FM stereo receiving device

Details FM stereo receiving device FM stereo receiving device

1991-09-27

1993-01-12

Ng, Jin F.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 7, 381 13, H04H 500

Patent

active

051795930

ABSTRACT:
An FM stereo receiving device according to the present invention has an object to be able to demodulate a stereo signal in a state close to a monaural reception, in which a pilot signal is extracted from an FM-demodulated output; a subcarrier signal is formed, based on this pilot signal; IF signals are switched intermittently by this subcarrier signal; and intermittent IF signals are IF-detected to obtain intermittent signals of base-band signals.
These intermittent signals are switched by means of two switches, based on a subcarrier signal. Low frequency components of each output audio signal are extracted to obtain left and right signals EL and ER through a de-emphasis circuit.
Owing to this device, it is possible to enlarge a reception region for an FM stereo broadcast with a high sensitivity.

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