Recording and reproducing device

[Technical field to which the invention belongs] The present invention relates to a technical field related to recording and reproduction of video, and particularly to a recording / reproducing device when recording / reproducing with a helical scan VTR.

PROBLEM TO BE SOLVED: To record and reproduce video information, a so-called helical scan VTR in which a magnetic head is attached to a rotating drum and the head is scanned obliquely with respect to a tape for recording is the main force.

[0003] Since the video signal to be recorded is transmitted in a signal format having a constant periodicity, the device for recording and reproducing the video signal also employs a mechanical recording mechanism synchronized with the video signal. Specifically, the video signal transmitted by the NTSC method transmits an image of 30 frames per second, and the VTR that records it rotates the rotating cylinder 30 times per second and outputs an image of 1 frame per rotation. A segment recording method is adopted in which the image is recorded or the frame is divided and recorded at an integral multiple rotation speed (for example, 150 rotations). The former is mainly a recording method for analog VTRs, and the latter is mainly a recording method for digital video VTRs.

[0004] The tape pattern for recording is recorded with the tape pattern that consumes the least amount of tape, while considering the convenience after recording and playback (easy to edit and record or cut and edit again on the recorded tape). There is.

[0005] Further, in order to enable post-recording editing in camera coverage and the like, mechanical accuracy, tape deformation, etc. are considered so that compatibility can be ensured between the recording device and the device for subsequent editing. The tape format has been decided. In order to allow compatibility regeneration generally playhead double tiger track width required for reproducing a track width (off-track margin) defining so as to be positioned on the track during playback to click width That is a guideline for tape format.

[0006] Hereinafter, a conventional playback recording device will be described by taking a broadcast VTR using a 6.35 mm wide tape as an example.

[0007] The conventional VTR for broadcasting conforms to the SMPTE (Society of Motion Picture and Television Engineers) standard D-7 format, uses a tape with a tape width of 6.35 mm, and attaches a pair of heads to a rotating cylinder having a diameter of 21.7 mmΦ. It uses a segment recording method that rotates at 9000 rpm (round per minutes) and divides one frame of video, which is the basic unit of NTSC video data, into 10 tracks for recording. The tape feed rate is 33.8 mm / sec, and the track pitch (track width) is 18 μm.

[0008] FIG. 7 shows a recording method of a conventional broadcasting VTR. As shown in the figure, one frame of compressed video data is divided into 10 tracks and recorded. The track pitch of each track is 18 μm.

[0009] The recorded video information is a video signal compressed to about 25 Mbps and audio data of about 1.5 Mbps, and an ECC (Error Correcting Code) code, SYNC (Synchronous) data, ID data indicating information about the video information, etc. are added. It has been recorded at a total recording rate of 41.85 Mbps.

[0010] Here, the track width substantially required for recording / playback is about 9 μm, and the track pitch is taken into consideration for video editing while considering output reduction / performance variation due to compatible playback, envelope fluctuation, environmental change, and the like. Is set to 18 μm. At a track pitch of 18 μm, compatible playback and compatibility via different VTRs are taken into consideration, even when considering track linearity (deviation width during recording) of 3 μm, head trajectory (mounting height accuracy), environmental changes, and output variations. Even if editing is performed, it is possible to reproduce the recorded track width by 9 μm in the worst condition, which guarantees the editing function.

[0011] In recent years, in the conventional VTR for broadcasting, in order to pursue high image quality of a video signal, it is required to be able to record in a longer recording time than recording in a conventional tape format. For example, a higher quality HD signal may be recorded instead of the normal NTSC signal. In order to record high-definition HD signals, conventional broadcasting VTRs compress one frame of HD signals to 100 Mbps and operate the recording head that recorded 25 Mbps video signals in parallel for 4 channels, which is four times as much. The recording rate has been achieved.

[0012] Fig. 8 shows a configuration diagram of a head tape of a conventional broadcasting VTR. As shown in the figure, the recording head and the playback head each operate two sets of 4 channels in parallel for playback. In this case, in order to record at a track pitch of 18 μm, the tape feed rate is 135.2 mm per second, the feed cylinder rotates at 9000 rpm, and recording is performed with four pair heads. Since 10 tracks were recorded on 1 channel, the number of recording tracks per frame is 10 x 4 = 40.

