Method and apparatus for information encoding and decoding
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United States of America Patent
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Dec 3, 1996
Grant Date -
N/A
app pub date -
May 25, 1994
filing date -
May 25, 1993
priority date (Note) -
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Abstract
Pre-echo in the encoding and encoding of digital audio signals is diminished by utilizing a frequency dividing circuit for dividing the input audio signals into plural bands, normalization circuits for normalizing the frequency components for each frequency band and quantization circuits for an quantizing output of the normalization circuits. The frequency dividing circuit includes a unit for detecting a position in the signal waveform in which the quantization noise not masked by the signal components, that is the pre-echo, is estimated to be generated for producing the signal suppressing information. This signal suppressing information is also quantized as is the quantized output.
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