KR920002584B1 - Tape volume dectecting device for vtr - Google Patents

Abstract

The apparatus includes an input port (A1) for receiving pulse signals of a supply reel part and pulse signals of take-up reel part. These pulse signals are transferred through a pulse counter (A4) to a system controller (A7), while a frequency which is generated by a clock signal generating section (A2) is frequency- divided by frequency dividers (A3)(A5) so as for the signals to serve as reference clock signals. These reference clock signals are supplied to both the system controller (A7) and to a timer section (A6). A ROM (A8) which is connected to both the system controller (A7) and a data bus is also connected to both an adder (A10) and an output port (A12), while light emitting diodes (LD1- LD8) are connected to the output port (A12).

Description

VTR tape remaining detection display device and method

1 is a detailed circuit diagram of the main portion of the remaining tape display device for explaining the present invention.

2 is a flow chart showing a method for detecting the remaining tape amount to realize the present invention.

3 is a characteristic diagram showing a time-variation difference state between a tape supply reel and a take-up reel.

4 is a state diagram showing the actual tape remaining time on the display according to the present invention.

* Explanation of symbols for main parts of the drawings

A1: input port A2: clock signal generator

A3: Dispenser A4: Pulse Counter

A5: divider A6: timer

A7: system control unit A8: ROM

A9: RAM A10: Accumulator

A11: Operation Control Unit (ALU) A12: Output Port

A13: display unit LD1-LD8: light emitting diode

S.Reel: Supply Reel T.Reel: Take Up Reel

The present invention provides a video tape recorder (VTR) according to a method of detecting the remaining amount of tape using the relative rotation period of the supply reel and take-up reel of the tape of the video cassette during playback or recording, and the remaining detection amount of the detected tape amount. It is an object of the present invention to provide a display control device that can be displayed sequentially so that a user can easily recognize the same.

Specifically, when the signal generated according to the rotational speed (rpm) of the supply reel of the cassette tape and the signal generated by the rotational speed of the take-up reel are changed from low to high, The time until the low and high transition time is calculated in real time, and the remaining time of the calculated tape is compared with the data already stored to determine whether the remaining capacity of the tape is determined. The remaining data is intended to be displayed sequentially through the display.

In general, the means for displaying the remaining amount of tape during playback or recording in a video tape recorder is mainly a means for displaying the remaining amount by connecting a mechanical relay to a flywheel rotated by a capstan motor, or by rotating the hub. Means for comparatively detecting and displaying a photoelectric signal detected by the above are known.

According to the method for detecting the remaining amount of tape by the above means, if there is a drawback that the counter operation is performed from the moment of being operated in the mechanism of reproducing or recording the video tape recorder regardless of the actual remaining amount of tape, the type of tape and Since the counter is executed regardless of the hub radius and the thickness of the tape, there is a problem in that the exact amount of remaining tape is unknown.

Accordingly, an object of the present invention is to provide a method of eliminating this drawback and comparing the remaining tape amount according to the rotational speed detected by the supply reel unit with data programmed according to the type of tape, hub radius and tape thickness. .

Another object of the present invention is to provide a display control device which allows a user to easily identify according to a signal in which the remaining amount of tape is detected by the detecting means.

Hereinafter, the configuration will be described in detail with reference to the accompanying drawings.

FIG. 1 is a detailed circuit diagram of the main part showing the tape residual amount detection system of the present invention, and connects the pulse signal generated from the supply reel unit and the pulse signal generated from the take-up reel unit to be applied to the input port A1. Is connected to the system control unit A7 via the pulse counter unit A4, and a frequency of a predetermined period oscillated from the clock signal generator unit A2 is divided as the reference clock divided by the divider units A3 and A5. The clock signal is supplied to the system controller A7 and the timer A6, respectively, and the ROM A8 connected to the system controller A7 and the data bus connects the timer A6 and the accumulator A10. It is also connected to the RAM (A9) connected by a data bus, and the accumulating unit (A10) and the output port (A12) are respectively connected to the data bus around the operation control unit (A11), the output port (A7) in the system control unit (A7) A12), timer A6, RAM A9 ) And the operation control unit A11 are commonly connected as a data bus, and the display unit A13 formed by connecting the light emitting diodes LD1 to LD8 in parallel to each other is connected to the output port A12.

The working effect of the tape remaining amount display apparatus of the present invention configured as described above will be described by way of example. First, in the present invention, the deck mechanism of the video tape recorder is placed in the recording mode (the same operation is also performed in the playback mode). The illustration of the detection sensor that generates the detection speed signal in accordance with the rotational operation of the supply rail or take-up rail of the mechanism will be omitted.

Therefore, when the supply or take-up rail rotates when the video tape recorder is in the recording mode, a speed signal having a period proportional thereto is generated, and the generated signal is inputted through the detection sensor (not shown) of the input port A1. It is input to each supply reel terminal (S. Reel).

