Source: http://www.google.com/patents/US6026211?dq=7,669,134
Timestamp: 2017-07-24 06:05:44
Document Index: 277430016

Matched Legal Cases: ['art 100', 'art 110', 'art 110', 'art 100', 'art 110', 'art 100', 'art 110', 'art 100', 'art 120', 'art 120', 'art 100', 'art 120', 'art 120', 'art 100', 'art 110', 'art 110', 'art 120', 'art 120', 'art 120', 'art 120', 'art 120']

Patent US6026211 - Video recording and reproducing apparatus for recording a video signal and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA recording and reproducing apparatus is disclosed in which video signal and indexing signal are separately recorded in video signal areas and subcode areas, respectively, of diagonal tracks formed on a tape by a rotating head. The apparatus has a tape driver for driving the tape, add/erase command keys...http://www.google.com/patents/US6026211?utm_source=gb-gplus-sharePatent US6026211 - Video recording and reproducing apparatus for recording a video signal and an indexing signalAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS6026211 APublication typeGrantApplication numberUS 09/172,010Publication dateFeb 15, 2000Filing dateOct 14, 1998Priority dateJun 18, 1993Fee statusLapsedAlso published asDE69418535D1, DE69418535T2, DE69426083D1, DE69426083T2, EP0630023A2, EP0630023A3, EP0630023B1, EP0844615A2, EP0844615A3, EP0844615B1, US6011894Publication number09172010, 172010, US 6026211 A, US 6026211A, US-A-6026211, US6026211 A, US6026211AInventorsAkihiko Nakamura, Makoto Gotou, Tatsuro JuriOriginal AssigneeMatsushita Electric Industries, Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (11), Non-Patent Citations (2), Referenced by (9), Classifications (42), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetVideo recording and reproducing apparatus for recording a video signal and an indexing signal
US 6026211 AAbstract
1. A recording and reproducing apparatus for recording a video signal and an indexing signal to separate video signal areas and subcode areas, respectively, of diagonal tracks formed on a tape by a rotating head, said apparatus comprising:tape drive means for driving the tape; an add command generator for generating an add command to add said indexing signal at a requested position; an indexing signal control for setting and resetting said indexing signal; recording means for recording the video signal to the video signal area and the indexing signal, if any, to a subcode area of each track of the tracks; and editing control means for controlling said indexing signal control in response to said add command, such that the tape is rewound past said requested position for a first predetermined length, after which the tape is driven in a forward direction for a second predetermined length shorter than said first predetermined length, the tape then being further driven in the forward direction for a third predetermined length equal to a difference between said first predetermined length and said second predetermined length for recording the tape with the indexing signal, corresponding to a reset state, until the tape reaches said requested position, the tape being further driven in the forward direction for recording the tape with the indexing signal, corresponding to a set state, for a fourth predetermined length, the indexing signal being preserved as long as a leading edge of the indexing signal does not appear within a predetermined distance. 2. A recording and reproducing apparatus as claimed in claim 1, wherein said reset state is recorded immediately before said add command is generated.
3. A recording and reproducing apparatus as claimed in claim 1, further comprising: video signal generator for generating a video signal in frames, each frame having a predetermined length.
4. The recording and reproducing apparatus according to claim 1, wherein said editing control means records said set state at a position on the tape where said add command is generated.
5. The recording and reproducing apparatus according to claim 4, wherein said reset state is recorded for a predetermined period of time before said set state.
6. The recording and reproducing apparatus according to claim 1, wherein said editing control means records said reset state over a predetermined portion of said previous set state.
7. A recording and reproducing apparatus for recording a video signal and an indexing signal to separate video signal areas and subcode areas, respectively, of diagonal tracks formed on a tape by a rotating head, said apparatus comprising:a tape driver that drives the tape; an add command generator that generates an add command to add said indexing signal at a requested position; an indexing signal controller that sets and resets said indexing signal; a recorder that records the video signal to the video signal area and the indexing signal, if any, to a subcode area of each track of the tracks; and an editing controller that controls said indexing signal controller in response to said add command, such that the tape is shifted past said requested position for a first predetermined length, after which the tape is driven in a forward direction for a second predetermined length shorter than said first predetermined length, the tape then being further driven in the forward direction for a third predetermined length equal to a difference between said first predetermined length and said second predetermined length for recording the tape with the indexing signal, corresponding to a reset state, until the tape reaches said requested position, the tape being further driven in the forward direction for recording the tape with the indexing signal, corresponding to a set state, for a fourth predetermined length, the indexing signal being preserved as long as a leading edge of the indexing signal does not appear within a predetermined distance. Description
This application is a continuation application of U.S. application Ser. No. 08/801,181, filed Feb. 18, 1997, pending, which is a continuation application of U.S. application Ser. No. 08/260,998, filed Jun. 16, 1994, abandoned, the contents of both are expressly herein incorporated by reference in their entireties.
