JPH03250465A - Video tape recorder - Google Patents

Abstract

PURPOSE:To prevent lack of a recording data and to evade deterioration of a reproducing picture and a reproducing sound by detecting whether a recording error is generated in a recording signal or not and recording the signal with a preliminary recording means when the recording error is detected. CONSTITUTION:When a main recording head 4A of a 1st recording and reproducing system 10A is brought under the infeasible state of recording the recording signal SREC and the recording signal SREC is not recorded, this is detected by a clogging detecting circuit 18 via a reproducing head 5A, and a switch circuit 12 is immediately turned off, and also a switch circuit 16 is turned on as well, and then the recording head 4A is changed over to the preliminary recording head 15A to continue the recording operation. By this constitution, when the main recording heads 4A-4D are clogged and so forth to come under the infeasible state of recording the recording signal SREC, they are replaced with the corresponding preliminary recording heads 15A-15D to record a data, so that the recording signal SREC can securely be recorded, and lack of the recording data is prevented, and hence deterioration of the reproducing picture and reproducing sound can be evaded.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A: Industrial field of application B: Outline of the invention C: Prior art (Figs. 5 to 9) D: Problems to be solved by the invention E: Means for solving the problems (Figs. 1 and 9) F Effects (Figures 1 and 3) G Example (G1) First Example (Figures 1 and 2) (G2) Second
Embodiments (Figures 3 and 4) (G3) Other Embodiments H Effects of the Invention A Industrial Application Field The present invention relates to a video tape recorder, and in particular to a video tape recorder for recording digital video signals and digital audio signals on magnetic tape. It is suitable for application to a video tape recorder (VTR).

B. Summary of the Invention The present invention provides a video tape recorder in which, when a recording error occurs in the recording signal recorded by the first recording means, the second recording means records in place of the recording signal. , the recording signal can be recorded reliably.

C. Prior Art Conventionally, in a video tape recorder (digital VTR) for recording and reproducing digital video signals, for example, a fifth
As shown in the figure, a recording signal 5xzc consisting of a digital video signal and a digital audio signal sent from the recording circuit 3 via the recording head 4A is sequentially recorded on the magnetic tape 1 running in the direction indicated by arrow a, and By immediately reproducing the reproduced signal S□ read out through the reproducing head 5A in the reproducing circuit 6, it is possible to monitor whether the digital signal is being recorded correctly.

Furthermore, it has been proposed that during reproduction, the reproduced signal is temporarily stored, the recorded signal on the magnetic tape 1 is erased, and the stored reproduced signal is rewritten (in particular, Publication No. 56-156975).

Here, on the magnetic tape 1, for example, as shown in FIG. 6, rows are sequentially arranged at a track pitch TP (tracks TRI, TR2, . . . , six of them are G7)).
Rack TRl-TR6 is connected to 11a and LT1 field's worth of digital video signals and digital audio signals are connected to 6
The data is divided and allocated to each track TRI to TR6 for recording.

Each of the tracks TRI to TR6 is divided into an area ARV for recording digital video signals (this is called a video area) and an area ARA for recording digital audio signals (this is called an audio area).

As shown in FIG. 7, the video area ARV includes, for example, a recording head area (this is called a sync block) SBV 1 to 5.
It is subdivided into BVk, and each sync plotter records a sync pattern, ID pattern, data block, and error control data.

Further, the audio area ARA is divided into, for example, four channel areas ARA1 to ARA4, and as shown in FIG.
Similarly to the case of the video area ARV, n sync blocks 5BAt 1 to 5BAtn (t=1.2.3.4
), and the data of the digital audio signal of 4 channels is allocated to a 4% sync block for each channel and recorded.

In a digital VTR configured to record and reproduce digital video signals and digital audio signals on a magnetic tape l having a format such as No. 9,
A rotating drum 7 having the configuration shown in the figure is used.

That is, the rotating drum 7 has a magnetic tee 11 wound around the circumferential side 7A by guide posts 8A and 8B.
The magnetic tape 1 runs in the direction indicated by the arrow a, and the rotating drum 7 rotates in the direction already indicated by the arrow.

