JPS63306559A - Magnetic tape recording and reproducing device - Google Patents

Abstract

PURPOSE:To automatically perform a program searching for an ending position of the previous recording by automatically recording a program searching signal at the time of stopping a recording, and automatically detecting the program searching signal to carry out the program searching in the case of making a recording standby mode again. CONSTITUTION:The titled device is equipped with a means for automatically writing the program searching signal into a control signal track 22 of a magnetic tape 30 at the time of stopping the recording, a means for automatically retrieving the written program searching signal for the program searching when the recording standby mode is effective, a means for erasing the written program searching signal subsequently by rewinding forward the magnetic tape 30 and a means for setting the VTR under the pausing condition of recording after the erasing operation. By this method, it is only need for the recording standby mode after stopping a recording to automatically carry out the program searching for a stopping position of the previous recording, followed by the pausing state of a new recording which can hence be performed successively.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a magnetic tape recording/reproducing device (hereinafter referred to as rVTR).
Specifically, the present invention relates to a cueing device for the position at which the recording operation is stopped. [Prior Art] Figures 3 and 4 are diagrams showing the running path of a magnetic tape employed in a conventional VH3 type VTR, and Figure 3 shows the tape running path during recording and playback (loading state). Figure 4 is a diagram showing the tape running path during rewind and fast forward operations (half-loading state). In Figure 0, (15) is a rotating drum equipped with two video heads, and (1B) is a Full-width erasing head, (17) is an audio signal/control signal head, (18) is an audio erasing head, (18) is a pinch roller, [20] is a capstan, and (40) is a magnetic tape. In the VTR configured as described above, magnetic tape (30
) is wound around a rotating drum (15) as shown in Figure 3 during recording and playback, and includes two video heads, a full-width erasing head (18), an audio signal/control signal head (17), and an audio erasing head. (18), each head performs its own operation, and during one rewind or fast forward operation, the audio signal is transmitted as shown in Figure 4.
The vehicle travels at high speed in a half-loaded state in contact with the control signal head (17). In conventional VTRs, when searching for a specific recording position on the magnetic tape (40) during rewinding or fast forwarding, the VH9 standard (VH321) takes the following measures. The recording format on the magnetic tape (40) is a video signal track (21) as shown in FIG. It consists of an audio signal track (20) and a control signal track (22), and the control track (22) is used to search for a recording position. This control track (22) has a magnetic tape (
In order to keep the traveling speed of 40) constant, a hunt roll signal (20 (shown in Fig. 6 (b)) is recorded based on the vertical synchronization signal (23) (shown in Fig. 6 (a)) of the television signal. A current is applied to the control signal head (17) based on the falling point of the vertical synchronization signal (23), and the control signal (20)
It is recorded as 0 on the control track (22). In the data recording system of the VH5 standard, a '0' pulse and a '1' pulse are defined by changing the duty ratio of this control signal (20).
), when the duty ratio is 60±5%, it is “0”.
Pulse (25), as shown in the same figure (b), 25 to 30
% is a “1” pulse (2B), and the data format of this control signal (20) is as shown in FIG.
The cue code (27) is '
61±3 bits of l" are written with 0" as both ends, and the writing time is about 2.1 seconds in the NTSC system, and the first "θ" of writing is used as the reference position for cueing. In addition, as shown in the same figure (b), the address code (28) is written three times in 4-bit BCD 4-digit data (30) with the 11-bit header (29) at both ends, and the write time is N.
In the TSC method, it is approximately 3.11 seconds. In addition, in the header (28) of this address code (2B), as shown in Figure-(C), 9 bits of "1" are written with "O" at both ends.
Data (30) is written in 4-bit BCD code,
The 4-digit scale shall be 1,000, 100, shi, - in the order of writing.

[Problems to be solved by the invention] Since the conventional VTR cueing system is configured as described above, a cueing signal can be written at any position. However, if you want to cue up the recording stop position, you must write a cue signal after stopping recording, and if you want to resume recording following the recording stop position, you can write the cue signal at the cue signal position or the cue signal. There is a problem in that the handling is complicated for the operator, such as having to specify the address of the computer to perform the cueing operation. This invention was made to solve the above-mentioned problems. After recording is stopped, simply by switching to recording preparation mode, the previous recording stop position is automatically retrieved and recording is paused. The object of the present invention is to obtain a VTR that can perform subsequent recording operations. [Means to solve the problem]

