JPS60171686A - Counter device - Google Patents

Abstract

PURPOSE:To enable a normal operation of a tape counter even when a tape control signal is not being recorded by counting a reel pulse signal and a capstan signal, etc. when the reproducing control signal can not be obtained. CONSTITUTION:When a reproducing control signal outputted proportional to a tape travel length from a control head 4 is supplied, a drive pulse is generated from a microcomputer 5 and a tape counter 6 up/down counts according to a travel direction of the tape 3. This computer 5 is supplied a capstan signal corresponding to the number of revolution of a capstan 7 through the capstan 7. This signal is converted into a reproducing control signal and even when this control signal can not be obtained, the counter 6 performs a normal counting operation, thereby enabling the tape counter to operate normally even at a part where the tape control signal is not being recorded. In stead of the capstan signal, the use of the reel pulse proportional to the number of revolution of the reel can obtain the same result.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a counter device for a video tape recorder (VTR).

[Technical background of the invention and its problems]

FIG. 1 shows an example of the configuration of a counter device in a conventional VTR. A tape 3 is wound around a supply reel 1 and a pick-up reel 2, and the tape 3 moves in the direction of the arrow while coming into contact with a control head 4 during recording or playback. Then, the control head 4 receives the control signal (hereinafter referred to as CTL) recorded on the chip 3.
He picks up the ``Gogo''. A CTL signal 100 output from the control head 4 is input to a microcomputer (hereinafter referred to as microcomputer) 5. Normally, the number of CTL signals is constant per unit time, so the microcomputer 5 counts the number of CTL signals, outputs a counter drive signal 200 corresponding to this count value to the counter 6, and outputs the counter drive signal 200 corresponding to this count value to the counter 6. The recording time is displayed on the counter 6. Additionally, since the microcomputer 5 is supplied with a direcciran signal 300 indicating the direction in which the tape 3 is moving, the display on the counter 6 will be up if the tape 3 is moving in the direction of the arrow, and if it is moving in the opposite direction. If so, the display on the counter 6 will go down. In this way, in the conventional counter circuit, the count display of the counter 6 depends only on the CTL signal 100.
There was a drawback that the counter 6 could not be operated if the TL signal disappeared.

By the way, when inserting a video signal into a recorded tape, there is a method of determining the position of the insert based on the display of a counter. In the case of this method, if there is a part where there is no CTL signal within the section to be inserted, it will not be possible to insert a 5-fold video signal into the section you are trying to insert, and the insert end point will be before the set point. There were some drawbacks. The reason for this is as described below (that is, when inserting a video signal, the insert end point is first set, the tape is rewound from there, and the insert start point is set. If there is a part where there is no CTL signal in the insert section, the CTL signal cannot be picked up from that part during rewinding, so the counter does not operate (countdown) in this part.
If a video signal is inserted in a section where there is no signal, and a section where there is no CTL signal appears, some VTRs automatically record the CTL signal on this recorded tape so that their own servo will not be disturbed. At the beginning, before inserting CTL
Because the counter continues to advance even where there is no data, the insert end point of the counter comes before the insert end point set on the tape. These drawbacks are caused by the fact that the counter is operated depending on the quality of the CTL signal.

[Purpose of the invention]

It is an object of the present invention to address the above-mentioned drawbacks, to enable a counter to operate normally even in a portion where no control signal is recorded on the tape, and furthermore, to enable the counter to operate normally even in a portion where no control signal is recorded on the tape, and further to insert the control signal in the section where the video signal is inserted into the recorded tape. To provide a color/coloring device capable of inserting a video signal at a set position even if there is a missing part.

[Summary of the invention]

In the present invention, when a CTL signal cannot be obtained, a reel pulse signal or a capstan FG pulse signal, etc. generated in proportion to the rotation of the reel is counted, and this is used as a CTL signal.
The above object is achieved by employing a 5-counter device that displays the counter without interruption by converting the signal into a count value.

[Embodiments of the invention]

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, with the same parts as those of the conventional example being denoted by the same reference numerals. FIG. 2 is a block diagram showing an embodiment of the counter device of the present invention. The tape 3 supplied from the supply reel 1 is conveyed in the direction of the arrow by the capstan 7 and the pinch roller 8, and is wound up by the pick-up reel 2. At this time, the control head 4 picks up the CTL signal, and this CTL signal Zoo is input to the microcomputer 5. At the same time, a capstan FG pulse signal (capstan signal) 400 obtained by the rotation of the capstan/7 is input to the microcomputer 5. The microcomputer 5 generates a counter drive signal 20 based on the input CTL signal 100 or capstan FG pulse signal 400.
0 is output to the counter 6 to drive this color/return 6. In addition, since the microcomputer 5 is added with the V-Lef 9 Fufu No. 43 300 that indicates the traveling direction of the tape 3, the display on the counter 6 will be up if the tape 3 is moving in the direction of the arrow, and if it is moving in the opposite direction. If so, the display on the counter 6 will go down.

