JPH10188401A - Magnetic recording / reproducing apparatus having head phase adjusting means - Google Patents

Abstract

(57) [Problem] To automatically adjust the head phase for the SDL mode if only a tape recorded in the SD mode is prepared.
Provided is a magnetic recording / reproducing apparatus compatible with SD mode and SDL mode conforming to the Digital VCR for Consumer-Use standard. SOLUTION: A set of heads L and R for reproducing in SD mode and a set of heads L and R 'for reproducing in SDL mode are connected to three switches 4, 5, and 6 by a control circuit 10,
Selection is made by operating at step 17. Synchronization information IT inserted at a predetermined position of the recording signal from the reproduction signal of the head
I is obtained by the detection circuit 10, and a phase deviation is obtained from this ITI and the original synchronization position obtained by the synchronization reference PG signal of the head drum, and the drum phase is controlled. In order to automatically adjust the head phase of R 'used in the SDL mode on the SD mode recording tape, the switches 4, 5, and 6 operate differently from normal to detect the relationship between the drum PG signal and the head R' reproduced signal. Let

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a digital VCR for
The present invention relates to a three-head digital VTR compatible with the SD mode and the SDL mode conforming to the Consumer-Use standard, and more particularly, to an automatic head phase adjustment technology in the VTR.

[0002]

2. Description of the Related Art First, a tape reproducing method in an SD mode system based on the Digital VCR for Consumer-Use standard will be described with reference to the accompanying drawings. Figure 4 shows the Digital
FIG. 1 shows a system block diagram of an SD mode according to the VCR for Consumer-Use standard. By selecting the head that always traces the tape with the L / R head changeover switch 5, the signals recorded in the tape stock are read one after another, and the envelope is reproduced. The envelope is amplified by the head amplifier 7 and ATF (Automatic Trac
k Finding) circuit 9 and a PLL (Phase Locked Loop) circuit 8. ATF ERROR from ATF circuit 9
An R signal is output, which is input to the capstan phase error calculation circuit 12 inside the microcomputer 18 and used for capstan phase control.

[0003] A digital signal is output from the PLL circuit 8 and is mainly input to a video and audio processing circuit (not shown). On the other hand, the drum 20 (see FIGS. 8, 9,
) As the phase reference signal of the drum 20.
The G signal is output and input to the drum phase error calculation circuit 15 inside the microcomputer 18 and used for phase control of the drum 20. The drum PG signal is also input to the head switching signal generation circuit 16 described above, and the head switching signal is generated based on the signal. The phase relationship between the drum PG 19 (see FIGS. 8 and 9 described later) and the head Is the drum 20
Since it is unknown at the time when is created, it is necessary to measure and correct the phase relationship between the drum PG19 and the head by some method. Measuring this correction value and writing the correction value to the memory 14 is head phase adjustment. After the adjustment, the correction value is read from the memory 14 to correct the phases of the drum PG 19 and the head switching signal, and the head switching signal generating circuit 16 outputs the head switching signal.

FIG. 6 shows a recording pattern of a track on a tape recorded in the SD mode. The video signal of one field is segment-recorded on ten tracks,
As shown in FIG. 6, each of the tracks 0 to 9 has an ATF pilot signal in the order of f0, f1, f0, f2, f0, f1, f0, f2,.
Has been converted. The tracks are ITI, AUDIO, VIDEO, SUBCODE from the entrance side of the head.
Data is recorded.

FIG. 8 shows a head configuration used in the SD mode system of FIG. The head for tracing the track is attached at a position 180 degrees opposite to the drum 20. During reproduction, the tape is alternately traced by the L head 3 and the R head 2 for reproduction. The PG 19 generates a drum PG signal as a reference for the drum phase. The track to be traced is controlled by the ATF means. Di
In the ATF system of the gital VCR for Consumer-Use standard, a signal subjected to the 24-25 conversion is regularly recorded so as to have three types of pilot signals f0, f1, and f2 at the time of recording. When reproducing the tape recorded in this manner, the pilot signals of two tracks adjacent to the track being traced are detected, and the capstan motor is controlled so that the level difference between the detected pilot signals is eliminated. Match the phases of the head and the track to be traced.

