JPH09139019A - Magnetic tape data reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a VTR device of a nontracking system capable of multiple speed reproduction even while using general precision parts. SOLUTION: When a quadruple speed reproduction is performed by a reproducing part 50, a VTR tape 14 is traveled at a speed quadruple to that at the time of single speed reproduction, and a drum 220 is rotated at the same rotating speed as that at the time of the single speed reproduction, so that a helical track on the VTR tape 14 is traced by four sets of positive azimuth heads and negative azimuth heads respectively as four heads, eight heads of a reproducing head part 52 respectively. Recorded data is reproduced from the read-out recorded signal, and error detection is performed on the reproduced recorded data by inner code correction circuits 260 and 262 respectively, and then the recorded data having lower error rate is selected and outputted by nontracking processing circuits 280 and 282.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called non-tracking type magnetic tape data reproducing apparatus, and in particular, double speed reproduction for reproducing all data at a high speed and jog shuttle reproduction. A possible magnetic tape data reproducing device.

[0002]

2. Description of the Related Art On a video tape (VTR tape), audio / video data is recorded by alternately inverting the azimuth angles of adjacent helical tracks. If the azimuth angle is alternately inverted for each helical track in this way, even if the reproducing head scans (traces) a helical track having a different azimuth angle, the audio / video data cannot be reproduced. Further, even when the reproducing head traces a helical track having the same azimuth angle, if the reproducing head and the helical track are deviated from each other, many errors occur in the reproduced audio / video data.

A so-called non-tracking (N-tracking) that positively utilizes such a property relating to the azimuth angle of the reproducing head and the helical track at the time of reproducing the audio / video data.
An on-tracking type video device (VTR device) has been proposed. On the tape running surface of the drum of the non-tracking type VTR device, two reproducing heads (regular azimuth heads) having a regular azimuth angle are arranged at intervals of one helical track, and, for example, a regular azimuth head. Two reproducing heads (negative azimuth heads) having negative azimuth angles are arranged at positions symmetrical with respect to the center of rotation of the drum at intervals of one helical track.

In a non-tracking type VTR device, a total of four reproducing heads scan a helical track to read out audio / video data, and a reproducing head (a positive azimuth head or a negative azimuth head) whose azimuth angle coincides with that of the helical track. Of the two audio / video data reproduced by the head), the audio / video data with a lower error rate read by the reproducing head that accurately traces the helical track is selected and output. By adopting such a method, the non-tracking type VTR device is
The conditions for tracking control of the playback head for a helical track have been greatly relaxed.

Further, in a VTR device for a television broadcasting station or the like, audio / video data recorded on a VTR tape is doubled at 4 times the data rate (1 × speed) during normal reproduction.
There is a case where a double speed reproduction function for reproducing all audio / video data at a high data rate such as an integral multiple such as double, ..., or an arbitrary multiple such as 2.1 and 4.2. In order to realize a double speed reproduction function in a non-tracking type VTR device, a method of running a tape at a speed corresponding to a double speed reproduction magnification and rotating a drum at a rotation speed corresponding to a double speed reproduction magnification can be considered. .

However, when this method is adopted, the load on the motor for rotating the drum becomes large, and moreover, the VT such as the contact accuracy between the tape running surface of the drum and the VTR tape is increased.
High precision is required for the R device in terms of mechanism, which is difficult to realize. Further, if this method is adopted, the frequency of the audio / video data (recording signal) read from the VTR tape becomes high, and the operating frequency of the recording signal equalization processing circuit becomes high. In addition, processing such as error correction for audio / video data reproduced from the recorded signal is accelerated, which is difficult to realize in terms of hardware and software.

The present invention has been made in view of the above-mentioned problems of the prior art, and is of a non-tracking type capable of double-speed reproduction while using mechanical parts having the same accuracy as a VTR device which performs single-speed reproduction. It is an object to provide a magnetic tape data reproducing device (VTR device). Another object of the present invention is to provide a non-tracking type magnetic tape data reproducing apparatus capable of double speed reproduction without using a special high speed operation component in an equalization processing circuit or an error correction processing circuit. To do. Another object of the present invention is to provide a magnetic tape data reproducing apparatus which utilizes the components used to realize double speed reproduction and improves the performance of other special reproduction processing functions, for example, the jog shuttle reproduction function. To do.

[0008]

In order to achieve the above object, a magnetic tape data reproducing apparatus according to the present invention comprises a rotating drum and n (n ≧ n) arranged on the outer peripheral surface of the rotating drum.
The recording data recorded on the helical track of the tape recording medium is alternately recorded at the first azimuth angle and the second azimuth angle. A magnetic tape data reproducing device for reproducing the recorded data using identification data indicating the order of the recorded data, wherein the rotating drum rotates at a constant rotation speed, and the n sets of data read head means are provided with the helical track. And each of the n data reading head means scans the helical track with the first azimuth angle and the one spaced apart to read the recording data and the identification data. Two first playheads,
The second helical track provided with the second azimuth angle, and the second second track that scans the helical track with a space between them to read the recording data and the identification data.
Reproducing head, and the data reproducing means is
Error detection means for detecting an error in each of the identification data and the recording data read by each of the data reading head means, and the error having the minimum error among the recording data read by each of the n data reading head means. Data selection means for selecting each recording data,
The recording data selected based on the identification data corresponding to each of the selected recording data is arranged in a recording order and is output.

Preferably, the data reproducing means is the n
A plurality of error detecting means which are provided corresponding to each of the data read head means or each of the portions, and which detect an error in each of the recording data read by the corresponding data read head means, and the n data read operations. A plurality of data selecting means which is provided corresponding to each head means or each part, and selects the recording data with the smallest error among the recording data in which the corresponding error detecting means has detected an error. The data arranging means arranges the recording data selected by each of the n data selecting means in the recording order based on the corresponding identification data, and outputs the recording data.

Preferably, the tape recording medium is m times (2.ltoreq.2.ltoreq.) The running speed at the time of reproducing the recorded data at 1 × speed.
| M | ≦ n) times the traveling speed, and the rotating drum rotates at a rotational speed corresponding to the traveling speed of the tape recording medium when the recorded data is reproduced at 1 × speed, Data reading head means for scanning the helical track, and the n data reading head means for scanning the helical track read the recording data and the identification data from each of the scanned helical tracks, and the data reproducing means , The recording data read by m of the n data reading head means are arranged in the order of recording based on the corresponding identification data, and the recording data is output at m times speed.

[0011] Preferably, the recording data is audio / video data, and the tape recording medium travels at a traveling speed different from a traveling speed at the time of reproducing the audio / video data at a single speed, and the tape is rotated. The drum is rotated at a rotation speed corresponding to the running speed of the tape recording medium to cause all or part of the n data read head means to scan the helical track, and the data read to scan the helical track. Each head means reads the audio / video data and the identification data from each scanned helical track, and the data reproducing means buffers and outputs the audio / video data arranged in the order of recording. The data read head means for scanning the helical track, further comprising ring means. Sequentially the audio and video data read, perform jog shuttle reproduction and output.

In the VTR device (magnetic tape data reproducing device) according to the present invention, an interval for one helical track is provided on the tape running surface of the drum (rotating drum) at positions symmetrical with respect to the center of rotation of the rotating drum. Two reproducing heads each having a positive azimuth angle (first azimuth angle) (positive azimuth head; first reproducing head) and a reproducing head having a negative azimuth angle (second azimuth angle) (negative) An n (for example, n = 4) data reading head means having an azimuth head; a second reproducing head, scans a helical track in which the azimuth angle of the tape recording medium (VTR tape) is alternately inverted.

