Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1994-08-10
1996-07-09
Brinich, Stephen
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
381 94, H04H 500
Patent
active
055352804
ABSTRACT:
In a digital circuit which removes ignition noise from a multiplex signal in a radio receiver, especially in a car radio, the multiplex signal is supplied via a high-pass filter (3) and a squaring or absolute value determing circuit (4) as a digital signal with a sampling frequency that is a multiple of the frequency of the pilot tone. The high-pass filtered and squared or absolute value multiplex signal is compared to a short-time mean value of the high-pass filtered and squared (in absolute value) multiplex signal. A control signal S of predetermined duration is formed when deviations occur that are greater than a preset standard. The control signal S controls a correcting circuit in such a manner that sampling values of the multiplex signal occurring during the control signal are replaced with sampling values occurring during the previous period of the pilot tone, thereby masking the ignition noise.
REFERENCES:
patent: 4426727 (1984-01-01), Hamada
patent: 4574390 (1986-03-01), Hirobashi et al.
patent: 4769840 (1988-09-01), Saisho
patent: 4982431 (1991-01-01), Tanno
Chahabadi Djahanyar
Vogt Lothar
Blaupunkt-Werke GmbH
Brinich Stephen
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