP H0326704 Y2 JPH0326704 Y2 JP H0326704Y2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- microphone
- circuit
- vox
- output
- 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.)
- Expired
Links
- 230000007257 malfunction Effects 0.000 claims description 5
- 230000002238 attenuated effect Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 15
- 230000005236 sound signal Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Transceivers (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案はマイクロホンとスピーカが極度に接
近した構造の送受信機において、VOX使用時の
誤動作を防止する回路に関する。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a circuit that prevents malfunctions when VOX is used in a transmitter/receiver having a structure in which a microphone and a speaker are extremely close to each other.
FM送受信機においてVOXとはVoice
Operationのことであつて、受信状態でマイクロ
ホンに向つて送話すると、回路は自動的に送信に
切換わるが、受信音がででいるときは先方が話し
中であつて、当方から送信しても無駄であるし、
送信中は先方の話が聞けなくて、通信が中断する
ことになる。このマイクロホン入力による受信か
ら送信への自動切換えは、マイクロホンとスピー
カとの音響的結合はない程良いが、数10cm以上の
間隔があれば通常の使用には全く問題がないもの
である。
What is VOX in FM transceivers?Voice
This refers to operation, and if you send a message into the microphone while receiving, the circuit will automatically switch to transmitting, but if the receiving sound is output, it means that the other party is busy and you are not transmitting. is also a waste,
During transmission, you will not be able to hear what the other party is saying, and the communication will be interrupted. This automatic switching from reception to transmission by microphone input is better if there is no acoustic coupling between the microphone and speaker, but there is no problem in normal use as long as there is a distance of several tens of centimeters or more.
ところが、最近は携帯形送受信機や、本体より
分離した操作箱にマイクロホンとスピーカを収容
する構造が多くなり、このようにマイクロホンと
スピーカが密結合の状態では、マイクロホンには
スピーカからの廻り込みによるVOX動作に異常
をきたすことが多くなつている。そこでスピーカ
をヘツドホンまたはマイクロホンから離れた位置
に設けた外部スピーカに代えるか、手動式にかえ
る必要があつた。 However, recently, there are many portable transceivers and structures where the microphone and speaker are housed in an operation box separate from the main body, and when the microphone and speaker are tightly coupled like this, the microphone is exposed to interference from the speaker. Abnormalities in VOX operation are becoming more common. Therefore, it was necessary to replace the speaker with an external speaker located far from the headphone or microphone, or to change it to a manual speaker.
本考案は受信音が出ているときは、マイクロホ
ンに送話しても送信に切換わることがなく、受信
音がなくて、マイクロホンに送話したときのみ送
信状態となる回路の提供を目的とする。
The purpose of the present invention is to provide a circuit that does not switch to transmitting even if a person sends a message to a microphone when receiving sound is produced, and only enters the transmitting state when there is no receiving sound and a person sends a message to the microphone. .
スケルチ制御信号によつてマイク信号を減衰す
る制御回路をマイクアンプ回路に配設したマイク
アンプ減衰手段と、前記マイクアンプ回路の出力
と受信側音声出力信号とを比較してマイクアンプ
出力が大きいと送信側に切換わるVOX信号を出
力する比較検出手段とを備えた構成のVOX誤動
作防止回路である。
A microphone amplifier attenuation means is provided with a control circuit for attenuating a microphone signal by a squelch control signal in a microphone amplifier circuit, and when the output of the microphone amplifier circuit and the receiving side audio output signal are compared, the microphone amplifier output is larger. This is a VOX malfunction prevention circuit configured to include a comparison detection means for outputting a VOX signal to be switched to the transmitting side.
第１図は本考案の一実施例を示すブロツク図で
あり、第１図により説明する。図中１は受信回路
の中間周波増幅器IF、２は検波器Det、３はスケ
ルチゲートSqG、４は低周波増幅器AF、５はス
ピーカSpである。ますスケルチ動作は検波器Det
２の出力からスケルチ検出器SqD６で検出して、
スケルチ制御信号をスケルチゲートSqG３に加え
て、受信信号の無い時はスケルチゲートを閉じて
無用の雑音を出さないようにしている。
FIG. 1 is a block diagram showing an embodiment of the present invention, which will be explained with reference to FIG. In the figure, 1 is an intermediate frequency amplifier IF of the receiving circuit, 2 is a detector Det, 3 is a squelch gate SqG, 4 is a low frequency amplifier AF, and 5 is a speaker Sp. The squelch operation is caused by the detector Det.
