Some more information I found concerning Sigma delta modulation:
"When sigma delta modulation is used for audio signal processing, limit cycles in the output may result in idle tones that are audible to the listener. We show that a multibit implementation of a modified first order sigmadelta modulator may produce an effective, stable chaotic modulator that accurately encodes the input and prevents idle tones."
Full article here:
http://www.elec.qmul.ac.uk/people/j...-Multibitchaoticsigmadeltamodulation.pdf I think the difference between 1 bit or multi-bit sigma-delta is explained by this paragraph:
"A multibit implementation may offer increased resolution in the quantization. For an n bit first order modulator, the quantized output can assume one of m=2n states."
P.S. sorry if I forgot to thank you Mark.
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