JPS606333U

JPS606333U - Automotive automatic volume and sound quality control device

Info

Publication number: JPS606333U
Application number: JP9767483U
Authority: JP
Inventors: 利仁澤井
Original assignee: 富士通テン株式会社
Priority date: 1983-06-24
Filing date: 1983-06-24
Publication date: 1985-01-17

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は時速８０ｋｍ／ｈで走行中に窓を開けて車室内
の騒音レベルを測定した結果を示す線図、第２図はこの
考案の一実施例の要部ブロック図、第３図は実施例のマ
スキング防止処理の説明図、第４図は第３図のより具体
的な構成を示す電気回路図、第５図は騒音レベル検出回
路の別の実施例のブロック図、第６図は騒音レベル検出
回路の更に別の実施例のブロック図である。１０はカセットデツキやラジオ等のオーディオ信号発生
部、１１，１３．１９は電子ボリューム、１２はミサキ
回路、１８はローパスフィルタ、２１はウーファ、２２
はマイクロフォン、２４はバンドパスフィルタ、２６．
２７はゲイン調整回路である。Figure 1 is a diagram showing the results of measuring the noise level inside the vehicle while driving at 80 km/h with the windows open, Figure 2 is a block diagram of the main parts of an embodiment of this invention, and Figure 3 is 4 is an electric circuit diagram showing a more specific configuration of FIG. 3, FIG. 5 is a block diagram of another embodiment of the noise level detection circuit, and FIG. 6 is an explanatory diagram of the masking prevention process of the embodiment. FIG. 6 is a block diagram of yet another embodiment of the noise level detection circuit. 10 is an audio signal generator such as a cassette deck or radio, 11, 13, 19 is an electronic volume, 12 is a Misaki circuit, 18 is a low-pass filter, 21 is a woofer, 22
24 is a microphone, 24 is a bandpass filter, 26.
27 is a gain adjustment circuit.

Claims

[Scope of utility model registration request]

an audio signal level adjustment circuit that changes the level of the demodulated audio signal according to a control signal and outputs it; a first speaker that converts the output signal of the audio signal level adjustment circuit into sound; a filter for extracting frequency components, a low-frequency signal level adjustment circuit for changing the output level of the filter according to a control signal and outputting it, and converting the output signal of the low-frequency signal level adjustment circuit into sound. a second speaker, a noise level detection circuit that outputs a signal according to the noise level, and a first speaker that generates the control signal to be applied to the audio signal level adjustment circuit based on the output of the noise level detection circuit. a gain adjustment circuit; and generating a control signal to cause the low-frequency signal level adjustment circuit to increase the volume level by an amount greater than the amount of volume level increase by the first gain adjustment circuit; 1. A vehicle-mounted automatic volume sound quality control device, comprising: a second gain adjustment circuit;