US 5,416,651 AGranted

Apparatus for magnetically recording digital data

AssigneeSony Corporation

InventorsAkihiro Uetake, Naofumi Yanagihara, Keiji Kanota

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Abstract

A digital VTR is provided with a block segmenting circuit for converting an input digital picture signal into data segmented into blocks of picture elements, an encoding circuit for compressing and encoding the output data of the block segmenting circuit block-by-block, a channel encoding circuit for channel encoding the encoded output data from the encoding circuit, an audio signal encoding circuit for encoding an input digital audio signal, and an additional code generating circuit for generating an additional control code which includes subdata. The encoded picture data from the channel encoding circuit, the encoded audio data output from the audio signal encoding circuit, the additional control code and pilot signal data for tracking are recorded in skewed tracks traced on a magnetic tape by a magnetic head or heads mounted on a rotary drum, with each skewed track having pilot signal data recorded at least adjacent the end portion of the track at which the magnetic head enters into contract with such track, subdata recorded at the other end portion at which the magnetic head leaves the track, and the picture data and the audio data recorded at an intermediate portion of the track, so that both picture data and audio data can be reproduced with high quality while the subdata can be played back with relatively high accuracy.

Claims19

Dependent claims

An apparatus for magnetically recording digital data on a magnetic tape, comprising:

block segmenting means for converting an input digital picture signal having an input data rate into digital data segmented into blocks each composed of a plurality of picture elements;
encoding means for compressing and encoding the digital picture signal data of each of said blocks;
channel encoding means for channel encoding the encoded data from said encoding means;
audio signal encoding means for encoding an input digital audio signal;
additional code generating means for generating an additional control code including subdata;
means for providing pilot signal data for tracking;
tape guiding drum means with rotary head means thereon for tracing successive tracks on a magnetic tape wrapped on said drum means, with each of said tracks having a head entering end, where said head means moves into contact with the tape, and a head leaving end where said head means moves out of contact with said tape;
and
means for mixing said pilot signal data, the channel encoded picture signal data from said channel encoding means, the encoded audio signal data from said audio signal encoding means, and said subdata so as to provide a sequence of data having an output data rate which is less than 25% of said input data rate, said sequence of data being supplied to said head means for recording in each of said tracks with said pilot signal data recorded at an end portion of the respective track adjacent said head entering end, said subdata recorded at a portion of said respective track adjacent said head leaving end, and said encoded picture signal data and encoded audio signal data recorded at a portion of said respective track intermediate said portions in which the pilot signal data and the subdata, respectively, are recorded.

6 more elements

An apparatus for magnetically recording digital data on a magnetic tape and for reproducing the recorded digital data from the magnetic tape, comprising:

block segmenting means for converting an input digital picture signal into digital data segmented into blocks each composed of a plurality of picture elements;
encoding means for compressing and encoding the digital picture signal data of each of said blocks;
channel encoding means for channel encoding the encoded data from said encoding means;
audio signal encoding means for encoding an input digital audio signal;
additional code generating means for generating an additional control code including subdata;
means for providing pilot signal data for tracking;
tape guiding drum means with rotary head means thereon for tracing successive tracks on a magnetic tape wrapped on said drum means, with each of said tracks having a head entering end, where said head means moves into contact with the tape, and a head leaving end where said head means moves out of contact with said tape;
means for mixing said pilot signal data, the channel encoded picture signal data from said channel encoding means, the encoded audio signal data from said audio signal encoding means, and said subdata so as to provide a sequence of data having an output data rate which is less than 25% of said input data rate, said sequence of data being supplied to said head means for recording in each of said tracks with said pilot signal data recorded at an end portion of the respective track adjacent said head entering end, said subdata recorded at a portion of said respective track adjacent said head leaving end, and said encoded picture signal data and encoded audio signal data recorded at a portion of said respective track intermediate said portions in which the pilot signal data and the subdata, respectively, are recorded;
playback means for reproducing data recorded in each of said tracks when scanned by said head means;
channel decoding means for channel decoding reproduced data from said playback means;
decoding means for expanding and decoding block-by-block the channel decoded data from said channel decoding means;
and
block disassembling means for converting the data expanded and decoded by the block into a digital-picture signal.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/785,413Filed 30 Oct 1991 · continuation in part
Priority: JP 2-29467231 Oct 1990
Granted: 16 May 1995
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

H04N 9/8063
With processing of the sound signal: using time division multiplex of the PCM audio and PCM video signals
G11B 5/0086
On transverse tracks: using cyclically driven heads providing segmented tracks
G11B 5/09
Recording, reproducing, or erasing methods; Read, write or erase circuits therefor: digital recording
G11B 5/187
Structure or manufacture of heads, e.g. inductive: structure or manufacture of the surface of the head in physical contact with, or immediately…