JPS6055188U

JPS6055188U - audio circuit

Info

Publication number: JPS6055188U
Application number: JP14557983U
Authority: JP
Inventors: 川畑　照男
Original assignee: Fujitsu General Ltd
Current assignee: Fujitsu General Ltd
Priority date: 1983-09-20
Filing date: 1983-09-20
Publication date: 1985-04-18

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は本考案の音声回路の一実施例の回路図、第２図
は音声回路の別の実施例の回路図、第３図は周波数特性
図である。１・・・音声信号の入力端子、２・・・音質調整回路、
３・・・音声出力回路、４・・・内部スピーカ用負帰還
回路、５・・・外部スピーカ用負帰還回路、６・・・内
部スピーカ、７・・・外部スピーカ、８・・・スピーカ
切換用のスイッチ、９・・・内部スピーカ用時定数回路
、１０・・・外部スピーカ用時定数回路、１１・・・時
定数切換用のスイッチ、１２・・・スピーカ切換用のス
イッチ、１３・・・負帰還回路。Ｏ実用新案登録請求の範囲（１）内部スピーカと外部スピーカを切換手段により切
り換えることにより選択できるようにした音声回路にお
いて、上記切換手段の切換動作に連動して周波数特性が
切り換わるようにしたことを特徴とする音声回路。（２）上記周波数特性の切り換えが、音声出力回路の負
帰還回路の定数の切り換えにより行なわれるようにした
ことを特徴とする実用新案登録請求の範囲第１項記載の
音声回路。（３）　　上記周波数特性の切り換えが、音質調整回路
の定数の切り換えにより行なわれるようにしたことを特
徴とする実用新案登録請求の範囲第１項記載の音声回路
。図面の簡単な説明第１図は本考案の音声回路の一実施例の回路図、第２図
は音声回路の別の実施例の回路図、第３図は周波数特性
図である。１・・・音声信号の入力端子、２・・・音質調整回路、
３・・・音声出力回路、４・・・内部スピーカ用負帰還
回路、５・・・外部スピーカ用負帰還回路、６・・・内
部スピーカ、７・・・外部スピーカ、８・・・スピーカ
切換用のスイッチ、９・・・内部スピーカ用時定数回路
、１０・・・外部スピーカ用時定数回路、１１・・・時
定数切換用のスイッチ、１２・・・スピーカ切換用のス
イッチ、１３・・・負帰還回路。FIG. 1 is a circuit diagram of one embodiment of the audio circuit of the present invention, FIG. 2 is a circuit diagram of another embodiment of the audio circuit, and FIG. 3 is a frequency characteristic diagram. 1... Audio signal input terminal, 2... Sound quality adjustment circuit,
3... Audio output circuit, 4... Negative feedback circuit for internal speaker, 5... Negative feedback circuit for external speaker, 6... Internal speaker, 7... External speaker, 8... Speaker switching 9... Time constant circuit for internal speaker, 10... Time constant circuit for external speaker, 11... Switch for time constant switching, 12... Switch for speaker switching, 13...・Negative feedback circuit. O Utility Model Registration Claims (1) In an audio circuit in which an internal speaker and an external speaker can be selected by switching between them using a switching means, the frequency characteristics are switched in conjunction with the switching operation of the switching means. An audio circuit featuring: (2) The audio circuit according to claim 1, wherein the switching of the frequency characteristics is performed by switching a constant of a negative feedback circuit of the audio output circuit. (3) The audio circuit according to claim 1, wherein the switching of the frequency characteristics is performed by switching a constant of a sound quality adjustment circuit. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of one embodiment of the audio circuit of the present invention, FIG. 2 is a circuit diagram of another embodiment of the audio circuit, and FIG. 3 is a frequency characteristic diagram. 1... Audio signal input terminal, 2... Sound quality adjustment circuit,
3... Audio output circuit, 4... Negative feedback circuit for internal speaker, 5... Negative feedback circuit for external speaker, 6... Internal speaker, 7... External speaker, 8... Speaker switching 9... Time constant circuit for internal speaker, 10... Time constant circuit for external speaker, 11... Switch for time constant switching, 12... Switch for speaker switching, 13...・Negative feedback circuit.

Claims

[Scope of utility model registration request]

(1) An audio circuit in which an internal speaker and an external speaker can be selected by switching between them using a switching means, characterized in that the frequency characteristics are switched in conjunction with the switching operation of the switching means.

(2) The audio circuit according to claim 1, wherein the switching of the frequency characteristics is performed by switching a constant of a negative feedback circuit of the audio output circuit.

(3) The audio circuit according to claim 1, wherein the switching of the frequency characteristics is performed by switching a constant of a sound quality adjustment circuit.