Method and device for inserting data to and extracting data from analog TV baseband signal

Application Number: 00103050
Application Date: 2000.02.24
Publication Number: 1310552
Publication Date: 2001.08.29
Priority Information:
International: H04N7/08
Applicant(s) Name: Beijing Huanuo Information Techn Co., Ltd.
Inventor(s) Name: Zhan Jun;Du Julong
Patent Agency Code: 72003
Patent Agent: chen gong
Abstract Modulated data are inserted into the vertical flyback blanking time interval or trace sych time interval of analog TV baseband signal. When the modulated data are inserted into the trace sych time interval, the data signal has frequency range in the gap between the horizontal sych signal spectrum and the color subcarrier signal spectrum. In the sending end, the signals of clock phase lock circuit and local vibrator phase lock circuit are phase-locked to synchronize with the color subcarrier signal; and in the receiving end, the signals of sampling clock generator and the local vibrator phase locking circuit are made to phase lock synchronize with the color subcarrier signal in color subcarrier phase lock circuit.