FMX stereophonic broadcast receiver
US4864637A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | May 16, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/1692
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An improved FMX sterophonic broadcast receiver provided with countermeasures against transient noises, which includes a level detection circuit for detecting level of a detected stereo difference signal, and a level control circuit for controlling level of an expanded stereo difference signal according to an output signal of the level detection circuit. By the above arrangement of the present invention, since it is so arranged to cause the level control circuit to function when the degree of modulation becomes large so as to control the level of the stereo difference signal to be low, a level difference is produced between the stereo sum signal and the stereo difference signal for deterioration of the stereo separation degree upon matrixing at a matrix circuit for reduction of noises accordingly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.