JPH0244500U

JPH0244500U -

Info

Publication number: JPH0244500U
Application number: JP12267588U
Authority: JP
Priority date: 1988-09-21
Filing date: 1988-09-21
Publication date: 1990-03-27

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例のスーパーウーハ回
路を示すブロツク図、第２図は入力音声帯域が低
域まで伸びている場合の周波数特性を示す説明図
、第３図は入力音声帯域が中高域のみで低域が無
い場合の周波数特性を示す説明図、第４図は第１
図の音量制御部の具体的回路の一例を示す回路図
、第５図は第４図の動作を説明する説明図、第６
図は従来のスーパーウーハ回路を示すブロツク図
である。１……左信号入力端子、２……右信号入力端子
、７……加算回路、８……ローパスフイルタ、９
……音量制御部、１０……アンプ、１１……スー
パーウーハ用スピーカ、１２……スイツチング回
路部、１３……レベル検出部、１４……基準電圧
発生部。 Fig. 1 is a block diagram showing a super woofer circuit according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing frequency characteristics when the input audio band extends to low frequencies, and Fig. 3 is an explanatory diagram showing the frequency characteristics when the input audio band extends to low frequencies. An explanatory diagram showing the frequency characteristics when there is only a mid-high range and no low range, Figure 4 is the first
5 is a circuit diagram showing an example of a specific circuit of the volume control section shown in FIG.
The figure is a block diagram showing a conventional superwoofer circuit. 1...Left signal input terminal, 2...Right signal input terminal, 7...Addition circuit, 8...Low pass filter, 9
... Volume control section, 10 ... Amplifier, 11 ... Super woofer speaker, 12 ... Switching circuit section, 13 ... Level detection section, 14 ... Reference voltage generation section.

Claims

[Claim for Utility Model Registration] A low-pass filter that extracts a low-frequency audio signal from an audio signal supplied as an input, and a level detection means that detects the level of the low-frequency audio signal extracted by the low-pass filter and compares it with a reference value. and on/off control of outputting the low-frequency audio signal from the low-pass filter to the super woofer speaker based on the comparison result by the level detection means, and the detected signal level is the standard. If the detected signal level is smaller than the reference value, it is turned on to output the low-frequency audio signal from the low-pass filter as a speaker output, and when the detected signal level is lower than the reference value, it is turned off and the low-frequency audio signal from the low-pass filter is output to the speaker. A super woofer circuit comprising: a switch means for stopping output to the woofer;