FIG. 10 shows a timing chart of operation signals and output signals in the reproduction in the SD mode of FIG. In FIG. 10, a frame pulse is a signal whose one cycle represents one frame, a drum PG signal is a signal representing a drum phase reference, and a head switching signal is a signal output at a phase obtained by correcting the drum PG signal with a head phase correction value. H (high) when using the L head, L (low) when using the R head
Becomes The envelope is a signal reproduced and output from the tape.

An automatic head phase adjusting system which can correct the phase relationship between the drum PG and the head by measuring the phase relationship between the drum PG and the head in the system based on the above configuration and the operation thereof will be described below. I do. FIG.
FIG. 5 is a block diagram of a head phase automatic adjustment system in the SD mode system similar to FIG. L
By selecting the head that always traces the tape with the / R head switch 5, the signals recorded on the tracks of the tape are sequentially read to reproduce the envelope. The envelope is amplified by the head amplifier 7 and AT
It is input to the F circuit 9 and the PLL circuit 8. The ATF circuit 9 outputs an ATF ERROR signal, which is input to the capstan phase error calculation circuit 12 in the microcomputer 18 and used for capstan phase control.

[0008] A digital signal is output from the PLL circuit 8, and a processing circuit (not shown) mainly for video and audio systems and an I / O circuit are provided.
TI (Insert and Track Information) synchronization detection circuit 1
Input to 0. When the ITI synchronization detection circuit 10 finds an ITI pattern in the digital signal sequence, it notifies the ITI pattern to the pulse generation circuit 11 and outputs the ITI pulse from the pulse generation circuit 11 to the phase deviation calculation circuit 13 inside the microcomputer. Is input to Since the ITI is to be recorded at a predetermined position on the tape, a head phase correction value is obtained by comparing the phase at which the original ITI pulse is input with the phase at which the ITI pulse is actually input. be able to. By writing the head phase correction value into the memory 14, the phase of the drum PG19 and the head switching signal can be corrected only by reading the correction value from the memory 14 after the adjustment. On the other hand, a drum PG signal is output from the drum 20 as a drum phase reference signal, and is input to the drum phase error calculation circuit 15 in the microcomputer 18 and used for drum phase control. Drum P
The G signal is also input to the phase deviation calculation circuit 13 described above, and is calculated by calculating the phase at which the original ITI pulse is input, and used to obtain the above-described head phase correction value.

FIG. 11 is a timing chart at the time of automatic head phase adjustment in the SD mode. In FIG. 11, a frame pulse is a signal whose one cycle represents one frame, a drum PG signal is a signal representing a phase reference of the drum 20, and a head switching signal is a signal generated with a phase obtained by correcting the drum PG signal with a head phase correction value. And L head 3
It becomes H (high) when used and L (low) when the R head 2 is used. The original ITI pulse phase is a phase calculated by the phase deviation calculation circuit 13 based on the drum PG signal. The envelope is the signal reproduced from the tape. The reproduced ITI pulse is detected by the ITI synchronization detection circuit 10 for the ITI recorded on the tape.
This is a signal generated from.

Next, a reproduction method in the SDL mode of the Digital VCR for Consumer-Use standard will be described. The SDL mode means that the running speed of the tape is 1 /
In this mode, the recording time is doubled with respect to the SD mode while keeping the track width the same as in the SD mode by recording the track once per rotation of the drum by doubling the signal compression ratio and doubling the signal compression ratio.

FIG. 3 is a block diagram of a system corresponding to the SD mode and the SDL mode, and shows a state at the time of the SDL mode operation. In this system, when reproducing in the SDL mode, the head amplifier switch 6 is set to the SDL side by the SD / SDL head amplifier switching signal, so that the SDL mode recording tape can be reproduced. The signals recorded on the tracks of the tape are sequentially read out by selecting the head that is always tracing the tape with the L / R 'head changeover switch 4,
Play the envelope. Note that the L / R head switch 5 is not used. The envelope is amplified by the head amplifier 7 and input to the ATF circuit 9 and the PLL circuit 8. The ATF circuit 9 outputs an ATF ERROR signal, which is input to the capstan phase error calculation circuit 12 in the microcomputer 18 and used for capstan phase control.