Next, the operation of this embodiment will be explained. Normally, when playing the screen, the rotation speed of capstan 7 and the tape 3
Since the speeds of the tape 3 are proportional to each other, the number of pulses of the capstan FG pulse signal 400 is proportional to the speed of the tape 3. Originally, the CTL signal 100 is proportional to (+-) the speed of the tape 3, so naturally the CTL signal 100
Signal 100 and capstan FG pulse signal 400 are in a proportional relationship. Therefore, the microcomputer 5 outputs the CTL signal 100.
In addition to counting the number of pulses and outputting the counter drive signal 200, it also outputs the capstan FG pulse signal 400.
The number of pulses is also counted, so it is set to 5, and the counter drive signal 200 can also be output based on this capstan FG pulse signal 400, so it is set to 5. In this case, the microcomputer 5 may convert the number of pulses of the capstan FG pulse signal 4oo to the number of pulses of the CTL signal 100 and output the counter drive signal 200; Drive signal 200
You can also output . In any case, the microcomputer 5
When the TL signal 100 is not obtained, the counter 6 can be counted by the capstan FG pulse signal 400, so that the display on the counter 6 does not run out too quickly.

According to this embodiment, even if a portion where there is no CTL signal appears in a mode where the speed of the tape 3 and the rotational speed of the capstan 7 are in a proportional relationship, such as during VTR playback or rewind playback, the
The microcomputer 5 has a capstan FG in addition to the CTL signal 100.
Since the number of pulse signals 400 is counted, the counter 6 can always operate normally. Therefore,
When inserting a video signal into a recorded tape, the operation of the counter 6 will not be interrupted even if there is a part in which there is no KCTL signal when rewinding and reproducing after setting the end point. Therefore, it is possible to prevent problems such as deviation of the set insertion end point from occurring, and it is possible to smoothly insert the video signal.

FIG. 3 is a block diagram showing another embodiment of the present invention. When the tape 3 wound around the supply reel 1 and the pick-up reel 2 moves, for example, in the direction of the arrow in the figure, the control head 4 picks up the CTL signal 100 and outputs it to the microcomputer 5. The microcomputer 5 further includes a reel pulse signal 500 proportional to the rotation of the supply reel 1 and a pulse signal 6 proportional to the rotation of the pick-up reel 2.
00 is input. The microcomputer 5 receives input CT data.
A counter drive signal 200 is output to the counter 6 based on the L signal 100, the reel pulse signal 500 from the supply reel 1, and the reel pulse signal 600 from the pick-up reel 2, and this counter 6 is operated.
0 Travel amount (time amount) is displayed.

Furthermore, a direcciran signal 300 indicating the direction in which the tape is traveling is added to the microcomputer 5, and the counter 6 is controlled so that the display goes up in the direction of the arrow in the figure and goes down in the opposite direction. .

Next, the operation of this embodiment will be explained. Here, the hub diameter of the supply reel 1 and the hub diameter of the pick-up reel 2 are R, the radius of the tape 3 wound around the supply reel 1 is r8, and that of the pick-up reel 2 is rT.
Assuming that the total length L1 thickness of tape 3 is d, the length of the tape wound on supply reel 1 is 18, and the length of the tape wound on pick-up reel 2 is right, the following formula is given from the relationship of the side area of the tape. holds true.

lai shiyr (4R”) ・-(1) A!Td=π
(rj4-R...(2)L=Table 10,...(3) Also, the number of pulses of the reel pulse signal 500.600 obtained in proportion to 20 revolutions of the supply reel and the pick-up reel is rn5. . When tn7, the following equation holds true.

mg/37] r: r7 / rg ・= (4)
Substituting equation (4) into equation (5), substituting equation (62 into Gl') yields a solution for lT (and the following equation).

By the way, as time passes over Δ, the tape length wound on the pick-up reel 2 becomes 772 from lTI, and if the pulses from the pick-up reel 2 and the supply reel 1 at that time are mTkmsk mtt, mgz, then the tape 3 The amount of movement is as follows.

Here, the speed of the tape 3 during recording, V, is Δ] The change in the counter when moving, Δt, is as follows (from the 9th formula, L is the size of the tape (cassette), ■ is the method and mode). Therefore, by calculating the ratio of the number of pulses obtained by rotating the supply reel 1 and the pick-up reel 20 times, it is possible to know the time during which the tape 3 has moved (for example, during recording).