Detected from the output of 2 by squelch detector SqD6,
A squelch control signal is added to squelch gate SqG3, and when there is no received signal, the squelch gate is closed to prevent unnecessary noise from being generated.
送信側はマイクロホンＭ７の出力をマイクアン
プ回路８を通して変調器Mod９に加える。VOX
操作の場合はVOX制御部１０にも加えている。
このVOX制御部１０には受信信号の低周波増幅
器AF４の出力も加えられている。受信出力優先
で送受信動作を決定する送受切換信号を出力す
る。通常VOX制御部１０は入力されたマイク信
号と受信音声信号を比較して信号の強弱や有無の
データから必要な送受信切換信号を出力するもの
であるから、スピーカSp５とマイクロホンＭ７
が別個のケースに装着されている場合は多少の音
響結合があつても動作上の支障は無いものである
が、スピーカSp５とマイクロホンＭ７を１個の
小形のケース内に近接して装着した場合には、極
めて強度な音響結合が生じてしまう。そのため、
スケルチ信号でスケルチゲートSqG３が閉じた状
態では異常はないが受信状態でスケルチゲート
SqG３が開いている場合には、スピーカSp５か
らマイクロホンＭ７に音声信号が廻り込みマイク
アンプ回路８で増幅されて大きな信号がVOX制
御部に供給される。そのため受信音声信号に対す
るマイクアンプ信号のレベルが大きくなり過ぎ
て、送受信切換信号の比較判定が困難となつて送
受信切換信号の出力が不安定になる恐れがある。 On the transmitting side, the output of microphone M7 is applied to modulator Mod9 through microphone amplifier circuit 8. VOX
For operation, it is also added to the VOX control unit 10.
The output of the low frequency amplifier AF4 for the received signal is also added to this VOX control section 10. Outputs a transmission/reception switching signal that determines transmission/reception operations with priority given to reception output. Normally, the VOX control unit 10 compares the input microphone signal and the received audio signal and outputs the necessary transmission/reception switching signal based on the signal strength and presence/absence data.
If they are installed in separate cases, there will be no operational problem even if there is some acoustic coupling, but if the speaker Sp5 and microphone M7 are installed close together in one small case. This results in extremely strong acoustic coupling. Therefore,
There is no abnormality when the squelch gate SqG3 is closed due to the squelch signal, but when the squelch gate is in the reception state
When SqG3 is open, an audio signal goes around from speaker Sp5 to microphone M7, is amplified by microphone amplifier circuit 8, and a large signal is supplied to the VOX control section. Therefore, the level of the microphone amplifier signal with respect to the received audio signal becomes too high, making it difficult to compare and determine the transmission/reception switching signal, and the output of the transmission/reception switching signal may become unstable.
これを防止するためにスケルチ制御信号をマイ
クアンプ回路８のマイク信号減衰回路に加えて、
受信回路のスケルチゲートSqG３が開いた受信音
出力時にはマイク信号を減衰させるよう構成して
いる。その制御レベルはスケルチゲートが誤動作
をしない程度にマイクアンプ信号を減衰すればよ
いが究極的にはマイクアンプ信号が０レベルにな
つてもよい。第２図はマイクアンプ回路８のマイ
クアンプ信号の減衰回路を示す。マイクアンプ回
路Ａのゲイン制御回路を示す。マイクアンプ回路
Ａのゲイン制御回路Ａを加えた回路である。ま
た、第３図はトランジスタＱのベースＢにスケル
チ制御信号を加え、コレクタ・エミツタ（Ｃ−
Ｅ）間の内部抵抗と回路抵抗Ｒとの比によつてゲ
インを低下させる他の実施例である。以上の構成
によつて受信信号からの廻り込みがあつても受信
側は保持されるが他方においては送信時は送信側
へ確実に切換えければならない。 To prevent this, a squelch control signal is added to the microphone signal attenuation circuit of the microphone amplifier circuit 8.
