Digital signal transmitting and/or receiving system
TDMA communications system with adaptive equalization
Digital carrier combining apparatus in a multiple QAM digital television signal receiver
Method and apparatus for communicating digital information such as compressed video using treillis coded QAM Patent #: 5321725
ApplicationNo. 110906 filed on 08/24/1993
US Classes:370/207, Having a signaling constellation329/304, PHASE SHIFT KEYING OR QUADRATURE AMPLITUDE DEMODULATOR332/103, PHASE SHIFT KEYING MODULATOR OR QUADRATURE AMPLITUDE MODULATOR348/384.1, BANDWIDTH REDUCTION SYSTEM370/477, Transmission bandwidth conservation375/240, BANDWIDTH REDUCTION OR EXPANSION375/257, CABLE SYSTEMS AND COMPONENTS375/261, Quadrature amplitude modulation714/755, Double encoding codes (e.g., product, concatenated)725/144, Headend725/151Receiver (e.g., set-top box)
ExaminersPrimary: Olms, Douglas W.
Assistant: Blum, Russell W.
Attorney, Agent or Firm
International ClassH04J 011/00
AbstractA cost-effective, bandwidth-efficient, and power-efficient system is provided in which data streams received from several different video sources are converted into sequences of symbols selected from a predetermined constellation and are multiplexed on a symbol-by-symbol basis into a single sequence of symbols for transmission on a channel. Using a symbol multiplexer helps to mitigate the effect of bursty noise in the receiver and reduces the processing speed requirement in the receiver.