JPS60123180A - Recording device - Google Patents

Abstract

PURPOSE:To improve the joint shooting performance of a recorder for Y/C separation record by resetting a synchronizing signal generator for a fixed period from the record starting time with the pulse given from a pulse generator provided to a rotary drum. CONSTITUTION:A pulse PG obtained synchronously with the revolution of a rotary drum has the same phase as a reference signal REF.S obtained from a synchronizing signal generator 6 in a state where the rotary drum has a satisfactorily state revolving state. Thus an image pickup device is obtained with a fixed relation to the signal REF.S. The timing of the image pickup signal obtained from a camera 7 is controlled by the pulse PG and by resetting the generator 6 itself with the pulse PG since the revolving phase of the drum is delayed as compared with the signal REF.S at a record starting point. The time relationship between the PG and a head is decided unequivocally by the mechanical relationship between them. Therefore it is possible to record the vertical synchronizing signals to a tape with no omission.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording device suitable for application to an ultra-compact camera-integrated video device designed to be highly mobile.

BACKGROUND TECHNOLOGY AND PROBLEMS In the ultra-compact camera-integrated video, which has recently been commercially available and is attracting attention, as shown in Fig. 1, a tape (2) is connected to a rotating drum (1) over an approximately 300-angular range. At the same time, the horizontal frequency fH for driving the camera is made higher than before, so that one field's worth of video signal is recorded on the tape (2) wound within the range of 300 degrees. The rotating magnetic head is a double azimuth head Ha, H
b is used.

FIG. 2 shows an example of a track pattern recorded in this way, in which the tracks indicated by broken lines are blank periods in each field, and each head HaHb is on the tape (2).
This is an area that is not in contact with .

Camera control and phase servo of the rotating drum (1) are performed based on signals obtained from the same synchronizing signal generator provided within the main body of the apparatus.

For example, as shown in FIG.
It is driven and controlled by one output. Signal recording section (
5) has a function of recording at least the image signal output from the video camera (7), and may be a recording-only device or a device capable of recording and reproducing. For this reason, the signal recording unit (5) is supplied with a reference signal RBF-8 for performing phase servo on the rotating drum (11) and a control pulse CTL to be recorded on the tape (2) from the synchronizing signal generator (6). The phase servo is performed so that the output pulse of a pulse generator (PG) provided on the rotating drum matches the reference signal REF-S.

Now, in such a camera-integrated video camera, the tape winding angle is large and the winding torque is large, so the rotation of the rotating drum (1) is limited to the tape (2) for a short time after the start of recording.
Since the tracks Ta and Tb are swung in a direction that lags
The vertical synchronization signal Pv recorded at the beginning of the drum servo is not recorded and may be missing only while the drum servo is disturbed. If the vertical synchronization signal image is missing, the playback screen at the start of the re-recorded scene will be distorted, so good continuous shooting cannot be expected.

In order to solve this problem, conventionally, when recording is stopped or when a pause is started, the force of the tension arm is used to rewind the tape (2) by, for example, 10 tracks, and then the playback mode is automatically set and the retrieval mode is started. (2) Count the control pulses CTL recorded in the head H
The stop mode is set, for example, three tracks before the end of the track where a and Hb have already been recorded, so that the head Ha is always located on the already recorded track when recording starts.

By doing this, the rotating drum (1) will be connected to the tape (
2), even if the vertical synchronizing signal image is supplied and missing during the head idle running period, the vertical synchronizing signal Pv on the already recorded track can be used during such period, so it is possible to continue shooting. There is no problem with the playback screen being distorted.

However, this solution also has one problem.

If the relative speed between the tape (2) and the rotating drum [11] is designed to be faster than the current one, there will be a limit to the amount of rewinding of the tape (2) using the force of the tape tension. In such a case, it is impossible to achieve good continuous shooting even if the above-mentioned means are used.

An example of a method for recording an image signal at a higher relative speed than the current method is a recording method in which a luminance signal and a color signal are recorded on separate tracks, respectively.

This recording method converts the image signal output from the television camera (7) into a luminance signal and a color signal, such as a pair of color difference signals R-Y.
The pair of color difference signals R-Y and B-Y have their time axes compressed to 4, and the red color difference signal R-Y is used in the first half of one horizontal period, and the red color difference signal R-Y in the second half. The blue color difference signals B-Y are arranged on the time axis, and the compressed color difference signals (time division multiplexed transmission) and luminance signals are transmitted using separate heads (Ha and Hb on the upper side). A method in which recording is performed on adjacent tracks. This recording method was devised as a means to obtain high image quality.

□ Y In this kind of 4-separate recording, the frequency to be handled becomes different, so when applying it to the above-mentioned camera-integrated video, the relative speed has to be several times faster than the current one, for example, about 6 times faster. I don't get it. Even when using such a recording method, good splicing is naturally required.

・Y However, in the case of 4-separate recording, the tape speed is fast, so if you use the above method, you will be able to rewind only a few tracks. Therefore, after rewinding, the control pulse CTL must be played back in playback mode. While the head Ha, H
It is impossible to control the servo system so that b occurs several tracks before the end of the existing track.

Therefore, when using this method, in most cases it will go into stop mode at the last existing track.
It is not possible to improve the screen distortion during continuous shooting.

