KR940009543B1 - Vaniable velocity display apparatus and method of vtr - Google Patents

Abstract

The device includes a KEY input means having a variable speed designating key; a detecting means for detecting a rotation speed of a capstan motor; a character generating means; and a controlling means for reading out the value detected by the detecting means, obtaining a variable speed value setting against the rotation speed value of the capstan motor in normal playing back mode and then transmitting the variable speed value to the letter generating means.

Description

VTR variable speed display device and method

1 is a block diagram showing an embodiment of a variable speed display device of the present invention.

2 is a block diagram showing another embodiment of the variable speed display device of the present invention.

3 is a flowchart showing an example of the variable speed display method of the present invention.

* Explanation of symbols for main parts of the drawings

1, 22: capstan motor driver 2, 22: capstan motor

3, 23: drum 4, 24: recording / playback head

5, 25: recording / playback section 6, 26: video recording section

7, 27: drum driver 8, 28: servo unit

9, 29: OSD 10, 30: KEY input

11, 31: detector 12, 32: microcomputer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable speed control apparatus for a VTR (hereinafter referred to as a VTR), and more particularly, to a variable speed display apparatus and a method thereof capable of displaying a variable speed through an image display unit.

Speed control in the conventional VTR has been limited to a few. That is, playback (FF), fast playback (FF, REW), and still playback (STILL). In operation of each mode, VTR recognizes user's mode designation through micom and performs system control necessary to perform designated mode, and informs user's designated mode by text display through image display for man-machine interface. . However, recently, as a variable speed device using a jog shuttle (JOG SHUTTLE) has been put into practical use, it is desired to add a function capable of indicating a variable speed mode. In addition, in the variable speed apparatus using the jog-shuttle, it is preferable to be able to inform the present variable speed in addition to the display of the variable speed mode. In the conventional apparatus, only the designated KEY input is recognized, so that only the variable speed designated key of the KEY input unit can be recognized, but the variable speed cannot be known. Therefore, in the conventional variable speed display device, it is impossible to display the variable speed in the variable speed device using the jog-shuttle. Accordingly, an object of the present invention is to provide a variable speed display device which is provided in a form that can be recognized by a user by measuring the variable speed following the variable speed display device of the VTR.

Another object of the present invention is to provide a control method of a variable speed display device which measures a variable speed in a VTR and provides the form in a form that can be recognized by a user.

The variable speed display device of the present invention for achieving the above object further includes a detection means for measuring a variable speed and a variable speed display designation key in addition to the conventional variable speed display device.

In the control of the variable speed display device, in addition to the process of performing the variable speed control by recognizing the variable speed designation key of the user, determining whether the variable speed display designation key is input and measuring the variable speed when the key is designated. And a process of displaying the variable speed and a process of erasing the variable speed display when the key is released. The present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an embodiment of a variable speed display device of the present invention.

When the tape travels by the rotation of the capstan motor 2 driven by the capstan motor driver 1 in the operation of FIG. 1, the tape is recorded on the tape by the recording / reproducing head 4 mounted on the drum 3. The information is entangled and converted into an image signal through the recording / reproducing section 5 and supplied to the image processing section 6. The drum 3 is driven by the drum driver 7, and the capstan motor 2 and the drum 3 are controlled by the control signals of the servo unit 8 and the variable speed operation. The user's command is input through the KEY input unit 9, and character generation for the man-machine interface is performed in the OSD 10 (ON SCREEN DISPLAY). Each of these parts is controlled by the microcomputer 12. The information transmitted from the microcomputer 12 to the OSD 10 is a code value (code value in the OSD) of a variable speed value displayed in characters, data specifying a display position, data indicating a display mode, and the like. The OSD 10 forms an image to be output to the image display unit 6 in the RAM (UANDOM ACCESS MEMORY) in the OSD 10 based on the information sent from the microcomputer 12, and the horizontal synchronous H supplied from the system. SYNC) and V.SYNC read the data stored in RAM. The video signal having the character information output from the OSD 10 is combined with the video signal supplied from the recording / reproducing section 5 and displayed by the video processing section 6. On the other hand, a counter 11 is provided for measuring the variable speed.

The counter 11 counts the FG signal (FREQUENCY GENERRATION; sinusoidal signal generated by the rotation of the capstan motor) in the capstan motor driver 1 for a predetermined time. The microcomputer 12 reads the count value of the counter 11 and divides it by the FG value at the time of normal reproduction, and calculates a variable speed. The calculated variable speed value is transmitted to the OSD 10. The video signal having the character information output from the OSD 10 is added to the signal from the recording / reproducing section 5 to be displayed by the image processing section 6. 2 is a block diagram showing another embodiment of the variable speed display device of the present invention. In the operation of FIG. 2, when the tape is driven by the rotation of the capstan motor 22 driven by the capstan motor driver 21, the tape is recorded on the tape by the recording / reproducing head 24 mounted on the drum 23. FIG. The obtained information is read and converted into an image signal through the recording / reproducing section 25 and supplied to the image processing section 26. The drum 23 is driven by the drum driver 27, and the capstan motor 22 and the drum 23 are controlled by the control signals of the servo unit 28 and the variable speed operation.