When a recording and reproducing apparatus according to the present invention thus comprised overwrites new information to a previously recorded tape from some midposition in a previously recorded indexing information period of a fixed duration, or when the recording start position of a previously recorded indexing information period of fixed duration is within the fixed duration period to which new indexing information is to be recorded, it is possible to determine the recording start positions both before and after re-writing. As a result, using a recording and reproducing apparatus of the invention, a VCR or other recording and reproducing apparatus with an excellent indexing information edit function can be achieved.
FIG. 2 is a diagram showing the placement of rotating heads on the cylinder in the preferred embodiment of the invention,
Subdata 2 is input to the recorder 22 when the. segment number is 5, 6, 7, 8, or 9, and the same data content is also input throughout a single frame regardless of the segment number.
A two byte signal identifying the recording start position of the synchronization block is recorded to the synchronization part 100. The ID part 110 includes two bytes (ID0 and ID1, one byte each) in ID data 111, and one byte in IDP 112, for a total of three bytes in the ID part 110. The ID data 111 is described in detail later with reference to FIG. 4. A parity signal is recorded as IDP 112. The IDP 112 parity signal is used to detect (and thus correct) signal reading errors from the synchronization part 100 to the ID part 110 in the synchronization block. By recording the IDP 112 to this position in one synchronization block, the ID data 111 recorded as ID0 and ID1 can be read by reading from synchronization part 100 to ID part 110. It is not necessary at this time to read the complete synchronization block (from the synchronization part 100 to the data part 120). This is particularly effective for data reproduction when the scan path of the rotating heads crosses the tape tracks diagonally during, for example, a high speed search.
The data part 120-comprises a five byte subdata block 121 and a two byte data parity block 122. The subdata 121 is described in detail later with reference to FIG. 4. The data parity block 122 is a parity signal. This data parity block 122 is similarly used to detect (and thus correct) signal reading errors from the synchronization part 100 to the data part 120 in the synchronization block. The subdata in the data part 120 can be read when the signal from the synchronization part 100 to the data parity block 122 can be read.
ID data 2 is recorded as the ID data 111 of the ID part 110 in track numbers 3, 4, 5, and 6 (ID block 2). Described below in the head scanning order, a 4-bit synchronization block number 113 and 2-bit block ID code 114, each with the same meaning as in ID data 1, are recorded first. The next two bits 117 are b"00." A 2-bit APID 118 and 6-bit COID 119 are then recorded. The APID 118 is identification information indicating the type of data recorded to the ID part 110 and the data part 120. Recording the APID signal makes it possible to change the data content recorded to the data part and the ID part. The COID may also contain ID information for skip-search operations, or table of contents (TOC) ID data.
The subdata 121 recorded to the data part 120 is described next. The absolute position information (subdata 1) is recorded as the subdata (subdata block 1) of the data part 120 in track numbers 0-4. User information (subdata 2) is recorded as the subdata (subdata block 2) of the data part 120 in track numbers 5-9. The detailed positioning of the subdata 121 is shown in FIG. 5. Only the subdata 121 of the data part 120 recorded to the synchronization block of the subcode area 26 is shown in FIG. 5. The absolute time code (ATC 123) and tape counter (TC 124) are recorded to alternating synchronization blocks as the absolute position information in tracks 0-4. The recording date (T1 125) and recording time (T2 126) are similarly recorded to alternating synchronization blocks in tracks 5-9. Note that ATC 123, TC 124, T1 125, and T2 126 are recorded together with an ITEM identification header as required so that the data content can be discriminated using the identification header as may be required during data reproduction.
