Fujitsu Corporation

Shin-ichi Maki

Kiichi Matsuda

Toshitaka Tsuda

Takeshi Okazaki

Hirokazu Fukui

Toshihiro Homma

Hiroshi Fukuda

Hirohisa Gambe

Toshi Ikezawa

A differential coding circuit including a subtracter, a quantizer for quantizing a differential signal from the subtracter, and a predicted signal generating circuit for generating a predicted signal on the basis of a quantized differential signal from the quantizer. The subtracter subtracts the quantized differential signal of the quantizer and the predicted signal from the sampled input signal. The critical path of the circuit is shortened, therefore the operation speed of the differential coding circuit increases.

Differential coding circuit with reduced critical path applicable to DPCM

An apparatus for band compression processing of a picture signal which generates forecasting error signal and movement vector and updates only the movement vector during a comb-out operation. During comb-out processing, a picture signal is recirculated while the movement vector is produced and accumulated. At the end of the comb-out processing, the change in the movement vector from the accumulated vector is within a desired range. Therefore, the scale of a circuit for detecting the movement vector after the comb-out operation does not increase.

Apparatus for band compression processing of a picture signal

Growing community of inventors

Yokohama, Japan

Shin-ichi Maki