JPS6233398Y2 - - Google Patents
Info
- Publication number
- JPS6233398Y2 JPS6233398Y2 JP3649481U JP3649481U JPS6233398Y2 JP S6233398 Y2 JPS6233398 Y2 JP S6233398Y2 JP 3649481 U JP3649481 U JP 3649481U JP 3649481 U JP3649481 U JP 3649481U JP S6233398 Y2 JPS6233398 Y2 JP S6233398Y2
- Authority
- JP
- Japan
- Prior art keywords
- microcomputer
- muting
- reset
- audio
- turned
- 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
- 239000003990 capacitor Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Amplifiers (AREA)
- Noise Elimination (AREA)
Description
【考案の詳細な説明】
＜産業上の利用分野＞
本考案はテレビ受像機、ラジオ受信機或いは
VTR等の音響機器又は映像機器に用いられるミ
ユーテイング装置に係る。[Detailed description of the invention] <Industrial field of application> The invention is applicable to television receivers, radio receivers,
It relates to muting devices used in audio equipment or video equipment such as VTRs.
＜従来の技術＞
最近各種の機器にマイクロコンピユータ（以下
マイコンと略称する）を搭載して種々の機能を持
たせ高付加価値化する傾向にある。<Prior Art> Recently, there has been a trend to incorporate microcomputers (hereinafter abbreviated as microcomputers) into various types of equipment to provide them with various functions and provide high added value.
テレビ受像機やVTR等の映像機器においても
例外ではなく、マイコンを搭載した機種が増加し
ている。 Video equipment such as television receivers and VTRs is no exception, and the number of models equipped with microcontrollers is increasing.
このようにマイコンを搭載した従来の音響機器
又は映像機器例えば、シヤープ(株)製SM−３型マ
イクロコンピユータを使用した同社製VTR、VC
−7000，7200等においては、電源オン直後の不快
感を除去するため、通常電源オン時にマイコンリ
セツトパルス発生回路より得られるリセツトパル
スをマイコンのリセツト端子に加えてまずマイコ
ンを一旦リセツトし、このときマイコンより得ら
れるミユーテイングパルスを音声回路のミユーテ
イング端に供給して当該機器内の全回路が安定に
動作するまでの間、音声出力をミユートしてい
た。 Conventional audio or video equipment equipped with microcomputers such as Sharp Corporation's VTRs and VCs using the SM-3 microcomputer manufactured by Sharp Corporation.
-7000, 7200, etc., in order to eliminate the discomfort immediately after the power is turned on, the reset pulse obtained from the microcomputer reset pulse generation circuit is applied to the reset terminal of the microcomputer when the power is normally turned on, and the microcomputer is reset once. A muting pulse obtained from a microcomputer is supplied to the muting end of an audio circuit, and the audio output is muted until all circuits within the device operate stably.
＜考案が解決しようとする問題点＞
しかし乍らこのようにマイコンからの出力パル
スによつてミユーテイング動作を行なわせる場合
には、予めマイコンにその内容をプログラムして
おく必要があり、また電源オン直後のマイコンが
始動するまでの間はやはりミユーテイング動作が
行なわれないという欠点があつた。<Problems that the invention aims to solve> However, when performing muting operations using output pulses from a microcomputer, it is necessary to program the contents into the microcomputer in advance, and the There was also a drawback in that the muting operation was not performed until the microcomputer immediately after started up.
＜考案の目的＞
本考案はこのような点に鑑みなされたものであ
り、マイコンを搭載した音響機器又は映像機器に
おいて、簡単な構成を付加することによつて電源
オン直後のミユーテイング動作を確実に行なうこ
とができるミユーテイング装置を提供するもので
ある。<Purpose of the invention> The present invention was devised in view of the above points, and it is possible to ensure the muting operation immediately after the power is turned on by adding a simple configuration to audio equipment or video equipment equipped with a microcomputer. The present invention provides a mutating device capable of performing mutating.