Further, in the magnetic tape data reproducing apparatus according to the present invention, among these 4 × 4 (4 × n) reproducing heads,
8 (2 × n) reproducing heads (first reproducing head or second reproducing head) having the same azimuth angle were reproduced.
The audio / video data is reproduced by a so-called non-tracking method by selecting and outputting one of the (2 × n) recorded data (audio / video data) with less error.

The rotating drum rotates at the same rotation speed as that of the 1 × speed reproduction even when the 2 × speed reproduction, for example, the 2 × speed reproduction is performed,
The 4 (n) data read head means is caused to scan all the helical tracks of the tape recording medium. On the tape recording medium, identification data indicating the order of the audio / video data is recorded together with the audio / video data, and four data read head means for scanning the helical track are four, and a total of 4 × 2. Read voice / data and identification data.

The error detecting means of the data reproducing means uses, for example, an error correction code added to the audio / video data, and one of the four reproducing heads makes the azimuth angle equal to the helical track being scanned. Then, the error of the 4 × 2 audio / video data read by each of the two data read head means accurately tracing the helical track is detected.

The data selecting means selects the audio / video data with the smallest error among the four audio / video data read by each of the two data reading head means, and the azimuth angle is matched, so that the helical track is accurately recorded. Traced playhead (2 first playheads or 2
Audio read by one of the second playback heads
Select as video data. In other words, the data selecting means selects, out of the 4 × 2 audio / video data read by the two data reading head means, two data corresponding to each of the two data reading head means. The data arranging means stores the selected two audio / video data,
Arrange in the order of recording based on the corresponding identification data,
Output.

When the magnetic tape data reproducing apparatus according to the present invention carries out quadruple speed reproduction, the tape recording medium is made to run at a speed four times as high as that in the case of the one-time speed reproduction, and the four data reading head means described above are used. Audio / video data is read out by using all of the data, and 4 corresponding to each of the four data read head means from the read 4 × 4 audio / video data.
Selects one audio / video data and outputs it in the order of recording.

When the magnetic tape data reproducing apparatus according to the present invention carries out 1 × speed reproduction, the tape recording medium is run at the speed of 1 × speed reproduction, and one of the four data read head means is used. The audio / video data is read out by using each one, and one audio / video data is selected from the read out four audio / video data, and is arranged and output in the order of recording.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Hereinafter, embodiments of the present invention will be described. FIG. 1 shows a digital video device (V of the first embodiment according to the present invention.
FIG. 3 is a diagram showing a configuration of a TR device) 1. As shown in FIG. 1, the VTR device 1 includes a recording unit 10, a reproducing unit 20, and a tape running unit 16. The recording unit 10 includes a video data compression circuit (Bit-Rate Reduction ENCODE) 100, a data packing circuit (Data Packing) 102, an outer code encoder circuit (ECC OUTER ENCODER) 104, and a memory circuit 1.
06, inner code encoder circuit (ECC INNNER ENCODER) 10
8 and the recording head unit 12.

The reproducing section 20 includes a reproducing head section 22, an equalizing section 24, an inner code correcting section (ECC INNER CORRECTION) 26, a non-tracking processing section (Non-Tracking) 28, and a memory section 3.
0, outer code correction unit (ECC OUTER CORRECTION) 32, data depacking unit (Data Depacking) 34, jog memory unit 36, data decimation circuit (RATE decimation) 38, and video data decompression circuit (Bit-Rate Reduction DECODE) 40 Composed of.

The tape running portion 16 includes a drum motor, a capstan motor, a drive circuit for these motors, and the like.
Including a component for running the TR tape 14, V
The TR tape 14 is run, and the two sets of reproducing heads of the reproducing head unit 22 are caused to scan the helical track (FIG. 4B) of the VTR tape 14. The tape running unit 16
Even when the playback unit 20 of the VTR device 1 performs double speed playback such as double speed playback, the VTR tape 14 is played at the same speed as the single speed playback.
To run. In addition, the drum 220 of the recording head unit 12
The drum 220 of the reproducing head unit 22 is actually the same.

With these components, the VTR device 1 compresses and encodes the video data VIN and the audio data AIN input from the outside by a compression encoding method such as the MPEG method to generate the recording data, and the video tape. (VTR tape) 14 is recorded. Further, the VTR device 1 reproduces the record data recorded on the VTR tape 14 by a non-tracking method, expands and decodes it, and outputs it as video data VOUT and audio data AOUT.

Each component of the recording unit 10 (FIG. 1) will be described below. The video data compression circuit 100 is used for the uncompressed video data VI input from an externally connected editing device or the like.
N is a GOP (GROUP OF PICU
RE) is compressed and encoded by the MPEG system, and is output to the data packing circuit 102 as compressed video data having a data rate of Nbps.

FIG. 2 is a diagram showing the structure of a sync block of audio / video data to be recorded on the VTR tape 14 shown in FIG. 1. FIG. 2A shows the data packing circuit 102 shown in FIG. Audio / video data (VIDEO / AUDIO
DATA) shows the structure of the synchronization block after adding the synchronization data SYNC, the identification data ID, the outer code (OUTER PARITY) and the inner code (INNER PARITY), and (B) shows the synchronization block shown in (A). 2 shows the data structure in the horizontal direction (line; SYNC block).

The data packing circuit 102 (FIG. 1) is
Compressed video data of the data rate Nbps input from the video data compression circuit 100 and uncompressed audio data AOUT input from the outside are assembled in GOP units, and the audio in the synchronization block shown in FIG. -Generate video data (VIDEO / AUDIO DATA) and output it to the outer code encoder circuit 104.

The outer code encoder circuit 104 stores the input audio / video data in the memory circuit 106, generates the external code shown in FIG. 2A for the audio / video data, and adds it to the audio / video data. And outputs to the inner code encoder circuit 108. Inner code encoder circuit 108
Is the highest error in the audio / video data to which the outer code is added, for each GOP, with the inner code and outer code (generally referred to as the product code, which is the combination of the inner code and outer code shown in FIG. 2A). Interleaved to show the correction capability and shown in FIG.
The inner codes shown in (A) and (B) are generated and added.

Further, the inner code encoder circuit 108 is
2 bytes of synchronization data SYNC and 4 bytes of identification data ID (FIGS. 2A and 2B) are generated, and
The recording data of the synchronous block having the configuration shown in (1) is generated and output to the recording head unit 12. FIG. 3 is a diagram showing a data structure of the identification data ID shown in FIG.
2A corresponds to FIG. 2B and shows the data structure of each line (SYNC block) of the recording format.
(B) shows the structure of the identification data ID shown in (A). As shown in FIG. 3B, a helical track in which the line (SYNC block) is recorded in the first byte (ID0) of the identification data ID (FIG. 4B).
Sync Block ID that indicates the order in
Enters.

The second byte (ID
Audio / video data ID in the most significant bit (MSB) of 1)
(VIDEO / AUDEIO ID) is entered and the 3rd bit to the least significant bit
A track ID (TRACK ID) is entered in (LSB). The audio / video data ID is the data area (DATA; audio / video data shown in FIG. 2A) of the line (SYNC block).
Indicates whether the data contained in (VIDEO / AUDIO DATA) or outer code (OUTER PARITY) is audio data or video data. The track ID is a helical track in which the line (SYNC block) is recorded. (Fig. 4
(B)) Shows the order for each GOP.

