Noise Weighting in the Design of \Delta\Sigma Modulators (With a Psychoacoustic Coder as an Example)

A design flow for ΔΣ modulators is illustrated, allowing quantization noise to be shaped according to an arbitrary weighting profile. Based on finite-impulse-response noise transfer functions, possibly with high order, the flow is best suited for digital architectures. This work builds on a recent p...

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Published inIEEE transactions on circuits and systems. II, Express briefs Vol. 60; no. 11; pp. 756 - 760
Main Authors Callegari, Sergio, Bizzarri, Federico
Format Journal Article
LanguageEnglish
Published IEEE 01.11.2013
Subjects
Delta-sigma modulation
Finite impulse response filters
Frequency modulation
Noise
noise shaping
Optimization
Psychoacoustic models
psychoacoustics
Quantization (signal)
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Abstract A design flow for ΔΣ modulators is illustrated, allowing quantization noise to be shaped according to an arbitrary weighting profile. Based on finite-impulse-response noise transfer functions, possibly with high order, the flow is best suited for digital architectures. This work builds on a recent proposal in which the modulator is matched to the reconstruction filter, showing that this type of optimization can benefit a wide range of applications in which noise (including in-band noise) is known to have a different impact at different frequencies. The designs of a multiband modulator, a modulator avoiding dc noise, and an audio modulator capable of distributing quantization artifacts according to a psychoacoustic model are discussed as examples. A software toolbox is provided as a general design aid and to replicate the proposed results.
AbstractList A design flow for ΔΣ modulators is illustrated, allowing quantization noise to be shaped according to an arbitrary weighting profile. Based on finite-impulse-response noise transfer functions, possibly with high order, the flow is best suited for digital architectures. This work builds on a recent proposal in which the modulator is matched to the reconstruction filter, showing that this type of optimization can benefit a wide range of applications in which noise (including in-band noise) is known to have a different impact at different frequencies. The designs of a multiband modulator, a modulator avoiding dc noise, and an audio modulator capable of distributing quantization artifacts according to a psychoacoustic model are discussed as examples. A software toolbox is provided as a general design aid and to replicate the proposed results.
Author Bizzarri, Federico
Callegari, Sergio
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SubjectTerms Delta-sigma modulation
Finite impulse response filters
Frequency modulation
Noise
noise shaping
Optimization
Psychoacoustic models
psychoacoustics
Quantization (signal)
Title Noise Weighting in the Design of \Delta\Sigma Modulators (With a Psychoacoustic Coder as an Example)
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