By structuring the tracks as described above, ID data 1, ID data 2, subdata 1, and subdata 2 can be edited independently. This means that during editing operations in which ID data 1. is re-written, for example, ID data 2, subdata 1, and subdata 2 can be preserved, and the same is true when editing ID data 2, subdata 1, or subdata 2. The user can be provided significantly enhanced freedom of use using a function such as this in a VCR.
Note also that while the indexing ID and program number are recorded as ID data 1, search operations for locating a particular scene can be made much more effective if the indexing ID can be freely inserted after the program content is recorded. Even in such cases, however, it is necessary to preserve the other subcode data (APID, COID, absolute position information, and/or user information). In other words, being able to discretely edit the subcode is an extremely meaningful function.
At step S1, it is detected whether or not an add SRID command is produced by the depression of the add SRID key 40. When the add SRID command is detected, the program goes to step S2 at which the present tape position is detected and stored as data P2. At step S3, a predetermined tape advanced position P6 is calculated by adding P2 with a first predetermined amount ΔD1, a first predetermined tape retreated position P5 is calculated by subtracting second predetermined amount ΔD2 from P2, and a second predetermined tape retreated position P1 is calculated by subtracting third predetermined amount ΔD3 from P2. According to the preferred embodiment ΔD1>ΔD2 and ΔD2=2ΔD3. These positions are shown in each of FIGS. 10A and 10B.
At step S7, the current tape position is detected and is compared with the position P6. If the current tape position reaches the position P6, the tape stops and is rewound (step S8) until the tape is returned back to position P5 (step S9). When the tape is returned back to position P5, the normal replay starts (S10). During the normal replay and when the tape is advanced to the position P1 (step S11), reset data, such as "0", of SRID is marked on the tape. Such a reset of SRID marking continues until the tape moves to the position P2 (step S13). When the tape is advanced to the position P2, it is first detected whether the positions P3 and P4 are recorded or not (step S14). FIG. 10A shows a case when positions P3 and PS are recorded, and FIG. 10B shows a case when-positions P3 and P5 are not recorded.
If the positions P3 and PS are not recorded, the operation advances to step S19 for start writing a new set data, such as "1", of SRID marking up to the position P6 (step S20).
If the positions P3 and PS are recorded, the operation goes to step S15 to start writing a new set data "1" of SRID marking only up to the position P3 (step S16). After the position P3, new reset data "0" of SRID is marked (step S17) up to the position P4 (step S18). Then, from the position P4, another new set data "1" of SRID marking starts up to the position P6 (steps S19 and S20). Thereafter the marking stops (step S21) se that the previously written marking continues thereafter.
As apparent from FIG. 10A, in the case where the leading edge of the previously recorded SRID marking "1" exists within the first predetermined advanced distance ΔD1 from a position where the user intended to insert a new SRID marking, the old and new SRID markings "1" are separately added by: inserting a reset SRID marking "0" between positions P3 and P4.
From FIG. 10B, in the case where the leading edge of the previously recorded SRID marking does not exist in such a predetermined advanced distance ΔD1, the new SRID marking "1" starts from the intended position P2 for a predetermined required tape distance ΔD1 with a reset SRID marking "0" inserted for a tape distance ΔD3 immediately before the leading edge of the newly added SRID marking "1" so that the newly added SRID marking "1" can be distinguished from the old SRID marking "1", if the new marking should start from a middle of the old SRID marking "1".
The length of period L5 is equivalent to the fixed period length (150 frames) minus the length of periods (L2+L3). The length of periods (L2+L3) is equivalent to the length on tape from position P2 (the recording start position of the new SRID set signal) to position P4 (the recording start position of the previously recorded SRID set signal).
As described above, pilot signals of two different frequencies f1 and f2 every other track are recorded frequency multiplexed to the tracking signal area 28 of the recorded tracks. The tracks are recorded in sequence from track 24-0 as f0, f1, f2, f0, f1 . . . . The pilot signal is not recorded to f0 tracks. The pilot signal of frequency f1 is recorded frequency multiplexed to the f1 tracks. The pilot signal of frequency f2 is recorded frequency multiplexed to the f2 tracks.
By thus tracking the rotating heads 2a and 2b to the tape tracks, the signal reproduced by rotating head 2a is input to the ID data 1 detector 35. The tape is driven in a reproducing mode for a 150-frame-equivalent period from position P2 to detect whether a set or reset signal is recorded as the SRID. The SRID set signal recording start position P4 is thus detected, and the tape position is stored by detecting the absolute position information recorded as subdata 1. The position P3 is then calculated from the absolute position information of position P4. The absolute position information is thus used as the positioning information of the rewrite edit operation. It is thus possible to calculate position Pi from position P2.