The third byte (ID
2) and the 1st bit and the least significant bit of the 4th byte (ID3), the history ID (HISTORICAL ID) voice,
The video data ID (VIDEO / AUDEIO ID) is entered, and the cyclic I is set in the 4th bit to the 2nd bit of the 4th byte.
Enter D (CYCLIC ID). The history ID (HISTORICAL ID) is
A history of processing such as editing added to the recorded data is shown. The cyclic ID is incremented in GOP units,
The order of audio / video data for each 8 GOP is shown.

The recording head unit 12 has two recording heads, modulates the recording data generated by the inner code encoder circuit 108 to generate a recording signal, and J (= R × (L + N) per recording head. ), R are recorded on the VTR tape 14 at a data rate of redundancy based on addition of the product code and the synchronization data SYNC).

FIG. 4 shows recording data (recording signal; FIG. 2).
It is a figure which shows the recording format at the time of recording (A)) on the VTR tape 14 (FIG. 1). As shown in FIG. 4A, the recording data is recorded in GOP units over a plurality of helical tracks, and as shown in FIGS. 4B and 4C, a plurality of helical tracks are recorded in each helical track. Line (SYNC
Block) is recorded.

The structure of the reproducing section 20 (FIG. 1) will be described below. The equalizer 24 equalizes the recording signals read by each of the two sets of read heads of the read head unit 22 (one set of read heads has two positive azimuth heads and two negative azimuth heads), and records the read signals. Data (Figure 2 (A))
Is reproduced and output to the inner code correction unit 26.

Here, among the total of eight reproducing heads (four positive azimuth heads and four negative azimuth heads) of the reproducing head section 22, the VTR tape 14 and the azimuth angle are the same, and the VTR tape is correct. Only the reproducing head tracing 14 helical tracks (FIG. 4B) can correctly read the recording signal. In addition, the data rate of the record data reproduced by the equalization unit 24 is 8 Jbps as a whole when quadruple speed reproduction is performed.

The inner code correction unit 26 performs error detection and error correction processing using the inner code (FIG. 2A) on the recording data input from the equalization unit 24, and the non-tracking processing unit 28. Output to. Here, the recording head unit 1
The data rate when the recording data is written in the VTR tape 14 by the No. 2 is Jbps as described above. When the recorded data is reproduced at 4 × speed, the data rate of the recorded data read by the reproducing head unit 22 becomes 8 Jbps.

The non-tracking processing unit 28 selects the data with the fewest errors from the recording data input from the inner code correction unit 26 and stores it in the memory unit 30 in units of lines (SYNC blocks). The non-tracking processing unit 28 arranges the recording data stored in the memory unit 30 into an array suitable for the processing of the outer code correction unit 32 (performs deinterleaving processing corresponding to the interleaving processing in the inner code encoder circuit 108 (FIG. 1)). ), The outer code correction unit 32
Output to

The outer code correction unit 32 performs error correction on the recorded data by using the outer code (FIG. 2A) included in the recorded data input from the non-tracking processing unit 28, and outputs the data data. Output to the packing unit 34. The data depacking unit 34 separates the audio / video data, the identification data ID and the like (FIG. 2B) from the input recording data, and outputs them to the external and data thinning circuits 38.

The data decimation circuit 38 decimates the video data and the audio data from the audio / video data input from the data depacking unit 34, outputs the audio data AOUT to the outside, and decompresses the video data into the video data expansion circuit. Four
Output for 0. The data thinning circuit 38 is, for example, V
When the TR device 1 is reproducing at 4 × speed, one frame of data is taken out for every four frames of data,
For example, it is used to generate audio / video data having the same data rate as 1 × speed reproduction suitable for display on a monitor device. The video data expansion circuit 40 expands and decodes the video data input from the data thinning circuit 38 by an expansion decoding method corresponding to the compression encoding method of the video data compression circuit 100, and outputs it as the video data VOUT to the outside.

The recording operation of the VTR device 1 will be described below. In the recording unit 10, the video data compression circuit 100
Indicates that the video data VIN is, for example, a G frame with two frames.
It is compression-encoded by the MPEG method so as to form the OP.
The data packing circuit 102 is the video data compression circuit 1.
The compressed video data input from 00 and the uncompressed audio data AOUT input from the outside are assembled in GOP units to generate audio / video data (FIG. 2A).

The outer code encoder circuit 104 stores the input audio / video data in the memory circuit 106, and generates and adds the external code (FIG. 2A) to the recorded audio / video data. The inner code encoder circuit 108 interleaves the audio / video data to which the outer code is added, generates and adds the inner code (FIGS. 2A and 2B),
Furthermore, the synchronization data SYNC and the identification data ID (FIGS. 2A and 2B) are added to the synchronization block (FIG. 4).
The record data assembled in (A)) is generated. The recording head unit 12 modulates recording data to generate a recording signal,
Record on VTR tape 14.

FIG. 4 shows recording data (recording signal; FIG.
It is a figure which shows the recording format at the time of recording (A)) on the VTR tape 14 (FIG. 1). As shown in FIG. 4A, the recording data is recorded in GOP units over a plurality of helical tracks, and as shown in FIGS. 4B and 4C, a plurality of helical tracks are recorded in each helical track. Line (SYNC
Block) is recorded.

The reproducing operation of the VTR device 1 will be described below. The equalization unit 24 equalizes the recording signals read from the VTR tape 14 by the two sets of reproducing heads of the reproducing head unit 22, and reproduces the recording data (FIG. 2A). The inner code correction unit 26 performs error detection and error correction processing on the reproduced record data using the inner code (FIG. 2A), and outputs it to the non-tracking processing unit 28. The non-tracking processing unit 28 selects the data with the fewest errors from the error-detected and error-corrected recording data, stores it in the memory unit 30 in line units, and further performs deinterleaving processing.

The outer code correction unit 32 performs error correction on the recorded data by using the outer code (FIG. 2A) included in the recorded data input from the non-tracking processing unit 28. The data depacking unit 34 separates audio / video data, identification data ID and the like (FIG. 2B) from the error-corrected recording data. Data thinning circuit 3
Reference numeral 8 thins out the audio / video data to generate audio / video data suitable for display on the monitor device. The video data expansion circuit 40 expands and decodes the video data input from the data thinning circuit 38, and outputs it as video data VOUT to the outside.

As described above, according to the VTR device 1 of the present invention, the recording data (audio / video data) recorded on the VTR tape 14 can be reproduced by the non-tracking method. When the audio / video data is played back by the non-tracking method, the condition relating to the tracking servo control is relaxed, so in addition to double-speed playback of integer times such as 2 times, 4 times, etc., an arbitrary magnification such as 2.1 times It is possible to play back at double speed.

In the first embodiment, the case where the azimuth angle is positive, negative, or binary has been described. However, for example, the number of azimuth angles is further increased, and the azimuth angles of the recording head unit 12 and the reproducing head unit 22 are increased. It is also possible to provide a reproducing head corresponding to each corner to reproduce audio / video data. Further, the positional relationship between the positive azimuth head and the negative azimuth head of the reproducing head unit 22 does not necessarily have to be symmetrical with respect to the rotation center of the drum 220.

