Patents by Inventor Yukihiko Iijima

Yukihiko Iijima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4720743
    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.
    Type: Grant
    Filed: November 12, 1985
    Date of Patent: January 19, 1988
    Assignee: NEC Corporation and Nippon Telegraph and Telephone Corporation
    Inventors: Kazumoto Iinuma, Yukihiko Iijima, Hideo Kuroda, Hideo Hashimoto
  • Patent number: 4511920
    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.
    Type: Grant
    Filed: July 20, 1982
    Date of Patent: April 16, 1985
    Assignee: Nippon Electric Co., Ltd.
    Inventors: Yukihiko Iijima, Sadame Kobayashi
  • Patent number: 4472803
    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.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: September 18, 1984
    Assignee: Nippon Electric Co., Ltd.
    Inventor: Yukihiko Iijima
  • Patent number: 4215369
    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.
    Type: Grant
    Filed: December 15, 1978
    Date of Patent: July 29, 1980
    Assignee: Nippon Electric Company, Ltd.
    Inventor: Yukihiko Iijima
  • Patent number: 4179710
    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.
    Type: Grant
    Filed: February 22, 1977
    Date of Patent: December 18, 1979
    Assignee: Nippon Electric Co., Ltd.
    Inventors: Tatsuo Ishiguro, Norio Suzuki, Yukihiko Iijima
  • Patent number: 4173771
    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.
    Type: Grant
    Filed: July 20, 1978
    Date of Patent: November 6, 1979
    Assignee: Nippon Electric Co., Ltd.
    Inventor: Yukihiko Iijima
  • Patent number: 4075655
    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.
    Type: Grant
    Filed: April 5, 1976
    Date of Patent: February 21, 1978
    Assignee: Nippon Electric Co., Ltd.
    Inventors: Yukihiko Iijima, Kazumoto Iinuma, Tatsuo Ishiguro
  • Patent number: 4037248
    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 away from each other in each scanning line and at a timing where the subcarriers stand at phases about 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.
    Type: Grant
    Filed: February 26, 1976
    Date of Patent: July 19, 1977
    Assignee: Nippon Electric Company Limited
    Inventors: Yukihiko Iijima, Tatsuo Ishiguro