System and method for spectral shaping of dither signals

Details System and method for spectral shaping of dither signals System and method for spectral shaping of dither signals

2006-03-07

2006-03-07

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

Reexamination Certificate

active

07009542

ABSTRACT:
An improved dither generation circuit and method for digital audio circuits uses a high-pass filter to reduce the energy contained in the audio band of the dither signal. The resulting dither signal is applied to the circuit in its main feedback loop and is effective to prevent idle tones. Because of its spectrally shaped characteristic this dither signal introduces less noise into the audio band of interest and thereby improves the overall signal-to-noise ratio of the audio circuit. In an embodiment, the dither signal is generated using pseudo-random numbers that are then interpreted as 2's complement numbers.

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