JPS643294U

JPS643294U -

Info

Publication number: JPS643294U
Application number: JP9353487U
Authority: JP
Priority date: 1987-06-18
Filing date: 1987-06-18
Publication date: 1989-01-10

Description

[Brief explanation of the drawing]

第１図は本考案の音場拡大回路の一実施例、第
２図は本考案に使用される外部スピーカーの接続
関係を示す図、第３図はラジオ付テープレコーダ
ーの斜視図である。主な図番の説明、７……左チヤンネル用第１ス
ピーカー、８……左チヤンネル用第２スピーカー
、９……右チヤンネル用第１スピーカー、１０…
…右チヤンネル用第２スピーカー、１１……第１
ジヤツク、１２……第２ジヤツク、１３……第１
プラグ、１４……第２プラグ、１５……左チヤン
ネル用外部スピーカー、１９……右チヤンネル用
外部スピーカー、２３……左チヤンネル用増幅回
路、２４……右チヤンネル用増幅回路、２５……
第１音場拡大用スイツチ、２６……第２音場拡大
用スイツチ、２７……第３音場拡大用スイツチ、
２８……第１コンデンサー、２９……第２コンデ
ンサー、３４……第１切換スイツチ、３７……第
２切換スイツチ。 FIG. 1 is an embodiment of the sound field expansion circuit of the present invention, FIG. 2 is a diagram showing the connection relationship of external speakers used in the present invention, and FIG. 3 is a perspective view of a tape recorder with a radio. Explanation of main drawing numbers, 7...1st speaker for left channel, 8...2nd speaker for left channel, 9...1st speaker for right channel, 10...
...2nd speaker for right channel, 11 ...1st
Jack, 12 ...2nd Jack, 13...1st
Plug, 14...Second plug, 15...External speaker for left channel, 19...External speaker for right channel, 23...Amplification circuit for left channel, 24...Amplification circuit for right channel, 25...
1st sound field expansion switch, 26...2nd sound field expansion switch, 27...3rd sound field expansion switch,
28...First capacitor, 29...Second capacitor, 34 ...First changeover switch, 37 ...Second changeover switch.

Claims

[Scope of utility model registration request]

In a stereo sound device having left and right channels and equipped with speakers that emit signals of the left and right channels, a left channel amplifier circuit receives a left channel signal and amplifies the signal, and a right channel signal is provided. a right channel amplification circuit that amplifies the signal as it is input; first, second, and third sound field expansion switches that are switched in conjunction with the sound field expansion operation; and external speakers for sound field expansion. When the plug is inserted and the first sound field expansion switch is switched during the sound field expansion operation, the first sound field expansion switch is connected in series between the output terminal of the left channel amplifier circuit and the output terminal of the right channel amplifier circuit. and a second jack, and said first
a first changeover switch that is switched by the operation of attaching and removing the plug to the jack; a second changeover switch that is switched by the operation of attaching and detaching the plug to the second jack; and a left channel to which the output signal of the left channel amplifier circuit is applied. a first speaker for
A second speaker for the left channel to which the output signal of the amplification circuit for the left channel is applied, a second speaker for the left channel having a smaller diameter than the first speaker for the left channel, and a second speaker for the right channel to which the output signal of the amplification circuit for the right channel is applied. 1 speaker, and a second right channel speaker to which the output signal of the right channel amplifier circuit is applied and which has a smaller diameter than the first right channel speaker, is in a sound field expansion operation state, and is in a sound field expansion operation state, and When the external speaker plugs are inserted into the first jack and the second jack, the second left channel speaker and the right channel second speaker are used as treble speakers and are in a sound field expansion operation state, and When a plug is not inserted into at least one of the first jack and the second jack, the second speaker for the left channel and the second speaker for the right channel are used as speakers for expanding a sound field. A distinctive stereo sound device.