Therefore, the microcomputer 5 calculates the ratio between the two based on the reel pulse signal SOO from the supply reel 1 and the reel pulse signal 600 from the pickup reel 2, and (9)
It is programmed to calculate the amount of movement of the tape 3 from the equation and output a counter drive signal 200.

According to this embodiment, the microcomputer 5 operates the counter 6 based on the reel pulse signal 500 from the supply reel 1 and the reel pulse signal 600 from the pick-up reel 2 in addition to the CTL signal 100. There is an effect similar to that of the embodiment shown in FIG. In this embodiment, the counter display can be performed only from the reel pulse signals 500.600 from the supply reel 1 and the pick-up reel 2. However, the pulse 500.
600 is usually C
It is better to operate the counter 6 using the TL signal 100.
More accurate count values can be obtained.

FIG. 4 is a block diagram of still another embodiment of the present invention. In this example, the microcomputer 5 receives C from the control head 4.
In addition to the TL signal 0, a reel pulse signal 500 proportional to the rotational speed of the supply reel 1 is input, and the other configurations are the same as the embodiment shown in FIG.

Here, it is assumed that the reel hub diameter of the supply reel 1 is R and the diameter of the tape wound around the supply reel 1 is r8j. However, l is a natural number. Now, tape 3 is on supply reel 1.
Assuming that is wound n times, the following equation holds true.

r8. = R+ n d ·= (1) However, d is the thickness of the tape 3. Also, the tape 3 is wound onto the pick-up reel 2 side, the ply reel rotates once, and the radius is r8! Assuming that, the following formula holds true.

r,, = R+ (n 1 ) d ・= (2) Therefore, the amount of change in the radius of the tape 30 is (S) From equation (2), ΔIs
−rs+rst=d−(3).

However, since usually rs〉〉d r51# 152...(4).

Also, if the radius of the tape 30 is rB, the number of pulses of the supply reel 1 obtained when it is embarrassing is m8□, ms Yo (3)
is approximately zero, so it is expressed as m81ζmBi.

After all, when the amount of movement of the tape 3 is small, the supply reel 1 can be considered to be rotating at a constant speed during this period. Therefore, if the number of CTL signals 100 obtained in a certain short time is M, and the number of pulses from the supply reel 1 obtained within the same time is ms, the following relationship holds true.

M = K, ms (5) where K is a coefficient that changes over time. Therefore, the microcomputer 5 receives the CTL signal io
When o can no longer be obtained, the CTL signal 10 is obtained from equation (5).
Since the count of 0 is recorded and displayed on the counter 6, the operation of the counter 6 is not interrupted (Fig. 2,
This embodiment has the same effect as the embodiment shown in FIG. In particular, the calculation by the microcomputer 5 is simplified compared to the embodiment shown in FIG.
Programming can be simplified. In addition, when the microcomputer 5 calculates the count number of 100 CTL signals using equation (6), set M and ms just before the CTL signal stops, set K from equation (6), and when the CTL signal stops, this Use K to add M.

〔Effect of the invention〕

As described above (according to the counter device of the present invention, CT
If the L signal cannot be obtained, the counter can always be operated normally by counting the reel rotation pulse or CAGSTAN FG pulse, etc., and converting this into the CTL signal count value to operate the counter. .

Therefore, for example, in in->no-1 recording, even if there is a portion of the recorded tape in which there is no control signal within the section where the video signal is inserted, the video signal can be inserted at the set position.

[Brief explanation of drawings]

FIG. 4 is a block diagram showing an example of a counter device in a conventional VTR, FIG. 2 is a block diagram showing an embodiment of the counter device of the present invention, and FIG. 3 is a block diagram showing another embodiment of the counter device of the present invention. The configuration diagram shown in FIG. 4 is a configuration diagram showing still another embodiment of the present invention. l...Supply reel 2...Tick-up reel 3...Chi 7' 4...Control head 5--
Microcomputer 6...Counter 7...Capstan 8...Pinch roller agent Patent attorney Rules
Kensuke Chika (1 person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A counter device that counts the amount of travel of a tape wound on two reels arranged at a predetermined interval when the tape travels between the reels based on a control signal reproduced from the tape. When a signal cannot be obtained, a reel pulse signal is generated in proportion to the rotation speed of one or both reels, or a reel pulse signal is generated in proportion to the rotation speed of a cab stun that conveys the tape at a constant speed. A counter device comprising means for counting the amount of tape travel by counting capstan signals and converting the count value into a control signal.