KR920000429B1 - Capstan control process for v.t.r. - Google Patents

Abstract

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Description

Capstan control method of video tape recorder

1 is a system diagram for carrying out the present invention.

2 is a flow diagram of one embodiment of the present invention.

3 is a flow chart of another embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

10: Micom 11: Keyboard

12: mechanical part 13: logic control unit

14: servo circuit unit 15: circuit control unit

16: sensor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder (hereinafter referred to as a VTR) and, more particularly, to a capston control method for driving a tape at a constant speed. In general, a VTR is a device for recording video information and audio information on a tape or reproducing recorded video information and audio information. In order to record or store audio information and video information in the VTR, it is necessary to accurately drive a tape at a constant speed. In general, the tape is driven by the rotation of the capstan, and the capstan driving method includes a belt drive method and a direct drive method. The belt drive method is a method of rotating the capstan by hanging the belt to the capstan motor and the capstan, the direct drive method is a method of rotating the capstan by rotating the capstan motor by connecting the capstan to the capstan motor. In the capstan driving method, the control timing of the capstan motor that rotates the capstan is different from each other, and a processor for controlling the capstan during manufacture has to be re-developed according to the belt driver method or the direct driver method.

Accordingly, an object of the present invention is to provide a capstan control method of a VTR that can control a capstan driving a tape in a VTR regardless of a direct driver method and a belt driver method change.

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

1 is a system diagram for carrying out the present invention, a microcomputer 10 for controlling a system, a keyboard 11 for generating and outputting function key data selected by a viewer to the microcomputer 10; Mechanism unit 12 for loading the tape to record or store the image information and audio information on the tape, and a logic controller for adjusting the rotational direction of the motors of the mechanism unit 12 under the control of the microcomputer 10. 13, a servo circuit section 14 for controlling the speed of drums and reels and motors in the mechanism section 12 under the control of the microcomputer 10, and video and audio information to be recorded or stored on a tape. A circuit control unit 15 to sense the operation state of the mechanism unit 12 and the switching state of the mode switches, a sensor unit 16 which outputs to the microcomputer 10, and a power supply unit supplying power to each circuit ( Consists of 17) and 2 is a flow chart of an embodiment of the present invention performed by the microcomputer 10, the capstan driving method by determining the capstan driving method by initializing the system and the stored data and then checking the input state input through the input port at the time of power supply. A first process of setting a flag for the second process, a second process of controlling power supply to a peripheral circuit after performing the first process, and checking whether key data is input, and inputting the key data at the second process According to the third step of performing the function for the key data and the capstan driving method that is set by checking the current operation mode and the next operation mode when the key data is not input in the third process or after performing the third process After controlling the capstan, check the operation status with respect to the current mode, and then compare the operation status of the system with the current mode. A control system for the normal operation for at least the operating state checks do state occurs, and then made to go back to the fourth process of the second step.

An embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2 described above.

When the power supply is applied, the microcomputer 10 initializes the entire system, clears the data stored in the buffer in its own state to “0” state, checks by inputting the output of the sensor unit 16 in the initial state, and interrupts at regular intervals ( (Step 201) After performing step 201, the microcomputer 10 inputs the output of the sensor unit 16 input through the input port and outputs the sensor unit 16 in the initial state. By comparison, it is determined whether the capstan driving method is the belt driver method or the direct driving method, and then sets a flag corresponding to the determined capstan driving method. (Step 202) After performing the step 202, the microcomputer 10 transmits to the peripheral circuits. Determine whether or not the power is supplied to supply or cut off power to the peripheral circuits (step 203). After performing the step 203, the microcomputer 10 determines whether key data is input from the keyboard 11 itself. Check the buffer in When the key data is input in step 204, the microcomputer 10 controls the servo circuit 14, the logic controller 13, and the circuit controller 15 to perform a function corresponding to the input key data. Step 205) After performing step 205 or when no key data is input in step 204, the microcomputer 10 performs a mode switching state from the sensor unit 16, that is, play, fast forward, and record. (REC) and the fast reverse signal is input to check the current mode and check the next mode (step 206). After performing the step 206, the microcomputer 10 determines the capstan driving method. In step 207, if the flag for the belt drive system is set in step 207, the microcomputer 10 sets the flag for the direct drive method. Generates belt drive capstan control signals and outputs them to the servo circuit unit 14 and the logic controller 13.

