Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1990-08-29
1992-02-25
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
381 13, H04H 500
Patent
active
050919431
ABSTRACT:
In an FM stereo receiving device according to the present invention, a received first FM-modulated wave is demodulated by means of an FM-demodulator, from the demodulated output of which a subcarrier signal is produced, further a monaural signal is extracted by means of an LPF, and the monaural signal is again FM-modulated by means of a voltage controlled oscillator to obtain a second FM-modulated wave. Then a difference frequency component wave is produced by a multiplication operator and an LPF, starting from the first FM-modulated wave and the second FM-modulated wave and the FM-modulated wave and the difference frequency component wave are switched over with the subcarrier signal by means of a switch circuit. In this way signals of a right ear side component and a left ear side component are obtained and a stereo signal is obtained by FM-demodulating both the signals by means of the FM-demodulator. Consequently, by using the present receiving device, it is possible to suppress influences of noise at the demodulation of the FM-modulated wave at the same degree as the monaural signal and to increase the SN ratio at the reception of the stereo signal in weak electric field.
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Chen Sylvia
Clarion Co., Ltd
Isen Forester W.
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