Apparatus for receiving and processing frequency modulated elect

Details Apparatus for receiving and processing frequency modulated elect Apparatus for receiving and processing frequency modulated elect

1986-12-01

1993-04-20

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

455278, 455297, H04H 500

Patent

active

052049043

ABSTRACT:
A system for increasing the quality of the sound available from a broadcast, frequency modulated, radio frequency, stereophonic signal. Sound quality is promoted by: (1) so switching between available antennas that the signal available from the antenna receiving the incoming signal which is stronger and contains the least multipath distortion is processed into audio output signals, and (2) at least partially blending stereophonically related audio input signals into a monophonic signal if the modulation of the incoming first and second audio signals decreases below a selected threshold value and if: (a) the multipath distortion in the incoming signal reaches or exceeds a preselected threshold value, or (b) the strength of the incoming signal decreases to, or falls below, an also preselected threshold value.

REFERENCES:
patent: 4063039 (1977-12-01), Endres et al.
patent: 4157455 (1979-06-01), Okatani et al.
patent: 4390749 (1983-06-01), Pearson
patent: 4426727 (1984-01-01), Hamada
patent: 4491957 (1985-01-01), Kamalski
patent: 4499606 (1985-02-01), Rambo
patent: 4566133 (1986-01-01), Rambo
patent: 4574389 (1986-03-01), Schotz
patent: 4578819 (1986-03-01), Shimizu
Duplan Corporation v. Derring Milliken, Inc., et al, 197 USPQ at 444.

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