Sony Corporation

Tetsuro Suma

Takao Abe

Tetsuo Ogawa

Kaichi Tatsuzawa

Hiroki Kotani

Hisanori Kominami

Digital video data recorded in D-1 format, wherein the video data is recorded in successive block units with each block unit being comprised of several segments recorded in plural tracks and with each segment including unit identifying data, is recovered by scanning the tracks with plural sets of reproducing heads to reproduce plural segments concurrently from plural tracks. The unit identifying data in the segments reproduced by all of the reproducing heads in the plural sets are sensed to detect when the unit identifying data in those segments includes common unit identification, thus determining that all of the segments of a preceding block unit have been reproduced from the record medium. That preceding block unit then can be supplied in its entirety to processing or display devices, such as a television monitor.

Method and apparatus for reproducing a digital video signal

Apparatus for decoding an error detecting or correcting code constructed from digital information data and redundant data for detecting or correcting errors in the digital information data, the digital information data and redundant data being reproduced from a record medium by a playback apparatus that operates in a normal speed mode and fast and slow speed modes, includes a first decoder for decoding the error detecting or correcting code and for generating flag data indicating error conditions of the digital information data, a first memory for storing the digital information data subjected to the decoding in the first decoder, and a second memory for storing flag data. A controller is provided with a mode signal indicating a normal playback mode or a fast playback mode of the record medium playback apparatus for controlling the first and second memories so as to read out the digital information data and flag data, respectively, when the mode signal indicates the normal reproducing mode and so as to read out the digital information data without error and the flag data, respectively, when the mode signal indicates the fast reproducing mode.

Apparatus for decoding error correcting code

Error concealing system for digital data

A digital data recording and reproducing device has an operation of error detection performed with respect to data with a code word length of M bits for m.sub.1 most significant bits and for m.sub.2 least significant bits. Error concealment is done for each of these error detections. When reproducing data at a different tape speed from that at the time of recording an operation of detecting an error in the less significant m.sub.2 bits is inhibited, and the reference of judgement of an error in the data is altered.

Growing community of inventors

Kanagawa, Japan

Tetsuro Suma