Audio compression circuit and method
US6405164B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1999 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Dec 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/356
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An audio compressor utilizes a switched charging state rectifier which produces an output proportional to the magnitude of an input signal but with controlled attack/release times. The rectified voltage is input to a logical selector, which provides logical control signals which are a function of the rectified voltage. In a preferred embodiment, the control signals of the logical selector are used to select the switch positions of a switched resistor ladder. The switched resistor ladder is used to provide a resistance path in an op-amp feedback amplifier, thereby enabling the gain of the op-amp amplifier to be adjusted in steps by the selector as the rectified signal level varies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.