JPH07193767A - Sound muting device - Google Patents
Sound muting deviceInfo
- Publication number
- JPH07193767A JPH07193767A JP5333389A JP33338993A JPH07193767A JP H07193767 A JPH07193767 A JP H07193767A JP 5333389 A JP5333389 A JP 5333389A JP 33338993 A JP33338993 A JP 33338993A JP H07193767 A JPH07193767 A JP H07193767A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- mpu
- sound
- video
- 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
Landscapes
- Television Receiver Circuits (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、選局、音量制御用の出
力信号機能を有したMPUを内蔵したテレビジョン放送
受信装置に使用する音声ミュートに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio mute used in a television broadcast receiving apparatus having a built-in MPU having output signal functions for channel selection and volume control.
【0002】[0002]
【従来の技術】音声信号のミュート時には単に信号をオ
ンオフするのみで、滑らかに信号を無くし、またミュー
ト解除時には滑らかに信号が復帰する構成をとっない回
路では必ず切換えショック音が出る。従来技術として提
案されている特開平2−55427公報では時定数を切
換えているがこれはショック音をなくすためのものでは
ない。また特開昭61−265978公報においてはト
ランジスタ8で信号をアースに落としているため問題と
なるショック音がでる。この様に従来の音声ミュート装
置はトランジスターを使用し音量制御の直流電圧を下げ
たり、信号そのものを落としたりしていたため、時定数
により、動作時のショック音やミュート解除時に音声が
出るのが若干遅延する等の欠点があった。2. Description of the Related Art A circuit does not have a configuration in which a signal is smoothly turned on and off when the audio signal is muted to smoothly eliminate the signal, and when the mute is released, the signal is smoothly restored. In Japanese Patent Laid-Open No. 2-55427 proposed as a prior art, the time constant is switched, but this is not for eliminating the shock noise. Further, in Japanese Patent Application Laid-Open No. 61-265978, since a signal is dropped to the ground by the transistor 8, a problematic shock sound is produced. In this way, the conventional audio mute device uses a transistor to lower the DC voltage for volume control and to drop the signal itself, so due to the time constant, a shock sound during operation or sound when releasing mute is slightly generated. There was a defect such as delay.
【0003】図2は従来の音声ミュート装置の構成回路
例を示す。水平出力パルスと同期信号が映像、同期分離
のためのICに加えられ水平出力パルスと同期信号の位
相を検出し水平パルスのある期間に同期信号の大きさが
ある一定値以上あるかどうかを検出するロック検出回路
の信号が、コンデンサー2で積分され直流電圧にされた
信号が選局時の信号の有無の情報として、MPU(マイ
クロプロセッサユニット)5に加えられる。抵抗3、4
はビデオ同期分離1のロック検出回路の負荷インピーダ
ンスであるとともにMPU5への入力電圧調整もしてい
る。音声ミュートのためにビデオ同期分離1のロック検
出回路の出力信号をトランジスタ11でインピーダンス
変換し、トランジスター17に加えMPU5の音量制御
電圧を低下させることによりスピーカーの出力をでなく
する。抵抗12はエミッターフォロアーのエミッター抵
抗で、抵抗13、16はトランジスター17を適正にオ
ンオフさせるための分圧抵抗である。14は電源であ
る。電解コンデンサー15はトランジスター17が急峻
にオンすると、ショック音がスピーカー8より出力され
るのでそれを防止するために時定数をもたすためであ
る。このためミュートが解除されても音声は若干遅れて
出力される。音量コントロール6はMPU5の電圧によ
り音声信号の出力振幅を変え次段のパワーアンプ7に加
えてスピーカー8より音声が出力される。FIG. 2 shows an example of a circuit configuration of a conventional audio mute device. The horizontal output pulse and the sync signal are applied to the IC for video and sync separation, and the phase of the horizontal output pulse and the sync signal is detected to detect whether the magnitude of the sync signal exceeds a certain value during a certain period of the horizontal pulse. The signal of the lock detecting circuit is added to the MPU (microprocessor unit) 5 as the information on the presence / absence of the signal when the signal integrated by the capacitor 2 and converted into the DC voltage is selected. Resistance 3, 4
Is the load impedance of the lock detection circuit of the video sync separation 1 and also adjusts the input voltage to the MPU 5. For audio mute, the output signal of the lock detection circuit of the video sync separation 1 is impedance-converted by the transistor 11 and the volume control voltage of the MPU 5 in addition to the transistor 17 is lowered to eliminate the speaker output. The resistor 12 is an emitter resistor of the emitter follower, and the resistors 13 and 16 are voltage dividing resistors for appropriately turning on and off the transistor 17. 14 is a power supply. This is because the electrolytic capacitor 15 has a time constant in order to prevent a shock sound from being output from the speaker 8 when the transistor 17 is turned on abruptly. Therefore, even if the mute is released, the sound is output with a slight delay. The volume control 6 changes the output amplitude of the audio signal according to the voltage of the MPU 5, and the audio is output from the speaker 8 in addition to the power amplifier 7 in the next stage.
