Multipath noise minimizer for radio receiver

Details Multipath noise minimizer for radio receiver Multipath noise minimizer for radio receiver

1992-04-06

1993-09-28

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

455 65, 455296, 455311, 455316, 455318, H04H 500

Patent

active

052492338

ABSTRACT:
A frequency modulation (FM) stereo broadcast receiver detects the onset of multipath interference and initiates corrective action to minimize the audible effects of multipath. Under an unacceptable multipath interference condition, a multipath detection signal disables the FM RF mixer thereby preventing any further energy in the multipath event from entering succeeding sections of the receiver. This action reduces noise generated by multipath interference and allows the output to return to normal in a shorter time. In another aspect of the invention, a phase-locked loop employed in a stereo decoder circuit is latched during the multipath disturbance in order to avoid rapid changes in the phase of the regenerated pilot employed in the stereo decoder.

REFERENCES:
patent: 3537008 (1970-10-01), Lakatos
patent: 4521918 (1985-06-01), Challen
patent: 4590615 (1986-05-01), Ohtaki et al.
patent: 4694500 (1987-09-01), Tazaki et al.
patent: 4878252 (1989-10-01), Sessink
patent: 4881274 (1989-11-01), Tazaki et al.
patent: 4910799 (1990-03-01), Takayama
patent: 5202924 (1993-04-01), Richards, Jr.

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