FIG. 9 shows a track format in a conventional broadcast VTR. As shown in the figure, one frame of compressed video data is divided into 40 tracks and recorded. The track pitch of each track is 18 μm. Recording at a track pitch of 18 μm ensures compatible playback between devices in any coverage environment, and provides the same high reliability as when recording SD signals with a conventional broadcast VTR.

[0014] Although it is possible to improve the image quality by using 4 channels of the recording head, the recording time is reduced to 1/4 because 4 times as much tape as in the case of 1 channel is consumed. That is, in the case of storing a high-quality video signal, the amount of data is large even if the compression process is performed, so that the amount of tape consumed increases, resulting in an increase in cost.

[0015] Therefore, a track format has been proposed in which the consumption of tape can be saved by narrowing the track pitch (hereinafter referred to as narrow track), and long-time recording and coverage costs can be reduced.

[0016] [Problems to be Solved by the Invention] However, even a long-time recording device that records on a narrow track needs to have an editing function, and is used for cutting and editing several scenes and connecting them. It is necessary to correspond. However, if different scenes are connected by another VTR after the continuously recorded scenes, the tracks may overlap and the last track of the previous scene may be erased as shown in FIG.

[0017] Fig. 10 shows the state of the tape after joining. In the figure, B36 to B40 are the data tracks of the previous frame, and A1 to A5 are the tracks that are connected and recorded later. The figure shows the case where the A1 track overlaps the B40 track due to an error and most of the B40 track is erased.

[0018] When the last one track is erased, the video signal for one track out of 40 tracks is lost in the last frame, error correction becomes impossible, and practically, the image of the previous frame of the final screen on the screen is used. Although a complementary function is provided to prevent failure, the reproduced image has the inconvenience of having a discontinuous pattern. If this connection is repeated several times in a short range, a jerky pattern with a correction screen for each edit point will be created and cannot be used for broadcasting.

[0019] An object of the present invention is to provide a recording / reproducing device capable of recording / reproducing a video signal in a tape format capable of recording for a long time without causing a problem in a reproduced image due to an editing operation.

[0020] Furthermore, in order to maintain compatibility with the conventional tape format, one VTR easily supports two types of formats, one for recording and playback with a relatively wide track pitch and the other for recording and playback with a relatively narrow track pitch. It is an object of the present invention to provide a recording / playback apparatus capable of performing.

[Means for Solving the Problem] In order to solve this problem, the recording / playback device of the present invention records compressed video data per unit time on n tracks on a tape at both ends. Data independent of the compressed video data is recorded on the two tracks as auxiliary data, and the compressed video data is recorded on the central (n-2) tracks.

[0022] This makes it possible to provide a recording / playback device capable of recording a video signal for a long time in a tape format that does not affect the editing work.

[0023] Further, the first recording format for recording the compressed video data on n tracks on the tape and the auxiliary data on the two tracks at both ends are recorded on the (n-2) tracks for the compressed video. It is possible to select and record one of the second recording formats for recording data.

[0024] This makes it possible to provide a recording / playback device that can easily support two types of formats, one for recording / reproducing with a relatively wide track pitch and the other for recording / reproducing with a relatively narrow track pitch, with one VTR.

【0026】<u style="single">BEST MODE FOR CARRYING OUT THE INVENTION</u> The first of the present invention<u style="single">1</u>The present invention is an apparatus for recording compressed video data obtained by compressing a video signal per unit time on a magnetic tape track, in which n tracks (an integer of n 3) on the magnetic tape are used. It is a recording / playback device that records data independent of the compressed video data on the two tracks at both ends as auxiliary data and records the compressed video data on the central (n-2) tracks. By making the data length of the sync block shorter than the data length of the sync block of the compressed video data, the data acquisition rate at the time of high-speed playback can be increased.

[0027] Further, by setting the data length of the auxiliary data sync block to 1/2 or less of the data length of the compressed video data sync block, the performance of high-speed reproduction can be further improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) In the present embodiment, there is a first recording format for recording compressed video data on n tracks (an integer of n 3) on a magnetic tape, and 2 on n tracks. A recording device for recording auxiliary data on a book track and (n-2) selecting one of the second recording formats for recording the compressed video data on the book track will be described.

FIG. 1 shows a block diagram of a recording / reproducing device according to an embodiment of the present invention.