【0004】[0004]
【発明が解決しようとする課題】しかし上記構成は回路
構成の部品点数が多く映像に比較して音声が遅れて出力
される。本発明は部品点数を削減すると同時に音声ミュ
ートの動作時のショック音もなく、ミュート解除時には
映像と同時に音声も出力できるようにすることを目的と
する。However, in the above configuration, the number of parts in the circuit configuration is large and the sound is output later than the video. It is an object of the present invention to reduce the number of parts, and at the same time, to make it possible to output a shock sound at the time of operation of audio mute, and to output audio at the same time as video when releasing mute.
【0005】[0005]
【課題を解決するための手段】選局、音量制御用の出力
信号機能を有するMPUが搭載されたテレビジョン受信
装置は、選局をするために同期信号の有無の情報をMP
Uに送っている。音量制御用の出力信号もそのMPUが
有しているので、無信号時や同期が不安定になる様な電
界強度時には、同期信号もなくなるか大きさが小さくな
るのでこの情報を使用して映像の出力される時と同期し
て音声をミュートしたものを解除する。A television receiver equipped with an MPU having an output signal function for channel selection and volume control uses an information indicating the presence / absence of a sync signal to select a channel.
I'm sending it to U. Since the output signal for volume control is also included in the MPU, when there is no signal or when the electric field strength is such that the synchronization becomes unstable, the synchronization signal also disappears or the size decreases. Cancel the muted sound in synchronization with the output of.
【0006】[0006]
【作用】本発明は放送が終了時点や、弱電界時等に耳障
りな音声ノイズがなくなり信号の有無に同期した滑らか
な音声ミュートと同時に回路の簡素化が可能になる。The present invention eliminates annoying audio noise at the end of broadcasting or when a weak electric field is generated, and enables smooth audio muting synchronized with the presence or absence of a signal and simplification of the circuit.
【0007】[0007]
【実施例】以下本発明の一実施例の音声ミュート装置を
図面と共に説明する。図1に本発明の一実施例を示す。
水平出力パルスと同期信号が映像、同期分離のためのI
C1に加えられ水平出力パルスと同期信号の位相を検出
したロック検出回路の信号が、コンデンサー2で積分さ
れ直流電圧にされた信号が抵抗3、4で分圧され選局時
の信号の有無の情報として、MPU5に加えられる。抵
抗3、4で分圧された電圧がMPU5で定められたある
しきい値以上になるとMPU5の音量コントロール電圧
をゼロにし音量コントロール6の信号出力をなくすこと
により音声ミュートをかける。またMPU5は映像を出
力する時もコントロールしているので映像信号の出力さ
れる時と同期して音声が出力されるように音量をコント
ロールできる。抵抗9と電解コンデンサー10で音量コ
ントロール6に加える電圧を滑らかに変化させることに
より音声信号が急峻に途切れたり出力されたりする時に
発生するショック音を無くしている。また、出力をなく
すのでなく20dB絞りたいときにはMPU5の出力電
圧をゼロでなく適正にすれば良い。DESCRIPTION OF THE PREFERRED EMBODIMENTS An audio mute device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention.
