TV Sound transmission system
US4405944A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1982 |
| Grant date | Sep 20, 1983 |
| Priority date | — |
| Expiry date | Mar 12, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/607
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A television signal audio transmission system comprises transmission means for developing first and second stereophonically related audio signals and means for developing a third audio signal. The transmission means further includes circuitry for developing a composite baseband signal having a first component comprising the sum of the first and second audio signals, a second component comprising a double sideband suppressed carrier signal formed by amplitude modulating a 2f.sub.H subcarrier with the difference between the first and second audio signals, a third component comprising a pilot signal having a frequency f.sub.H and a fourth component comprising a 4f.sub.H subcarrier signal frequency modulated according to the third audio signal, where f.sub.H represents the horizontal scanning line frequency. The composite baseband signal may include a fifth component comprising an approximately 5.5f.sub.H subcarrier signal frequency modulated in accordance with a first information signal and a sixth component comprising an approximately 6.5f.sub.H subcarrier signal frequency modulated in accordance with a second information signal. In an alternate embodiment, the fourth and fifth compo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.