Patent EP0606856A2 successfully refreshed from Google Patents.
EP0606856A2
Expired / Lapsed
EP
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Digital video recording device with variable speed reproduction
Assignee: Hitachi Ltd
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Filing: 1994-01-07
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Granted: —
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Expires: 2014-01-07
Abstract
Abstract A digital video tape recorder ("VTR") including a recording and playback circuit. The recording circuit selects data useful for generating images during trick playback operation and records the data in trick play tape segments arranged on a tape to form fast scan tracks. Each fast scan track on a tape comprises trick play tape segments located on a diagonal of the same angle as the angle at which the heads of a VTR are expected to pass over the tape during trick play operation. Data which is used for at least one mode of trick play operation is recorded in each trick play tape segment. The data may also be used during normal playback operation. The recording circuit records normal play data in normal play tape segments. Normal play and trick play tape segments may be arranged to form normal play tracks on the tape, each fast scan track crossing multiple normal play tracks. The playback circuit includes a packet filter, a trick play servo control circuit and a VTR command generator circuit. The packet filter reads packet headers of data packets read from the tape and outputs only data packets intended for use during a user selected mode of VTR operation. The trick play servo control circuit controls tracking so that the heads pass over the fast scan tracks at the correct location and angle. The VTR command generator generates commands to a receiver indicating when the VTR is in trick playback mode.
Inventors
- 👤 Jill Macdonald Boyce
- 👤 Joseph Ellis Augenbraun
- 👤 Jack Selig Fuhrer
- 👤 John Goodchilde Norie Henderson
- 👤 Frank Anton Lane
- 👤 Michael Allen Plotnick
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 22:10
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/40; H04N21/41; H04N21/414; H04N21/4147; G; G11; G11B; G11B15/00; G11B15/18; G11B15/1808; G11B15/1875; H04N19/00; H04N19/30; H04N19/37; H04N19/85; H04N19/89; H04N21/20; H04N21/23; H04N21/236; H04N21/426; H04N21/43; H04N21/433; H04N21/4334; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N7/00; H04N7/015; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; H04N5/765; H04N5/775; H04N5/78; H04N5/782; H04N5/7824; H04N5/7826; H04N5/78263; H04N5/78266; H04N5/783; H04N9/7921; H04N9/806; H04N9/8063; H04N9/8066; H04N9/82; H04N9/8205; H04N9/8227; H04N9/87; H04N9/88; H04N9/888
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
168 words
A method of operating a digital video tape recorder ("VTR") including a set of heads to record digital video data on a tape, the tape including a plurality of tape segments arranged in normal play tracks, the method comprising the steps of: storing a fast scan track angle relative to the length of the tape that the set of heads will trace over the tape during a preselected trick play speed and direction of VTR operation; selecting as a function of the determined fast scan track angle a series of tape segments crossing the width of the tape for use as trick play tape segments to form a fast scan track for the preselected trick play speed and direction of VTR operation; and recording a trick play data block comprising video data useful for generating a recognizable portion of an image, during VTR trick play operation at the preselected trick play speed and direction of VTR operation, in the trick play tape segments of the fast scan track.
Claim 2
Dependent Claim
38 words
The method of claim 1, further comprising the step of recording a normal play data block comprising data for generating images during normal VTR operation in the tape segments not selected for use as a trick play segment.
Claim 3
Dependent Claim
30 words
The method of claim 2, wherein the step of storing the fast scan track angle includes the step of storing the fast scan track angle in a VTR memory device.
Claim 4
Dependent Claim
43 words
The method of claim 2, wherein the step of selecting a series of tape segments includes the step of selecting one or zero tape segments in each normal play track for use as a trick play tape segment of the fast scan track.
Claim 5
Independent Claim
162 words
A method for recording digital video data including trick play data blocks and normal play data blocks on a tape including a plurality of tape segments including normal play and trick play segments, the method comprising the steps of: storing a map including information identifying a fast scan track angle relative to the length of the tape that a set of heads of a video tape recorder ("VTR") will trace over the tape for a preselected trick play speed and direction of VTR trick play operation; locating a fast scan track for the preselected trick play speed and direction of VTR trick play operation using the stored information, the fast scan track comprising a series of trick play tape segments; and recording a trick play data block comprising data useful for generating a portion of an image during trick playback operation of a video tape recorder in each one of the plurality of trick play tape segments of the fast scan track.
