H - Electricity – 03 – M
Patent
H - Electricity
03
M
352/17, 354/70,
H03M 1/08 (2006.01) H03G 9/02 (2006.01) H03M 1/02 (2006.01) H03M 1/18 (2006.01) H03M 1/70 (2006.01) H04B 14/04 (2006.01)
Patent
CA 1218157
ABSTRACT An analog to digital conversion system using an analog to digital converter (ADC) and a digital to analog converter (DAC) is described. A fre- quency dependent variable response network, with or without associated gain, is provided in combination with the ADC and DAC. The frequency dependent variable response network changes the shape of its response characteristic in response to a control signal. The invention may be viewed as an adaptive pre- and de- emphasis in combination with the ADC and DAC, whereby the most audible noise is reduced by the response shaping network whenever input signal amplitudes do not lead to system overload, but when overload would occur, the networks adapt to avoid boosting predominant spectral components while retaining noise reduction where noise might be audible in the presence of those spectral com- ponents. Such a system permits much more boost and cut in the presence of predominant signals at frequencies where noise is not a problem, and can therefore render noise modulation inaudible.
427428
Dolby Laboratories Licensing Corporation
Fetherstonhaugh & Co.
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