Differentially convolutional channel coding with expanded set of signalling alphabets
Source coded modulation system
QANI Trellis-coded signal structure
Digital signal coding
Technique for designing a multidimensional signaling scheme
High efficiency, small volume evaporator for a refrigerant Patent #: 5901782
ApplicationNo. 908407 filed on 07/10/1992
US Classes:375/265, Trellis encoder or Trellis decoder348/155, Motion detection375/240.23, Variable length coding375/339, Carrier controlling local generator714/756, Cross-interleave Reed-Solomon code (CIRC)714/784, Reed-Solomon code714/792Trellis code
ExaminersPrimary: Chin, Stephen
Assistant: Phan, Hien H.
Attorney, Agent or Firm
International ClassH04L 005/12
AbstractA method and apparatus for communicating high definition television signals is provided. Video signals are divided into blocks of PCM data. The PCM data is processed using motion estimation and compensation to provide DPCM data. For each block, one of PCM and DPCM data is selected for transmission based on a predetermined criteria. The selected data is compressed using the discrete cosine transform to provide blocks of transform coefficients. The coefficients are quantized to improve their coding efficiency and variable length coded. The variable length coded coefficients are coded using a concatenated coding scheme with a Reed-Solomon outer code and trellis inner code to provide coded signals for transmission. The coded signals are transmitted using QAM.