Horizontal output pulse and sync signal are video and I for sync separation
The signal of the lock detection circuit, which is added to C1 and detects the phase of the horizontal output pulse and the synchronizing signal, is integrated by the capacitor 2 and the signal converted into the DC voltage is divided by the resistors 3 and 4, and the presence or absence of the signal at the time of tuning is detected. It is added to the MPU 5 as information. When the voltage divided by the resistors 3 and 4 exceeds a certain threshold value determined by the MPU 5, the sound volume control voltage of the MPU 5 is set to zero and the signal output of the sound volume control 6 is eliminated to mute the sound. Further, since the MPU 5 also controls the output of the video, the volume can be controlled so that the audio is output in synchronization with the output of the video signal. By smoothly changing the voltage applied to the volume control 6 with the resistor 9 and the electrolytic capacitor 10, the shock sound generated when the audio signal is suddenly interrupted or output is eliminated. Further, when it is desired to reduce the output by 20 dB instead of eliminating the output, the output voltage of the MPU 5 may be set to an appropriate value instead of zero.
【0008】[0008]
【発明の効果】以上のように本発明によれば、音声ミュ
ートのタイミングはMPUのソフトで映像との同期を考
慮しながら適正に選ぶことができ、ショック音もなく回
路の簡略化も図れる。As described above, according to the present invention, the timing of the audio mute can be appropriately selected by considering the synchronization with the image by the software of the MPU, and there is no shock sound and the circuit can be simplified.
【図1】本発明の一実施例における音声ミュート装置の
回路図FIG. 1 is a circuit diagram of an audio mute device according to an embodiment of the present invention.
【図2】従来の音声ミュート装置の回路図FIG. 2 is a circuit diagram of a conventional audio mute device.
1 ビデオ、同期分離IC 2 コンデンサー 3 抵抗 4 抵抗 5 IC(MPU) 6 音量制御IC 7 音声電力増幅IC 8 スピーカー 9 抵抗 10 電解コンデンサー 1 Video and sync separation IC 2 Capacitor 3 Resistor 4 Resistor 5 IC (MPU) 6 Volume control IC 7 Audio power amplification IC 8 Speaker 9 Resistor 10 Electrolytic capacitor
Claims (1)
局、音量制御用の出力信号機能を持つマイクロプロセッ
サユニットに接続し、テレビ放送受信時や外部入力時に
無信号になった場合,または映像は見えるがノイジーに
なり同期が不安定な電界強度になった場合の少なくとも
いづれか一方の場合に音声ミュートをかけることを特徴
とする音声ミュート装置。1. When the presence or absence of a synchronization signal is detected, the output is connected to a microprocessor unit having an output signal function for channel selection and volume control, and when there is no signal at the time of receiving a television broadcast or external input, Alternatively, an audio muting device which performs audio muting in at least one of a case where an image can be seen but is noisy and the synchronization becomes unstable electric field strength.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5333389A JPH07193767A (en) | 1993-12-27 | 1993-12-27 | Sound muting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5333389A JPH07193767A (en) | 1993-12-27 | 1993-12-27 | Sound muting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH07193767A true JPH07193767A (en) | 1995-07-28 |
Family
ID=18265575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5333389A Pending JPH07193767A (en) | 1993-12-27 | 1993-12-27 | Sound muting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07193767A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007049238A (en) * | 2005-08-05 | 2007-02-22 | Victor Co Of Japan Ltd | Digital broadcast receiver |
JP2009053297A (en) * | 2007-08-24 | 2009-03-12 | Sanyo Electric Co Ltd | Music recording device |
-
1993
- 1993-12-27 JP JP5333389A patent/JPH07193767A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007049238A (en) * | 2005-08-05 | 2007-02-22 | Victor Co Of Japan Ltd | Digital broadcast receiver |
JP4661443B2 (en) * | 2005-08-05 | 2011-03-30 | 日本ビクター株式会社 | Digital broadcast receiver |
JP2009053297A (en) * | 2007-08-24 | 2009-03-12 | Sanyo Electric Co Ltd | Music recording device |
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