Hitachi Denshi Kabushiki Kaisha

Nippon Hoso' Kyokai

Yuuichi Oonami

Takayuki Tanaka

Atsushi Miyashita

Ryu Watanabe

Yoshizumi Eto

Seiichi Sano

Shuji Usui

In a data coding method for obtaining coded data by dividing input data into different-length division blocks, the input data is divided into different-length blocks in accordance with a distortion value indicative of an error between the input data and approximate data based on the input data; variable length quantized data is obtained by quantizing the approximate data associated with the input data of each of the blocks; status data indicative of the state in which the input data is divided into the blocks is obtained; and the coded data is obtained by combining the quantized data and the status data. When the input data is divided into a plurality of blocks of unequal lengths, the amount of the coded data is determined so that it is substantially coincident with a predetermined data amount.

Data coding method and apparatus using a plurality of blocks of

An image signal compression transmission system for transmitting and receiving a compressed image signal, having a transmitter section which entropy codes digitized image data for transmission, a transmission channel through which entropy-coded codes sent from said transmitter section are transmitted, and a receiver section which decodes said entropy-coded codes received from said transmission channel and derives an original digital image signal. In the transmitter section, digital image data is entropy coded. The entropy-coded codes are transmitted to the receiver section through the transmission channel. In the receiver section, the received codes are entropy code decoded at a decoding speed corresponding to a transmission rate on the transmission channel. Coefficient codes derived by the decoding are stored into a memory at the same speed as the decoding speed. Then, the coefficient codes are read from the memory at a speed different from the decoding speed, but at the same speed as a signal processing rate in a signal processing system subsequent to the memory.

Image data signal compression/transmission method and image data signal

A picture signal encoding multiplexing method and apparatus in which encoded data of a plurality of picture signals, which are respectively output from a plurality of picture signal encoding processing units, is multiplexed in a channel multiplexing unit. The method includes the steps of: generating a transmission rate control signal corresponding to information related to the encoded distortion supplied from each of picture signal encoding processing units in a channel multiplexing unit, and supplying the transmission rate control signal to each of the picture signal encoding processing units; and outputting the encoded data of the picture signal from each of the picture signal encoding processing units in accordance with the transmission rate control signal. The apparatus includes a unit provided in channel multiplexing unit for generating a transmission rate control signal corresponding to information relating to encoded distortion supplied from each picture signal encoding processing unit and for supplying the transmission rate control signal to each of the picture signal encoding processing units; and a unit for outputting, from each of the picture signal encoding processing units, the encoded data of the associated picture signal in accordance with the transmission rate control signal.

Method of encoding and multiplexing picture signals and apparatus

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Iruma, Japan

Yuuichi Oonami