Electrical audio signal processing systems and devices – Monitoring of sound – Amplification control responsive to ambient sound
Patent
1994-08-10
1996-08-27
Brinich, Stephen
Electrical audio signal processing systems and devices
Monitoring of sound
Amplification control responsive to ambient sound
381104, H03G 320
Patent
active
055509223
ABSTRACT:
The invention relates generally to a method for adjusting the volume of a vehicle radio to the surrounding noise level, where the audio signal level, sampled downstream of a setting element (2), placed in the path of the audio signal, and a driving noise signal level (FG) are supplied to a control loop (1, 2, V1) that attempts to minimize the difference between the audio signal level and the driving noise signal level. To prevent the signal level from running up during a signal pause and a driving noise level at hand, an audio signal pause recognition is provided which identifies low-signal audio passages as pauses, using a variable threshold, and slowly lowers the audio signal level during these pauses.
REFERENCES:
patent: 4479237 (1984-10-01), Sugasawa
patent: 4628526 (1986-12-01), Germer
patent: 5054078 (1991-10-01), Schorman et al.
patent: 5081682 (1992-01-01), Kato et al.
patent: 5243657 (1993-09-01), Cotton
IEEE Transactions on Consumer Electronics, vol. CE-27, No. 3, Aug. 1981, New York, pp. 227-223, T. Taniyama "Automatic loudness adjusting circuits for automotive audio systems."5
Frishauf, Holtz, Goodman, Langer & Chick, P.C.
Blaupunkt-Werke GmbH
Brinich Stephen
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