Matsushita Electric Industrial Co., Ltd.

Hideki Otaka

Masakazu Nishino

Tatsuro Juri

Takayasu Yoshida

Shinya Tanaka

Chiyoko Matsumi

Akira Iketani

Tadashi Ono

Susumu Yamaguchi

Shigeru Awamoto

Makoto Goto

Yukio Nakagawa

Takao Kashiro

Tatsurou Juri

Hidefumi Muraoka

Kazuma Morishige

Shinya Kadono Kadono

Shinichi Togawa

Seigo Fujiwara

A digital data transmission apparatus and a transmission method thereof in accordance with the present invention includes a reproduction section for reproducing digital data of n (n is an integer of 2 or more) channels from a recording medium, a multiplexing section for dividing one frame in a television signal into n transmission areas on a line-by-line basis, and multiplexing digital data of the n channels reproduced by the reproduction section on the n corresponding transmission areas on the line-by-line basis, and a transmitting section for transmitting data multiplexed by the multiplexing section.

Digital data transmission apparatus and method for multiplexing multiplexing multi-channel video data within active video periods

A digital data transmission apparatus and a transmission method thereof in accordance with the present invention includes a reproduction section reproducing digital data of at least one channel from a recording medium, a multiplexing section for dividing one frame in a television signal into n transmission areas on a line-by-line basis, and a transmitting section for transmitting data multiplexed by the multiplexing section.

Digital data transmission apparatus and method for multiplexing different rate digital data within active video periods of a television signal

The receiver and transmitter/receiver in accordance with the present invention comprises a common input terminal for inputting digital data including uncompressed video data or compressed video data, a receiving circuit for carrying out serial-parallel conversion processing for the digital data from the above-mentioned common input terminal and for carrying output, an SDI decoder and an SDTI decoder for inputting data from the above-mentioned receiving circuit and for taking out the digital data including the uncompressed video data and compressed video data, respectively, a distinguishing circuit for distinguishing the transmission format of the input digital data and the presence or absence of the compression of the video data, and a selection switch for selecting data from the SDI decoder or the SDTI decoder on the basis of the result of the distinguishing of the distinguishing circuit.

Receiver and transmitter-receiver

The digital signal recording apparatus of the invention for recording a video signal on a recording medium, includes: a mode setting section for setting a recording mode, the recording mode being one of a standard recording mode and a long-time recording mode having a longer recording time than that of the standard recording mode; a sampling section for sampling the video signal at a sampling number corresponding to the recording mode set by the mode setting section, the sampling number when the selected recording mode is the long-time recording mode being smaller than the sampling number when the selected recording mode is the standard recording mode; a coding section for coding the video signal sampled by the sampling section at a compression rate corresponding to the recording mode set by the mode setting section, the compression rate when the selected recording mode is the long-time recording mode being higher than the compression rate when the selected recording mode is the standard recording mode; and a recording section for recording the video signal coded by the coding section on a recording medium.

Digital signal recording apparatus for sampling and compressing signals according to various recording modes

Digital signal recording apparatus

Recording apparatus, reproducing apparatus, and conversion apparatus

Digital signal recording/reproducing device with editor

A digital video signal reproducing apparatus is arranged such that when a low frequency component of a reproduced signal is extracted, the reproduced signal forms a reproduced image plane. When a low frequency component of a reproduced signal is extracted but a high frequency component thereof is not extracted, the low frequency component thus extracted is compared with a low frequency component of a previously or subsequently reproduced signal. If the two low frequency components are substantially equal to each other, the reproduced signal is concealed to form a reproduced image plane, and if not substantially equal to each other, the reproduced signal forms a reproduced image plane without being concealed.

Digital video signal reproducing apparatus

A decimation or interpolation filter is selectively used for decimation or interpolation of pixel data of a chrominance component of a video signal, In general, the chrominance signal and the luminance signal are closely related to each other and their edge pattern data coincide with each other when reproduced on a picture screen. A filter device for decimation or interpolation of the chrominance signal is arranged to perform a number of filtering actions depending on the presence or absence and location of edge pattern data. The present, absence, and location of the edge pattern data is detected using a luminance signal which is neither decimated nor interpolated.

Filter device for decimation and interpolation of chrominance components

A record unit of coded video data is concealed. The record unit is reproduced from a recording medium and has a first recording block containing a part of a coded video data A which has been obtained by coding m blocks of video data among a plurality of blocks of video data divided from video data of one page, a second recording block containing a part of a coded video data B which has been obtained by coding other m blocks of video data among the plurality of blocks of video data and a third recording block containing in a first part thereof the remaining part of the coded video data A and in a second part thereof the remaining part of the coded video data B. The record unit also contains an address data indicating an address of a border of the first and second parts of the third recording block. The record unit of the coded video data is concealed by detecting an error position where an error of coded video data exists in the record unit, detecting the address data contained in the record unit, comparing the detected address data with an address data contained in a corresponding record unit of a previous page, and determining which part of the record unit should be replaced by a corresponding part of the corresponding record unit of the previous page according to the error position and a comparison result. The part of the record unit thus determined is replaced by a corresponding part of the corresponding record unit of the previous page to thereby conceal the record unit.

Error concealing method

When dividing a video signal composed of horizontal H pixels and vertical V pixels into blocks of (m.times.n) pixels composed of horizontal m pixels and vertical n pixels, when the number of horizontal pixels or the number of vertical pixels is not equal to an integer multiple of m or n, respectively, the video signal is first divided into blocks of (m.times.n) pixels and sub-blocks of a smaller size. Then, a plurality of sub-blocks are put together to make up a block of (m.times.n) pixels.

Video signal block forming method

A digital video signal is shuffled such that blocks of a luminance signal and a chrominance signal existing at a same position on an image plane are contained in a same segment recorded on a recording medium or in a plurality of segments recorded simultaneously in parallel using a plurality of channels. Thus, the luminance signal and chrominance signal being at the same position on the image plane are always obtainable simultaneously even during high-speed reproducing in a digital VTR.

Digital video signal recording/reproducing apparatus

A variable length code encoder is provided in which, during variable length code encoding of video or audio data which has been divided into blocks for ease of transmission or storage, the lowest bit of a particular variable length code in each block of code words which is composed of a special pattern of bits and arranged to appear at no other position than the end of the block, is utilized for carrying a piece of data in addition to the data of the block.

Variable length encoder having sign bit separation

A maximum value of each block after orthogonal transformation is detected, and an output word length after orthogonal transformation is controlled in accordance with the maximum value thus detected. In addition, a plurality of tables each having a plurality of quantizers combinedly used are prepared and a table is selected in accordance with the maximum value of each block, thereby selecting the optimum quantizer in accordance with the data amount thus generated.

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Neyagawa, Japan

Hideki Otaka