As shown in FIG. 1, 101 and 102 are A / D converters that A / D convert input audio data and video data, respectively, and 103 is image data output from the A / D converter 102. Compression means to compress, 104 is a format selection means to select the tape format, 105 is an auxiliary data generation means to generate auxiliary data, 106 is an auxiliary data generation means 105 to generate auxiliary data, and the compressed image data and auxiliary data are formatted. Recording processing means arranged according to the format selected from selection means 104, 107 is a recording amplifier, 108 is a recording head that records data on a magnetic tape, 109 is a playback head that reproduces data recorded on a magnetic tape, 110. Is a playback amplifier, 111 is an auxiliary data restoration means for restoring auxiliary data, 112 is an auxiliary data restoration means 111 for restoring auxiliary data according to the format selected from the format selection means 104, and compressed video data from the reproduced data. The reproduction processing means 113 is a compression / decoding means for decoding the compressed video data output from the reproduction processing means 112, and 114 and 115 are D / A converters for D / A conversion of the input audio data and video data, respectively. Is.

[0034] Hereinafter, in the present embodiment, a track format in a broadcasting VTR using a 6.35 mm wide tape will be described as an example.

[0035] The broadcasting VTR in the present embodiment conforms to the SMPTE standard D-7 format, the video signal to be recorded is a high-definition HD signal, the HD signal 0 is compressed to 100 Mbps, and the recording head is connected in 4 channels in parallel. It operates and achieves a recording rate of 4 times. FIG. 2 shows a configuration diagram of a head tape in the broadcasting VTR of the present embodiment.

As shown in FIG. 2, both the recording and playback heads are operated in parallel on 4 channels to perform recording and playback. In this case, in order to record at a track pitch of 18 μm, the tape feed rate is 135.2 mm per second, the feed cylinder rotates at 9000 rpm, and recording is performed with four pair heads. The number of recording tracks per frame is 40 (n = 40).

[0037] The video information recorded by one recording head is a video signal compressed to about 25 Mbps and audio data of about 1.5 Mbps, and ECC (Error Correcting Code) code, SYNC, ID data, etc. are added to the total recording rate of 41.85 Mbps. Record with.

[0038] The track width substantially required for recording / playback is about 9 μm, and the track pitch is set to 18 μm in consideration of video editing while considering output reduction / performance variation due to compatible playback, envelope fluctuation, environmental change, etc. It is set. At a track pitch of 18 μm, even if the track linearity of 3 μm, head trajectory (mounting height accuracy), environmental changes, and output variations are taken into consideration, compatible playback and compatible editing via different VTRs are the worst. It is possible to reproduce the recording track width by 9 μm in the state, which guarantees the editing function.

[0039] Hereinafter, the processing at the time of recording will be described.

First, the A / D converters 101 and 102 A / D convert the input audio data and video data, respectively.

Next, the compression means 103 divides the video signal input from the A / D converter 102 into 5400 macroblocks for each frame, and discrete cosine transform, Huffman code, etc. for each macroblock. Compress to about 100 Mbps by high efficiency coding.

[0042] The format selection means 104 selects a track format. In the present embodiment, the format selection at the time of recording is performed by pressing the manual switch (not shown) of the VTR, determining the operation mode, and performing the recording operation, and the format selection means 104 receives information from the manual switch. It receives and selects a format, and outputs the format information to the recording processing means 106.

[0043] Hereinafter, the format selected by the format selection means 104 will be described.

FIG. 3 shows two formats that can be selected by the format selection means 104, FIG. 3A shows a normal track format, and FIG. 3B shows a narrow track format. As shown in Fig. (A), the normal track format divides one frame of compressed video data into 40 parts and arranges them on 40 tracks on a normal track with a track pitch of 18 μm.

Further, as shown in FIG. 4B, the narrow track format performs narrow track recording with a track width of 1/2 in order to record for a long time in a broadcasting VTR compatible with HD, so that the tape speed is increased. It runs at 67.6 mm / sec, which is 1/2, and records at a track pitch of 9 μm, and one frame of compressed video data is concentrated on 38 of the 40 tracks on a narrow track with a track pitch of 9 μm. Specifically, if the video frame is 30 frames per second, the rotation speed of the cylinder is rotated at the current 9000 rpm and recorded on 4 channels, and the compressed video data is concentrated on 38 tracks instead of 40 tracks, resulting in Short wavelength recording.

