Automatic process of adjustment of the volume of sound reproduct

Details Automatic process of adjustment of the volume of sound reproduct Automatic process of adjustment of the volume of sound reproduct

1994-06-24

1996-06-25

Rogers, Scott A.

Electrical audio signal processing systems and devices

Monitoring of sound

Amplification control responsive to ambient sound

381107, 381108, H03G 300, H03G 324

Patent

active

055307612

ABSTRACT:
A control process and apparatus which automatically ensures adjustment of the volume of sound delivered by a sound reproduction source, such as a car radio, as a function of the ambient sound signals so that the user has the sensation of listening to an audio program which is maintained at the same sound level regardless of variations in disturbing noise level. The apparatus uses a microphone which picks up the ambient sound signals and employs computer circuitry operating under program control for determining the average level of the ambient sound signals; circuits are used which supply signals to the computer representing the level of the sound delivered by the sound reproduction source; under program control the computer determines the difference in level between the ambient sound signal and the delivered sound signal to obtain a result (S.sub.OM) representing the value of the user's listening comfort. This value (S.sub.OM) is subtracted from subsequent measurements of the difference between the value of the ambient sound signal and that of the delivered sound signal. This provides the sign and the magnitude of any difference (S) which is then compared with value regions quantifying this difference (S). As a function of a coefficient of membership in each of the value regions, the control process determines, with the aid of possible regions of adjustment, the value of an adjustment factor to be applied to adjust the volume of sound delivered by the sound source.

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