Second Embodiment The second embodiment will be described below. In the reproducing unit 20 of the VTR device 1 (FIG. 1) shown in the first embodiment, the magnification of the double speed reproduction is limited by the operating speed of each component of the reproducing unit 20, and, for example, each component of the reproducing unit 20. If the operation speed of 2 can handle only the processing related to the double speed reproduction, the reproducing unit 20 cannot perform high speed reproduction with a magnification higher than double. Second
The reproducing unit 50 shown in the embodiment of the present invention uses V instead of the reproducing unit 20.
It is used in the TR device 1 and aims to perform high-speed reproduction up to n-times speed reproduction while suppressing the rotation speed of the drum 220 to be the same as during 1-times speed reproduction.

FIG. 5 is a diagram showing the structure of the reproducing section 50 according to the present invention in the second embodiment. As shown in FIG. 5, in the second embodiment, four equalization circuits 24 are provided.
0, 242, 244, and 246 correspond to the equalizer 24 (FIG. 1). The equalization circuits 240, 242, 244, 24
Reference numerals 6 respectively have two circuits for two sets of a positive azimuth head and a negative azimuth head (which will be described later with reference to FIG. 6) of the reproducing head section 52, and the equalizing section 24 has an eight-circuit configuration as a whole. Incidentally, the reproducing heads 224, 226, 22
The 8,230 positive azimuth heads and negative azimuth heads are collectively referred to simply as "reproducing heads".

Although the reproducing head section 52 has a total of 16 reproducing heads, the positive azimuth head and the negative azimuth head are arranged at symmetrical positions (shifted by 180 °) with respect to the rotation center of the drum 220. In addition, since the VTR tape 14 is wound around the drum 220 for only a half round, eight circuits are alternately used every half round of the drum 220 to accommodate 16 reproducing heads, thereby increasing the circuit scale. Hold down.

Inner code correction circuit 260 corresponding to the equalization circuits 240 and 242, an inner code correction circuit 262 corresponding to the equalization circuits 244 and 246, and a time-sharing buffer (Data distribution; BD circuit) )
H.264 and FIFO circuits (D1, D2) 266, 26
Reference numeral 8 corresponds to the inner code correction unit 26 (FIG. 1).

The non-tracking processing circuits 280 and 282 corresponding to the FIFO circuits 266 and 268 correspond to the non-tracking processing unit 28 (FIG. 1). FIF
Memory circuit 3 corresponding to each of the O circuits 266 and 268
00 and 302 correspond to the memory unit 30 (FIG. 1). The outer code correction circuits 320 and 322 corresponding to the non-tracking processing circuits 280 and 282 respectively include the outer code correction unit 3
2 (FIG. 1).

Data depacking circuits 340 and 342 and FI corresponding to the outer code correction circuits 320 and 322, respectively.
The FO circuits (Q1, Q2) 344, 346 and the data recombination circuit (DR; Data recombine) 348 correspond to the data depacking unit 34 (FIG. 1). The jog memory circuits 360 and 362 corresponding to the data depacking circuits 340 and 342 are the jog memory units 36 (FIG. 1).
Corresponding to

The non-tracking processing circuit 280, the memory circuit 300, the outer code correction circuit 320, the data depacking circuit 340, and the jog memory circuit 360, as indicated by the dotted line in FIG. 42
The non-tracking processing circuit 282, the memory circuit 302, the outer code correction circuit 322, the data depacking circuit 342, and the jog memory circuit 362 configure the second signal processing unit 44. The signal processing systems 42 and 44 are
It is configured to process the recorded data in parallel.

FIG. 6 shows the reproducing head section 52 shown in FIG.
The configuration is illustrated for the case of the number of reproducing heads n (n = 4)
FIG. Playback head for non-tracking system
52 (FIG. 5), as shown in FIG.
Helical of VTR tape 14 on the tape running surface of 20
Two positive azimuth angles with one rack spacing
Playback head (positive azimuth head) a₁₁, A
₁₂(A₁), A_{twenty one}, A_{twenty two}(A_Two), A₃₁, A
₃₂(A_Three), A₄₁, A ₄₂(A_Four) And positive azimuth angle reproduction
Head A₁~ A_FourEach with, for example, the drum 220
One helical track at a position symmetrical to the center of rotation
Two negative azimuth angle playback heads at intervals of minutes
(Negative azimuth head) b₁₁, B₁₂(B₁), B_{twenty one}, B_{twenty two}
(B_Two), B₃₁, B₃₂(B_Three), B₄₁, B₄₂(B_Four)When
N (n ≧ 1) reproducing heads 224 each having
226, 228 and 230 are arranged.

The non-tracking system scans (traces) the total 16 audio / video data read from the VTR tape 14 by each of the four reproducing heads 224, 226, 228 and 230. Playback to the helical track by selecting and outputting audio / video data with a lower error rate read by the playback head that accurately traces the helical track of the VTR tape 14 and the azimuth angle matches. The head tracking control is substantially unnecessary.

Hereinafter, the reproducing section 50 in the second embodiment.
The configuration of (FIG. 5) will be described. Equalization circuits 240, 242,
244 and 246 (equalization unit 24) include the reproduction heads 224 and
226, 228, 230 positive azimuth heads A _{1 to} A ₄
And the negative azimuth heads B _{1 to} B ₄ (FIG. 6) are equalized with respect to the recording signals read out, and the recording data (FIG.
(A) is reproduced and output to the inner code correction unit 26.

Here, as described above, the positive azimuth heads A _{1 to} A ₄ and the negative azimuth head B of the drum 220 are used.
_{Among 1 to} B ₄ , only the reproducing head which has the same azimuth angle as the VTR tape 14 and traces the helical track (FIG. 4B) of the VTR tape 14 correctly can correctly read the recording signal. .

The inner code correction circuits 260 and 262 (inner code correction unit 26) at least independently record data reproduced at double speed, that is, record data having a data rate twice the data rate at the time of single speed reproduction. Has a performance capable of performing error correction processing using an internal code. The recording data input from the reproducing heads 224, 226 and the reproducing heads 228, 230 are processed in parallel for 8 bits, respectively. Error detection and error correction processing using the code (FIG. 2A) is performed and output to the BD circuit 264.

The BD circuit 264 is an inner code correction circuit 26.
The recording data input from 0, 262 is buffered, the routing is changed according to the processing, and the data is output to the FIFO circuits 266, 268. In addition, the BD circuit 26
Reference numeral 4 controls the buffering operation of the FIFO circuits 266 and 268 via the control signals a ₂ and b ₂ .

The FIFO circuits 266 and 268 are respectively
The recording data input from the BD circuit 264 is buffered under the control of the BD circuit 264 and output to the non-tracking processing circuits 280 and 282, respectively. The non-tracking processing circuits 280 and 282 (non-tracking processing unit 28) are respectively provided with the inner code correction circuit 2
Of the recording data input from 60 and 262,
Select the data with the fewest errors and select the line (SYNC
The data is stored in the memory circuits 300 and 302 in units of blocks.

Non-tracking processing circuits 280, 282
Each of them further arranges the recording data stored in the memory circuits 300 and 302 into an array suitable for the processing of the outer code correction circuits 320 and 322 (the deinterleaving processing corresponding to the interleaving processing in the inner code encoder circuit 108 (FIG. 1) is performed). Output) to the outer code correction circuits 320 and 322, respectively.

The outer code correction circuits 320 and 322 use the outer code (FIG. 2A) included in the recording data input from the non-tracking processing circuits 280 and 282, respectively, to detect and detect an error in the recording data. It performs error correction and outputs it to the data depacking circuits 340 and 342.