The configuration is such that the microphone signal is attenuated when the squelch gate SqG3 of the receiving circuit is open and the received sound is output. The control level may be such that the microphone amplifier signal is attenuated to such an extent that the squelch gate does not malfunction, but ultimately the microphone amplifier signal may be at 0 level. FIG. 2 shows an attenuation circuit for the microphone amplifier signal of the microphone amplifier circuit 8. As shown in FIG. A gain control circuit of microphone amplifier circuit A is shown. This is a circuit in which a gain control circuit A of a microphone amplifier circuit A is added. Also, in Figure 3, a squelch control signal is applied to the base B of the transistor Q, and the collector-emitter (C-
This is another embodiment in which the gain is lowered by the ratio of the internal resistance between E) and the circuit resistance R. With the above configuration, even if there is a loop from the received signal, the receiving side is maintained, but on the other hand, when transmitting, it is necessary to reliably switch to the transmitting side.
もち論完全なスケルチ制御状態で受信信号音が
出力されない場は問題ないが実際には混信やフエ
ーデイング等色々なフアクタによる影響も考慮し
ておく必要がある。そのためにはスケルチ制御が
オンオフに変化する受信レベル領域でも送信中は
完全にその影響を受けず確実に送信側に切換えら
れるよう構成する。そのためにVOX制御部１０
では受信の音声レベルと送信時のマイク信号レベ
ルを比較して大きい方に切換わるよう構成されて
いる。送信を一定時間保持するためには、ことば
の息継等で音声入力が途切れた場合でも送信側を
保持させておく必要がある。そこでマイク入力の
音声信号は整流されて一定の時定数を持つた信号
レベルにしてVOX制御部１０に供給する。 In theory, there is no problem if the received signal sound is not output under a complete squelch control state, but in reality, it is necessary to consider the effects of various factors such as interference and fading. To this end, the configuration is such that even in a reception level range where squelch control changes on and off, it is completely unaffected during transmission and can be reliably switched to the transmission side. For this purpose, the VOX control unit 10
The system is configured to compare the reception audio level and the transmission microphone signal level and switch to the higher one. In order to maintain transmission for a certain period of time, it is necessary to maintain the transmission side even when voice input is interrupted due to pauses in speech, etc. Therefore, the audio signal input from the microphone is rectified and made into a signal level having a constant time constant and is supplied to the VOX control section 10.
従つて受信時はマイク側への音声信号の廻り込
みによる弊害を完全に遮断し、送信時は受信の必
要な時間は受信側に切換らないようVOX制御部
１０で制御する。 Therefore, during reception, the adverse effects caused by the audio signal going around to the microphone side are completely blocked, and during transmission, the VOX control section 10 controls so as not to switch to the reception side during the necessary time for reception.
本考案では無線通信機のVOX制御信号による
送信と受信との切換えを確実にするため、受信回
路に通常備えているスケルチ回路のスケルチ信号
を用いて、受信時は確実に受信側を保持するよう
にマイクアンプ回路の出力を低減させる手段と、
受信側に設定する為のVOX制御部へ供給するマ
イクアンプ出力レベルは、スケルチが不安定にな
る混信またはフエデイングによる受信レベルの変
動および音声の息継などにも影響されない制御レ
ベルを出力して確実に送信側を保持できるよう構
成してあるので送信時受信時ともにVOX制御の
誤動作を防げる効果がある。
In this invention, in order to ensure switching between transmission and reception using the VOX control signal of the wireless communication device, the squelch signal of the squelch circuit normally provided in the receiving circuit is used to ensure that the receiving side is held securely during reception. means for reducing the output of the microphone amplifier circuit;
The microphone amplifier output level supplied to the VOX control unit for setting on the receiving side is ensured by outputting a control level that is not affected by fluctuations in reception level due to interference or fading that makes squelch unstable, and voice breathing. Since the configuration is such that the transmitting side can be held at the same time, it is effective in preventing malfunctions of VOX control both during transmission and reception.
