Patent · US Expired

Method and apparatus for using a vertical internal test signal for phase control of an offset modulation of offset sampling system

US4661839A · kind A · utility

5Cited by

7References

8Claims

0Family size

Assignee

Ant Nachrichtentechnik GmbH · DE

Inventors

Martin Plantholt · Hemmingen, DE
Berthold Eiberger · Darmstadt, DE
Hartmut Schroder · Birkenfeld, DE

Key dates

Filing date	Apr 12, 1985
Grant date	Apr 28, 1987
Priority date	—
Expiry date	Apr 12, 2005

Classification

Technology area (CPC H)Electricity
CPC primaryH04N11/08
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

In the transmission of a color television signal containing chrominance burst and sync signals over a Nyquist channel between a transmitting station and a receiving station, a method for modulating and synchronously demodulating the television signal according to the offset modulation and offset sampling principle. The chrominance burst or sync pulses are used as a reference signal for frequency recovery at the receiving station. An additional reference signal is generated at the transmitting station and transmitted over the Nyquist channel. The additional reference signal is utilized for phase recovery at the receiving station.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.