The editing indicator 33 instructs the capstan control circuit 6 to rewind the tape. In general, the tape can be rewound at a faster tape speed than that of the recording and reproducing operations. Tracking control is not required for the rewind operation. It is assumed here that the rewind tape speed is 3-times the recording speed (i.e., -3×). The information from the subcode area is reproduced from tape while rewinding, enabling the absolute position information to be detected by the subdata 1 detector 37 and the tape to be stopped after being rewound the preset extra amount from the absolute position of position P1. As described above, this extra amount from P1 is equivalent to ten frames, and is shown as position P5 in FIG. 10A.
When the tape is advanced in the reproducing mode to position P1, ID data 1 is written to the tape as controlled by the editing indicator 33. Note that position P1 is determined from the absolute position information detected by the subdata 1 detector 37 from the reproduced signal. The SRID reset signal of ID data 1 is recorded in period L1.
During the ID data 1 writing operation, the edit position selector switch 29 switches at the timing described below between a mode recording the recording signal generated by the recorder 22 and a mode reproducing the signals from the rotating heads 2a and 2b. Specifically, the recording signal record mode is selected when the subcode area of the tracks to which ID data 1 is recorded are scanned, and the mode reproducing the signals from the rotating heads 2a and 2b is selected when all other areas are scanned.
Note that when rewriting the ID data 1, a new signal is recorded only when the head scans the subcode area of tracks 0, 1, 2, 7, 8, and 9. When the head scans the subcode area of tracks 3-6, the recorder/reproducer is in the reproducing mode, and data is therefore read. When rewriting the ID data 1 of the ID part of the synchronization blocks in the subcode areas recorded to tracks 0, 1, and 2, it is necessary to simultaneously rewrite the subdata 1 (absolute position information) recorded to the data part of the same synchronization blocks. It is also essential to retain the previously recorded data in subdata 1. The same subdata 1 is therefore recorded to tracks 3 and 4 in addition to tracks 0, 1, and 2. The subdata 1 recorded to tracks 0, 1, and 2 can thus be produced by a one frame equivalent conversion from the subdata 1 obtained by reproducing tracks 3 and 4 in the previous frame.
When rewriting the ID data 1 recorded to tracks 7, 8, and 9, it is necessary to simultaneously rewrite the subdata 2 (user information )recorded to the data part of the same synchronization blocks. It is also essential to retain the previously recorded data in subdata 2. The same subdata 2 is therefore recorded to tracks 5 and 6 in addition to tracks 7, 8, and 9. The subdata 2 recorded to tracks 7, 8, and 9 is the same as the subdata 2 obtained by reproducing tracks 5 and 6 of the same frame, and can thus be created.
The new subdata 1 is generated by the subdata 1 detector 37 and subdata I generator 15. The new subdata 2 is generated by the subdata 2 detector 38 and the subdata 2 generator 16. Subdata 1 and subdata 2 are then input to the synthesizer 20.
The pulse signal output from the positioning information signal detector 31 is input to the first and second delay circuits 32b and 32c. Each delay circuit then begins counting the internal fixed clock of the recording and reproducing apparatus shown in FIG. 9A, and creates a delay signal by counting this internal clock for a period equivalent to the specified delay times t1 and t2. The subcode editing timing signal shown in FIG. 9C is then generated by inputting these delay signals to the R-S flip-flop 32d as shown in FIG. 8. The subcode editing timing signal is input with the INS-- TR output signal of the comparative operator 32a to AND circuit 32e, and the output of this AND operation is input to the edit position selector switch 29 as the ID data 1 editing timing signal.
If the SRID is rewritten as-described above, it will always be possible to detect or discriminate the recording start position of a previously recorded SRID set signal and the recording start position of the newly recorded SRID set signal. Specifically, the SRID signal level always changes from the reset signal level to the set signal level of the indexing ID period at the SRID recording start position, and it is therefore possible to find the SRID recording start positions by searching for these positions where the signal level changes.
