Digital signal gain control circuitry for varying digital signals in substantially equal db steps
US4731851A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 24, 1986 |
| Grant date | Mar 15, 1988 |
| Priority date | — |
| Expiry date | Sep 24, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/002
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A volume control or amplitude varying system for digital signals includes a cascade connection of a coarse multiplier/divider for changing the values of digital signals in 6 db steps and a fine multiplier/divider for changing the values of digital values logarithmically in substantially equal steps of less than 6 db per step. The coarse multiplier/divider selectively multiplies the digital signal by powers of 2. The fine multiplier/divider multiplies the digital signal by predetermined values, an ascending/descending sequence of which form a substantially logarithmic sequence. Both serial-bit and parallel-bit embodiments are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.