This rotary drum 7 has four recording and reproducing systems, and a total of four recording and reproducing systems similar to the first recording and reproducing system consisting of the recording head 48 and the reproducing head 5A described above in connection with FIG. 5 are provided. There is.

That is, on the circumferential side 7A of the rotating drum 7, there is a track TRI.
A recording head 4A is provided for scanning the recording head 4A (FIG. 6), and the recording head 4A is located at a position spaced apart from the recording head 4A by an angular interval of 90 degrees in the counter-rotation direction of the rotary drum 7.
A reproducing head 5 that reproduces and scans the track TR1 following the
A is arranged to constitute a first recording/reproducing system (FIG. 5).

Further, a recording head 4B and a reproducing head 5B are arranged as a second recording/reproducing system, which sequentially scan the track TR2 with a deviation from the recording head 4A and the reproducing head 5A by a track pitch TP, respectively.

Furthermore, a recording head 4C and a reproducing head 5C are arranged as a third recording/reproducing system at positions separated by an angular interval of 180 degrees from the recording head 4A and reproducing head 5A, respectively, and are configured to sequentially scan the track TR3. At the same time, the track TR4 is shifted by the track pitch TP with respect to the recording head 4C and the reproducing head 5C.
A recording head 4D and a reproducing head 5D are arranged as a fourth recording/reproducing system.

In this way, four systems of recording and reproducing systems are formed in the rotating drum 7, and while the rotating drum 7 makes half a revolution, the recording head 4
After tracks TR1 and TR2 are scanned for recording by A and 4B, recording heads 4C and 4D are moved during the subsequent half rotation.
Tracks TR3 and TR4 are scanned for recording, and during further half a rotation, tracks TR5 and TR6 are scanned by recording rads 4A and 4B.

Therefore, every time the rotating drum 7 rotates 1.5 times, one field's worth of digital video signals and digital audio signals are sequentially recorded on the tracks TRI to TR6.

On the other hand, the reproducing heads 5A and 5B are
The tracks TRI and TR2 scanned by the recording heads 4A and 4B are scanned by the recording heads 4A and 4B.
and 4B immediately reproduce and monitor the recording signals recorded by the reproducing heads 5C and 5D.
scans the tracks TR3 and TR4 scanned by the recording heads 4C and 4D following the recording heads 4C and 4D,
The recording signals recorded by the recording heads 4C and 4D are immediately reproduced and monitored.

In this way, digital video signals and digital audio signals are sequentially recorded on the tracks TRI to TR6 of the magnetic tape 1 by the recording heads 4A to 4D, and the digital video signals and digital audio signals are correctly recorded by the subsequent playback heads 5A to 5D. It is possible to monitor whether or not the

D Problems to be Solved by the Invention By the way, in a digital VTR having such a configuration, the recording heads 4A to 4D scan the magnetic tape 1 while slidingly contacting the magnetic tape 1 and the recording heads 4A to 4D.
Foreign matter such as dust may become trapped between the recording heads 4D, resulting in a so-called dropout in which recorded data is partially lost, or foreign matter such as dust may become trapped in the head gap of the recording heads 4A to 4D, resulting in continuous recorded data. There has been a problem in that so-called clogs that are missing occur during playback, resulting in deterioration of reproduced images and reproduced sounds.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a video tape recorder that can prevent the loss of recorded data and avoid deterioration of reproduced images and reproduced sounds.

E Means for Solving Problem E To solve this problem, the first invention provides a video tape recorder 10 that records a predetermined recording signal S REc on recording tracks formed diagonally in sequence on a recording medium 1. At .30, a recording signal of 5 RIC is applied to the recording track.
first recording means 4A, 4B, 4C, 4D for recording;
The first recording means 4A, 4B, 4C14D record the recording signal S
Recording signal S IIE from the recording track where IEc was recorded
reproducing means 5A, 5B, 5C15D for reading out c. When a recording error is detected by the detection means 18.36, second recording means 15A, 15 record the recording signal SIIEc in place of the first recording means 4A, 4B, 4C14D.
B, 15C115D, 31A, 31B, 31C131D
and be prepared.