Claim 6
Dependent Claim
35 words
The method of claim 5, further comprising the step of recording a normal play data block consisting essentially of data for generating an image during normal VTR playback operation in the normal play tape segments.
Claim 7
Independent Claim
155 words
A method of operating a video tape recorder ("VTR") to record digital video data on a tape comprising normal play tracks, the method comprising the steps of: receiving digital video data including normal play data blocks consisting essentially of data for generating images during normal VTR playback operation, and trick play data blocks comprising data for generating images during VTR trick play operation; determining the location of a plurality of fast scan track segments on the tape to define a fast scan track, each fast scan track crossing the tape diagonally with respect to the length of the tape; and recording a plurality of data blocks on the tape such that at least one trick play data block is recorded in each one of the plurality of fast scan track segments of the fast scan track and at least one normal play data block is recorded in each non-fast scan track segment of the tape.
Claim 8
Independent Claim
140 words
A method of operating a video tape recorder ("VTR") to record digital video data on a tape, the tape including a series of normal play tracks, each normal play track comprising a plurality of tape segments, the method comprising the steps of: determining the location of a plurality of tape segments on the tape to define a fast scan track for a single playback speed and direction of VTR operation, the fast scan track crossing the width of the tape diagonally with respect to the length of the tape and crossing a plurality of normal play tracks, the fast scan track comprising a single tape segment located in each normal play track crossed by the fast scan track; and recording digital video data for generating a recognizable portion of an image in the tape segments of the fast scan track.
Claim 9
Dependent Claim
69 words
The method of claim 8, further comprising the steps of: receiving digital video data; selecting a subset of the received video data from which a recognizable image portion can be generated for recording in the tape segments of the fast scan track; arranging the selected subset of received data into trick play data blocks; recording a trick play data block in each tape segment of the fast scan track.
Claim 10
Dependent Claim
69 words
The method of claim 8, further comprising the steps of: receiving digital video data; selecting a subset of the received video data from which a complete recognizable image can be generated for recording in the tape segments of the fast scan track; arranging the selected subset of received data into trick play data blocks; recording a trick play data block in each tape segment of the fast scan track.
Claim 11
Independent Claim
208 words
A method of operating a video tape recorder ("VTR") to record digital video data on a tape including a plurality of normal play tracks, each normal play track comprising a plurality of tape segments, the method comprising the steps of: storing information identifying segments which are arranged on a diagonal relative to the length of the tape to form a fast scan track for a preselected speed and direction of VTR operation, the fast scan track comprising a plurality of tape segments, each tape segment of the fast scan track located within a different normal play track; selecting video data capable of forming a recognizable image portion; arranging the video data capable of forming a recognizable image portion into a plurality of recognizable image trick play data blocks; selecting video data capable of improving the quality of the recognizable image portion; arranging the video data capable of improving the quality of the recognizable image portion into image improvement trick play data blocks; recording the recognizable image trick play data blocks in tape segments of the fast scan track located in alternating normal play tracks; and recording the improvement trick play data blocks in the segments of the fast scan track not containing recognizable image trick play data blocks.
Claim 12
Independent Claim
145 words
A method of recording digital video data on a tape, the tape including a plurality of tape segments arranged as a series of normal play tracks, the method comprising the steps of: storing information identifying preselected ones of the plurality of tape segments as trick play tape segments and preselected ones of the plurality of tape segments as normal play tape segments; receiving prioritized digital video data including data packets with headers, each header comprising data priority information; reading the data priority information from the data packet headers; selecting the highest priority digital video data for recording in the plurality of trick play tape segments; and recording the selected digital video data in trick play tape segments within the normal play tracks, the trick play tape segments arranged to form a fast scan track located on a diagonal relative to the length of the tape.
Claim 13
Dependent Claim
31 words
The method of claim 12, further comprising the step of recording the received prioritized digital video data, not recorded in the trick play tape segments, in the normal play tape segments.
Claim 14
Dependent Claim
21 words
The method of claim 12, wherein the step of recording the selected digital video data comprises duplicating the selected video data.
Claim 15
Dependent Claim
53 words
The method of claim 13, further comprising the steps of: arranging the trick play data into trick play data blocks including data packets; generating a header identifying at least one trick play tape speed and direction of video tape recorder operation; and associating the header with at least one trick play data block.
