Audio signal reproduction apparatus

Details Audio signal reproduction apparatus Audio signal reproduction apparatus

1997-09-19

1998-07-21

Kuntz, Curtis

Electrical audio signal processing systems and devices

Including amplitude or volume control

Automatic

381104, 381106, H03G 300

Patent

active

057844763

ABSTRACT:
Audio signal reproduction apparatus, for example, an in-car entertainment system, includes a number of audio signal sources (I--I to I-N) which are selected by means of a selector (2) and fed to an AGC circuit (4) before being applied to an amplifier (6) and loudspeaker (7). The AGC circuit (4) includes an amplitude analyzer (42) and a low-pass filter (43) to produce an output signal (44) which controls the gain of an amplifier (41). The arrangement is such that the AGC circuit only causes a gain change when the audio signal lies outside a predetermined amplitude band for a given minimum time period. Thus only long "too loud" or "too soft" passages cause a gain change and transients pass through the arrangement without causing a gain change.

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