Technique for generating semi-compatible high definition television signals for transmission over two cable TV channels
An HDTV compression system
Method and apparatus for the transmission and reception of a multicarrier digital television signal
Apparatus providing a clock signal for a digital television receiver in response to a channel change
Encoding and transmission method with at least two levels of quality of digital pictures belonging to a sequence of pictures, and corresponding devices
Automatic gain control system for a high definition television signal receiver
Apparatus for time division multiplexed processing of plural QAM signals
Apparatus for time division multiplexed processing of frequency division multiplexed signals
Automatic gain control system for a high definition television signal receiver including an adaptive equalizer Patent #: 5268761
ApplicationNo. 209357 filed on 03/14/1994
US Classes:348/472, Pulse code modulation348/470, Adapted to reduce noise or for frequency modulation (e.g., variable gain)375/240.25, Specific decompression process375/342Locating predetermined portion of pulse
ExaminersPrimary: Groody, James J.
Assistant: Metjahic, Safet
Attorney, Agent or Firm
International ClassesH04N 007/00
AbstractIn a video signal processing system, a single adaptive passband equalizer is used to process a composite Quadrature Amplitude Modulated (QAM) signal encoded with high priority (HP) and standard priority (SP) components. The equalizer output is phase corrected by a de-rotator, and filtered to separate the HP and SP components. Error signals respectively representing HP and SP phase errors are developed. One of the error signals controls the operation of the de-rotator. Both error signals are used to generate updated coefficients for the adaptive equalizer. Afterwards the HP and SP components are decoded and combined.