Method and apparatus for controlling an audio signal level
US6693491B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 2001 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Aug 14, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G1/0088
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A control circuit for controlling a level of an audio signal and transmitting the signal to an amplifier is described. The control circuit is based on an R-2R resistor network having a first plurality of resistor nodes and a parallel resistor network having a second plurality of resistor nodes. Each of the resistors in the parallel network has a value equal to one-half of the value of the preceding resistor. A plurality of switches alternately connects each of the plurality of resistor nodes to one of a plurality of low impedance nodes and a low impedance input node associated with the amplifier. Switch control circuitry selectively controls the plurality of switches to transmit the audio signal to the low impedance input node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.