Further, in the second invention, the second recording means 31A, 3
1B, 31C131D, the recording signal S is applied only to the recording area where a recording error has been detected by the recording error detection means 36.
Complementary recording of RtC is performed.

F action The first recording means 4A, 4B, 4C14D record the recording signal S□
, when it becomes impossible to record the second recording pads 15A, 15B, 15'C115D, 31A, 31B,
31C and 31D instead record the recording signal SR1:C, so that no recording error remains on the recording medium 1.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

(G1) First Embodiment In FIG. 1, parts corresponding to those in FIG. 5 are denoted by the same reference numerals.
0A is a recording signal S mtc consisting of a digital video signal and a digital audio signal sent from the recording circuit 3.
is sent to the switch circuit 12 and delay circuit 13.

The switch circuit 12 is controlled to be in the ON state in the normal recording mode, and by sending the recording signal 5RIC to the main recording head 4A, the recording signal Sl[C based on It is designed to record data automatically.

On the other hand, the delay circuit B13 delays the recording signal 5RfC for each track by a delay time corresponding to the running speed of the magnetic chip 11 and the interval between the main recording head 4A and the auxiliary recording head 15A. When the RAD 15A scans the track scanned by the head 4A for recording, the recording signal S REc is sent to the switch circuit 16 at a timing when the preliminary recording head 1.5A can record the recording signal S REc.

The switch circuit 16 is controlled to be in an OFF state in the normal recording mode, so that the recording signal SREC is not sent to the preliminary recording head 15A in this state.

Therefore, in normal recording mode, the main recording head 4
A recording signal SIEc is recorded on the magnetic tape 1 by A.

Here, the data recorded by the main recording head 4A is immediately inputted to the clog detection circuit 18 via the reproduction head 5A for monitor reproduction.

The clog pressure detection circuit 18 detects the data recorded on the tracks TRI, TR2, ... (Fig. 6) by the main recording head 4A as a high frequency signal (RF signal), and detects the envelope of the iRF signal. do.

If the envelope is no longer detected at this time, the clog detection circuit 18 determines that the main recording head 4A is in a clog generation state in which data cannot be recorded on the magnetic tape 1, and immediately switches the clog detection signal S□. The signal is sent to the circuits 12 and 16, and the switch circuit 12 is controlled to be in an off state, and the switch circuit 16 is controlled to be in an on state.

Therefore, the main recording head 4A is controlled to a recording stop state by not being applied with the recording signal S lfc, and
The preliminary recording head 15A starts receiving the recording signal 5ltC sent from the delay circuit 13 and starts recording operation.

Therefore, at this time, the data from the delay circuit 13 is recorded by the rad 15A in the preliminary recording in the area after the area being scanned by the preliminary recording head 15A.

At this time, the data input to the preliminary recording head 15A is delayed by the predetermined time in the delay circuit 13, so that the data allocated to the area is almost continuous in the recording start portion by the preliminary recording head 15A. recorded.

Thus, by the time the recording error area arrives at the scanning position of the preliminary recording head 15A, the preliminary recording head 15A has already
Since A is performing a recording operation, a recording signal S R is applied to the recording error area by the preliminary recording head 15A.
[C is recorded, and the preliminary recording head 15A continues the recording operation thereafter.

In this way, when a loss of recorded data due to a clog or the like is detected via the playback head 5A, the data is transferred to preliminary recording.
In this embodiment, as a method for continuously recording data by switching to 5A, the rotating drum 1 having the configuration shown in FIG.
Use 9.

That is, the rotating drum 19 has the magnetic tape 1 on the circumferential side 19A.
is wound helically by guide posts 8A and 8B, so that the magnetic tape 1 runs in the direction indicated by arrow a, and the rotating drum 19 rotates in the direction indicated by arrow a.

