Electrical audio signal processing systems and devices – Monitoring of sound – Amplification control responsive to ambient sound
Patent
1985-01-04
1987-02-03
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
Monitoring of sound
Amplification control responsive to ambient sound
381 86, 455234, H03G 320
Patent
active
046413448
ABSTRACT:
Audio equipment designed for use at widely varying ambient noise levels allows an audio signal to be amplified to enhanced levels under noisy conditions without added distortion near the high-amplitude end of its dynamic range. Detected or anticipated ambient noise conditions trigger a dynamic range controller to boost the gain of the audio signal to an extent inversely related to the audio signal amplitude. Thus, low-volume audio will be boosted to a great extent while the high-volume end of the dynamic range will experience little or no additional gain. The net effect is two allowable dynamic ranges, both sharing the same high-end volume level but with possibly widely different low-end volume levels. This gain and dynamic range control may also be performed independently on a number of discrete frequency bands. In addition, noise components inherent to the audio signal may be filtered to ambient noise-dependent extends, or the gain boost may be inhibited at volume levels susceptible to such noise.
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Nissan Service Weekly Report (Nissan Service Syuho in Japanese), vol. No. 428, (LP-1) pp. 270, 271, Sep., 1980.
Imai Hiroshi
Kasai Junichi
Nissan Motor Company Limited
Rubinson Gene Z.
Schroeder L. C.
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