[0046] Here, if the number of tracks to be recorded is reduced by two, the amount of information recorded on one track is increased by that amount, resulting in short wavelength recording, and when HD is recorded by the broadcasting VTR of the present embodiment. When one frame is distributed over a large number of 40 tracks and segment recording is performed, the decrease in recording wavelength is (38/40). Since the deterioration of the recording / reproducing performance due to the decrease of the recording wavelength at a rate of 10% or less can be dealt with by the current technology such as improving the head and the tape, it is not considered to be a particular problem in this embodiment.

Further, data that does not cause a problem even if it may be erased at the time of editing is arranged as auxiliary data on the tracks at both ends.

[0048] The recording processing means 106 has compressed video data output from the compression means 103, audio data output from the A / D converter 101, and auxiliary data generation means 105 according to the format selected by the format selection means 104. Place more output auxiliary data.

Hereinafter, the operation of the recording processing means 106 will be described in detail.

[0050] First, when the format selection means 104 selects the normal track format, the compressed video data to be recorded is about 100 Mbps because there are 4 channels of recording heads, and an outer code and an inner code which are error correction codes are added to the compressed video data. However, if audio and other data are added, the total data will be about 167 Mbps.

[0051] The recording processing means 106 divides the compressed video data into 40, and arranges each of the divided compressed video data in a data format having a sink block as a recording unit.

FIG. 4A shows a configuration diagram of a sync block of one compressed video data divided into 40 parts. As shown in the figure, the compressed video data sync block consists of a 2-byte sync pattern as the block header, 3-byte ID data indicating the location of the data, 77-byte compressed video data, and 8-byte error correction code. It is arranged in the order of the inner code and consists of 90 bytes as a whole. The sync block of the outer block is the compressed video data of the sync block of the compressed video data replaced with the outer code.

[0053] Here, since one frame is divided into 5400 macroblocks and 40 tracks on the magnetic tape, the compressed video data of 5400 ÷ 40 = 135 macroblocks is recorded per track. To. Since the compressed video data of one macroblock is recorded in one sink block, 135 sink blocks of data are recorded per track.

[0054] In the present embodiment, 3 sync blocks of VAUX (Video auxiliary) data are stored per track, and 138 sync blocks of data are stored per track. VAUX data stores important data such as VTR features.

The recording processing means 106 collects 138 compressed video data sink blocks, adds 11 outer code sink blocks for error correction, outputs a total of 149 sink blocks to the recording amplifier 107, and records the data. The recording head 108 is made to record via the amplifier 107.

[0056] In the present embodiment, the number of sink blocks of the outer code is set to 11 in consideration of correction capability, redundancy, wavelength, circuit scale, and the like.

[0057] The recording head 108 records the data input from the recording amplifier 107 in the area of the video sector of one track, and then adds the tracking signal used for recording / playback by 24/25 modulation and records it on the tape.

[0058] Fig. 3 (a) shows the data per frame recorded on the magnetic tape. As shown in the figure, one frame of data is recorded on 40 tracks.

Next, when the format selection means 104 selects the narrow track format, the compressed video data to be recorded is the same as when recording in the normal track format, and is compressed to about 100 Mbps.

[0060] Even in the case of the narrow track format, the method of recording the compressed video data is performed with the sink block as the recording unit as in the case of the normal track format. The configuration of the sync block for compressed video data is as shown in Fig. 4 (a). In this case, 40 sets of 149 sink blocks, for a total of 5960 sink blocks, are recorded concentrated on the central 38 tracks as shown in Fig. 3 (b).

[0061] When the number of sink blocks is not divisible by 38 as in the present embodiment, a dummy sink block is added so as to be divisible by 38, and the same number of sink blocks are recorded on each track. In this case, the number of sink blocks recorded in one track is 157, which is the value obtained by rounding up (5960/38), and (157 x 38) -5960 = 6 dummy sink blocks are added.

[0062] When the narrow track format is selected, the recording processing means 105 requests the auxiliary data generating means 105 to generate the auxiliary data.

[0063] The auxiliary data generation means 105 receives a request for auxiliary data generation from the recording processing means, generates auxiliary data, and outputs the auxiliary data to the recording processing means 106. In the present embodiment, as auxiliary data, search data that can be reproduced even in high-speed reproduction in which the data of the central track is not reproduced at the time of search is generated as auxiliary data. In the present embodiment, the low frequency component extracted from the compressed video data is used as the auxiliary data for searching. Since the low frequency component is the same image information data as in the low-speed search, the discomfort of the search image is small, and since it is extracted from the compressed video data, there is no need to create new data at the time of the search.

