DPCM system with rate-of-fill control of buffer occupancy
Code converting system and method for band compression of digital signals
Method for data reduction of digital video signals by vector quantization of coefficients acquired by orthonormal transformation with a symmetrical nearly, cyclical hadamard matrix
Method and coding and decoding devices for picture transmission through a variable rate network
Adaptive buffer/quantizer control for transform video coders
Orthogonal transform coding apparatus for reducing the amount of coded signals to be processed and transmitted Patent #: 5073821
ApplicationNo. 704551 filed on 05/23/1991
US Classes:375/240.05, Feed back375/243, Correcting or reducing quantizing errors375/246Length coding
ExaminersPrimary: Groody, James J.
Assistant: Lee, Michael G.
Attorney, Agent or Firm
International ClassesH04N 007/12
AbstractThe problems of buffer overflow and underflow encountered when employing actually variable or effectively variable bit-rate channels for communicating encoded video images are overcome by jointly controlling the number of bits employed to encode each video frame and the transmission bit-rate of the variable bit-rate channel as experience by the encoder. The selection of the number of bits employed to encode each video frame, and hence the encoder bit-rate, as well as the associated channel bit-rate are determined from the encoder buffer fullness, a determination of the decoder buffer fullness and any constraint imposed on the channel. The encoder is responsive to the selected encoder bit-rate and accordingly adjusts its encoding parameters so as to achieve the selected encoder bit-rate.