This rotating drum 19 has four recording and reproducing systems, the first
The main recording head 4A and the reproducing head 5A described above with respect to the figure.
and a first recording/reproducing system 10 consisting of a preliminary recording head 15A.
A total of four recording/reproducing systems similar to A are provided.

That is, a track T is provided on the circumferential surface 19A of the rotating drum 19.
The main recording head 4A scans the RI (Fig. 6), and the main recording head 4A is located at a position separated by an angular interval of 90 degrees in the counter-rotation direction of the rotating drum 9.
A playback head 5A is arranged to immediately read back and scan the trunk TRI recorded and scanned by A, and the playback head 5A
At a position a predetermined angular interval away from the rotary drum 19 in the counter-rotation direction, there is a track TR1 following the playback RAD 5A.
A preliminary recording head 15A for scanning is arranged to constitute a first recording/reproducing system 10A (FIG. 1).

Also, a main recording head 4B that sequentially scans the track TR2 with a track pitch TP shift relative to the main recording head 4A, the reproduction head 5A, and the auxiliary recording head 15A, respectively;
A reproducing head 5B and a preliminary recording head 15B are arranged as a second recording/reproducing system.

Further, a main recording head 4C1 is installed as a third recording/reproducing system at a position separated by an angular interval of 180 degrees from the main recording head 4A, the reproducing head 5A, and the auxiliary recording head 15A.
A reproducing head 50 and a preliminary recording head 15C are arranged,
The track TR3 is sequentially scanned, and the main recording head 4C, the reproduction head 5C, and the auxiliary recording head 15c are shifted by the track pitch TP to the main recording head constituting the fourth recording and reproduction system. )′
4D, a reproduction head 5D, and a preliminary recording head 15D are arranged to sequentially scan the track TR4.

Here, in the second, third and fourth recording and reproducing systems, the first
Similarly to the first recording/reproducing system described above with reference to the figure, the same data as that recorded in the corresponding tracks via the recording heads 4B, 4C and 4D is transferred via the preliminary recording heads 15B, 15C and 15D. It is possible to record on each track.

Therefore, in the middle of recording data on the magnetic tape 1, the main recording heads 4B to 4D are replaced by the preliminary recording heads 1.5B to 4D.
Even if you try to switch to 15D, tracks TR2 and T
R3, ......, each track TR2, TR
3. The data assigned to . Even if this occurs, the preliminary recording heads 15B to 15D record data instead.

In the above configuration, for example, the first recording/reproducing system 1, the OA
A clog or the like occurs in the main recording head 4A, and the recording signal s
+ttc cannot be recorded, and the recording signal S□ is applied to the track TRI which the king recording head 4A is scanning for recording. is no longer recorded, the clog detection circuit 18 detects this via the playback head 5A, and immediately turns off the switch circuit 12 and turns off the switch circuit 16A.
By turning off the recording head 4A, the recording head 4A is switched to the preliminary recording head 15A and the recording operation is continued.

At this time, since the preliminary recording head 15A is disposed downstream in the running direction aO of the magnetic tape 1 with respect to the playback/rad 5A, the preliminary recording head 15A is arranged on the track TRI.
When scanning a portion where a recording error has occurred, the preliminary recording head 15A has already been switched to the recording operation, so that the recording signal S1. can be re-recorded.

In this way, the auxiliary recording head 15A instead of the main recording head 4A records data on the track that the main recording head 4A scans for recording from now on.

At this time, when the playback head 5A scans the recording error area for reproduction and is switched from the main recording head 4A to the preliminary recording head 15A, the recording data has already been recorded by the recording head 4A between the reproduction head 5A and the preliminary recording head 15A. The same data is overwritten in this portion by the preliminary recording head 15A.

At this time, in the part where overwriting has started, the area recorded by the recording head 4A and the area recorded by the preliminary recording head 15 are
A boundary with the area overwritten by A may occur, and the data may become discontinuous in this area, but in this case, only the data of the sync block where this boundary area occurred will be corrected by dropout compensation etc. By performing error correction using this means, it is possible to prevent the reproduced image from deteriorating to a practically sufficient extent.

