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US 5,204,677 AGranted
Quantizing error reducer for audio signal
AssigneeSony Corporation
InventorsKenzo Akagiri, Makoto Akune
Life of this patent
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Abstract
There is provided a quantizing error reducer for an audio signal, which is constructed to feed a quantizing error back to the input side of a quantizer through a noise filter, wherein the coefficient of the noise filter is set on the basis of information relating to the equiloudness curve, thereby making it possible to reduce the noise in the hearing sense.
Claims5
A quantizing noise reducer for an audio signal comprising:
- quantizing means for quantizing an input audio signal,
- subtracter means for subtracting an input signal to said quantizing means from an output signal from said quantizing means,
- filter means supplied with an output from said subtractor means,
- means for synthesizing an output from said filter means and said input audio signal, and
- filter control means for controlling a characteristic of said filter means, and including filter coefficient calculating means and data generating means for generating data relating to an equi-loudness characteristic, said data being supplied to said filter coefficient calculating means.
2 more elements
Dependencies are inferred from the claim text.