Accordingly, the input port A1 converts the detected analog signal into a data signal that can be read by the operation controller A11 and the accumulator A10, and then sends a program stored in the ROM A8 to the system controller A7. The data input by this is temporarily stored in the RAM A9.

At this time, the signal input to the supply reel terminal (S. Reel) and take-up reel terminal (T. Reel) is somewhat different in the period of the signal generated according to the hub radius of the video tape and the thickness of the tape. The hub radius of the video tape and the tape thickness are shown in Table 1 by using the point where the rotation cycle of the take-up reel and the supply reel for rotating the hub of the tape is continuously added or subtracted according to the remaining amount of tape. The remaining amount can be calculated.

In addition, in order to perform such an operation, the present invention sets the data program according to the type of tape, the radius of the hub, and the thickness of the tape in consideration of the prescribed range according to Table 1.

TABLE 1

Therefore, the remaining amount detection signal stored in the RAM A9 is synchronized with the signal when a pulse signal of a predetermined period divided by the oscillation frequency of the clock signal generator A2 is divided into the timer A6. Counter real time.

The time data divided by this counter is transmitted to the accumulation unit A10 through the system control unit A7.

Therefore, if it is assumed that the detected one cycle signal is the first input signal, the detected signal is input to the accumulation unit A10 together with the data input from the system control unit A7 to calculate the result calculated from the operation control unit A11. After outputting to the output port A12, it is in a standby state until the next detection signal is input.

At the same time, the signal of one cycle and the current time data inputted to the accumulator A10 are input to the pulse generation counter unit A4. After counting one cycle signal, the current time and the specified address of the RAM A9 are counted. The counted data will be stored.

In addition, the data necessary for the determination of the tape type and the remaining amount is stored in the ROM A8 in accordance with the VHS standard, and is required by the system controller A7 when calculating in the operation control unit A11 and the accumulation unit A10. Only data transferred to RAM A9 is used, and in a situation where play or record continues, only data transferred to RAM A9 is used.

Therefore, the time from the point at which the pulse generated at the supply reel unit and the pulse generated at the take-up reel unit to the input port A1 changes from the signal ＂L＂ to ＂H＂ of each pulse is input in real time. Calculate.

Thus, the relationship between the calculated time and the remaining amount of tape is matched with the corresponding remaining amount stored in the ROM A8 and the display portion A13 to be driven, and then the display portion A13 through the output port A12. The light emitting diodes LD1-LD8 are sequentially driven (time difference according to the remaining tape level) to inform the user of the remaining amount of tape.

The display of the light emitting diodes LD1-LD8 substantially depends on the remaining amount of tape.

TABLE 2

Becomes

Here, if the tape type T-120 is selected and driven, all of the light emitting diodes LD1-LD8 are turned on in the initial state, and then turn off sequentially as the driving time elapses. To display the remaining amount in detail.

However, in order to achieve this process, it is necessary to check the remaining amount of running tape from time to time. As a means of detecting the remaining time, the area of the tape is always constant regardless of the state of the tape and the playback mode or recording mode. It is based on the fact that the area of the S. reel side and the area of the take-up reel side decrease or increase linearly with time.

That is, the area of the hub which is always constant for each tape is (πR ² × 2), the area of the tape is (V × t × To), (R) is the radius (radius) of the hub, and (V) is Linear velocity, (t) is the tape thickness, and (To) is the time of the tape (type of tape).

The area change relation equation (St) on the take-up reel side where the total area is always constant is the area of the hub (πR ² ) + the area of the tape (V x t) x the running time (Tm), and the area change relation equation (Ss) on the supply reel side is As the area of the hub (πR ² ) + the area of the tape (V x t) x the remaining time of the tape (To-Tm), the tape starts to travel and changes linearly with time.

Based on the above equation, the change of area with time of the tape type shown in Table 3

TABLE 3

Can be defined as

Therefore, the type of tape is determined once from the change of the total area (2πR ² + V × t × To).

However, the development equation is calculated as above, but the data obtained from the video tape recorder is only the reel pulse and the linear velocity (V) of the tape related to the playback mode.

That is, if the radius (R) is obtained from the data whose original area (πR ² ) is memorized,

=

(T=릴의 1회전 시간)이므로 원의 면적(S)은R =

=

(T = one turn time of the reel), so the area (S) of the circle

)²=

이 된다.s = πR ² = π (

) ² =

Becomes

(Ts²+Tt²)이 되며, 이와 비교되는 주행하지 않은 상태의 테이프 총면적은 상기 표 2와 같이 테이프 종류에 따라 미리 계산한 값과 비교한 차이로 다른 값을 나타내게 한다.Therefore, the total area of the tape

(Ts ² + Tt ² ), and the total area of the tape in the non-driving state compared to this is different from the previously calculated value according to the tape type as shown in Table 2 above.