(The recorded data is continuously recorded on the magnetic tape 1 within a practically sufficient range.

Similarly, in the second, third, and fourth recording/reproducing systems, when clogs or the like occur in the main recording heads 4B, 4C, and 4D, the corresponding preliminary recording heads 15
B, 15C, and 15C are arranged to record in place of this, and thereby it is possible to prevent the occurrence of a dropout of recorded data that would deteriorate the reproduced colossus.

According to the above configuration, when a clog or the like occurs in the main recording heads 4A to 4D and the recording signal s + ttc cannot be recorded, the preliminary recording corresponding to the main recording heads 4A to 4D, respectively, is performed. By having the heads 15A to 15D record data in place of ζ, it is possible to reliably record the recording signal S i[c.

(G2) Second Embodiment In FIG. 3, parts corresponding to those in FIG.
At 0A, the recording signal 5I sent from the recording circuit 3
IICC is input to the main recording radar 4A and recorded on the magnetic chip 11 running in the direction shown by arrow a, and the recording signal 5IEC is input to delay circuits 33 and 34.

The delay circuit 33 delays the recording signal 5RIC by a delay time corresponding to the running speed of the magnetic tape 1 and the distance between the main recording head 4A and the reproducing head 5, and then sends it to the subsequent recording error detection circuit 36. .

The recording error detection circuit 36 compares the reproduction signal S□ input via the reproduction head 5A with the recording signal Sll[C input manually from the delay circuit 33.

That is, the recording signal S i+E is transmitted via the main recording head 4A.
The recording signal S1c recorded on the track TRI is delayed at the timing at which the reproduction head 5A following the track TRI (FIG. 6) in which c has been recorded reproduces and scans and inputs the reproduction signal 5PII to the recording error detection circuit 36. It is input to the recording error detection circuit 36 via the circuit 33 and compared with the reproduced signal S□, thereby making it possible to judge whether or not the recording signal SR[C is correctly recorded on the track TR1. .

At this time, if the reproduced signal S4 is different from the recorded signal 5RIC, the recording error detection circuit 36 determines that the main recording head 4A did not correctly record the recording signal S1c on the magnetic tape 1, and tracks the recording error in the track where the recording error occurred. The error detection signal S_DET is sent to the switch circuit 37 at the timing when the subsequent pre-recording head 31A starts scanning.

The switch circuit 37 is controlled to be in the OFF state in the normal state, and is turned on only while the error detection signal sp_pt'r is input. Therefore, the switch circuit 37 is controlled to be in the OFF state in the preliminary recording head 3'.

By turning on at the timing when A starts scanning the track where the recording error has occurred, C: sends the recording signal S+tC input via the delay circuit 34 to the preliminary recording head 31A.

Here, the delay circuit 34 is configured to delay the recording signal sttc by a delay time corresponding to the running speed of the magnetic tape 1 and the interval between the main recording head 4A and the preliminary recording head 31A.

Therefore, the recording signal s mtc input to the preliminary recording head 31A via the delay circuit 34 is
Since 1A is the recording signal applied to the track to be scanned, the main recording head 4A causes a recording error and the recording signal S*tC is not correctly recorded on the track by the preliminary recording head 31A. The assigned recording signal S*tC is recorded again.

Thereafter, when the reproduction signal S□ matches the recording signal s arc in the recording error detection circuit 36, the recording error detection circuit 36 determines whether the main recording head 4A is performing the correct recording operation while the reproduction head 5A is scanning. After the preliminary recording head 31A finishes scanning the track, the transmission of the recording error detection signal DDta is stopped.

When the second track correctly recorded in this manner arrives at the scanning position of the preliminary recording head 31A, the recording signal from the delay circuit 34 is no longer input to the preliminary recording head 31A, so that on the magnetic tape 1, A recording signal is supplementarily recorded by the preliminary recording head 31A only on the track where a recording error has occurred.

