Abstract: A predictive coding/decoding system for block-formed picture signals includes predictive coding and decoding units in transmitter and receiver sides, respectively: each of the predictive coding and decoding units is provided with a control pulse generator responsive to a horizontal synchronization pulse in the picture signal to produce a sampling signal and a select signal, and a pair of selectors together responsive to the select signal to select a sum of a prediction signal and a prediction error signal or a fixed value as an input of a prediction circuit, the pair of selectors selecting the fixed value for a partial picture block including a fraction of pixels due to the block formation.

Abstract: A television synchronizing signal amplitude detection circuit for detecting the amplitude of composite television signals wherein the period of detection is determined by the vertical synchronizing signal interval including a vertical synchronizing pulse period and an equalizing pulse period preceding and succeeding the vertical synchronizing pulse period.

Abstract: In a digital transmitting system wherein signal information is transmitted from a transmission buffer memory device to a receiving buffer memory device through a transmission line extending therebetween, there are provided a counter for producing count information proportional to a sum of information transmission delay times in the transmission and receiving buffer memory devices, and a read control circuit which controls the read-out time of the information from the receiving buffer memory device such that a count of the counter coincides with a predetermined reference value, thereby rendering a sum of the information transmission delay times coincident with a predetermined time.

Abstract: A digital transmission system for television video signals of the type which comprises a transmitter and a receiver, the transmitter having a plurality of input terminals for receiving respective television video signals to be transmitted, a plurality of encoding units for encoding the respective video signals into digitized video signals, and a multiplexers for multiplexing the respective digitized video signals in a time division manner, and the receiver having a demultiplexer for receiving the multiplexed video signal from the multiplexer and for separating the same into said digitized video signals, and a plurality of decoding units for decoding the digitized video signals into said respective television video signals, is disclosed.

Abstract: A predictive encoder is disclosed which has a non-linear quantizing characteristic. The transmission gain of the quantizer is less than unity when the amplitude component of the predictive error signal is smaller than a predetermined level and is substantially equal to unity when the amplitude component of the predictive error signal is higher than the predetermined level. As a result, undesired redundancy components are effectively suppressed without causing an increase in quantizing noise and a deterioration in information quality.

Abstract: A high speed predictive encoding and decoding system for frequency band compression of television video signals has a transmitting unit and a receiving unit coupled by a transmission link for transmitting a video signal produced through a repeated horizontal and vertical scanning of an optical image. The transmitting unit comprises an A/D converter for digitizing said video signal to provide a series of digitized video codewords at the rate of the sampling of said video signal for digitizing; means, including a pair of memory means for temporarily storing two successive segments of said codeword series segment, for interleaving said codewords of one segment with those of an immediately neighboring segment; and means for predictive encoding of the output of said interleaving means, to provide a series of codewords representative of the predictive encoding output alternately of the neighboring segments.

Abstract: Responsive to signal samples of a color television signal including a carrier chrominance signal, a predictive encoder produces quantized prediction error signals in compliance with a first transfer characteristic (1 - P.sub.1)(1 - P.sub.2), wherein minima which are substantially equal to zero are taken by the absolute value of 1 - P.sub.1 in the neighborhood of frame frequency and by the absolute value of 1 - P.sub.2 in the neighborhoods of zero frequency and subcarrier frequency. Responsive to the quantized prediction error signals, a predictive decoder produces reproduced samples in compliance with a second transfer characteristic of the inverse of the first transfer characteristic.

Abstract: A system for coding a composite color television signal and a system for decoding the received coded composite color television signal are disclosed. Coding is achieved by the use of a sampling frequency lower than the Nyquist sampling frequency to provide a direct-coding system in which the composite television signal is sampled at a timing where the subcarriers stand at phases about 180.degree. away from each other in each scanning line and at a timing where the subcarriers stand at phases about 90.degree. away from each other between adjacent scanning lines. In the decoding system, an interspatial signal component lying at a midpoint between every two sampling points is produced from the sampled signals. A composite television signal is produced from the sample signal and the interspatial signal.