The VTR according to the present invention includes a means for automatically writing a cue signal to a control signal track of a magnetic tape when recording is stopped, and a means for automatically searching for the written cue signal to cue when the recording preparation mode is set. Then, the magnetic tape is moved forward to erase the written cue signal, and after the erasing operation, the VTR is set to a recording pause state. [Function 1] The cue signal writing means of the present invention automatically records a cue signal on the control track of the magnetic tape when the recording operation is stopped. The zero cue signal erasing means performs cueing by searching for the written cueing signal, and after cueing, erases the written cueing signal while moving the magnetic tape forward. The means for setting the recording pause state sets the VTR to the recording pause state after the erasing operation is completed. [Embodiments of the invention]. The hardware configuration of the VTR according to the present invention is similar to the conventional VTR described in FIGS. There are nine points of difference in that a microcomputer is provided for controlling i# in order to cause the VTR to perform the operation and the operation of erasing the cue signal. Below, VT by the microcomputer according to this invention
An example of operation control of R will be described. FIG. 1 is a flowchart of the cue signal writing operation when recording is stopped in this embodiment, and FIG. 2 is a flowchart of the cueing operation when the recording preparation state is set. First, the VTR is in recording mode or recording pause mode.
If the stop button is pressed in step l or the reservation is completed, mute recording is performed for 5 seconds in step 2. If the magnetic tape ends in step 3 during mute recording, an error signal is output in step 4. and exit. If NO in step 3, a cue signal (27) is written in step 5 following mute recording. This cue signal (27) is a recording signal indicating that recording has ended. After the writing of the cue signal is completed in step 6, the recording mode is canceled in step 7, and the recording operation is completed. Next, if the recording operation is to be performed again after this recording operation is completed, the recording preparation mode is set in step 8. When the recording preparation mode is entered, the VTR is put into fast forward mode in step 1O and a cue signal is detected.If the cue signal cannot be detected, the cue signal is detected in step 11. If the signal (27) cannot be detected, the process ends. If the cue signal (27) is detected in step 10 or step 11, the magnetic tape (40) is moved forward in step 12 to erase the cue signal (27), and then in step (13) for 3 seconds. Performs the previous reversal, and in step 14 puts the VTR in a recording pause state, allowing it to continue recording from the previous recording, and ends the process.In this way, the writing operation of the cue signal when recording is stopped is performed by the microcomputer. , cueing operation during recording operation, and erasing cueing signals. In addition, when performing a forward movement, the operator can continue the recording operation from the previous recording end position without performing any special operation, and the operator can continue the recording operation from the previous recording end position without performing any special operation. Since the output signal is erased, no record remains on the magnetic tape. In the above embodiment, a cue signal is written after recording is completed,
Although the recording is paused at the position of the cue signal recorded in the recording preparation mode, the recording may be paused from any relative cue signal or absolute cue signal. Note that the cueing code of the cueing signal written when recording is stopped may be a unique one that does not conform to the VH5 unified standard. [Effects of the Invention] As described above, according to the present invention, a cue signal is automatically recorded when recording is stopped, and when the recording preparation mode is entered again, the cue signal is automatically detected and the cue signal is automatically recorded. At the same time, the corresponding cueing signal is erased and the recording is temporarily stopped, so that there is an effect that a VTR can be obtained that can automatically cue to the last position recorded last time.

[Brief explanation of drawings]

FIG. 1 is a flowchart of a cue signal writing operation when recording is stopped according to an embodiment of the present invention, FIG. 2 is a flowchart of a cueing operation when preparing for recording, and FIG. 3 is a tape running operation during recording and playback of a VTR. Figure 4 is a diagram showing the tape running state (at half loading) during rewinding and fast forwarding, Figure 5 is a diagram showing the track pattern of the magnetic tape, and Figure 6 is a diagram showing the magnetic tape track pattern. Timing diagram of vertical synchronization signal and control signal, Figure 7 is VH5
FIG. 8 is a diagram showing the duty ratio of "O" and "1" of standard unified codes, and FIG. 8 is also a diagram showing the code structure of the cue code, address code, and header. (22)...Control track, (27)...
・Cueing code, (40)...Magnetic tape. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A means for writing a cue signal into the control signal track of the magnetic tape when the recording operation is stopped, and then reading out the written cue signal by performing a fast forward/backward operation when the recording preparation mode is set. A magnetic tape recording and reproducing device comprising means for performing a cueing operation by moving the magnetic tape forward, means for erasing the read cueing signal by moving the magnetic tape forward, and means for placing a recording pause state after erasing the cueing signal. .