A digital signal is output from the PLL circuit 8 and is mainly input to a video and audio processing circuit (not shown). On the other hand, a drum PG signal is output from the drum 20 (see FIG. 9 described later) as a drum phase reference signal, and is input to the drum phase error calculation circuit 15 inside the microcomputer 18 and used for drum phase control.
The drum PG signal is also input to the head switching signal generation circuit 16 described above, and the L / R 'head switching signal is generated based on this signal. The drum PG 19 (see FIG. 9 described later) and the head Since the phase relationship is unknown when the drum is created, it is necessary to correct the phase relationship by measuring the phase relationship between the unknown drum PG and the head, as in the SD mode.

FIG. 7 shows a track pattern of an SDL mode recording tape. The video signal of one field is segment-recorded on five tracks, and each track is f
24-25 conversion is performed so as to have ATF pilot signals in the order of 0, f1, f0, f2, f0, f1, f0, f2,. The track records ITI, AUDIO, VIDEO, and SUBCODE data from the entrance side of the head.

FIG. 9 shows a head configuration used in the system corresponding to the SD mode and the SDL mode shown in FIG. The head that traces the track has one drum
An SD mode head mounted at a position facing 80 degrees and an SD head mounted at substantially the same position on the drum 20
There will be a head for L. During playback of an SD mode recording tape, the tape is alternately traced by the L head 3 and the R head 2 for playback. When reproducing the recording tape in the SDL mode, the tape is traced alternately by the L head 3 and the R 'head 1. The drum PG19 generates a drum PG signal that is a reference for the drum phase.

The principle of the ATF in the SDL mode is the same as that in the SD mode. FIG. 12 shows a timing chart of operation signals and output signals in the reproduction in the SDL mode of FIG. The frame pulse is a signal in which one cycle represents one frame, the drum PG signal is a signal representing a drum phase reference, and the head switching signal is a signal output at a phase obtained by correcting the drum PG signal with a head phase correction value. H (high) when 3 is used, and L (low) when the R 'head 1 is used. The SD / SDL switching signal is fixed at L in the SDL mode. The envelope is a signal reproduced and output from the tape.

[0016]

When the head phase of the R 'head 1 for the SDL mode is automatically adjusted in the system described above, the head phase may be adjusted by the same algorithm as the automatic head phase adjustment of the SD mode. It is possible.
However, this requires a tape recorded in the SDL mode. This means that when a head phase adjustment is performed in a system compatible with the SD mode and the SDL mode, tapes on which SD and SDL recording are performed are required, and adjustment must be performed twice by replacing the tape in the adjustment process of the production line. Means that. The present invention has been made in view of such a problem in the related art, and has means for enabling automatic adjustment of the head phase for the SDL mode by preparing only a tape recorded in the SD mode. Di
It is an object of the present invention to provide a magnetic recording / reproducing apparatus compatible with SD mode and SDL mode conforming to the gital VCR for Consumer-Use standard.

[0017]

According to the first aspect of the present invention, there is provided a rotary head provided with three or more reproducing heads on a rotary drum;
Switch means for selecting one reproduction head from the reproduction heads based on the phase reference signal of the rotary drum and outputting a reproduction signal; and tracking adjustment means for adjusting tape tracking based on the reproduction signal. A head phase adjusting unit that adjusts the phase of the head based on the phase reference signal of the rotating drum, wherein the head phase adjusting unit performs recording / reproduction corresponding to a plurality of modes. Rotates the phase of the signal for phase adjustment inserted at a predetermined position in the signal sequence of the reproduced signal reproduced by the head used for reproducing each of the multiple modes from the signal tape recorded in a single mode The phase is detected as a phase shift with respect to the original phase on a track set based on the phase reference signal of the drum, and the detected phase shift is detected. It is obtained so as to obtain an adjustment value based on.