＜実施例＞
以下図面に示す実施例に従つて本考案を説明す
る。図面において１は抵抗R1，R2，R3、コンデ
ンサC1，C2、ダイオードD1、トランジスタQ1よ
りなるリセツトパルス発生回路であり、該発生回
路１では電源オン直後にトランジスタQ1が一時
的にオンされ、コンデンサC1への充電が完了す
るとともにオフされる。このとき該トランジスタ
Q1のコレクタからは正のパルス電圧が導出さ
れ、これがリセツトパルスとしてマイコン２のリ
セツト端子に供給され、こうしてマイコン２は電
源オンとともにその都度リセツトされる。<Example> The present invention will be described below according to an example shown in the drawings. In the drawing, reference numeral 1 indicates a reset pulse generating circuit consisting of resistors R 1 , R 2 , R 3 , capacitors C 1 , C 2 , diode D 1 , and transistor Q 1 . It is turned on temporarily and turned off when charging of capacitor C1 is completed. At this time, the transistor
A positive pulse voltage is derived from the collector of Q1 , which is supplied as a reset pulse to the reset terminal of the microcomputer 2, and thus the microcomputer 2 is reset each time the power is turned on.
ここでは特にこのリセツトパルス発生回路１よ
り得られるリセツトパルスがダイオードD2を介
して音声回路３のミユーテイング端子３にも供給
され、この間音声回路３からの音声出力が消失さ
れる。この結果スピーカ４からの電源オン直後の
不快な異常音の発生が確実に防止される。 Here, in particular, the reset pulse obtained from the reset pulse generating circuit 1 is also supplied to the muting terminal 3 of the audio circuit 3 via the diode D2, and during this time the audio output from the audio circuit 3 is eliminated. As a result, the generation of unpleasant abnormal sounds from the speaker 4 immediately after the power is turned on is reliably prevented.
＜考案の効果＞
以上のように本考案によれば、マイコンを搭載
した音響機器又は映像機器において、電源オン時
にマイコンの内容のリセツト用として用いられて
いるリセツトパルス発生回路から得られるリセツ
トパルスを音声回路のミユーテイング端子にも供
給しているため、新たにミユーテイングパルス発
生回路を設けなくとも上記リセツトパルスを使用
してミユーテイング動作を行なわせることがで
き、しかも電源オン時の確実なミユーテイング動
作が可能となる。<Effects of the invention> As described above, according to the invention, in audio equipment or video equipment equipped with a microcomputer, the reset pulse obtained from the reset pulse generation circuit used for resetting the contents of the microcomputer when the power is turned on can be reset. Since it is also supplied to the muting terminal of the audio circuit, the above-mentioned reset pulse can be used to perform the muting operation without installing a new muting pulse generation circuit, and moreover, the muting operation can be performed reliably when the power is turned on. It becomes possible.
図面は本考案の１実施例の回路構成図である。
１……リセツトパルス発生回路、２……マイコ
ン、３……音声回路。
The drawing is a circuit diagram of one embodiment of the present invention. 1...Reset pulse generation circuit, 2...Microcomputer, 3...Audio circuit.
Claims (1)
くは映像機器において、電源オン時にリセツトパ
ルス発生回路より得られるリセツトパルスをマイ
クロコンピユータのリセツト端子に供給するとと
もにミユーテイングパルスとして音声回路のミユ
ーテイング端子に供給してなるミユーテイング装
置。 A muting device for audio equipment or video equipment equipped with a microcomputer, which supplies a reset pulse obtained from a reset pulse generation circuit when the power is turned on to the reset terminal of the microcomputer, and also supplies it as a muting pulse to the muting terminal of the audio circuit. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3649481U JPS6233398Y2 (en) | 1981-03-13 | 1981-03-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3649481U JPS6233398Y2 (en) | 1981-03-13 | 1981-03-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57148936U JPS57148936U (en) | 1982-09-18 |
| JPS6233398Y2 true JPS6233398Y2 (en) | 1987-08-26 |
Family
ID=29833733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3649481U Expired JPS6233398Y2 (en) | 1981-03-13 | 1981-03-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6233398Y2 (en) |
-
1981
- 1981-03-13 JP JP3649481U patent/JPS6233398Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57148936U (en) | 1982-09-18 |
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