System and method for stereo digital audio compression with co-c

Details System and method for stereo digital audio compression with co-c System and method for stereo digital audio compression with co-c

1992-06-08

1994-01-11

Ng, Jin F.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Pseudo stereophonic

381 22, 381 23, 381 18, 381 1, H04S 500

Patent

active

052789098

ABSTRACT:
Left right and surround components of a stereo signal are coded into a monaural and small co-channel providing volume steering for recreating a stereo effect with a substantially reduced bit rate. The signal is split into a sum and difference signal, the difference signal is randomized and the sum is added to the randomized difference to comprise the single audio channel. A functional relationship is solved for left and right volumes which is then transmitted for intervals on the co-channel. Decoding of the single transmission channel directs it to left, right, or surround channels based on decoding on the logic co-channel. The co-channel updates left and right volume levels which are interpolated through time to effect smooth volume change. Surround gain is determined from left and right channel gains to maintain unity total volume, with the sum of the squares of the three volume controls being unity.

REFERENCES:
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patent: 4680796 (1987-07-01), Blackmer et al.
patent: 4769841 (1988-09-01), Cugnini
patent: 4815132 (1989-03-01), Minami
patent: 4825305 (1989-04-01), Itoh et al.

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