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US 6,029,126 AGranted
Scalable audio coder and decoder
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.
A coder stored on computer readable memory of a computer system for coding an input signal, the coder comprising a multi-resolution transform processor for receiving the input signal and producing a nonuniform modulated lapped biorthogonal transform having transform coefficients and a weighting processor with a masking threshold spectrum processor for masking quantization noise by spectrally weighting and partially whitening the transform coefficients.
A decoder stored on computer readable memory of a computer system for decoding an encoded input signal having a nonuniform modulated lapped biorthogonal transform with transform coefficients, the decoder comprising an inverse weighting processor with an inverse masking threshold spectrum processor adapted to receive the encoded signal for demasking quantization noise and an inverse multi-resolution transform processor for receiving a demasked encoded signal and the nonuniform modulated lapped biorthogonal transform of the encoded signal to produce an output signal as a perceptually transparent reproduction of the input signal.
A computer implemented method for encoding an input signal comprising:
A computer implemented method for encoding an input signal comprising:
A computer implemented method for encoding an input signal comprising:
Dependencies are inferred from the claim text.