第１図は本考案の一実施例を示すブロツク図、
第２図、第３図は本考案のマイクアンプ回路のゲ
イン制御回路例である。
１……中間周波回路Ｆ、２……検波器Det、
３……スケルチゲートSqG、４……低周波増幅器
AF、５……スピーカSp、６……スケルチ検出器
SqD、７……マイクロホンＭ、８……マイクアン
プ回路、９……変調器Mod、１０……VOX制御
部。
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIGS. 2 and 3 are examples of gain control circuits for the microphone amplifier circuit of the present invention. 1...Intermediate frequency circuit F, 2...Detector Det,
3...Squelch gate SqG, 4...Low frequency amplifier
AF, 5...Speaker SP, 6...Squelch detector
SqD, 7...Microphone M, 8...Mic amplifier circuit, 9...Modulator Mod, 10...VOX control section.
Claims (1)
とを比較してマイクアンプ出力が大きいと受信側
から送信側に切換えるVOX信号を出力するVOX
制御回路を備えたFM送受信機において、前記マ
イクアンプ回路は制御信号で出力を減衰する減衰
制御手段を有し、受信回路のスケルチ信号を制御
信号として前記減衰制御手段に供給するよう接続
して、受信状態でのスケルチ信号による制御で前
記マイクアンプ回路出力を減衰させてVOX信号
の受信側選択状態を保持させることを特徴とする
VOX誤動作防止回路。 VOX outputs a VOX signal that compares the output of the microphone amplifier circuit and the receiving side audio output signal and switches from the receiving side to the transmitting side if the microphone amplifier output is large.
In the FM transceiver equipped with a control circuit, the microphone amplifier circuit has attenuation control means for attenuating the output with a control signal, and is connected to supply a squelch signal of the reception circuit to the attenuation control means as a control signal, The microphone amplifier circuit output is attenuated by control using a squelch signal in a receiving state to maintain a VOX signal receiving side selection state.
VOX malfunction prevention circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982170225U JPS5973856U (en) | 1982-11-10 | 1982-11-10 | VOX malfunction prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982170225U JPS5973856U (en) | 1982-11-10 | 1982-11-10 | VOX malfunction prevention circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5973856U JPS5973856U (en) | 1984-05-19 |
| JPH0326704Y2 true JPH0326704Y2 (en) | 1991-06-10 |
Family
ID=30371664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1982170225U Granted JPS5973856U (en) | 1982-11-10 | 1982-11-10 | VOX malfunction prevention circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5973856U (en) |
-
1982
- 1982-11-10 JP JP1982170225U patent/JPS5973856U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5973856U (en) | 1984-05-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6782106B1 (en) | Apparatus and method for transmitting sound | |
| US3963868A (en) | Loudspeaking telephone hysteresis and ambient noise control | |
| US4819263A (en) | Apparatus and method for hands free telephonic communication | |
| JP2634946B2 (en) | Hands-free auxiliary circuit | |
| JP4400490B2 (en) | Loudspeaker equipment, loudspeaker system | |
| JPH0326704Y2 (en) | ||
| JPS61195054A (en) | Voice switching circuit for loudspeaking telephone set | |
| JPS63272254A (en) | Telephone system | |
| JPH01252053A (en) | Transmitting tone control device for hands free phone | |
| JP2636897B2 (en) | Hands-free communication circuit | |
| JP2979056B2 (en) | Cordless telephone with interphone | |
| JPH01232864A (en) | Loudspeaker telephone set | |
| JPS61195055A (en) | Voice switching circuit for loudspeaking telephone set | |
| JPS61195048A (en) | Voice switch circuit of loudspeaking telephone set | |
| JPS6331142B2 (en) | ||
| JPS60169235A (en) | Talking system | |
| JPH08237381A (en) | Public address call device | |
| CA1288187C (en) | Apparatus and method for hands free telephonic communication | |
| JPS59111425A (en) | Conference telephone set | |
| JPS6247251A (en) | Control circuit for loudspeaking call | |
| JPS6179347A (en) | Loudly speaking telephone device | |
| JPS6297458A (en) | Loudnspeaking call control circuit | |
| JPH01154699A (en) | Wireless telemeter | |
| JPH0242266B2 (en) | ||
| JPS62180645A (en) | Telephone set with hand-free function |