Claim 16
Dependent Claim
53 words
The method of claim 14, further comprising the steps of: arranging the trick play data into trick play data blocks including data packets; generating a header identifying at least one trick play tape speed and direction of video tape recorder operation; and associating the header with at least one trick play data block.
Claim 17
Dependent Claim
17 words
The method of claim 15, wherein the header further identifies a plurality of tape speeds and/or directions.
Claim 18
Dependent Claim
60 words
The method of claim 13, further comprising the steps of: arranging the digital video data selected for recording in trick play segments into trick play data blocks; generating a set of error correction bits for at least one trick play data block; and including the generated set of error correction bits in the at least one trick play data block.
Claim 19
Dependent Claim
60 words
The method of claim 14, further comprising the steps of: arranging the digital video data, selected for recording in trick play segments, into trick play data blocks; generating a set of error correction bits for at least one trick play data block; and including the generated set of error correction bits in the at least one trick play data block.
Claim 20
Dependent Claim
90 words
The method of claim 13, further comprising the steps of: arranging the digital video data, selected for recording in trick play data segments, into trick play data blocks; arranging the trick play data blocks into groups of trick play data blocks; generating a set of error correction bits from the data blocks comprising at least one of the groups of trick play data blocks; and including the generated set of error correction bits in one of the data blocks comprising the at least one group of trick play data blocks.
Claim 21
Independent Claim
137 words
A method of recording digital video data on a tape, the tape including a plurality of tape segments arranged as a series of normal play tracks, the method comprising the steps of: storing information identifying preselected ones of the plurality of tape segments as trick play tape segments and preselected ones of the plurality of tape segments as normal play tape segments; receiving digital video data including data packets; prioritizing the digital video data for use in trick play operation; selecting the highest priority digital video data for recording in the plurality of trick play tape segments; and recording the selected digital video data in trick play tape segments within the normal play tracks, the trick play tape segments arranged to form a fast scan track located on a diagonal relative to the length of the tape.
Claim 22
Dependent Claim
33 words
The method of claim 21, wherein the step of prioritizing the digital video data includes i) depacketizing the data packets into codewords, and ii) variable length decoding the codewords to generate codeword data.
Claim 23
Dependent Claim
52 words
The method of claim 22, wherein the step of recording the selected digital video data includes i) variable length encoding the selected subset of digital video data, and ii) packetizing the variable length encoded subset of digital video data; iii) recording the packetized subset of digital video data in trick play segments.
Claim 24
Independent Claim
153 words
A method of recording digital video data on a tape, the tape including a series of normal play tracks, the normal play tracks including normal play and trick play tape segments, the method comprising the steps of: storing information identifying preselected ones of the plurality of tape segments as trick play tape segments and preselected ones of the plurality of tape segments as normal play tape segments; receiving video data; encoding the video data into a digital video data stream including data packets with headers; prioritizing the digital video data for use in trick play operation; selecting the highest priority digital video data for recording in the plurality of trick play tape segments; and recording the selected digital video data in trick play tape segments within the normal play tracks, the trick play tape segments arranged to form a fast scan track located on a diagonal relative to the length of the tape.
Claim 25
Dependent Claim
104 words
A video tape, comprising: a plurality of normal play tape segments containing data for use during normal playback operation; and a plurality of trick play tape segments containing data for use during trick playback operation, the normal play and trick play tape segments arranged as a series of normal play tracks on the tape, each of the trick play tape segments arranged within each of the normal play tracks as part of a fast scan track, each fast scan track comprising two or more tape segments and crossing two or more normal play tracks on a diagonal relative to the length of the tape.
Claim 26
Dependent Claim
111 words
A video cassette, comprising: a magnetic tape including i) a plurality of normal play tape segments, arranged as a series of normal play tracks on the tape; and ii) a plurality of trick play tape segments, each trick play tape segment located in one of the normal play tracks, the arrangement of trick play segments forming a series of fast scan tracks, each fast scan track in the series of fast scan tracks diagonally crossing the normal play tracks, the angle of the diagonal corresponding to the angle a set of heads of a video cassette recorder trace over the tape during trick play operation at a preselected speed and direction.
Claim 27
Dependent Claim
24 words
The video cassette of claim 26, further comprising: a video cassette case for mounting the video tape for use in the video cassette recorder.
References Cited (Backward Citations)
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