The data depacking circuits 340 and 342 respectively separate the audio / video data and the identification data ID (FIG. 2B) from the input recording data, and the identification data is sent to the data recombining circuit 348. The audio / video data is output to the FIFO circuits 344 and 346 (depacking processing). FIFO circuit 3
44 and 346 respectively include the data depacking circuit 34.
The audio / video data input from each of 0 and 342 are buffered and output to the data recombining circuit 348.

The data recombining circuit 348 receives the identification data I input from the data depacking circuits 340 and 342.
Using the cyclic ID of D, the FIFO circuit 344,
The order of the audio / video data input from 346 is returned to the original order (in the order of recording), and output to the data thinning circuit 38 (data recombining process). The configurations and operations of the data thinning circuit 38 and the video data decompression circuit 40 are as follows.
Is as described in the embodiment.

The operation of the reproducing section 50 will be described below. Operation at 4 × Speed Playback First, the playback unit 50 is the recording unit 1 of the VTR device 1 (FIG. 1).
The operation of reproducing the recording data (recording signal) recorded on the VTR tape 14 by 0 at 4 × speed will be described.
FIG. 7 is a timing chart showing the operation timing of each component of the reproducing section 50 shown in FIG. 5, in which (A) shows a recording signal reproduced from the VTR tape 14 (FIG. 1) as G
Shown in OP units, (B) shows an NT pulse signal indicating the boundary of GOP of the recording signal shown in (A), and (C) shows B.
The D circuit 264 shows the timing for resetting the FIFO circuit 266, and (D) shows W that defines the timing for the BD circuit 264 to write the recording data in the FIFO circuit 266.
The RA signal (control signal a ₂ ) is shown, (E) shows the timing at which the non-tracking processing circuit 280 reads the recording data from the FIFO circuit 266, and (F) shows the BD circuit 2.
64 indicates the timing for resetting the FIFO circuit 268, (G) indicates the WRB signal (control signal b ₂ ) that defines the timing for the BD circuit 264 to write the recording data in the FIFO circuit 268, and (H) indicates the non-tracking process. The circuit 282 shows the timing of reading the print data from the FIFO circuit 268, (I) shows the print data output from the non-tracking processing circuit 280, and (J).
Indicates the timing at which recording data is output from the non-tracking processing circuit 280, (K) indicates the recording data output from the non-tracking processing circuit 282,
(L) shows the timing at which the recording data is output from the non-tracking processing circuit 282, (M) shows a synchronization signal that defines the timing at which the outer code correction circuits 320 and 322 output the recording data, and (N) shows. Outer code correction circuit 3
20 shows the recording data output from 20 and (O) shows the recording data output from the outer code correction circuit 322,
(P) shows audio / video data output by the data recombining circuit 348. In FIG. 7, * indicates negative logic.

The tape running unit 16 runs the VTR tape 14 at a speed four times as fast as that at the time of 1x speed reproduction, and the drum 220
Rotates at the same rotation speed as in the 1 × speed reproduction, and each of the reproduction heads 224, 226, 228 and 230 has four sets, eight positive azimuth heads and four sets, and eight sets.
The negative azimuth head traces the helical track of the VTR tape 14 (FIG. 4B). As shown in FIG. 7A, the reproducing heads 224, 226, 228, 23
Zero positive and negative azimuth heads (Fig. 6)
The data rates of the recording signals (recording data) read out from the VTR tape 14 gradually increase for a while after the start of running and the rotation of the drum 220, and each of them reaches a target speed and becomes constant.

Equalization circuits 240, 242, 244, 246
Performs equalization processing on the read recording signal and reproduces the recording data. The inner code correction circuits 260 and 262 generate the NT pulse signal (FIG. 7B) indicating the boundary of the GOP of the recording data based on the reproduced recording data. Each component after the inner code correction circuits 260, 262 is
Processing is performed in synchronization with the pulse signal.

Further, inner code correction circuits 260, 262
Performs an error detection process and an error correction process using an inner code on the reproduced record data. BD circuit 264
Buffers the record data for which error detection or the like has been performed, and the cyclic ID included in the record data (see FIG.
When (B)) is an even number, the print data is written in the FIFO circuit 266 at the timing shown in FIG.
If it is an odd number, as shown in FIG. 7C, the FIFO circuit 266 is reset at the rising point of the NT pulse.

Further, the BD circuit 264 buffers the record data for which error detection or the like has been performed, and when the cyclic ID included in the record data is an odd number, FIG.
The recording data is written to the FIFO circuit 268 at the timing shown in (G), and when the recording data is even, as shown in FIG.
68 is reset.

That is, the BD circuit 264 causes the FIFO circuits 266 and 268 to alternately buffer the recording data depending on whether the cyclic ID included in the recording data is odd or even. In the BD circuit 264, since there is a possibility that the recording data of 4 Gbps may be continuously output from _one of the output terminals a ₁ and b ₁ to one of the FIFO circuits 266 and 268, the maximum data rate is 8 Gbps. Become.

Non-tracking processing circuits 280, 282
Are F at the timings shown in FIGS. 7E and 7H, respectively.
The recording data is alternately read from the IFO circuits 266 and 268 and buffered, and the recording data having a low error rate is selected. Since the print data is alternately read from the FIFO circuits 266 and 268, the FIFO circuits 266 and 26 are
The data rate of the recording data read from the No. 8 to the non-tracking processing circuits 280 and 282 is 4 Gbps.

Non-tracking processing circuits 280, 282
Are respectively the inner code correction circuit 26 of the inner code correction unit 26.
Of the recording data input from 0 and 262, the data with the fewest errors is selected and stored in each of the memory circuits 300 and 302 (non-tracking processing) in line (SYNC block) units, and further deinterleaved. Processing is performed and the deinterleaved recording data is output to the outer code correction circuits 320 and 322 at the timings shown in FIGS. 7 (J) and (L) (FIG. 7 (I),
(K)). Non-tracking processing circuit 280, 282
Selects and outputs two out of the four input recording data, the non-tracking processing circuits 280 and 28
2 and the outer code correction circuits 320 and 322 have a data rate of 2 Gbps.

The outer code correction circuits 320 and 322 apply outer codes (see FIG. 2) to the deinterleaved recording data.
An error correction process using (A)) is performed. The outer code correction circuits 320 and 322 remove the redundant portion of the recording data, and the data rate between the outer code correction circuits 320 and 322 and the data depacking circuits 340 and 342 is 2 ×.
(N + L) bps.

Data depacking circuits 340 and 342
Separates audio / video data and the like from the recorded data, and identifies data (Odd ID, Even ID) to the data recombining circuit 348 and audio / video data to the FIFO circuits 344 and 346.
Output to In addition, if necessary, the data depacking circuits 340 and 342 are connected to the jog memory circuit 360 and
Using the 362, a jog shuttle regeneration process is also performed. F
Each of the IFO circuits 344 and 346 receives the audio data input from each of the data depacking circuits 340 and 342.
The video data is buffered and output to the data recombining circuit 348 in synchronization with the sync signal shown in FIG. 7 (M) (FIG. 7 (N), (O)).