As a method for recording the recording signal 5irc on the magnetic tape 1 in this manner, in the case of this embodiment, a rotating drum 39 having the configuration shown in FIG. 4 is used.

That is, the rotating drum 39 is configured so that the magnetic tape 1 traveling in the direction shown by the arrow a is wound around the circumferential side surface 39A by the guide poles 8A and 8B, and at the same time, it rotates in the direction already shown by the arrow.

This rotating drum 39 has four recording and reproducing systems, and a third
The main recording head 4A and the reproducing head 5A described above with respect to the figure.
A total of four recording/reproducing systems similar to the first recording/reproducing system consisting of the auxiliary recording head 31A and the preliminary recording head 31A are provided.

That is, a track T is provided on the circumferential surface 39A of the rotating drum 39.
A main recording head 4A configured to scan the RI (FIG. 6) and a rotating drum 39 for the main recording head 4A.
The playback head 5 is spaced apart by an angular interval of 90 degrees in the counter-rotational direction of
A is arranged, and furthermore, a pre-recording rod 31A is arranged at a predetermined angular interval in the counter-rotation direction of the rotary drum 390 with respect to the reproducing head 5A, and a first recording/reproducing thread 30A is arranged.
(FIG. 3), the reproducing head 5A and the auxiliary recording head 31A successively scan the track TRI scanned by the main recording head 4A.

Further, a main recording head 4B is provided which is configured to scan the track TR2 with a deviation from the main recording head 4A by a track pitch TP, and is 90 degrees in the counter-rotational direction of the rotary drum 39 with respect to the main recording head 4B. A reproducing head 5B is arranged at an angular interval of 100 degrees, and a preliminary recording head 31B is arranged at a predetermined angular interval in the counter-rotation direction of the rotating drum 39 with respect to the reproducing head 5B. A system is constructed such that the reproducing head 5B and the auxiliary recording head 31B successively scan the track TR2 scanned by the main recording head 4B.

This second recording/reproducing system is configured to sequentially record data on the track TR2 based on the recording signal SIIEC by a recording operation similar to that of the first recording/reproducing system 30A described above with reference to FIG. .

Further, a main recording head 4C is provided which scans the track TR3 at an angular interval of 180 degrees with respect to the main recording head 4A, and is arranged in the counter-rotational direction of the rotary drum 39 with respect to the main recording head 4C. A reproducing head 5C is arranged at an angular interval of 90 degrees, and the reproducing head 5C
A spare recording head 31C is arranged at a predetermined distance from C in the counter-rotation direction of the rotating drum 39 to constitute a third recording/reproducing system, and reproduces the track TR3 scanned by the main recording head 4C. The head 5C and the preliminary recording head 31C are configured to sequentially scan.

This third recording/reproducing system is configured to record data on the track TR3 based on the recording signal 5IIC by a recording operation similar to that of the first recording/reproducing system 30A described above with reference to FIG.

Also, 18
A main recording head 4D that scans the track TR4 is provided at a position separated by an angular interval of 0 degrees.
A reproducing head 5D is arranged at an angular interval of 90 degrees in the counter-rotational direction of the rotating drum 39, and a predetermined angular interval is arranged in the counter-rotating direction of the rotating drum 390 with respect to the reproducing head 5D. A recording head 31D is arranged to constitute a fourth recording/reproducing system, and a main recording head 4
The track TR4 scanned by D is successively scanned by the RAD 5D and the preliminary recording head 31D for reproduction.

The main recording head 4D, the reproducing head 5D, and the preliminary recording head 31D perform a recording operation similar to the recording operation of the first recording/reproducing system 30A described above with reference to FIG.
Data is recorded in R4 based on the recording signal sate.

In the above configuration, the magnetic tape J is controlled by the main recording heads 4A to 4D in the first to fourth recording and reproducing threads, respectively.
The data is recorded in the tracks TRI, TR2, . To detect.

On the track where a recording error has been detected, data is supplementarily recorded on a track-by-track basis by the preliminary recording heads 31A to 31D.

