Dolby's solution to the center-channel problem was to use a " directionally enhanced " matrix decoder, based on those developed for domestic " Quadraphonic " systems, to recover a center channel from left and right channels recorded on the film.
12.
In 1973 Sansui introduced the " QS Vario Matrix decoder " with 20 dB separation in all directions . ( The " Vario Matrix decoder " could also play SQ records on " Phase Matrix " mode with 6 dB separation.
13.
In 1973 Sansui introduced the " QS Vario Matrix decoder " with 20 dB separation in all directions . ( The " Vario Matrix decoder " could also play SQ records on " Phase Matrix " mode with 6 dB separation.
14.
It was to be played back using the now long-extinct Dynaco or EV Stereo-4 decoders, or later, using the " 360Surround " matrix decoder built by Stephen Desper and previously included with purchases of his limited-edition book " Recording the Beach Boys ".
15.
A typical early example is the SSM-2125 from PMI . The SSM-2125 is a complete Dolby Stereo matrix decoder ( except for the surround delay ) on a single chip, it allowed domestic decoders which used the same logic system found in professional decoders to be marketed to the consumer.
