KR940008093B1 - Mode control method for vcr - Google Patents

Abstract

The mode execution speed control method includes the steps of: setting a flag continue mode when a current input key is identical to a previous input key, setting a jet fast forward flag and a jet rewind flag when the current key is a fast forward key and a rewind key, respectively, and storing an input key value; during a jet fast forward mode, checking whether a key is continuously pressed, if not, clearing a counter and generating first level data, and if it is continuously pressed, generating second to fourth level data according to a jet fast forward execution time; during a jet rewind mode, checking whether a key is continuously pressed, if not, clearing the counter and generating eleventh level data, and if it is continuously pressed, generating twelfth to fourteenth level data according to a jet rewind execution time, thereby controlling fast forward or rewind speed.

Description

How to Control Execution Speed in Video Tape Recorder Mode

1 is a circuit diagram according to the present invention.

2 is a flow chart for checking a key according to the invention.

3 is a flow chart for implementing a fast FF in accordance with the present invention.

4 is a flow chart for implementing a dead stone REW in accordance with the present invention.

5 is a serial data timing diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

10: micom 20: key matrix

30: servo 40: motor drive

50: capstan motor

The present invention relates to a mode execution speed control method of a video tape recorder (hereinafter referred to as a VTR), in particular, fast forward (hereinafter referred to as FF) and rewind (hereinafter referred to as REW). It refers to a method that can control the execution speed of the mode. The current FF or REW mode of the VTR is fixed at a constant speed. Thus, when the speed of the FF or REW mode is to be increased according to the user's desire, this speed cannot be changed, resulting in an unsatisfactory and inconvenient use.

Accordingly, an object of the present invention is to provide a method of controlling the execution speed of a video tape recorder mode that can control the speed of FF or REW by operating a set of keys or a key of a remote controller (REMOCON) during FF or REW operation of a VTR. have.

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

FIG. 1 is a circuit diagram according to the present invention. The microcomputer 20 recognizes the input key according to the key matrix 10, the key matrix 10, and the remote controller key input, and receives serial data from the microcomputer 20. Capstan motor 50 for transmitting a frequency generating signal FG to the servo 30 for controlling the motor drive 40, which will be described later, the motor drive 40, and the servo 30 which is a reel drive method by a motor. It is a well-known circuit comprised by).

2 is a flowchart for checking a key according to the present invention.

3 is a flowchart of executing a fast FF according to the present invention.

4 is a flowchart of executing a fast REW according to the present invention.

5 is a serial data timing diagram according to the present invention.

Based on the above-described configuration, the present invention will be described in detail with reference to the drawings.

First of all, if the FF / REW key comes back while executing the FF mode or the REW mode of the VTR mode, the execution speed of the mode can be changed by checking the time.

If the microcomputer 10 determines that the FF / REW key is input in step (1A) by performing the key check routine (Routine) of FIG. 2, if the key is not input, the following routine is executed and if the key is input ( Perform step 2A). In step (2A), it is determined whether the current key and the previous key are the same, and if it is the same, it is determined that the key is kept pressed, and then set flag flag (FCONT). Perform. If the current key is not the same as the previous key, in step 4A, FCONT is cleared to perform step 5A.

In step (5A), the microcomputer 10 determines whether the input key is the FF key. If the key is the FF key, step (9A) is performed if it is not performed in step (6A). If you are in FF mode, proceed to step (7A). In step (7A), the next routine is performed by setting FJFF, which is a flag indicating Jet Fast Forward (hereinafter referred to as JFF). In step (5A), if the input key is not the REW key, the microcomputer 10 determines whether the input key is the REW key. In step 10A, if it is determined that the current REW mode is being performed, step 9A is performed. If step RE10 is performed, step 11A is performed. In step 11A, the next routine is set by setting the flag FJREW indicating the JREW. In step (9A), the input key data (Data) is stored to execute the corresponding mode, and the following routine is performed after clearing the FJFF and FJREW that are not being performed.

The JFF or JREW mode is executed using the keys and various flags checked in FIG.

