JPS6035624U

JPS6035624U - automatic volume adjustment device

Info

Publication number: JPS6035624U
Application number: JP12783083U
Authority: JP
Inventors: 大河原　憲一
Original assignee: 山水電気株式会社
Priority date: 1983-08-18
Filing date: 1983-08-18
Publication date: 1985-03-12

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図は本考案による実施例の全体的な構成を表わした
ブロック図、第２図は本考案による実施例の動作を説明
するための特性図である。１．２・・・入力端子、３・・・出力端子、ＢＰＦ□〜
ＢＰＦｎ、ＢＰＦ、’　〜ＢＰＦｎ’　・・・帯域通過
フィルタ、ＶＣＡ、〜ＶＣＡｎ・・・電圧可変増幅器、
ＣＯＭＰ１〜ＣＯＭＰｎ・・・比較器、ＡＭＰ１〜ＡＭ
Ｐｎ・・・バッファ増幅器。FIG. 1 is a block diagram showing the overall configuration of an embodiment according to the present invention, and FIG. 2 is a characteristic diagram for explaining the operation of the embodiment according to the present invention. 1.2...Input terminal, 3...Output terminal, BPF□~
BPFn, BPF, '~BPFn'... Bandpass filter, VCA, ~VCAn... Voltage variable amplifier,
COMP1~COMPn... Comparator, AMP1~AM
Pn...Buffer amplifier.

Claims

[Scope of utility model registration request]

(1) Automatic volume adjustment characterized by comparing the audio signal level and noise signal level for each of multiple frequency bands, and amplifying only the frequency components of the audio signal that are below the noise level to the same level or higher than the noise level. Device.

(2) The automatic volume adjustment device according to claim 1, wherein the audio signal and the noise signal are divided into the plurality of frequency bands by a plurality of bandpass filters.

(3) A plurality of parallel-connected first band-pass filters into which audio signals are input, and a plurality of parallel-connected first band-pass filters into which noise signals are input, which are provided corresponding to each first band-pass filter. a plurality of variable gain means to which the output of the first bandpass filter is added; and a plurality of variable gain means for comparing the output of each of the variable gain means and the output of each of the second bandpass filters. a variable means, and when the output of the second band-pass filter becomes larger than the output of each variable gain means, the gain of the variable gain means is increased in accordance with the magnitude thereof. The automatic volume adjustment device according to item 1.

(4) Utility model registration claim 2, characterized in that the filter characteristics of the plurality of first bandpass filters and the corresponding ones of the plurality of second bandpass filters are the same. automatic volume adjustment device.