The data recombining circuit 348 uses the cyclic ID of the input identification data ID to restore the order of the audio / video data to the order at the time of recording, and the data recombination circuit 4 at the time of 1 × speed reproduction.
The data is output to the external and data thinning circuit 38 at the double data rate (FIG. 7 (P)). The data thinning circuit 38
The input audio / video data is thinned out at a rate according to the magnification of the double speed reproduction, the audio data AOUT is output to the outside, and the video data is output to the video data expansion circuit 40. In the case of 4 × speed reproduction, the data thinning circuit 38 thins out 3/4 of the input audio / video data to generate audio / video data having the same data rate as that in 1 × speed reproduction. To do. Video data expansion circuit 4
0 decompresses and decodes video data to generate video data VOUT, which is output to the outside.

The operation speed in the case of performing the 4 × speed reproduction in the reproducing section 50 having the respective constituent parts arranged in parallel will be further described. FIG. 8 is a diagram showing the relationship between the overhead related to non-tracking processing and the bus bandwidth,
(A) is an overhead related to non-tracking processing in the bus bandwidth between the non-tracking processing section 28 of the reproducing section 20 and the memory section 30 shown in FIG. 1, and recording from the memory section 30 to the outer code correcting section 32. 5B shows the relationship with the bus bandwidth that can be used for reading data. FIG. 5B shows the non-tracking processing circuit 280 of the reproducing unit 50 shown in FIG.
282 and the overhead related to the non-tracking processing in the bus bandwidth between the memory circuits 300 and 302, and the outer code correction circuit 32 from the memory circuits 300 and 302.
The relationship with the bus bandwidth that can be used for reading recorded data to 0,322 is shown.

The data rate when the recording head unit 12 writes the recording data on the VTR tape 14 is Jbps as described above. When attempting to reproduce the recorded data at 4 × speed, the data rate of the recorded data read by the reproducing head unit 52 becomes 8 Jbps.

On the other hand, the circuit for performing error detection and error correction by the inner code is divided into two systems, inner code correction circuits 260 and 262, and further, inner code correction circuits 260 and 26.
2 performs 8-bit parallel processing, and thus the inner code correction circuit 2
The operating frequency of 60, 262 is 4 × J / 8 Hz.

For example, when J is 50 (50 Mbps), the operating frequencies of the inner code correction circuits 260 and 262 are 4 × J / 8 = 25 MHz, and the configuration of the reproducing section 20 shown in the first embodiment. The operating frequency is lower than the operating frequency (50 MHz) when (FIG. 1) is adopted. Therefore, when the configuration (FIG. 5) shown in the second embodiment is adopted, the inner code correction circuits 260 and 262 and other components are
For example, it can be constructed by using a normal CMOS logic element, and it can be seen that the use of a special high speed operation component is unnecessary.

Further, the non-tracking processing circuit 280,
The operating frequency of 282 is 25 MHz under the above conditions.
Becomes In addition, the non-tracking processing circuits 280, 28
The transfer frequency of the recording data between the memory 2 and the memory circuits 300 and 302 is suppressed to as low as 12.5 MHz (when 8 bits are parallel).

Non-tracking processing circuits 280, 282
The bus bandwidth of the data bus between the memory circuit 300 and 302 is set to, for example, a very common value of 75 MHz (75
MBps), the bus bandwidth required for writing the record data to the memory circuits 300 and 302 is 25M.
By subtracting Hz, the bus bandwidth that can be used to read the recorded data from the memory circuits 300 and 302 to the outer code correction circuits 320 and 322 becomes 50 MHz.

Further, as described above, the non-tracking processing circuits 280 and 282 and the memory circuits 300 and 302.
The overhead related to the non-tracking processing of the bus bandwidth between the memory circuit 300,
From 302, it can be seen that data transmission (OUTER READ) to the outer code correction circuits 320 and 322 is possible in a very short time (FIG. 8B).

On the other hand, in the case of the configuration of the reproducing section 20 (FIG. 1), the overhead related to the non-tracking processing of the bus bandwidth between the non-tracking processing section 28 and the memory section 30 is 25 MHz, and the memory section Data transmission (OUTER READ) from 30 to the outer code correction unit 32 takes time (FIG. 8A).

FIG. 9 is a diagram showing the relationship between the overhead related to the non-tracking processing, the processing capacity required for the components performing the non-tracking processing, and the bus bandwidth. FIG. 9A is shown in FIG. The relationship between the overhead related to the non-tracking processing in the bus bandwidth between the non-tracking processing unit 28 of the reproducing unit 20 and the memory unit 30 and the processing capacity required for the non-tracking processing unit 28 is shown (B). Is a non-tracking processing circuit 280, 282 of the reproducing unit 50 and a memory circuit 300 shown in FIG.
The relationship between the overhead related to the non-tracking processing in the bus bandwidth with the communication path 302 and the processing capacity required for the non-tracking processing circuits 280 and 282 is shown.

In the reproducing section 50, the memory circuit 30
1GO from the 0, 302 to the outer code correction circuits 320, 322
The time for transferring the data for P is 1/4 (= 1 of the time T (GOP time) required for processing the recording data for 1 GOP).
2.5 MHz / 50 MHz), the processing capability A of the non-tracking processing circuits 280 and 282 can be relatively small (FIG. 9 (B)).

On the other hand, in the reproducing section 20 (FIG. 1), the time for transferring 1 GOP worth of data from the memory section 30 to the outer code correcting section 32 is the time T (GOP time) required for processing 1 GOP worth of recorded data. Therefore, it is understood that the non-tracking processing unit 28 is required to have a high processing capacity A (FIG. 9B).

Therefore, the non-tracking processing circuit 28
When 0 and 282 are configured with the same components, processing operations with a margin can be performed as compared with the non-tracking processing unit 28, and when the same processing performance is required, compared with the non-tracking processing unit 28. Therefore, it is possible to use general parts having slow operation speed.

The relaxation of the operating conditions in the non-tracking processing circuits 280, 282 by adopting the configuration of the reproducing section 50 is the same for other components such as the data depacking circuits 340, 342.

After the operation at the 1 × speed reproduction , the reproduction unit 50 is the recording unit 1 of the VTR device 1 (FIG. 1).
The operation of reproducing the recording data (recording signal) recorded on the VTR tape 14 with 0 at 1 × speed will be described.
FIG. 10 is a diagram showing a configuration in the case where the reproducing section 50 shown in FIG. 5 reproduces the record data at the 1 × speed. As shown in FIG. 10, when the reproducing unit 50 reproduces the recorded data at the 1 × speed (normal reproducing speed), for example, the BD circuit 264 is used.
Routes the recording data input from any of the inner code correction circuits 260 and 262 so as to be output to the FIFO circuits 266 and 268. Only the signal processing system 42 and the FIFO circuit 344 operate, and the signal processing system 44 and The FIFO circuit 346 does not perform processing.

When reproducing at 1 × speed, the reproducing head unit 5
Of the two reproducing heads 224, 226, 228 and 230 (FIG. 6), for example, only the recording signal read by the reproducing head 224 is used. The tape running unit 16 runs the VTR tape 14 at the speed of 1 × speed reproduction, and the drum 220
Rotates at the rotation speed during 1 × speed reproduction. Equalization circuit 24
0 equalizes the recording signal read by the reproducing head 224 and reproduces the recording data.

The inner code correction circuit 260 performs error detection and error correction on the recording data using the inner code. B
The D circuit 264 buffers the recording data and
The signal is output to the signal processing system 42 via the FO circuit 266.

The signal processing system 42 performs non-tracking processing, error correction using an outer code, and depacking processing on the recorded data, and outputs it to the data recombining circuit 348 via the FIFO circuit 344. The data recombining circuit 348 performs data recombining processing and outputs 1 × speed audio / video data to the outside.