OBJECT OF THE INVENTION Therefore, the present invention improves the continuous shooting of a recording apparatus that performs separation recording.

SUMMARY OF THE INVENTION Therefore, in this invention, in addition to utilizing the above-mentioned means, the rotating drum (
1) Pulse PG obtained from the pulse generator provided in
The synchronizing signal generator (6) is reset by In this way, an imaging signal can be obtained in synchronization with the pulse PG, and since the relationship between the pulse PG and the heads Ha and Hb is always constant, the vertical synchronization signal P can be obtained even when the phase of the rotating drum fil is disturbed. ■It is no longer possible to record data in a state where it is missing.

Embodiment Next, an example of the present invention applied to the above-mentioned camera-integrated video will be described in detail with reference to FIG. 4 and subsequent figures.

When the rotational state of the rotating drum (1) is sufficiently stable, the pulse P obtained in synchronization with the rotation of the rotating drum (1)
G is the reference signal REF obtained from the synchronization signal generator (6)
-S, and an imaging signal is obtained having a certain relationship with this reference signal REF -S. At the start of recording, even if an imaging signal is obtained with a certain relationship to the reference signal RBF -S, the rotational phase of the rotary drum (1) is equal to the reference signal RE.
Since it is delayed from F -8, in this case, by resetting the synchronizing signal generator (6) itself with pulse PG, the timing of the imaging signal obtained from the camera (7) is regulated by pulse PG -J'- Le. Since the temporal relationship between the pulse PG and the heads Ha and Hb is uniquely determined by the mechanical relationship between the two, by appropriately determining the reset timing, it is possible to record on the tape (2) without missing the vertical synchronization signal Pv. can do.

FIG. 4 shows one means for realizing such control, and FIG. 5 is a waveform diagram showing an example of re-recording from a pause state. In the pause state, the rotating drum (1) is in a rotating state and in a state where the speed is not adjusted. Therefore, the pulse PG shown in FIG. 2A is obtained from the pulse generator, and after being delayed by a predetermined time t in the delay circuit 011, this delayed pulse D-PG (FIG. 2B)
is supplied to the gate circuit 0z. Gate circuit a2 is turned on for a certain period of time after recording starts, and therefore,
Recording start pulse RE obtained from the signal recording section (5)
C (C in the same figure) is supplied to a monomultiplier (141) to form a gate pulse GP (D in the same figure) having a predetermined pulse width W.

The gated delay pulse D-PG (E in the figure) is further supplied to the monomulti Q5+ to form the reset pulse PR shown in F in the figure. The provided oscillator Q61 is reset.Therefore, the phase of the horizontal and vertical drive signals formed based on this oscillation output and the reference signal REF-8 supplied to the signal recording section (5) are the same as the phase of the pulse PG. Therefore, the imaging signal obtained from the camera (71) also associated with the PG is output.

Therefore, the delay time t of the rotating drum (old delay circuit) is appropriately determined so that the vertical synchronizing signal pv inserted into the image pickup signal will not be lost even if the rotational phase of the rotating drum 11 is disturbed.

In this example, when the rotational phase is synchronized with the reference signal REF-8K, the vertical synchronization signal image is obtained after a predetermined period has elapsed from the reference signal 1 (EF-S). Even in the case of pulse PG, the delay time t of the delay circuit αB described above is determined so that the vertical synchronization signal image is obtained after the elapse of the predetermined period described above.
(Figure 2G).

During the period when the reset pulse PR is obtained, only the speed servo is working and the phase servo is not working, so the gate pulse G is
The gate period W of P is set to a period of several fields as shown.

In this way, for a certain period from the start of re-recording, the pulse P
Since an imaging signal related to G is obtained, even if the phase of the rotating drum (1) is delayed at the start of re-recording, the vertical synchronization signal pv inserted into the imaging signal will not be missing. Therefore,
This prevents screen disturbances during continuous shooting.

Even if you start re-recording after turning off the power instead of starting good recording from pause mode, the vertical synchronization signal PV will be reset by the above-mentioned reset pulse PR for a period of several fields from the start of re-recording. Therefore, in this case as well, it is possible to prevent screen disturbances during continuous shooting.

As described in detail, according to the present invention, it is possible to improve screen disturbances during continuous shooting with an extremely simple configuration. Therefore, the present invention is extremely suitable for application to a recording apparatus in which the tape relative speed is Y (relatively fast) and performs separate recording as described above.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between a tape and a rotating drum for explaining the present invention, FIG. 2 is a diagram showing an example of its recording pattern, FIG. 3 is a block diagram showing an example of the recording device, and FIG. 5 is a block diagram showing an example of the recording apparatus according to the present invention, and FIG. 5 is a waveform diagram for explaining its operation. (51 is a signal recording section, (6) is a synchronization signal generator, (71
is the camera, 00) is the control circuit, Ha, Hb are the head, P
R is a reset pulse, and PG is a pulse. Figure 2 Figure 3

Claims (1)

[Claims] In a recording device in which a camera and a signal recording section that records image signals obtained from the camera are controlled by the output of the same synchronizing signal generator, the signal recording section is connected to the rotation of a rotating drum provided in the signal recording section. The obtained pulse is delayed by a predetermined period of time, and the synchronizing signal generator is reset for a certain period from the start of recording, and the Takezuka signal is recorded in synchronization with the pulse only during this certain period. recording device.