Audio signal expander apparatus
US5159636A · kind A · utility
8Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 13, 1992 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | Mar 13, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G7/002
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An audio signal expander apparatus for integration into a satellite receiver for recovering audio signal transmissions carried by satellite services utilizing compressed audio signal transmission processing wherein the incoming audio signal is expanded by a ratio which varies with both the audio signal amplitude and audio signal frequency. The audio signal passes first through a low-pass filter and then through a frequency selective negative feedback circuit the output of which is filtered and de-emphasized. In addition, the level of the output audio signal may be varied by a level control adjustment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.