First, when executing the JFF mode execution routine of FIG. 3, it is determined whether or not the JFF mode is high in step (1B).

In step (2B), it is determined whether the key is being pressed continuously, that is, it is determined whether FCONT is high to perform step (3B) if it is not high, and to step (4B) if it is high. In step (3B), the capstan motor 50 for clearing the JFF execution time count rotates forward, outputs first level data, and then performs the next routine. In step (4B), the JFF execution time is counted to determine whether it is 5 seconds or more in step (5B), and then, if it is between 0-5 seconds rather than 5 seconds, step (6B) is performed. In step (6B), after the forward data and the second level data are output through the serial data line, the next routine is performed. In step (5B), if it is 5 seconds or more, step (7B) is performed. In step (7B), the microcomputer 10 determines whether it is 10 seconds or more.

If it is between 6 seconds and 10 seconds instead of the above 10 seconds, the next routine is performed after outputting the forward rotation information and the third level data in step (8B). In step (7B), if the operation is longer than 10 seconds, step (9B) is performed to output the forward rotation information and the fourth level data, and then the next routine is performed. The first level is 6 minutes for the T-120 tape, which is a commonly used speed, and the second level is 4 minutes and 30 seconds for the T-120 tape, which is SP × 25 for playback in the SP mode. The third level is SP x 25 x 2.5, which is 2 minutes and 38 seconds for the T-120 tape, and the fourth level is SP x 25 x 3, which is 1 minute for the T-120 tape.

When executing the next JREW mode execution routine, if the FJREW is not high in step (IC), the next routine is executed, and if the FJREW is high, it performs step (2C) to determine whether the key is being pressed continuously. We judge whether it is high. If FCONT is not high, step (3C) is performed. If FCONT is high, (4C) is performed. In the step (3C), the JREW execution time count is cleared to reverse rotation, the eleventh level data is output, and the next routine is performed. In the step (4C) to perform the step (5C) to count the JREW execution time.

In step (5C), it is determined that the application is for 5 seconds or more, and if it is not 5 seconds or more, step (6C) is performed. In step (6C), the reverse routine and the twelfth level data are output, and then the following routine is performed. In step (7C), it is determined that the application is more than 10 seconds, and if it is not more than 10 seconds, step (8C) is performed, and if it is more than 10 seconds, step (9C) is performed. In step (8C), the reverse routine and the thirteenth level data are output to perform the following routine. In step 9C, the reverse rotation information and the fourteenth level data are output to perform the following routine. Level 11-14 is the same speed as level 1-4, and the relationship between the level 11-14 and level 1-4 and data is shown in Table 1 below. When executing JFF or JREW mode, the contents of serial data are applied using only data (D6-D13). Other data are not related to the present invention.

TABLE 1

The serial data format is shown in FIG. 5, where (a) is a clock signal and (b) is data.

As described above, the speed of the FF or the REW can be controlled by the key operation of the set or the key of the remote controller during the FF or REW operation of the VTR, thereby improving the quality of a product that can satisfy the needs of consumers.

Claims (2)

In the fast forward or rewind operation method of the videotape recorder, if the key is input, if the previous key is the same as the previous key, it is determined that the key is kept pressed, and FCONT is set. If the current key is REW key, set FJREW and save the input key value according to key input to execute the corresponding mode; if JFF mode, judge whether the key is kept pressed. After clearing and rotating forward, output the first level data and keep pressing the second process to output the second to fourth level data according to the pressed JFF execution time, and judge whether the key is pressed continuously in the JREW mode. If it is not pressed, the JREW execution time count is cleared and the motor rotates in reverse. After outputting the eleventh level data, And a third process of outputting the 12th to 14th level data according to the pressed JREW execution time. The method of claim 1, wherein the second and third processes check the JFF execution time or the JREW execution time, and if the time is 0-5 seconds, the second and twelve level data is 6 to 10 seconds, and the third and the thirteenth level data are 10 seconds. If it is, the execution speed control method of the video tape recorder mode characterized by outputting the 4, 14 level data.

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