Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Keiichi Ishida

Masaaki Higashida

Hirofumi Uchida

Tatsuro Juri

Tatsushi Bannai

Masaru Higashionji

Katsuo Saigo

Hiroaki Shimazaki

Kenjiro Tsuda

Takeshi Otsuka

Takuma Chiba

Masatoshi Taniguchi

Takashi Masuno

Kei Tasaka

Hiroshi Yohda

Kunio Suesada

Toshihiro Tanaka

Toshiaki Koya

Toshiyuki Kohri

A coder has a binarizing circuit () for converting multivalued data into a binary symbol sequence, the multivalued data being generated from an input signal and having a plurality of contexts, an arithmetic code amount approximating circuit () for calculating a prediction code amount in the predetermined coding unit from the binary symbol sequence, and a coding circuit () for coding the input signal arithmetically on the basis of the prediction code amount. The arithmetic code amount approximating circuit () includes a selector () for dividing the binary symbol sequence into a plurality of groups based on the contexts, a plurality of code amount approximating circuits (-) for calculating, from the binary symbol sequence divided into a plurality of groups, the prediction code amount of the group based on at least the section range in arithmetic coding, and an adder () for adding the prediction code amounts from all code amount approximating circuits and outputting the prediction code amount in the specified coding unit.

Coder

The coding apparatus according to the present invention is a coding apparatus which codes data regarding a moving picture, and includes: a DCT coefficient advanced-coding unit which performs advanced-coding on multivalued data representing a quantized DCT coefficient or a motion vector, so as to reduce the bit length of binary data obtained by binarizing the multivalued data; an advanced-coded coefficient/binary coefficient conversion unit which converts the advanced-coded data obtained by the DCT coefficient advanced-coding unit into the binary data; and an arithmetic coding unit which performs arithmetic coding on the binary data obtained by the advanced-coded coefficient/binary coefficient conversion unit.

Coding apparatus and decoding apparatus

Apparatus is adapted for recording and reproducing compressed video data in a selected one of two recording formats, of which a first format is for recording the compressed video data in N (N&gE;3, and representing an integer) number of tracks on a magnetic tape by dividing the video data into N number of groups, and a second format is for recording data, as auxiliary data independent from the compressed video data, in two of the tracks at both ends, and the compressed video data in (N&minus;2) number of the tracks. In the second recording format, the recording is carried out by setting a data length of an error correction code for sync blocks longer than a data length of another error correction code for sync blocks in the first recording format.

Magnetic recording and reproducing apparatus of helical scan type

A video signal processing apparatus which receives a digital video signal having arrangement of pixels frame by frame as an input, performs compressively coding to the digital video signal, and reproduces compressively coded data, comprises blocking unit for performing block dividing process by dividing the video signal of one frame into first blocks having a first format and second blocks having a second format which is different from the first format, performing block changing process by changing the format of the second blocks to the first format, and producing a converted video signal composed of plural blocks having the first format; and compressive coding unit for performing compressive coding including discrete cosine transform process to the converted video signal produced by the blocking unit.

Video signal processing apparatus, and video signal processing method

A magnetic recording and reproducing apparatus includes a reading and writing head for writing data on data tracks formed on a recording tape and reading the data therefrom to produce a first reproduction data. A simultaneous reproducing head is provided for reading a second production data from the data track just being written or read by the reading and writing head. A delay unit delays the first signal by a predetermined phase difference factor to arrange the first and second reproduction data on the same time base. A determiner is also provided for selecting either of said first and second reproduction signals whose signal quality is better than the other.

Magnetic recording and reproducing apparatus with signal delay and

A digital video signal recording apparatus records a video signal expressed by four digital components such that even numbered pixel is expressed by a first type luminance signal component and two color difference signal components, and odd numbered pixel is expressed by a second type luminance signal component. For the 525/60 NTSC system with 3-segment and 4-channel arrangement, one field video signal is stored in three segments. The recording apparatus has a standard channel order generator for generating a standard channel order of a recurring channel pattern. The four digital components are aligned based on the recurring channel pattern so that the first type luminance signal component and two color difference signal components for the even numbered pixel are stored in a same segment by the same channel. As a result, the samples for the same-position pixels are recorded by the same recording head, adjacent samples are recorded by different heads, and error concealment functions effectively.

Digital video signal recording apparatus and method

An apparatus is described for rearranging the relative positions of data samples of a digital video signal within each field of the video signal, for use in a digital VTR in which alternate samples are separated into two different recording channels to be recorded on different tracks of a recording medium. The apparatus includes an intra-line shuffling circuit and a field memory into which output data from the shuffling circuit are written, such that adjacent samples which are of the same channel and are located mutually adjacent in the same line of the video signal are read out from the memory and recorded on respectively different tracks of the recording medium, thereby ensuring that if a sample is lost due to a read error, the adjacent samples of the same channel will always be available for use in interpolation processing to compensate for the lost sample.

Data rearrangement processing apparatus for digital video signal

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Hyogo, Japan

Keiichi Ishida