JPH054388U - Insert recording controller - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent malfunction of tape running control and mute malfunction during playback when there is a non-recorded portion on the tape during the insert recording period. [Configuration] Detecting the presence or absence of a control signal (1
1) In the unrecorded portion, control signals are recorded at intervals of a predetermined period (12). That is, a period for recording the control signal and a period for not recording the control signal are alternately arranged. Then, at the end of the period for recording the control signal, a predetermined number is subtracted from the count value of the tape counter (14).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a control device for controlling insert recording for newly recording an image on a magnetic tape which has already been recorded.

[0002]

[Prior Art]

 Conventionally, a video tape recorder has been put into practical use, which realizes insert recording for partially recording a new video signal on a tape on which a video signal has already been recorded. Insert recording basically controls the phase relationship between the tape running and the rotary head based on the control signal already recorded, so that the connection between the already recorded video signal and the newly recorded video signal becomes unnatural. This is a method of recording so that it will not happen. That is, the video signal and the audio signal are recorded while the control signal related to the already recorded video signal is reproduced, and the control signal is not usually recorded.

Since it is an insert, a new video signal is recorded on a part of the tape where the video signal has already been recorded. Therefore, in the insert recording, the operation start point and the operation end point are determined. For this setting, for example, the following method is used.

That is, first, the target magnetic tape is reproduced and the end set point is searched for while monitoring, and the end set point is set. From there, rewind the tape and play it back. While monitoring, search for the operation start point and set the operation start point. At this time, the video tape recorder counts and stores the number of control signals from the end set point to the operation start point, and also stores the value of the tape counter at the operation start point. When actually performing insert recording, the tape is run in the playback state from a position before the operation start point, and the tape counter (which counts the playback control signal) detects when the tape has reached the operation start point, Start recording video and audio signals. When the control signal is reproduced for the stored count value from the operation start point, the insert recording operation ends.

At this time, the tape counter is of a type that counts control signals, but at the time of reproduction, it counts the reproduced control signals, while at the time of recording, it counts the control signals to be recorded. It is supposed to do. This is because the value displayed by the counter must be changed according to the running of the tape even during recording.

Since the insert recording mode is basically the recording mode, the control signals to be recorded are counted. Even in this case, if there is no unrecorded portion (the control signal is not recorded) in the insert recording period, it is considered that the reproduced control signal and the recorded control signal are the same, so there is no problem.

[0007]

[Problems to be solved by the device]

 By the way, in the above case, if there is a non-recorded portion in the insert recording period, the following inconvenience occurs. 1) The operation end point is not the one scheduled. 2) As a result, since there is no control signal in the non-recorded part, even though there is insert-recorded information, a device that performs mute operation depending on the presence or absence of a control signal is normally a VTR. It is provided). 3) It may be possible to detect the absence of the control signal and change to the mode for recording the control signal. However, this causes a problem in the setting of the recording mode.

Such problems will be further described with reference to FIG. 2A corresponds to the problem 1. If there is a non-recorded portion (hatched portion is already recorded) during the insert period, the operation end point will come before the end set point. This is because the insert period is determined by counting the playback control signal when determining the operation start point by review playback from the end set point, but of course the control signal is not recorded in the non-recorded part. The stored count value is shorter than the actual tape travel distance. On the other hand, at the time of insert recording, the control signal to be recorded (it is generated in relation to the vertical synchronizing signal of the video signal to be recorded, so it occurs without interruption even in the non-recorded portion) is counted. The end point becomes as shown in FIG. The same applies to the case of FIG. 2B.

FIG. 2C corresponds to the above 3). This is the case when there is an unrecorded part between the operation start point and the end set point, and the recording mode (tape speed) is changed across this unrecorded part. When an unrecorded part is detected using such a tape, if the device performs processing to change to the recording mode, the recording operation is executed without changing the mode until the operation end point. Become.

[0010]

[Means for Solving the Problems]

 In order to solve the above problems, in the present invention, in the insert recording mode, when the non-recorded portion is detected by the lack of the reproduction control signal, the control signal is recorded every predetermined period for a fixed period. The operation is repeated.

