FIELD: radio engineering; initial coding systems.
SUBSTANCE: band width is reduced in front of coder or within coder followed by duplicating spectrum band in decoder. This is made by using new methods of transposition jointly with spectrum envelope. Proposed invention can be implemented in hardware or software codec, or can be used as self-contained processor in combination with codec. Improvement is ensured irrespective of type of codec and state-of-the-art.
EFFECT: reduced bit transfer speed at desired perception quality or enhanced perception quality at desired bit transfer speed.
20 cl, 34 dwg
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