JPH0554199B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape counter device suitable for repeated playback of a video tape recorder (VTR), for example.

[Conventional technology]

FIG. 3 is a diagram showing a conventional tape counter device. In the figure, 1 is a cassette tape;
It consists of a supply reel 2 and a take-up reel 3, and a magnetic tape 4 is stored therein. A head signal and a control (CTL) signal are recorded as magnetic signals on the magnetic tape 4, and are reproduced by magnetic heads 7 and 6, respectively. The reproduced CTL signal is supplied to the counter device 11 via the signal line 8. On the other hand, the reproduced head signal is supplied to the detection device 15 via the signal line 9a, and from the same device to the counter device 11 via the signal line 9b.

Counter device 11 is connected to display device 12 . Further, the counter device 11 is connected to the operation control device 5 of the VTR by a control command signal line 10a and a tape running direction signal line 10b.

The user performs a repeat playback operation on the counter device 11 using a repeat playback command 14.

Next, the operation will be explained. The head signal magnetically recorded in advance on the magnetic tape 4 is sent to the magnetic head 7.
is reproduced and detected by the detection device 15, and a detection signal is output to the counter device 11 via the signal line 9b. The magnetic head 6 reproduces the magnetically recorded CTL signal and supplies it to the counter device 11.
The CTL signal is counted by the counter device 11 and displayed as a counter value on the display device 12. If the user issues a repeat playback command 14, the counter device 11 issues a repeat playback command to the operation control device 5 via the signal line 10a based on the command. Based on this command, the operation control device 5
Controls the VTR so that it starts playback operation.

As the playback progresses, the counter device 11 changes to the detection device 15.
When receiving a head detection signal from (hereinafter referred to as point b), the counter device 11 instructs the operation control device 5 to rewind, and the VTR starts rewinding.
After that, when the counter device 11 receives a head detection signal (hereinafter referred to as point a), the counter device 11
issues a regeneration command to the operation control device 5, and then
The VTR starts playing. Thereafter, by continuously performing the above operations, the VTR records a on the magnetic tape.
Repeated playback operation from point to point b is performed. Incidentally, the counter device 11 counts the CTL signals regardless of the above-mentioned repeated reproduction operation, increases or decreases the counter value in response to the tape running direction signal from the operation control device 5, and displays the counter value on the display device 12. The display informs the user of the current count value.

[Problem that the invention seeks to solve]

Conventional devices are configured as described above, so as the playback continues for a long time, errors occur in the counter value due to misreading of the count pulse (CTL signal), noise contamination, etc., and accumulate. Therefore, even though a predetermined point is being played back, the counter value will shift and become a different value, so if playback is performed repeatedly, the counter value itself will become meaningless. It was hot.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a tape counter device that can compensate for the count value even if a count error occurs during repeated playback. .

[Means for solving problems]

The tape counter device according to the present invention has a first rewind playback point (point a) during repeated playback operation.
The count value at point A is stored, and as long as the operation is repeated thereafter, the stored value is transferred to the counter value at point a, thereby achieving compensation for the counter value.

[Effect]

In the tape counter device according to the present invention, since the counter value is always reset to the initial value at point a from the second time onward during repeated playback, the counter value is compensated even if the repeated playback operation continues for a long time. To solve the problem that errors in count values increase.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings. The difference between FIG. 1 and FIG. 3 is that the storage device 13 is connected to the counter device 1 via the signal line 16.
1 so that the counter value can be written and read, and the counter device 1
1 writes the counter value at that time into the storage device 13 when point a is detected for the first time, and when point a is detected from the second time onwards, reads out the counter value and uses that value as the current counter value. This is why we decided to count it.

Next, the operation of the above embodiment will be explained with reference to FIG. However, since the operation contents and order control method of the apparatus during the repeated reproduction operation are exactly the same as those of the prior art, they will be omitted and only the differences will be explained.

After the counter device 11 receives the repeat play command 14 and enters the repeat play state, when the rewind play state is first entered at point a, the counter device 11 stores the counter value at that time via the signal line 16 in the storage device. Write to 13. When returning to point a for the second time or later, the counter device 11 reads out the already stored counter value from the storage device 13 and uses that value as the current counter value. Then, the counter value is compensated for during repeated playback. As described above, this operation makes it possible to realize an accurate tape counter device that does not accumulate counter value errors caused by noise or the like even if repeated reproduction is performed for a long time. Note that identification of the number of times of repeated reproduction can be easily realized by providing a circuit such as a dedicated flip-flop in the counter device 11 or by storing it in the storage device 13. Further, generally, a microcomputer is often used as the counter device 11, and in this case, the storage device 13 is built in or attached to the microcomputer, so the device itself can be realized at the same price as a conventional one. This has the effect of not increasing costs.

In addition, although the above example shows the case where it is applied to a VTR, it can also be applied to a magnetic tape recording/playback device (including a playback-only device) such as an audio tape recorder.
Also, the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, during repeated playback of a predetermined section, the counter value is always reset to the initial value at the starting point from the second time onward, thereby making it possible to perform long-time repeated playback. However, since the counter value compensation operation is performed each time for counter errors caused by noise or the like to prevent accumulation of errors, there is an effect that a tape counter device with high counter value accuracy can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a tape counter device according to an embodiment of the present invention, FIG. 2 is a flowchart showing its operation, and FIG. 3 is a block diagram showing a conventional tape counter device. In the figure, 4 is a magnetic tape, 6 is a CTL signal reproducing head, 7 is a head signal reproducing head, 11 is a counter device, 13 is a storage device, and 15 is a detection device. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A magnetic tape playback device that repeatedly reproduces a predetermined section on a magnetic tape on which a head signal and a count signal are recorded, which includes a counter device that counts the count signal, a storage device that stores the counter value of this counter device, and a memory device that stores the counter value of the counter device. A detection device that detects a start point or an end point of a repeat section based on a signal and generates an output signal, and a counter counted by the counter device at the start point of the first repeated playback based on the output signal of the detection device. A value is stored in the storage device, and at the starting point of the second and subsequent repeated playbacks, the value 1 stored in the storage device is stored.
A tape counter device characterized in that a second counter value is transferred to the counter device and reset as the current count value.