According to a second aspect of the present invention, in the first aspect of the invention, in detecting the phase shift performed by the head phase adjusting means, a phase which should be originally on a track set based on the phase reference signal of the rotating drum is provided. The switch means is controlled so as to obtain a relationship with respect to the phase adjustment signal contained in the reproduction signal sequence of the head used only for reproduction in each mode.

According to a third aspect of the present invention, in the first or second aspect of the invention, the plurality of modes are set to a digital VCR for consumer.
-Use standard SD mode and SDL mode, and the single recording mode of the signal tape used in the head phase adjusting means is the SD mode.

[0020]

FIG. 1 is a block diagram showing a head phase adjusting system according to an embodiment of the present invention. Hereinafter, this embodiment will be described with reference to FIG. S
The tape recorded in the D mode is reproduced at the running speed of the SD mode. At this time, when reproducing the track with the ATF pilot signal of f0, the SD / SDL changeover switch 6 is switched to the SD side, and the L / R head changeover switch 5 is set to R so that the ATF pilot signal is reproduced. When the tracks f1 and f2 are reproduced, the SD / SDL changeover switch 6 is switched to the SDL side, and the L / R 'head changeover switch 4 is set to R', whereby the reproduction is performed with the R 'head 1. In this manner, the envelope is reproduced from the tape by alternately switching the R head 2 and the R 'head 1 and selecting the head that always traces the tape. At this time, when the track with the ATF pilot signal of f0 is reproduced by the R head 2, the track becomes reverse azimuth, so that ITI, AUDIO, VIDEO, SU
BCODE data cannot be reproduced, but AT
Since the frequency of the F pilot signal is sufficiently lower than the frequency at which the azimuth effect occurs, the ATF pilot signal can be reproduced.

The reproduced envelope is amplified by the head amplifier 7 and input to the ATF circuit 9 and the PLL circuit 8. The ATF circuit 9 outputs an ATF ERROR signal, which is input to a capstan phase error calculation circuit 12 in the microcomputer to be used for capstan phase control. A digital signal is output from the PLL circuit 8 only when the data is reproduced by the R 'head 1, and mainly a video and audio processing circuit (not shown) and an ITI synchronization detection circuit 1
Input to 0. When the ITI synchronization detection circuit 10 finds an ITI pattern in the digital signal sequence, it notifies the ITI pattern to the pulse generation circuit 11 and outputs the ITI pulse output from the pulse generation circuit 11 to the phase deviation calculation circuit 13 inside the microcomputer 18. Is input to Since the ITI is to be recorded at a predetermined position on the tape, the ITI
A head phase correction value can be obtained by comparing the phase at which the pulse is input with the phase at which the ITI pulse is actually input.

By writing the head phase correction value into the memory 14, after adjustment, the phase of the drum PG19 and the head switching signal can be corrected only by reading the correction value from the memory 14. On the other hand, a drum PG signal is output from the drum 20 as a drum phase reference signal.
And is used for phase control of the drum. The drum PG signal is also input to the above-described phase deviation calculation circuit 13, and can be obtained by calculating the phase to which the ITI pulse is originally input.

FIG. 2 is a timing chart at the time of automatic head phase adjustment according to the present invention. The frame pulse is a signal in which one cycle represents one frame, the drum PG signal is a signal representing a drum phase reference, and the head switching signal is fixed at L (low) in this head phase adjustment mode. S
The D / SDL switching signal is a signal output at a phase obtained by correcting the drum PG signal with a head phase correction value, and becomes H (high) in the SD mode and L (low) in the SDL mode. The original ITI pulse phase is a phase calculated by the phase deviation calculation circuit 13 based on the drum PG signal. The envelope is the signal reproduced from the tape. The reproduction ITI pulse detects the ITI recorded on the tape by the ITI synchronization detection circuit 10.
Is a signal generated from the pulse generation circuit 11 when detected.

