Digital BTSC compander system
US6037993A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1998 |
| Grant date | Mar 14, 2000 |
| Priority date | — |
| Expiry date | Mar 11, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R5/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for generating a broadcast television stereo signal has a left channel and a right channel. An analog-to-digital converter converts the right-channel signal to a right digital signal and the left-channel to a left digital signal. A circuit, which could include a digital signal processing chip, generates a first signal that includes the right digital signal added to the left digital signal and generates a second signal that includes the right digital signal subtracted from the left digital signal. The circuit also generates a digitally pre-emphasized first signal, which includes digital pre-emphasis, and a digitally pre-emphasized second signal, which also includes digital pre-emphasis. The circuit transforms the pre-emphasized first signal to a digital BTSC L+R signal and transforms the pre-emphasized second signal to a digital BTSC L-R signal. A digital-to-analog converter converts the digital BTSC L+R signal to an analog BTSC L+R signal and the digital BTSC L-R signal to an analog BTSC L-+R signal. The analog BTSC L+R and L-R signals are then modulated onto a carrier wave.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.