The USQ family of multichannel sound reproduction systems has undergone several noteworthy refinements in recent years. Advances in encoding techniques and the commercial availability of the Tate Directional Enhancement System provide for fully compatible 2-channel storage, transmission and reproduction of surround programs while allowing the possibility of using 3- and 4-channel USQ systems for reproduction of height effects. A system for improved FM and television transmission of stereo and multichannel programs will be discussed. Performance criteria and design of commercially available encoders and decoders using current state of the art circuitry will also be presented.
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