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US 6,240,380 B1Granted
System and method for partially whitening and quantizing weighting functions of audio signals
AssigneeMicrosoft Corporation
InventorHenrique S. Malvar
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AssigneeMicrosoft Corporation
InventorHenrique S. Malvar
Estimating the term…
The coder/decoder (codec) system of the present invention includes a coder and a decoder. The coder includes a multi-resolution transform processor, such as a modulated lapped transform (MLT) transform processor, a weighting processor, a uniform quantizer, a masking threshold spectrum processor, an entropy encoder, and a communication device, such as a multiplexor (MUX) for multiplexing (combining) signals received from the above components for transmission over a single medium. The decoder comprises inverse components of the encoder, such as an inverse multi-resolution transform processor, an inverse weighting processor, an inverse uniform quantizer, an inverse masking threshold spectrum processor, an inverse entropy encoder, and an inverse MUX. With these components, the present invention is capable of performing resolution switching, spectral weighting, digital encoding, and parametric modeling.
In a system for encoding an audio signal, the system having frequency-domain transform coefficients of the audio signal and modified with plural weighting functions, a method for partially whitening the weighting functions, comprising:
A noise whitening system for masking quantization noise during encoding of an audio signal, the noise whitening system having frequency-domain transform coefficients obtained from the audio signal and modified with plural weighting functions and comprising a flatten processor for flattening each weighting function to produce final weights in order to attenuate noise spectral peaks and a mask processor that applies the final weights to the audio signal as a function for masking quantization noise.
In a system for encoding an input signal, the system having frequency domain transform coefficients of the input signal, and wherein the coefficients are modified with spectral weighting functions to mask quantization noise, a method for partially whitening the weighting functions, comprising:
Dependencies are inferred from the claim text.