Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1996-08-30
1998-07-21
Chang, Vivian
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
318 11, 318 13, H04H 500
Patent
active
057844658
ABSTRACT:
The invention is directed to reducing noises of a low density without causing the listener to feel a sense of incongruity. A received signal is subjected to frequency discrimination. The sound signals of the right-channel and the left-channel are separated on the basis of a channel separation, and then are output as sounds. When noises are not generated, the channel separation is controlled in accordance with a control voltage corresponding to the electric field strength of the received signal which is output from an S-meter circuit via a channel separation controlling circuits. When noise signal in the received signal are extracted by a multipath detector, the first and the second integration circuits integrate the noise signal. When the noise density is so low that only the first integration circuit reaches the on-voltage, the channel separation is lowered to about 10 dB in accordance with the control voltage corresponding to the noise density of the channel separation controlling circuit. When the noise density is so high that both the first and the second integration circuit reach the on-voltage, the channel separation is lowered to about 4 dB or less in accordance with the control voltage corresponding to the noise density of the channel separation controlling circuit.
REFERENCES:
patent: 5432854 (1995-07-01), Honjo et al.
patent: 5455866 (1995-10-01), Ohashi
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