[0064] Auxiliary data is recorded on the tracks at both ends with the sink block as a recording unit. The sync block length of the auxiliary data is recorded shorter than the sync block length of the compressed video data in order to increase the limit value of the speed at which the sync block can be reproduced during high-speed reproduction.

[0065] It is desirable to set the sync block length of the auxiliary data to 1/2 or less of the sync block length of the video main data. As a result, the data acquisition rate during high-speed playback is clearly higher, and the limit speed is almost doubled. In the present embodiment, it is set to 1/3 of the data length of the sync block of the compressed video data. As a result, the double speed at which one sink block can be taken at the time of search becomes larger.

FIG. 4 (b) shows a sink block configuration diagram of auxiliary data. The auxiliary data sync block is a data block header with a 2-byte sync pattern, 3-byte ID data indicating the location of the data, low-frequency components extracted from 17-byte compressed video data, and error correction. The inner code is 8 bytes, and is composed of 30 bytes as a whole.

As shown in the figure, since the sync block length of the auxiliary data is 1/3 of the sync block length of the compressed video data, the number of sync blocks arranged on one track is the number of sync blocks of the compressed video data. The number is tripled to 447.

[0068] The recording processing means 106 outputs 447 auxiliary data sink blocks to the recording amplifier 107, and causes the recording head 108 to record the data via the recording amplifier 107.

[0069] The recording head 108 records the sync blocks of the compressed video data and auxiliary data input from the recording amplifier 107 on the tracks at both ends. For the compressed video data, the tracking signal used for recording and playback is added by 24/25 modulation and recorded on the tape.

[0070] Hereinafter, processing during playback will be described.

The reproduction head 109 reproduces the data recorded on the tape and outputs the data to the reproduction amplifier 110. The reproduced data is output to the reproduction processing means 112 via the reproduction amplifier 110. The reproduced compressed video data is recorded in the normal track format shown in FIG. 3A or the narrow track format shown in FIG. 3B.

[0072] The format selection means 104 selects either a normal track format or a narrow track format at the start of playback, acquires format information stored in the playback data, selects the format, and performs playback processing. Output the format information to means 112.

[0073] The reproduction processing means 112 outputs the audio data among the reproduced data to the D / A converter 114, reproduces the video data every 40 tracks, extracts the compressed video data, and sends the compressed video data to the compression / decoding means 113. Output.

[0074] When the narrow track format is selected, the reproduction processing means 112 outputs the data of two tracks at both ends of the reproduced 40 tracks to the auxiliary data restoration means 111, and restores the auxiliary data. In the present embodiment, the low frequency component extracted from the compressed video data is used as the auxiliary data for searching. Since the low frequency component is the same image information data as in the low-speed search, the discomfort of the search image is small, and since it is extracted from the compressed video data, there is no need to create new data at the time of the search.

[0075] The search image is generated by the auxiliary data of each frame when the search data is recorded for each frame, and when the search data is divided into a plurality of frames and recorded, the auxiliary data of a plurality of frames is generated. Read and generate data.

[0076] The auxiliary data restoration means 111 restores the input data as auxiliary data for each track. Auxiliary data is recorded in sync block units as shown in Fig. 4 (b), and is composed of 447 sink blocks. The auxiliary data restoration means 111 corrects an error by the inner code stored in the auxiliary data sink block, restores the auxiliary data, and outputs the auxiliary data to the reproduction processing means 112.

[0077] The reproduction processing means 112 extracts compressed video data from the reproduction data of 40 tracks according to the track format selected by the format selection means 104. If the track format is the normal format, the playback data of 40 tracks is processed, and if the track format is the narrow track format, the playback data of 38 tracks located in the center is processed, and the compressed video data is extracted by performing playback processing for each track.

[0078] As shown in FIG. 4A, the compressed video data for one track is composed of 149 sink blocks. The reproduction processing means 112 performs error correction using the inner code, then performs error correction using the outer code, extracts compressed video data, and outputs the compressed video data to the compression / decoding means 113.

[0079] The compression / decoding means 113 performs the reverse processing of the compression means 103 to decode the compressed video data output from the reproduction processing means 112, and outputs the compressed video data to the D / A converter 115.

[0080] The D / A converters 114 and 115 D / A convert and output the input audio data and video data, respectively.

