KR900005067B1 - Pilating system of video tape quantity - Google Patents

Abstract

The circuit displays the remaining quantity of the video tape with the time. Counters (1,2) count the reel pulse. The output of the counter (2) is multiplied to 11.11 by a multiplier (3). The moving distance of the tape is calculated by multipliers (5,6) and converted to the tape diameter by a divider (7). The turn number (IV) of the tape is calculated by a divider (8). The remaining tape length (L) is calculated by an accumulating adder (10) and converted to the time (T) by a multiplexer (14). The multiplying or dividing constants are different according to the tape speed mode.

Description

Video tape remaining display

1 is a configuration diagram of a video tape remaining amount display device of the present invention.

2 is an explanatory diagram showing a reel of a tape wound for explaining the present invention.

3 is a signal flow diagram for FIG.

* Explanation of symbols for main parts of the drawings

1,2: counter 3,5,6: multiplier

4,14: Multiplexer 7,9,13,15,16: Divider

8 subtractor 10 cumulative totalizer

11: multiplier 12: adder

The present invention is to display the remaining amount of tape in the video tape recorder, and especially the remaining amount of video tape display so that the remaining amount of the remaining tape can be displayed in terms of time automatically when the tape is transported without any additional data input. Relates to a device.

In general, a tape remaining indicator will be needed to see how much time you have remaining on your tape, so you can see how much tape is wound on the reel after attaching a transparent plate to the case of the video tape. There was a method of estimating the remaining state and time generally, and a tape counter that changes with the transfer of the tape is installed outside the video tape cassette recorder to estimate the remaining amount or time of the tape. However, in this case, the time division criteria for each mode are different, and it is almost impossible to calculate the time by looking at the remaining amount of tape, and there is approximately "half of the whole" or 1/3 remaining amount. Since it is only known to the extent, it is not a practical indication of the remaining amount.As an improved method, the tape is suggested in a method of setting a division criterion by the user inputting a length and a starting point for each mode in advance, but if the length of the tape is unknown, There was a problem that the calculation was impossible, and if the input was different from the actual length, an incorrectly calculated remaining amount was displayed.

In order to solve these problems, the present invention, when the tape is transported and the reel is rotated, the amount of remaining tape after converting the remaining amount of the remaining tape to time based on the currently selected mode (ST, LP, EP) It will be devised to automatically display the time all are transported, when the present invention will be described in detail by the accompanying drawings as follows.

FIG. 1 is a block diagram of a video tape remaining amount display device of the present invention. As shown in FIG. The counter 1 that counts the number of pulses and sets or resets the pulse according to the reel pulse output from the counter 1 receives the number of control pulses generated when the reel is rotated from the control pulse terminal STL. A counter 2 to count, a multiplier 3 that multiplies the output signal of the counter 2 by 11.11 times, and outputs a standard play SP, a long play LP and a wing. A multiplexer 4 for selectively outputting to the output signal of the multiplier 3 according to the Extended Play (EP) mode signal, and outputting the output signal of the multiplier 3 when the tape is in standard play (SP) mode. Tape from the multiplexer 4 multiplied by 3 times A multiplier 6 for calculating the conveying distance 1 and a divider for calculating the conveying distance 1 of the tape by multiplying the output signal of the multiplier 3 twice when the tape is in the long play (LP) mode. (7) and a subtractor (8) which subtracts the diameter (D) of the reel hub from the diameter (Xn) of the tape divided by the divider (7), and an output signal subtracted by the subtractor (8). A divider 9 for calculating the number of turns N of the tape actually wound by the thickness, a multiplier 11 for multiplying the tape thickness by an output signal value of the divider 9, and the multiplier ( An adder 12 which calculates and outputs the diameter D of the hub and multiplies the output signal multiplied by 11), and the number of turns N of the tape currently wound by the divider 9 and the current reel by the adder 12 The cumulative totalizer 10 for accumulating and summing the diameter Xn of the tape wound on the tape, and the output signal of the cumulative totalizer 10 is 11.11 times. And a multiplexer 14 for selectively outputting the output signal of the divider 13, the output signal of the divider 913 according to the standard play (SP), long play (LP), and extended play (EP) mode signals; Dividers 16 and 15 for dividing the output signal of the divider 13 in the standard play (SP) and long play (LP) modes by 3 or 2, respectively, and the divider 13 ( 15) The signal divided by the 16 outputted by the output buffer 17 is configured to be applied to the display terminal DIN connected to the display unit.

Referring to the effects of the present invention configured as described above in detail.

When the tape is conveyed, the reel is rotated so that the reel pulse is applied to the reel pulse terminal RIN, and the control pulse recorded on the track of the tape is applied to the control pulse terminal CTL. The counter 1, which has a reel pulse as an input, counters the number of pulses generated when the reel is rotated once, sends pulses to the digital counter 2 once, and resets the counter 2. The number of control pulses input during this one revolution is counted and multiplied by 11.11 mm, which is the distance between the control pulses, in the multiplier 3 and output. In other words, multiplying the distance between control pulses by the number of pulses generated during one revolution of the reel calculates the feed length (1) of the tape in the multiplier (5) and 6 when the reel is rotated. When the number of control pulses output from the digital counter 2 is multiplied by the multiplier 3 with 11.11 mm, the distance between the control pulses, the reference distance of the extended play (EP) mode is calculated and applied to the input terminal of the multiplex 4. do.

In this case, the reference distance value of the extended play (EP) mode is selected according to the standard play (EP), long play (LP), and extended play (EP) mode signals applied to the multiplexer 4 to change the output value. This is because the distance between the control pulses is different for each mode.