Incidentally, for example, not only the reproducing head 224 but also the reproducing heads 226 and 228 are used, and the VTR tape 1 is used.
The recording data is read out from No. 4, and the signal processing system 42, 44
May be used in parallel to reproduce three pieces of recorded data, and a majority decision may be taken to operate so as to further increase the reliability of the recorded data.

After the operation at the time of the 2 × speed reproduction , the reproducing unit 50 is the recording unit 1 of the VTR device 1 (FIG. 1).
The operation of reproducing the recording data (recording signal) recorded on the VTR tape 14 by 0 at double speed will be described.
Even when the recorded data is reproduced at double speed, as shown in FIG.
The recording data input from either 60 or 262 is FI.
The signal processing system 42 and the FIFO circuit 344 are routed so as to output to the FO circuits 266 and 268.
Only the signal processing system 44 and the FIFO circuit 3 operate.
46 does not perform processing.

When reproducing at 1 × speed, the reproducing head unit 5
Of the two reproducing heads 224, 226, 228 and 230 (FIG. 6), for example, only the recording signal read by the reproducing heads 224 and 226 is used. The tape running unit 16 is 1
The VTR tape 14 is run at a speed twice as fast as that at the double speed reproduction, and the drum 220 rotates at the rotational speed at the single speed reproduction. The equalizing circuits 240 and 242 are the reproducing head 2 respectively.
The recording signals read by 24 and 226 are equalized to reproduce the recorded data.

The inner code correction circuit 260 performs error detection and error correction on the recording data using the inner code. B
The D circuit 264 buffers the recording data and
The signal is output to the signal processing system 42 via the FO circuit 266.

The signal processing system 42 performs non-tracking processing, error correction using an outer code, and depacking processing on the recorded data, and outputs it to the data recombining circuit 348 via the FIFO circuit 344. The inner code correction circuit 260, the BD circuit 264, and the signal processing system 42 can individually operate at the processing speed related to the double speed reproduction, as described above. Data recombination circuit 348
Performs data recombination processing and outputs 1 × speed audio / video data to the outside.

Note that, for example, as in the case of performing the 1 × speed reproduction, not only the reproducing heads 224 and 226 but also the reproducing heads 228 and 230 are used to read the record data from the VTR tape 14, and the signal processing systems 42 and 44 are connected. The same two pieces of recording data may be reproduced in parallel two by two, and the recording data may be matched so that the reliability of the recording data is further enhanced.

Operation during head clog Now, the operation (the coping method) when the reproducing head is clogged (head clog) while the reproducing section 50 is performing the 1 × speed reproduction will be described. For example, as described above, when the recording data is reproduced by using the reproducing head 224, the reproducing head 224 may cause a head clog, and the recorded data may not be reproduced normally. When a head clog occurs in the reproducing head 224,
The error rate of the recorded data detected by the inner code correction circuit 260 increases.

In such a case, for example, when the error rates of the two recording data detected by the outer code correction circuit 320 both exceed a certain threshold value, the reproducing head 2
Instead of 24, the reproducing heads 226, 228, and 230 are sequentially used to read the recording data (recording signal) and perform the reproducing process. By configuring the reproducing unit 50 in this way, even if head clogs occur in any of the reproducing heads 224, 226, 228, and 230, the recorded data can be correctly reproduced.

Operation during shuttle reproduction The operation of the reproduction section 50 for performing shuttle reproduction of recorded data from the VTR tape 14 (FIG. 1) will be described below. Here, the shuttle reproduction means that the recorded data from the VTR tape 14 is 1
Arbitrary speed (m times, different from the running speed when playing back at double speed)
m ≠ 1) This is a playback method in which a VTR tape is run and only one playback head is used to play back as much audio / video data as possible, which is different from double-speed playback in which all audio / video data needs to be played back. ing. The case of 1 ≧ | m | is particularly referred to as jog reproduction, and the case of 1 <| m | is particularly referred to as shuttle reproduction.

The tape running unit 16 runs the recording data from the VTR tape 14 at an arbitrary speed, and the reproducing head 22
4 is used, the drum 220 rotates at a rotational speed corresponding to the tape running speed, and the reproducing head 2 of the reproducing head unit 52 is rotated.
24 (FIG. 6) is caused to scan the helical track of the VTR tape 14. Hereinafter, a case of m >> 1, for example, a case of m = 20 will be described.

The reproducing head 224 reads a recording signal from the VTR tape 14. The equalization circuit 240 equalizes the read recording signal and reproduces the recording data. The inner code correction circuit 260 performs error detection processing and error correction processing using the inner code on the reproduced record data.

The BD circuit 264 has non-tracking processing circuits 280, 28 with continuous GOPs as much as possible up to the processing capacity of the non-tracking processing circuits 280, 282.
All the recording data that has been subjected to error correction and the like so that it can be input to 2 are output to the non-tracking processing circuit 280 via the FIFO circuit 266.

That is, the BD circuit 264, for example, when the non-tracking processing circuit 280 has the ability to process the recording data of kGOP (k> 1) within 1 GOP time (FIG. 9), The recording data of k correlating GOPs that are continuous for each of the above are output to the non-tracking processing circuit 280, and the recording data that the non-tracking processing circuit 280 cannot process are discarded.

The non-tracking processing circuit 280 uses the FI
The recording data of k GOPs input via the FO circuit 266 is sequentially buffered in the memory circuit 300, the recording data having a low error rate is selected, and the deinterleave processing is performed on the selected recording data. I do. The outer code correction circuit 320 performs an error correction process using the outer code (FIG. 2A) on the deinterleaved recording data. The data depacking circuit 340 separates audio / video data and the like from the recorded data, and the jog memory circuit 3
The data is buffered in 60 and output to the data recombining circuit 348 via the FIFO circuit 344.

In the case of jog shuttle reproduction, the data recombining circuit 348 directly passes the input audio / video data and outputs it to the data thinning circuit 38. In the case of jog shuttle reproduction, the data thinning circuit 38 also passes the input audio / video data and outputs the audio data AOUT.
Is output to the outside, and the video data is output to the video data expansion circuit 40.

In this way, the non-tracking processing circuit 2
By supplying continuous recording data of GOP to the non-tracking processing circuit 280 in accordance with the processing capacity of 80, recording data (audio / video data) of k GOPs that have a mutual correlation are continuously generated. It is output to the outside. If the jog shuttle reproduction is performed without performing the processing described here, discrete audio / video data that are not correlated with each other will be output to the outside, and the quality of the audio / video data will be significantly reduced.

However, as described above, by configuring the reproducing unit 50 so as to output the continuous audio / video data of the GOP as much as possible, there is more correlation obtained by the jog shuttle reproduction. More audio / video data can be reproduced, and the quality of the reproduced audio / video data can be improved. Note that m can take any value, positive or negative. Further, for example, when -1 <m <1, the inner code correction circuit 260 and the signal processing system 42 are used.
Etc. to perform the same processing as the 1 × speed reproduction, and repeatedly output the buffered audio / video data to the jog memory circuit 360, thereby compensating for the audio / video data that is insufficient due to the magnification m <1. I'll do it.

As described above, the magnetic tape data reproducing apparatus (VTR apparatus 1 and reproducing sections 20, 5 according to the present invention.
In 0), since the conditions for the operation speed of the constituent parts are mild, it is not necessary to use a special high-speed operation component when developing the VTR device 1. Therefore, if you proceed with the development using general parts, and if high-speed operation parts become cheaper and more common, replace the components made up of general parts to achieve higher performance. Development is possible. Also, the development cost is low.