The ID data 111 of this embodiment in described next in the head scanning sequence. A 4-bit synchronization block number 113 is first recorded; this is the same as in FIG. 4. A 2-bit block ID code 114 is then recorded. In this case there is only one ID data block but two subdata blocks, and there are therefore two possible combinations of ID data blocks and subdata blocks. This means that it is sufficient if the block-ID code 114 can distinguish between blocks to which subdata 1 is recorded (subdata block 1) and blocks to which subdata 2 is recorded (subdata block 2). Therefore, b"00" is recorded as the block identification code to tracks 0-4 to which subdata 1 is recorded, and b"10" is recorded as the block identification code to tracks 5-9 to which subdata 2 is recorded. A 1-bit SRID 115 and 1-bit PHID 131 are then recorded. The SRID 115 is the indexing ID as described above. The PHID 131 is an ID code for searching for periods to which a desired image is recorded.
Next, the operation for rewriting the SRID or PHID in ID data recorded as shown in FIG. 11 is described next. The PHID rewrite operation is described below. When the PHID (or SRID) is rewritten in this embodiment, the subcode area of all tracks in the corresponding period is rewritten. It is necessary, however, to retain the data content written to all parts other than the PHID bit. The overall timing of the operation is as described in the previous embodiment. In other words, when recording a new PHID set bit to a previously recorded tape, the operation described in steps (1)-(7) and in steps (11)-(15) is the same as that with the data structure shown in FIG. 4. These operations differ, however, in the method of generating the SRID, APID, and PNO contained in the ID data, and the new subdata 1 and subdata 2, in (4)-(7) and (14), (15).
As described above in the previous embodiment using the data structure in FIG. 4, the mode driving the tape in a data read state ((3) or (13)) changes to a mode rewriting the subcode area ((4)-(7) or (14), (15)) at a specific timing during the rewrite editing operation. The new subdata 1 in this embodiment is generated by incrementing the subdata 1 (absolute position information) detected by the subdata 1 detector 37 during tape travel in the reproducing mode from the moment the rewrite mode is selected (the moment subdata input from the subdata 1 detector 37 stops). Subdata 2 (user data) is similarly created by the subdata 2 detector 38 and subdata 2 generator 16.
Likewise, the APID is the same APID data detected by the ID data 1 detector 35 during tape travel in the reproducing mode. Because of the nature of the APID data, creating the APID data in this way completely preserves the previously recorded information.
Note that functions using this PRM bit shall not be limited to the above printer example, and the PRM bit can be used to, for example, transmit the image data to another storage media. In addition, the PRM recording position shall not be limited to the PHID set recording period. The PRM may be recorded to the reset signal level recording period immediately preceding or immediately following the PHID set recording period. In either case, such functions can be achieved insofar as the relationship to the PHID set recording period is fixed, and the association with the PHID can be maintained after PHID rewriting.
The SRID is normally recorded to a fixed length period from the position to be indexed. It is assumed here that an SRID set marking for indexing position P21 was previously recorded to a 150-frame fixed period (5 sec. equivalent) from position P21. After that, however, a reset marking was recorded to period L22 and the SRID set marking was recorded to the fixed period L23 to enable indexing a new position at position P24, resulting in the signal shown in FIG. 13A(a). It is to be noted that the length of the reset period L22 simply needs to be short relative to the length of the set signal period L23, and it is assumed in the following description to be equivalent to ten frames.
By erasing the information for indexing to position P24 in this way, the SRID signal-for indexing to position P21 is set for the period from position P21 to position P26, i.e., a period sufficiently long for good high speed search performance. The ability to conduct high speed searches for position P21 is thus maintained.
Another example of the edit operation when erasing the indexing ID (reset signal rewrite) is described next with reference to FIG. 13B. In this example the indexing ID (SRID) set signal has been recorded to tape for five seconds (150 frames). The SRID has also been edited, resulting in the SRID signal shown in FIG. 13B(a): the set signal period from position P24 to P34 is 100 frames, the reset signal period from position P34 to P35 is 10 frames, and the set signal period from position P35 to P36 is 150 frames. The object of the following operation is to erase the SRID set signal from position P24 to position P34 on tape.
The present embodiments are also described using a 30 frames/second video signal, but the number of frames shall not be so limited. One frame of the video signal is also described as being recorded in ten segments to ten tracks, but the invention shall not be limited to this number of segments.
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