Digital clip and gain circuit
US4771192A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1986 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Nov 14, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.