Apparatus for encoding digital data with reduction of perceptibl

Details Apparatus for encoding digital data with reduction of perceptibl Apparatus for encoding digital data with reduction of perceptibl

1993-03-12

1996-03-26

MacDonald, Allen R.

395 236, G10L 900

Patent

active

055027890

ABSTRACT:
Apparatus for efficiently encoding a digital signal divides the digital signal into a number of signals within respective predetermined frequency bands which are segmented into blocks which, in turn, are orthogonally transformed so as to form coefficient data. The coefficient data is then quantized. A detection circuit detects whether at least the divided signal within the lowest frequency band contains a transient. If a transient is detected, a control circuit controls the encoding processing of a least the divided signal within the lowest frequency band by, for example, increasing the number of bits used for quantizing, reducing the block size, and/or reducing the signal level so as to reduce the perceptibility of noise in the processed signal.

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