On-board vehicle automatic sound volume adjusting apparatus
AssigneePioneer Electronic Corporation
InventorsShinjiro Kato, Hisashi Kihara, Fumio Tamura, Shuichi Mori
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Abstract
AN on-board vehicle automatic sound volume adjusting apparatus which adjusts the level of an input audio signal in accordance with the difference between the input audio signal level and the running noise level inside the vehicle and which compresses the input audio signal in terms of amplitude according to the level difference. The apparatus inhibits the masking of the minimum component in the reproduced sound volume, and prevents the maximum component therein from becoming excessive when the running noise level is raised.
Claims5
An on-board vehicle automatic sound volume adjusting apparatus for receiving an audio signal and automatically adjusting the level of said audio signal in accordance with a running noise level detected inside said vehicle, said apparatus comprising:
- control means for generating a control signal in response to a difference value between an audio signal level derived from an audio input and said running noise level;
- and
- compressing means provided in an input/output line of said audio signal for detecting an absolute value of said audio signal level and for compressing the amplitude of said audio signal at a degree corresponding to said control signal and said absolute value.
Dependencies are inferred from the claim text.