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Methods and apparatus for whitening quantization noise in a delta-sigma modulator using dither signal
Methods and apparatus for whitening quantization noise in a delta-sigma modulator using dither signal
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机译:使用抖动信号在delta-sigma调制器中白化量化噪声的方法和设备
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摘要
Methods and apparatus are provided for whitening quantization noise in a delta-sigma modulator using a dither signal. An input signal is quantized using a predictive delta-sigma modulator by quantizing the input signal using a quantizer; adding a dither signal at a first location of the predictive delta-sigma modulator; determining a quantization error associated with the quantizer; removing the dither signal at a second location of the predictive delta-sigma modulator (for example, by subtracting a substantially similar version of the dither signal at the second location); generating an error prediction value using an error predictive filter; and subtracting the error prediction value from the input signal. The dither signal may be a white noise signal and may optionally be generated using a pseudo-random number generator.
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