Independent channel modulation system for AM stereo
US4638504A · kind A · utility
5Cited by
15References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1985 |
| Grant date | Jan 20, 1987 |
| Priority date | — |
| Expiry date | Jun 28, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H20/49
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus for modulating signals for use in AM stereo transmission having left and right signal inputs feeding respective inverted and non-inverted inphase modulators and respective inverted and non-inverted quadrature modulators. The inverted and non-inverted inphase outputs are summed, the inverted and non-inverted quadrature outputs are summed, and the resulting inphase and quadrature signals are summed. The resulting signal is fed to a limiter and then to a broadcast transmitter, such as a difference transmitter, as a radio frequency input.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.