The logic circuit unit 13 and the servo circuit unit 14 which input the belt driver type capstan control signals from the microcomputer 10 drive the mechanism unit 12 according to the input signal (operation 208) and operation 207. When the flag corresponding to the direct drive method is set, the microcomputer 10 generates the direct drive capstan control signals and outputs them to the logic controller 13 and the servo circuit unit 14. At this time, the logic control unit 13 and the servo circuit unit 14 drive the mechanism unit 12 by direct driver type capstan control signals input from the microcomputer 10 (step 209). After performing step 207, the microcomputer 10 inputs and checks the detection signals for the operation state of the mechanism 12 from the sensor unit 16, that is, start, end, and extra. The operation state is checked (step 210) and after performing step 210, the microcomputer 10 sets the control state of the circuit control unit 15 and the operation state of the mechanism unit 16, which is the output of the sensor unit 16, to the current mode. Check the system's abnormal operation status, and if the system is in abnormal operation status, control the logic control unit 13, servo circuit unit 14, and circuit control unit 15 to restore the system to the normal state. In operation After the operation, the microcomputer 10 proceeds to step 203 (step 214) and the microcomputer 10 performs steps 212 to 214 when an interrupt occurs at a predetermined cycle. The counting time of the mechanism 13 of the timer in itself is added. After performing step 212, the keyboard 11 is scanned and the selected key data is input and stored in the RAM (step 213). After performing step 213, the microcomputer 10 receives the sensor 16 from the sensor unit 16. Inputting the sensed data detected by each sensor is stored in the RAM, and then returns to the routine that performed the interrupt generation determination (step 214).

FIG. 3 is a flow chart of another embodiment of the present invention performed by the microcomputer 10. The first process of initializing the system and stored data and generating an interrupt at a predetermined period upon powering up, and after performing the first process A second process of determining whether power is supplied to each of the surrounding circuits, controlling the power supply, and then checking whether key data is input, and performing a function on key data input when key data is input in the second process. In the third process and the second process, if no key data is input, after performing the third process, the current operation mode and the next operation mode are inspected to control the capstan, and then the operation of the capstan is related to the current operation mode. After checking, the operation status of the system is compared with the current operation mode and the current operation mode. If it occurs, recover the abnormal operation state of the system to the normal operation state, and then return to the second process and count up the time of the timer every time an interrupt occurs at a certain period, and input the selected key data. The fifth step is to store and store the detected signals detected by the sensors, and then return to the routine before generating the interrupt.

3 will be described in detail with reference to FIG. 1.

Steps 301 to 305, 307, and 308 except for step 306 of FIG. 3 are the same as steps 201, 203 to 205, 210, and 211 of FIG. Weak description because it performs operations and functions. In operation 306, the microcomputer 10 generates capstan control signals according to the belt drive method and the direct drive method, and outputs them to the logic control unit 13 and the servo circuit unit 14 through different output ports. Then, the logic control unit 13 and the servo circuit unit 14 which input the capstan control signal of the direct drive method and the capstan control signal of the belt drive method together from the microcomputer 10 are the mechanism part 12 which drives the capstan by the direct drive method. The capstan is driven by the input signal irrespective of whether the) is installed or the mechanism 12 for driving the capstan by the belt drive method is provided.

As described above, the present invention allows the microcomputer 10 to recognize the capstan driving method of the installed mechanism and actively control the capstan according to the recognized capstan driving method or to output capstan control signals according to both capstan driving methods. By using the unconditionally generated using the advantage that can control the capstan irrespective of the capstan driving method.

Claims (1)

A capstan control method of a video tape recorder, the method comprising: setting a flag for a capstan driving method by determining a capstan driving method by initializing a system and stored data upon powering and then checking an input state input through an input port; And a second process of controlling power supply to a peripheral circuit after performing the first process, and then checking whether key data is input, and performing a function on key data input when the key data is input in the second process. When the key data is not input in the third process and the third process, but after performing the third process to check the current operation mode and the next operation mode to control the capstan in accordance with the set capstan driving method and then the operation state After checking in relation to the current mode, abnormal operation state can be occurred by comparing the operation state of the system with the current mode. The controller controls the system so that the abnormal operating state becomes a normal operating state by checking and then counts the time of the timer and counts the selected key data every time the interrupt occurs occurring at a certain period. And a fifth process of inputting and storing the input and storing the detection signals detected by the sensors, and returning to the routine before generating the interrupt.

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