[0011]

[Action]

 That is, when the non-recorded portion is detected depending on the presence or absence of the reproduction control signal, the control signal is recorded at a predetermined interval. As a result, it can be prevented that no control signal is recorded during the non-recording period, and there is also a period during which the control signal can be reproduced, so that the timing of changing the recording mode is delayed as in the conventional example. Also disappears.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart for explaining the operation, FIG. 3 is a block diagram showing the configuration of the embodiment, and FIG. 4 is an explanatory view of the operation.

In FIG. 3, 1 is a rotary cylinder, 2 is a tape, 3 is a cassette for housing the tape, 4 is a servo block, 5 is a system control circuit configured by a microcomputer, and 6 is a control head.

There are two signal lines between the control head 6 and the servo block. The control signal to be recorded is supplied from the servo block 4 to the control head 6 during recording, and the reproduction control signal is reproduced from the control head during servo reproduction. Given to rock. The syscon 5 outputs a control signal for controlling the servo block 4 and mechanism. Then, the control signal from the servo block is obtained as an input.

As described above, the control signal to the system control is a reproduction control signal at the time of reproduction, but at the time of recording, it is a control signal to be supplied to the control head for recording.

The operation of the insert recording device is realized by a program of a microcomputer. Next, the operation of this program will be described with reference to FIG. When the operation start point is reached and the insert recording operation is started, processing (11) is performed to determine whether or not the control signal is detected. Then, when the non-recorded portion is not detected, the normal insert recording operation is performed (if the non-recorded portion is detected first, the state is reset) (13). The control signal detection process (11) and the following operations are repeated until the end set point is detected (15) or a mode transition instruction is issued (16).

When the control signal is no longer detected and a non-recorded portion is reached, the control signal is written for the β period and the operation of not recording the control signal for the next α period is repeated (12). In actuality, a control signal is supplied from the microcomputer to the servo block so that it is at H level for β period and at L level for α period. After the end of the β period, the count value of the tape counter is decreased by a predetermined value (14).

After the counter prohibiting process, the end point is checked and the mode transition is checked, and the process returns to the control signal detecting process. If the non-recorded portion continues, the process proceeds to the processing of 12 and 14 again. However, once non-recording is detected, a no-recording detection flag is set, and this flag will not be reset unless the α period elapses after the β period ends (after the counter prohibition process), so this flag is set. During this period, the substantial processing of 12 and 14 is not performed.

That is, the control signal detection process is performed during the α period. If the control signal is detected, the process 13 will be executed. On the other hand, if the control signal is not yet recorded after the lapse of the α period, the processing of 12 and 14 is executed to record the control signal and correct the count value of the counter. Then, this operation is repeated.

The correction value of the count value of the counter is automatically determined by the tape speed and the length of β period. Since the end set point is checked after this process, it is possible to prevent the operation of the tape running control due to the writing of the control signal during the β period.

Further, although the control signal is recorded intermittently (see FIG. 4), there is no fear that the video signal or the like will be muted when this portion is reproduced. Conversely, the periods β and α are set in consideration of the mute operation. In other words, the cycle is set so that muting is not applied during playback.

[0022]

[Effect of the device]

 As described above, according to the present invention, it is possible to prevent malfunction even when there is a non-recorded portion during the insert period, which is effective.

[Brief description of drawings]

FIG. 1 is a flowchart showing an operation of an embodiment.

FIG. 2 is an explanatory diagram illustrating a problem of a conventional example.

FIG. 3 is a block diagram showing a configuration of an example.

FIG. 4 is an explanatory diagram showing the operation of the embodiment.

[Explanation of symbols]

 1 rotating cylinder 2 tape 3 cassette 4 servo block 5 system control circuit 6 control head 11 control signal detection process 12 control signal recording process 13 insert recording process 14 count prohibition process

Claims (1)

[Claims for utility model registration] 1. A non-recorded portion is detected by the presence or absence of a control signal in an insert recording control device for recording a new video signal on a portion of a tape on which a signal has already been recorded. An insert recording control device, comprising: a means for performing control and a means for alternately providing a period for recording a control signal and a period for not recording a control signal in a non-recording portion.