[0024]

As described above, according to the present invention, the head phase automatic adjustment of the head used for the reproduction of each of the plurality of modes from the signal tape recorded in the single mode is performed in the single mode recording. Because it was made possible with tape, only one type of tape was recorded in single mode,
Only one head phase adjustment process is required on the production line. Also,
Digital VCR for Consumer-Use standard compliant SD mode,
A specific means is provided for realizing phase adjustment with an SD mode recording tape for an SDL mode head of an SDL mode compatible magnetic recording / reproducing apparatus.

[Brief description of the drawings]

FIG. 1 shows a block diagram of a head phase adjustment system as an embodiment of the present invention.

FIG. 2 is a timing chart at the time of automatic head phase adjustment in the embodiment of FIG. 1 of the present invention.

FIG. 3 is a block diagram of a system corresponding to the SD mode and the SDL mode, showing a state at the time of the operation of the SDL mode.

Fig. 4 SD according to the Digital VCR for Consumer-Use standard
FIG. 3 shows a system block diagram of a mode.

FIG. 5 is a block diagram showing a head phase automatic adjustment system in the SD mode system similar to FIG. 4;

FIG. 6 shows a recording pattern of a track on a tape recorded in the SD mode.

FIG. 7 shows a track pattern of an SDL mode recording tape.

FIG. 8 shows a head configuration used in the SD mode system of FIG. 4;

FIG. 9 shows a head configuration used in the SD mode and SDL mode compatible systems of FIG.

10 shows a timing chart of operation signals and output signals in the reproduction in the SD mode of FIG. 4;

FIG. 11 is a timing chart at the time of automatic head phase adjustment in the SD mode.

12 shows a timing chart of operation signals and output signals in the reproduction in the SDL mode of FIG. 3;

[Explanation of symbols]

1 ... R 'head, 2 ... R head, 3 ... L head, 4 ... L
/ R 'head switch, 5 ... L / R head switch, 6 ... SD / SDL switch, 7
... Head amplifier, 8 ... PLL circuit, 9 ... ATF circuit, 1
0: ITI synchronization detection circuit, 11: pulse generation circuit, 12
... Capstan phase error calculation circuit, 13 ... Phase deviation calculation circuit, 14 ... Memory, 15 ... Drum phase error calculation circuit, 16 ... Head switching signal generation circuit, 17 ... SD /
SDL head switching signal generation circuit, 18 microcomputer,
19: drum PG, 20: drum.

Claims (3)

[Claims] 1. A rotating head having three or more reproducing heads provided on a rotating drum, and one reproducing head is selected from the reproducing heads based on a phase reference signal of the rotating drum, and a reproducing signal is output. Switch means for adjusting the tracking of the tape based on the reproduction signal; and head phase adjusting means for adjusting the phase of the head based on the phase reference signal of the rotating drum. In the magnetic recording / reproducing apparatus for performing recording / reproducing corresponding to the above, the head phase adjusting means reproduces a reproduced signal reproduced from a signal tape recorded in a single mode by a head used for reproducing in each of a plurality of modes. The phase of the phase adjustment signal inserted at a predetermined position in the signal train is set to a track set based on the phase reference signal of the rotating drum. A magnetic recording / reproducing apparatus for performing recording / reproducing corresponding to a plurality of modes, wherein the magnetic recording / reproducing apparatus detects a phase shift with respect to a phase which should be originally performed on a disk and calculates an adjustment value based on the detected phase shift. 2. In the detection of a phase shift performed by the head phase adjusting means, a relationship with a phase which should be originally on a track set based on the phase reference signal of the rotating drum is used only for reproduction in each mode. 2. A magnetic recording / reproducing apparatus according to claim 1, wherein said switch means is controlled so as to be obtained by said phase adjusting signal included in a reproducing signal sequence of a head. . 3. The digital VCR for Consistency mode according to claim 1, wherein:
3. The multiple mode according to claim 1, wherein the SD mode and the SDL mode of the umer-Use standard are set, and a single recording mode of the signal tape used in the head phase adjusting unit is set to the SD mode. A magnetic recording / reproducing device that performs corresponding recording / reproducing.