[0081] As described above, according to the present embodiment, when recording in the narrow track format for long-term recording, for example, by joining after the continuously recorded scenes, as shown in FIG. Even if B40, which is the last track of the previous frame, and A1 of the first track of the connecting frame overlap, auxiliary data is recorded on the tracks at both ends and no video data is recorded, so the video is lost. Playback can be performed smoothly without any problems, and there is no inconvenience in the video data due to the editing work.

[0082] In the present embodiment, the tracking signal is not generated when the auxiliary data is recorded, but 24/25 modulation that generates the tracking signal may be performed also in the auxiliary data. By adding a tracking signal, the tracking accuracy during normal playback is improved.

[0083] Further, the auxiliary data is for reading the outline of the data at the time of searching, and it is not necessary to add the outer parity for each track. Further, the auxiliary data recorded here may be an outline of the video data or data accompanying the image data. In addition, there is no problem even if it is read during normal playback.

[0084] Further, auxiliary data is normally recorded on both tracks, and an erasure signal is recorded on a single frequency that does not hinder recording and reproduction or an erasure head on the recording start track or the recording end track during editing. You may. As a result, the data reproduction performance is usually improved by the auxiliary data, and it is possible to prevent interference from tracks of the same azimuth caused by overlapping tracks at the editing point.

[0085] Further, although the number of sync blocks of the compressed video data, the outer code, and the auxiliary data has been described as 138, 11, and 447, respectively, the present invention is not limited to this. The number of sink blocks of the outer code may be an optimum value in consideration of correction capability, redundancy, wavelength, circuit scale, and the like.

[0086] Further, the components of the sink block and the data lengths of the components are not limited to the values described in the present embodiment.

[0087] Further, in the sync block of the compressed video data, the VAUX data of the three sync blocks is stored, but the VAUX data does not necessarily have to be stored. By storing VAUX data, important auxiliary data such as VTR features can be stored as part of the compressed video data.

[0088] Further, although the recording processing means 106 requests the auxiliary data generation means 105 only in the narrow format, the auxiliary data generation means 105 may also be requested in the normal format. In this case, in the case of the normal format, it can be dealt with by controlling so that the generated auxiliary data is not recorded.

[0089] Further, the format selection method of the format selection means 104 at the time of recording and reproduction is not limited to the method described in the present embodiment.

(Embodiment 2) In the track format of the first embodiment, the number of recorded tracks of the compressed video data of one frame is (38/40), and the reduction rate is small, so that the recording wavelength is a short wavelength. The effect of becoming was small on the reproduction performance. However, for example, in the case of a broadcasting VTR that records one frame on 10 tracks, if the compressed video data is concentrated on the central 8 tracks as in the first embodiment, the recording wavelength becomes (8/10), which is 20% higher. This results in forcing a density record, which is not desirable in this case. If the recording wavelength is shortened by 20% or more, the tape medium needs to be drastically improved, and two-format recording using the same tape becomes impossible.

[0091] In the present embodiment, a recording / playback device capable of recording video data for a long time without any trouble in a broadcasting VTR that records video data in a format in which the number of tracks for recording one frame is small will be described.

FIG. 1 shows a block diagram of a recording / reproducing device according to a second embodiment of the present invention. The configuration of the recording / playback device of the present embodiment is the same as the configuration of the recording / playback device of the first embodiment, and the VTR for broadcasting conforms to the SMPTE standard D-7 format as in the first embodiment.

[0093] The difference between the second embodiment and the first embodiment is the processing of the format selected by the format selection means 104 and the corresponding recording processing means 106 and reproduction processing means 112.

Therefore, in the present embodiment, only the format selected by the format selection means 104, the operation of the recording processing means 106, and the operation of the reproduction processing means 112 will be described.

FIG. 6 shows a track pattern selected by the format selection means 112. Figure (a) shows a normal track format that records at a track pitch of 18 μm, and Figure (b) shows a narrow track that records a track width of 1/2 and records at a track pitch of 9 μm for long-term recording. Indicates the format.

[0096] As shown in FIG. 6A, in the recording in the format of a normal track having a track pitch of 18 μm, one frame of compressed video data is recorded on 10 tracks (n = 10). As shown in Fig. (B), in the narrow track format, compressed video data of one frame with a track pitch of 9 μm is placed on 10 of the 12 tracks, and auxiliary data is placed on the tracks at both ends. And record. The number of revolutions of the cylinder will be 10800 rpm, which is 20% higher than that of a normal truck format, and the recording wavelength will be the same. The recording time is (18/9) x (10 x 12) = 5/3 times.