As described above, the remaining amount is determined according to the type of tape, and the remaining time is calculated by comparing the values obtained from the theory with the actual value. When the different rod values are determined, the remaining area is calculated on the supply reel side (Ss).

(Ss-πR²)이 성립된다.Residual time (To-Tm) at Ss = πR ² + V × t (To-Tm) =

(Ss-πR ² ) is established.

If the actual value is substituted into the area Ss on the supply reel side from this equation, the actual remaining time

-π²이 얻어진다.(To-Tm) =

-π ² is obtained.

This process is carried out with the flow chart from the actual data input 200 to the tape remaining time determination 300, and at the same time, the rotational speed of the supply reel (Ts), the rotational speed of the take-up reel (Tt), and the total number of tapes. The data type 201 of time length (including type) (To) and tape linear speeds (V) is determined to determine the tape type (To) of the input data, and then the tape type (To) of the input data is determined. (T-160), the thickness (t2) data of the tape and the radius (R2) data of the hub are loaded (208) (209), and the tape type (To) of the input data is T-160. Otherwise, the tape thickness t1 up to T-30-T-120 is loaded into the rod 203, and the supply reel one turn time change amount Ts of the data input 201 and the one turn time change amount of the take-up reel. Using (Tt), the area (Ss) on the supply reel side and the area (St) on the take-up reel side are respectively calculated (204). The total area ΣS of the tape is compared 206 with the value shown in the calculation 205 and the total area Sa of each tape type previously stored in the memory.

At this time, if the total area (ΣS) at the time of running the tape is larger than the total area (Sa) of each memorized tape type, the hub radius (R1) data of the T-30 and T-60 is loaded into the rod 207, and the total area (Sa). If the total area (ΣS) is smaller than), the hub radius (R2) data of the T-90 and T-120 are loaded into the rod 209, and then the remaining time determination process 300 is performed. It will load other data.

As the loaded value is determined, a subroutine regarding the remaining tape time in the next step is performed. The remaining amount is calculated from the loaded data and the data continuously input from the supply reel.

)와 (

), 및 원의 면적(πR²)을 계산(302)한 다음 잔량시간을 계산(303)하여 얻은 데이타 값을 잔량시간 표시부(400)과정으로 전달하게 된다.That is, when data is input 301 to the rotational time change amount Ts of the supply reel and the linear velocity V of the tape, the measured value of the area change value of the supply reel side (

)Wow (

), And the area (πR ² ) of the circle is calculated 302 and then the remaining time is calculated 303, and the data value obtained is transferred to the remaining time display unit 400.

In the remaining time display unit 400 routine, as shown in FIG. 4, the size of the wound tape is determined according to the remaining time To-Tm, thereby expressing the display of the remaining time in three dimensions.

Therefore, as described above, the present invention can obtain a more accurate remaining amount of the tape by using the rotation cycle of the take-up reel and the supply reel, which returns the hub of the tape, constant according to the remaining amount of the tape, while remaining time Is displayed as a light emitting diode block having different sizes according to the set size, so that the user can easily recognize the remaining amount of tape running and provide a new perspective of the video tape recorder industry to consumers. will be.

Claims (3)

In a conventional video tape recorder apparatus for comparing and detecting a photoelectric signal detected by a hool element by rotation of a hub, a pulse signal generated from a supply reel unit and a pulse signal generated from a take-up reel unit are input ports A1. Are connected to be transmitted to the system controller A7 through the pulse counter A4, and a frequency of a predetermined period oscillated from the clock signal generator A2 is divided into the frequency divider A3 and A5. The clock signal divided by the reference clock is supplied to the system control unit A7 and the timer unit A6, respectively, and the ROM A8 connected to the system control unit A7 by the data bus is a timer unit A6. ) And the accumulator (A10) is also connected to the RAM (A9) connected by a data bus, and the accumulator (A10) and the output port (A12) are respectively connected to a data bus around the operation control unit (A11), the system My In the section A7, the output port A12, the timer section A6, the RAM A9, and the operation control section A11 are commonly connected as a data bus, and the light emitting diodes LD1-LD8 are connected to the output side of the output port A12. A display unit (A13) having a remaining capacity of a VTR, characterized in that the display unit (A13) connected in parallel with each other is configured. The display unit A13 of claim 1, wherein the display unit A13 divides dozens of light emitting diodes LD1 to LD8 into parallel light emitting diodes in proportion to the time-determined size of each block. A VTR tape remaining detection display device, which is sequentially turned off as time passes. It has data of VHS standard hub radius (R) and tape thickness (t) according to the type of tape, and the pulse signal generated according to the rotation speed of the reel in the supply reel unit and the signal generated in the take-up reel unit The time from the transition from high to the high to the next low and high transition of the signal is calculated in real time and the calculated real time is compared with the data already stored in memory. And a service routine of the remaining time for determining the remaining time of the tape with a value obtained afterwards.

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