The user's command is input through the KCY input unit 29, and character generation for the man-machine interface is performed in the OSD 30 (ON SCREEN DISPLAY). Each of the above parts is controlled by the microcomputer 32. The information transmitted from the microcomputer 32 to the OSD 30 is a code value (code value in the OSD) of a variable speed value displayed in characters, data specifying a display position, data indicating a display mode, and the like. The OSD 30 forms an image to be output to the image display unit 26 on the basis of the information sent from the microcomputer 32 in RAM (RANDOM ACCESS MEMORY) inside the OSD 10, and the horizontal synchronous H supplied from the system. SYNC) and V.SYNC read the data stored in RAM. The video signal having the character information output from the OSD 10 is combined with the video signal supplied from the recording / reproducing section 5 and displayed by the video processing section 6. On the other hand, an analog / digital converter 31 is provided for measuring the variable speed. The analog / digital converter 31 converts the drive current value of the capstan motor driver 21 into a digital amount and supplies it to the microcomputer 32. The microcomputer 32 reads the digitally converted capstan motor drive current value of the analog / digital converter 31 and divides it by the capstan motor drive current value during normal reproduction to calculate the variable speed. The calculated variable speed value is transmitted to the OSD 10. The OSD 10 converts the information transmitted from the microcomputer 12 into an image signal to be displayed by the image processor 6 and outputs the converted image signal. An image signal having character information output from the OSD 10 is added to the signal from the recording / reproducing section 5 and displayed by the image processing section 6.

3 is an example of a flowchart in a microcomputer for controlling the variable speed display device in FIGS. 1 and 2. If the variable speed operation is designated by the user, the microcomputer recognizes it and performs the flowchart of FIG. 3. First, the variable speed operation is designated (step 300). The microcomputer decodes the command input from the KEY input section to obtain the variable speed designation value and controls the speed of the capstan motor through the servo section based on this. Check whether the variable speed display is designated (step 302). If the variable speed display device KEY is selected, the variable speed value for the normal playback speed value is calculated (step 304). The variable speed value is determined by dividing the count value obtained by counting the frequency of the FG signal generated by the capstan motor for a predetermined period by the FG value during normal reproduction or by dividing the drive current value of the capstan motor by the drive current value during normal reproduction. A variable speed display flag is set (step 306). This variable speed display flag is for notifying that the variable speed value is displayed by the microcomputer through the OSD and the image processor. Variable speed display is performed (step 308). The microcomputer transmits the character code indicating the variable speed value and the information specifying the display position to the OSD. In the OSD, an image to be output to the image processing unit is formed in the RAM (RANDOM ACCESS MEMORY) inside the OSD based on the information sent from the microcomputer, and the H.SYNC and V.SYNC supplied from the system are Read the data stored in RAM accordingly. The video signal having the character information output from the OSD 10 is combined with the video signal supplied from the recording / reproducing section and displayed by the video processing section.

On the other hand, if the variable speed display designation key is not selected in step 302, it is checked whether the variable speed display flag is set (step 312). If the variable speed display flag is not set, the process proceeds to step 310. If the variable speed display flag is set, the variable speed display is released (step 314). Variable speed display is achieved by outputting empty characters in the portion where the variable speed is displayed. Instead of variable speed, micom outputs data representing empty characters and data indicating display position to OSD. The variable speed display flag is reset and the process proceeds to step 310 (step 316). It is checked whether the variable speed designation operation continues (step 310). If the variable speed designation operation continues, the process returns to step 300. If the variable speed designation operation is released, it is checked whether the variable speed display flag is set (step 318). If the variable speed display flag is not set, the flowchart of FIG. 3 ends. If the variable speed display flag is set, the variable speed display is released (step 320), the variable speed display flag is reset (step 324), and the flowchart of FIG.

As described above, the variable speed display device and the method thereof according to the present invention inform the user of the variable speed for the playback speed during the variable speed designation operation through a text display so that the user can determine the appropriate variable speed. The effect is to improve the convenience of.

Claims (5)

A variable speed control device for a VTR, comprising: KEY input means including a variable speed designation key; Detection means for detecting a rotational speed of the capstan motor; Character generation means; And a control means for reading a value detected by the detection means, obtaining a variable speed value in comparison with a capstan motor rotational speed value during normal reproduction, and transferring the value to the character generating means. 2. The variable speed display device of claim 1, wherein the KEY input means further comprises a variable speed display specifying key. 2. The VTR variable speed display device according to claim 1, wherein said detecting means comprises a frequency counter for detecting the frequency of the FG signal generated by the capstan motor. The variable speed display of claim 1, wherein the detecting means includes a converter for analog-to-digital converting a drive current value of a capstan motor. Key input means including a variable speed display designated key; Detection means for detecting a rotational speed of the capstan motor; Character generation means; In the variable speed display device of the VTR comprising a control means for reading the value detected by the detection means to obtain a variable speed value compared to the capstan motor rotational speed value during normal playback and to transmit it to the character generating means, Recognizing whether the variable speed display designated key is input in addition to the process of performing the variable speed control by recognizing the variable speed designated key; Measuring a variable speed when the key is specified; Displaying the measured variable speed on the image processor; And canceling the variable speed display when the variable speed display designation key is released.