[0097] In the recording processing means 106, when the format selection means 104 selects the normal track format, the compressed image data of one frame is divided into 10 and arranged on 10 tracks, and when the narrow track format is selected, the recording processing means 106 divides the compressed image data into 10 parts. , 1 frame of compressed image data is placed on 10 tracks in the center of 12 tracks, auxiliary data generated by auxiliary data generation means 105 is placed on 2 tracks at both ends, and compressed video data and auxiliary data are in track units. As shown in Fig. 4, the sync block is recorded as a unit.

On the other hand, when the format selection means 104 selects the normal track format, the reproduction processing means 112 performs the same processing as in the first embodiment for each of the 10 tracks to reproduce the compressed video data. When the narrow track format is selected, the compressed video data is reproduced by performing the same processing as in the first embodiment for each of the 10 tracks in the center of the 12 tracks, and the auxiliary data of the two tracks at both ends are used. Restore to the auxiliary data restoration means 111.

[0099] As described above, according to the present embodiment, one video signal can be recorded in two types of formats even in a format in which the number of tracks for recording one frame is small.

[0100] One can configure a recording / playback device having excellent reliability and compatibility by recording on a relatively wide track, and the other can configure to achieve long-time recording.

[0101] As described above, according to the present invention, when reliability is required for the required image data, a normal track format is used, and when economy (recording cost) is required, a narrow track is used. The rationality of selecting a format can be realized with the same tape and one recording / playback device.

[0102] Although the present invention has been described only when the number of tracks is n = 40 and n = 10, the present invention is not limited to this, and compressed video data can be stored according to the degree of short wavelength recording in a narrow track. n-2) By selecting whether to record tracks or record n tracks, recording and playback can be performed in two recording formats without any problem.

[0103] Further, the present invention has been described only in the case of a broadcast VTR compliant with the SMPTE standard D-7 format, but the present invention is not limited thereto. The configuration of the recording head of a broadcast VTR is not limited to this.

Although the track pitches of the normal track format and the narrow track format have been described as 18 μm and 9 μm, the present invention is not limited to this, and any track pitch that can guarantee playability and editing functions may be used.

[0105] Further, when only economic efficiency (recording cost) is required in the realization of the invention, a recording / reproducing device using only the narrow track format is used. This makes it possible to reduce the equipment cost as compared with the case of supporting both formats. Similarly, it is conceivable to use a recording / playback device that records and reproduces a narrow track format and normally uses only reproduction as the track format. These are made possible by setting the recording format to the configuration of the present invention.

Further, although the present invention has been described only for video data, it is clear that the present invention can be applied to audio data and other cases, and the number of recorded tracks for a block of recorded data as a reference for editing. It is possible to deal with the case of n lines and by selecting (n-2) lines.

[Effect of the Invention] As described above, according to the present invention, it is possible to provide a recording / reproducing device capable of recording a video signal for a long time in a tape format that is not affected by editing work and corresponding to high-speed reproduction.

[0108] Further, two types of recording formats can be efficiently realized by one recording / playback device, and a recording method having excellent reliability and compatibility and a long-time recording method can be realized by using one type of tape. ..

BRIEF DESCRIPTION OF THE DRAWINGS [Fig. 1] A block diagram illustrating a recording / reproducing device of the present invention [Fig. 2] A diagram illustrating a head tape configuration of the recording / reproducing apparatus of the present invention [Fig. 3] Embodiment of the present invention. FIG. 4 for explaining the track format in FIG. 1 [Fig. 4] Fig. 5 for explaining the configuration of the sink block [Fig. 5] Fig. 6 for explaining a defect during editing [Fig. 6] The track format in the second embodiment of the present invention will be described. FIG. 7 is a diagram for explaining a recording method of a conventional VTR for broadcasting. FIG. 8 is a diagram for explaining a head tape configuration of the recording / playback device. FIG. 9 is a diagram for explaining a track format in the VTR for broadcasting. 10 Figure to explain problems during editing [Explanation of codes] 101, 102 A / D converter 103 Compression means 104 Format selection means 105 Auxiliary data generation means 106 Recording processing means 107 Recording amplifier 108 Recording head 109 Playback head 110 Playback Amplifier 111 Auxiliary data restoration means 112 Reproduction processing means 113 Compression / decoding means 114, 115 D / A converter