Further, according to the magnetic tape data reproducing apparatus of the present invention, even when a normal speed reproduction (single speed reproduction) model is further equipped with a double speed reproduction (high speed reproduction) function, it is particularly expensive. Since it does not require cost, system flexibility can be increased. Further, according to the magnetic tape data reproducing apparatus of the present invention, even if a head clog occurs in the reproducing head, no trouble occurs in normal reproduction. Moreover, the magnetic tape data reproducing device according to the present invention can improve the quality of the audio / video data obtained by the jog shuttle reproduction.

The V shown in each of the embodiments described above is used.
Each component of the TR device 1 and the reproducing units 20 and 50 may be configured by software or hardware as long as the same function and performance can be realized. The number of reproducing heads of the reproducing head unit 52 is an example. Further, by appropriately controlling the respective components of the tape running unit 16, the drum 220, and the reproducing unit 50 of the VTR device 1, particularly the jog memory circuits 360 and 362, in addition to the integral multiple speed reproduction, It is also possible to perform non-integer multiple speed reproduction such as 1 ×.

[0111]

As described above, according to the magnetic tape data reproducing apparatus according to the present invention, the VTR performing the 1 × speed reproduction.
It is possible to provide a non-tracking magnetic tape data reproducing device (VTR device) capable of double-speed reproduction while using mechanical parts having the same accuracy as the device. Further, according to the present invention, it is possible to provide a non-tracking type magnetic tape data reproducing apparatus capable of double-speed reproduction without using a special high-speed operation component in the equalization processing circuit or the error correction processing circuit. it can. Further, according to the present invention, it is possible to improve the performance of other special reproduction processing functions, for example, the jog shuttle reproduction function, by utilizing the constituent parts used for realizing the double speed reproduction.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a VTR device according to the present invention in a first embodiment.

FIG. 2 is a diagram showing a structure of a sync block of audio / video data recorded on the VTR tape shown in FIG.

FIG. 3 is a diagram showing a data structure of identification data ID shown in FIG.

FIG. 4 is a diagram showing a recording format when recording recording data (FIG. 2) on a VTR tape (FIG. 1).

FIG. 5 is a diagram showing a configuration of a reproducing unit according to the present invention in a second embodiment.

FIG. 6 is a diagram illustrating the configuration of the reproducing head unit shown in FIG. 5 in the case where the number of reproducing heads is four.

7 is a timing chart showing the operation timing of each component of the reproducing section shown in FIG.

FIG. 8 is a diagram showing a relationship between overhead related to non-tracking processing and bus bandwidth.

FIG. 9 is a diagram showing the relationship between the overhead related to non-tracking processing, the processing capacity required for the components performing the non-tracking processing, and the bus bandwidth.

10 is a diagram showing a configuration in the case where the reproducing section shown in FIG. 5 reproduces recorded data at 1 × speed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... VTR apparatus, 10 ... Recording part, 100 ... Video data compression circuit, 102 ... Data packing circuit, 104 ... Outer code encoder circuit, 106 ... Memory circuit, 108 ... Inner code encoder circuit, 12 ... Recording head part, 22, 52 ...
Playback head section, 220 ... Drums, 224, 226, 22
8, 230 ... Playback head, 24 ... Equalization section, 240, 24
2, 244, 246 ... Equalization circuit, 26 ... Inner code correction unit,
260, 262 ... Inner code correction circuit, 264 ... BD circuit,
266, 268 ... FIFO circuit, 28 ... Non-tracking processing section, 280, 282 ... Non-tracking processing circuit, 30 ... Memory section, 300, 302 ... Memory circuit, 3
2 ... Outer code correction unit, 320, 322 ... Outer code correction circuit,
34 ... Data depacking unit, 340, 342 ... Data depacking circuit, 344, 346 ... FIFO circuit, 3
6 ... Jog memory unit, 360, 362 ... Jog memory circuit, 38 ... Data thinning circuit, 40 ... Video data expansion circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location G11B 20/18 572 9558-5D G11B 20/18 572G (72) Inventor Jun Atsuta Shinagawa-ku, Tokyo Kita-Shinagawa 6-735 Sony Corporation (72) Inventor Ryuji Yamazaki 6-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Junichi Ogikubo Kita-Shinagawa, Shinagawa-ku, Tokyo 6-735 Sony Corporation (72) Inventor Soichiro Niho 6-735 Kitashinagawa Kitagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (4)

[Claims] 1. A rotary drum, n (n ≧ 2) data read head means arranged on the outer peripheral surface of the rotary drum, and data reproducing means are provided, and the first azimuth angle and A magnetic tape data reproducing apparatus for reproducing recorded data recorded on a helical track of a tape recording medium at a second azimuth angle by using identification data recorded on the helical track and indicating an order of the recorded data, The rotating drum rotates at a constant rotation speed to cause the n sets of data read head means to scan the helical track, and each of the n data read head means is provided with the first azimuth angle. Two helical first tracks that scan the helical track across one line and read the recording data and the identification data.
Reproduction head, the helical track provided with the second azimuth angle, and the second second track which scans the helical track with a space between them to read the recording data and the identification data.
Reproducing heads, the data reproducing means includes error detecting means for detecting an error in each of the identification data and the recording data read by the n data reading head means, and the n data reading heads. When recording the recording data selected based on the identification data corresponding to each of the selected recording data among the recording data read by each of the recording data, the recording data having the smallest error A magnetic tape data reproducing device having a data arranging means for arranging and outputting in order. 2. The data reproducing means is provided corresponding to each of the n data read head means or each part, and detects an error in each of the record data read by the corresponding data read head means. A plurality of error detecting means and n pieces of data reading head means are provided corresponding to each or each of the portions, and the recording with the smallest error among the recording data detected by the corresponding error detecting means. A plurality of data selecting means for selecting data, wherein the data arranging means arranges the recording data selected by each of the n data selecting means in a recording order based on the corresponding identification data. The magnetic tape data reproducing apparatus according to claim 1, wherein the magnetic tape data reproducing apparatus outputs the data. 3. The tape recording medium has a running speed m times (2 ≦ | m | ≦) when the recorded data is reproduced at a 1 × speed.
n) times the traveling speed, the rotary drum rotates at a rotational speed corresponding to the traveling speed of the tape recording medium when the recorded data is reproduced at the 1 × speed, and the n data read heads are rotated. Means for scanning the helical track, and the n number of data read head means for scanning the helical track read the recording data and the identification data from each of the scanned helical tracks, and the data reproducing means has the n number of data read heads. The recording data read by m of the data reading head means are arranged in the order of recording based on the corresponding identification data,
The magnetic tape data reproducing apparatus according to claim 2, wherein the recorded data is output at m-times speed. 4. The recording data is audio / video data, the tape recording medium travels at a traveling speed different from a traveling speed at the time of reproducing the audio / video data at 1 × speed, and the rotary drum is The data read head means for rotating at a rotation speed corresponding to the running speed of the tape recording medium to cause all or part of the n data read head means to scan the helical track and to scan the helical track. Each reads the audio / video data and the identification data from each of the scanned helical tracks, and the data reproducing means buffers and outputs the audio / video data arranged in the order of recording. The data read head means for scanning the helical track, Magnetic tape data reproducing apparatus according to claim 2, sequentially the audio and video data, performs a jog shuttle reproduction and output.