Therefore, within each trunk, no boundary is formed between the portion recorded by the main recording head and the portion recorded by the auxiliary recording head.

Therefore, every time a recording error occurs, the spare recording head 3I
Even when complementary recording is performed by A to 310, the recorded data does not become discontinuous within each track, so that continuous data is reliably recorded on all tracks.

According to the above configuration, the main recording head detects whether or not a recording error has occurred in the data recorded on the track, and if a recording error has occurred, the auxiliary recording head detects the recording error. By complementary recording the data to be recorded on the track including the area, the recording signal S1. data based on the data can be recorded.

(G3) Other Embodiments (1) In the above-described embodiments, a case has been described in which data is supplemented on a track-by-track basis, but the present invention is not limited to this. For example, data may be supplemented on a sync-block basis. , the data may be supplemented in units of various data units.

(2) In the above embodiment, a case was described in which one field of digital video signal and digital audio signal was divided into six tracks and recorded, but the present invention is not limited to this, and for example, one field can be divided into one track or recorded. The present invention can also be applied when recording on multiple tracks.

(3) In the above-described embodiment, a case has been described in which recording error detection and data rewriting are performed once, but the number of error detection and data rewriting is not limited to this, and may be multiple times.

(4) In the above embodiment, a digital V T having a rotating drum configured by four recording/reproducing systems
Although the present invention is applicable to R, the present invention is not limited thereto, and the present invention can be applied to a fixed head type magnetic recording device, such as a digital VTR 1 having a rotating drum with various numbers of heads.

(5) In the embodiments described above, the present invention is
As described above, the present invention is not limited to this, and can also be applied to a recording device that records a recording signal on a recording track on a magnetic tape, and further to a recording medium such as a magneto-optical tape. It is widely applicable to other recording devices adapted to record recording signals on top.

H Effects of the Invention As described above, according to the present invention, a video tape is provided in which a recording signal can be reliably recorded by recording the recording signal using a backup recording means in the 6M recording area where a recording error has occurred. A recorder can be realized.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of a video tape recorder according to the present invention, FIG. 2 is a plan view showing the configuration of a rotating drum thereof, and FIG. 3 is a block diagram showing a second embodiment of a video tape recorder according to the present invention. 4 is a plan view showing the configuration of the rotating drum, FIG. 5 is a block diagram showing the conventional example, FIG. 6 is a plan view showing the format of the magnetic tape, and FIG. 7 is an image of the recording track. FIG. 8 is a route map showing the arrangement of areas, FIG. 8 is a route map showing the arrangement of audio areas of recording tracks, and FIG. 9 is a plan view showing the configuration of a conventional rotary drum. 1... Magnetic tape, 4A, 4B, 4C14D.
...Main recording head, 5A, 5B, 5C15D...
...Playback head, 10.30...Video tape recorder, 12.16.37...Switch circuit, 13.33.34...Delay circuit, 15A
, 15B, 15C115D, 31A, 31B, 31C1
31D...Spare recording head, 18...
Clog detection circuit, 36... recording error detection circuit. Agent Keiichi Tanabe 1Qσ° Digit 7 Recorder 1v: 1 B9 Town: Intade: Top] Shishi] 1st @ A B Record 71'/) El Fig. 3 7'L coda 脣5 Z 76 colors of stains υ Figure 3 A B Record';/)'''/l/ l Placement of the record] 1 Figure

Claims (2)

[Claims] (1) In a video tape recorder that records a predetermined recording signal on recording tracks that are sequentially formed diagonally on a recording medium, a first recording means that records the recording signal on the recording track; reproducing means for reading out the recorded signal from the recording track on which the means has recorded the recording signal; and recording error detecting means for detecting whether or not a recording error has occurred in the recorded signal read by the reproducing means. and a second recording means for recording the recording signal in place of the first recording means when the recording error is detected by the recording error detection means. Tape recorder. (2) The second recording means supplementally records the recording signal only in the recording area where a recording error has been detected by the recording error detection means. The videotape recorder described in Section.