摘要:
An interframe coding system for frame-to-frame coding of an input signal (12), having a local decoding loop which includes an encoder (4) for interframe coding the input signal, decoding means (5) for producing a decoded signal (18), and a frame memory (1) which receives the decoded signal and outputs a predicitive signal (14). The system further comprises a controller (21a) for receiving the input signal and the predictive signal from the frame memory, for calculating a difference between the input signal and the predictive signal, for calculating a characteristic of the input signal and for generating a coding control signal (25) based on the difference and the characteristic for controlling the encoder.
摘要:
It is an object of this invention to carry out the error correcting coding for random errors and cell loss effectively and to obtain a transmitter for coding error correction codes and a receiver for decoding error correction code on a transmission frame which minimizes transmission delay. This apparatus comprises following facilities; Data content of N x L symbols is assumed here to be the unit of a transmission frame. A buffer memory which divides N data symbols into p blocks and stores the p data blocks of L cells, a check code generator which carries out the error correcting coding in the unit of p blocks in the orthogonal direction of transmission, a cell composer which selects a specific cell of p blocks N data symbols and generates a transmission cell and a counter which appends an identifier to the top of cells in the transmission direction. The cell with the identifier is transmitted after being replaced with a part of coding cells as requested.
摘要:
It is an object of this invention to carry out the error correcting coding for random errors and cell loss effectively and to obtain a transmitter for coding error correction codes and a receiver for decoding error correction code on a transmission frame which minimizes transmission delay. This apparatus comprises following facilities; Data content of N x L symbols is assumed here to be the unit of a transmission frame. A buffer memory which divides N data symbols into p blocks and stores the p data blocks of L cells, a check code generator which carries out the error correcting coding in the unit of p blocks in the orthogonal direction of transmission, a cell composer which selects a specific cell of p blocks N data symbols and generates a transmission cell and a counter which appends an identifier to the top of cells in the transmission direction. The cell with the identifier is transmitted after being replaced with a part of coding cells as requested.
摘要:
A vector quantizer which transmits the input vector of the time when the minimum distortion is larger than the preset distortion threshold value and stores such input vector into the second code book as the new quantizing representative vector for the use in the successive vector quantizing processes. Further, since the first and second code book constitute in the form of tree-structure, calculation for search may be executed at a high speed.
摘要:
A vector quantizer which transmits the input vector of the time when the minimum distortion is larger than the preset distortion threshold value and stores such input vector into the second code book as the new quantizing representative vector for the use in the successive vector quantizing processes. Further, since the first and second code book constitute in the form of tree-structure, calculation for search may be executed at a high speed.