High efficiency audio encoding method and apparatus
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United States of America Patent
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Nov 3, 1998
Grant Date -
N/A
app pub date -
Dec 7, 1995
filing date -
Dec 15, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for high efficiency encoding of digital data whereby input digital data may be encoded by so-called high efficiency encoding. The high efficiency device includes a signal component encoding circuit including in turn a bandwidth storage circuit 62 for holding the information on the playback band of a previous block, that is the information on the bandwidth of bit allocation performed in the previous block, or the value of the number of the playback encoding units, and a control circuit 63 for deciding the number of playback encoding units of the current block based upon the playback band information, that is the value of the number of the playback encoding units, in the previous block, held by the bandwidth storage circuit 62. Since the stable playback bandwidth is maintained, and there is no risk of the playback band being frequently changed from one block to another, the harsh sounding noise otherwise produced by the appearance and disappearance of high-range side signals is not produced, so that deterioration in the perceived sound quality may be suppressed to a minimum with an insufficient bit rate.
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