이고, 롱플레이(LP) 모드이 경우는

㎜, 익스텐드 플레이(EP) 모드이 경우에는

㎜이므로 만일 멀티플렉서(4)에 스탠다드 플레이(SP) 모드신호가 인가되면 멀티플렉서(4)는 곱셈기(3)의 출력값을 3배의 곱셈기(6)로 출력시켜 여기서 익스텐드 플레이EP) 모드를 기준으로 2배의 테이프 이송거리(1)가 계산되어 출력된다. 상기 신호는 현재 모드에서 릴의 1회전당 테이프 이송거리(1)를 정확히 계산할 것이고, 만약 현재 릴에 감긴 테이프의 직경(릴 중심으로 부터)을 Xn이라 하면 릴의 1회전당 테이프 이송거리(1)는 1=

·Xn이 된다.In other words, the distance between control pulses in the standard play mode

In the long play (LP) mode

Mm, in the case of the extended play (EP) mode

MM, if the standard play (SP) mode signal is applied to the multiplexer 4, the multiplexer 4 outputs the output value of the multiplier 3 to the multiplier 6, which is based on the extended play EP mode. The double tape feed distance 1 is calculated and output. The signal will correctly calculate the tape feed distance (1) per revolution of the reel in the current mode, and if the diameter of the tape wound on the reel (from the center of the reel) is Xn, the tape feed distance per revolution of the reel (1 ) Is 1 =

Xn is obtained.

Here, if the diameter of the hub at the center of the reel is D and the number of turns of the tape wound at the hub is N, the diameter (Xn) of the tape currently wound at the reel is D + 40N.

이다.That is, the present tape total diameter is a value obtained by adding the diameter of the remaining amount of tape to the diameter of the reel hub (the tape thickness is 20 μm, so the number of turns is 2 × 20 μm). Therefore, the diameter (Xn) of the tape currently wound on the reel is

to be.

In this way, the output value of the divider 7 becomes the total diameter Xn of the tape currently wound on the reel, where the diameter D of the reel hub excluding the tape is subtracted by the reducer 8 to divide the divider 9 When applied to the divider (9) divides the output value calculated by the subtractor (8) by the tape thickness to calculate the number of turns (N) of the tape on the actual reel and apply to the accumulator (10) and multiplier (11) ) Is applied to the input. Therefore, the multiplier 11 multiplies the number of turns N of the tape wound on the reel by the tape thickness (0.044 mm) and sends the result to the adder 12. The multiplier 12 reels the output value calculated from the multiplier 11. The diameter (D) of the hub is added to sequentially apply the diameter (Xn) of the tape currently wound on the reel to the accumulator (10).

의 값을 누적 계산한다.Therefore, the accumulator (10) receives the turn number (N) of the tape discontinuously applied from the calculator (9) and the diameter (Xn) of the tape applied discontinuously from the adder (12) until the stop signal comes in. Remaining tape length

Accumulate the value of.

(Where Σ is the cumulative sum up of the value discontinuously input to the accumulator 10 until the stop signal is received.)

이 되므로 현재 남은 테이프의 총 길이(L)가 된다.The value is

This is the total length of the remaining tape (L).

In this case, when the remaining length L of the tape is input to the divider 13 and displayed as time, the remaining time T of the tape is

The feed speed of the tape is 11.11 mm / sec in the extended play mode, so the remaining time

Becomes

Therefore, when the remaining tape length L of the accumulator summer 10 is divided by the divider 13 as described above, the extended play (remaining time T value based on the EP0 mode) is applied to the multiplexer 14. Converted according to the standard play (SP) mode, long play (LP) mode, and extended play (EP) mode signals, that is, the tape in the case of the standard play (SP) mode by the multiplier (5) 6 described above. The feed rate of is 3 times, and the long plate (2 times in the LP mode), so that the current mode is the standard play (SP) mode divider 16 to 3, the long play (LP) mode divider (15) Is divided by 2 again and converted to time for the remaining amount in the current mode, and this value is displayed for the user to know on the display through the output buffer 17.

As such, the present invention is to notify the user of the current remaining amount of time immediately when the reel is rotated under any amount of tape, and can solve the inaccuracy and the complexity of use as in the prior art and provide reliability. It has convenient features.

Claims (1)

In the VCR tape remaining amount display device, a counter 1 that counts the reel pulses generated by the reel rotation by a predetermined number, and is set / reset according to the output pulse period of the counter 1 to control the number of pulses. The multiplexer 4 selects and outputs a digital value for counting according to the current tape mode, and multiplies the output value of the multiplier 3 by a predetermined number according to the mode selection of the multiplexer 4 to determine the feed distance 1 of the tape. A multiplier (5) (6) for calculating, a divider (7) for converting the tape feed distance (1) of the multipliers (3) (5) (6) to the diameter (Xn) of the tape, and the The subtractor 8 subtracting the diameter D of the reel hub from the diameter Xn of the tape divided by the diffuser 7, and the number of turns N of the tape actually wound by dividing the output value of the subtractor 8 by the tape thickness. A multiplier 9 for calculating the multiplier 9 and a multiplier 11 for multiplying an output value of the divider 9 by a tape thickness. The adder 12 which adds the diameter D of the hub to the output value of the multiplier 11, the tape turn number N value of the divider 9 and the tape diameter Xn of the adder 12 are inputted. The cumulative totalizer 10 accumulatively calculates the remaining tape length L until the stop signal is received, and the remaining tape length value of the accumulator 10 is changed to the remaining amount time T value according to the mode. And a multiplexer (14) and a divider (13) (15) and (16).

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