Digital clip and gain circuit

Details Digital clip and gain circuit Digital clip and gain circuit

H - Electricity

04

N

350/53

H04N 5/20 (2006.01) H04N 5/265 (2006.01)

Patent

CA 1264491

- 13 - Abstract of the Disclosure A digital clip and gain circuit compares an input waveform with a clip level to produce a difference waveform. The difference waveform is shifted by an exponent representing a power of two portion of a gain value, and is then multiplied by a mantissa representing a fractional portion of the gain value. The resulting product is input to a lookup table which provides level shifting and limiting to output a control waveform. A parallel overflow logic circuit processes the difference waveform and the exponent portion of the gain value to determine if the resulting product is out of range. If the resulting product is out of range, the lookup table outputs either a maximum or a minimum value for the control waveform according to the sign of the difference waveform.

551629

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