Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1990-03-21
1992-09-29
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
H04H 500
Patent
active
051519399
ABSTRACT:
An adaptive audio processor for stereo AM broadcast signals includes independent signal processing paths. Each path has a variable lowpass filter and a matrix and variable Q 10 kHz notch filter to form LEFT and RIGHT channel signals with a 10 kHz notched pass band determined by adjacent channel noise. A 10 kHz pass band signal representative of adjacent channel noise from one of the signal processing paths is compared to a reference to generate a correction signal that is fedback to control the lowpass and notch filters. The correction signal adjusts the pass band and Q of the lowpass and notch filters so that the effects of adjacent channel noise are minimized. Other receiver signals which are reflective of the quality of the received broadcast signal, e.g., the AGC signal, an excess modulation signal, and a receiver microprocessor signal are similarly employed to control the lowpass and notch filters.
REFERENCES:
patent: 4206317 (1980-06-01), Kahn
patent: 4680795 (1987-07-01), Ecklund
patent: 4866779 (1989-09-01), Kennedy et al.
Kady Mark A.
Kennedy Richard A.
Manlove Gregory J.
Marrah Jeffrey J.
Delco Electronics Corporation
Duke Albert F.
Isen Forester W.
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