KR19980065519A - Automatic search method of recorded video tape - Google Patents

Abstract

The present invention relates to an automatic search method of an image-recorded video tape that can repeat high-speed driving and playback by a certain running amount and playback amount of the tape by using the rotation speed of the reel on which the tape is wound. Traveling; Calculating a high speed traveling amount of the tape by detecting an output signal according to rotation of the reel; Moving the tape to a playback position when the calculated high speed travel amount is equal to or greater than a predetermined amount; Playing the tape; Calculating a reproduction amount of the tape by detecting a control pulse signal recorded on the tape; And driving the tape at a high speed when the calculated amount of reproduction is greater than or equal to a predetermined amount. The method includes a high speed driving mode such as a fast forwarding (FF) or a rewinding (REW), that is, a full loading method or a half. Regardless of whether it is a loading method or an unloading method, the present invention is applicable to any method.

Description

Automatic search method of recorded video tape

The present invention relates to a videotape search method for searching video contents recorded on a videotape used in a video recorder (VCR). More particularly, the present invention relates to a videotape search method. Detects the number of pulses generated by the rotation of the wound reel, and detects the number of control pulses recorded in the control track of the recording tape when the double speed playback mode (CUE or REVIEW) is performed, and from the detected number of pulses. By determining the high-speed driving speed and the double-speed regeneration amount of the recording tape, respectively, the high-speed driving and the double speed replay can be repeated by a predetermined traveling amount and regeneration amount regardless of the method of performing the high speed driving mode of the video recording player A method for automatically searching recorded video tapes.

In general, Auto Visual Search (AVS) means that when a user wants to find and play a certain section of the recorded video tape, the user can easily find the section where the desired video is recorded. In order to achieve this, the speed regeneration mode is performed by switching the mode after performing the high speed driving mode for a certain period, and performing the high speed driving mode by repeatedly switching the mode after performing the speed regeneration mode for a predetermined period. This automatic search mode allows the user to visually judge the image being played on the screen of the external image display device by the periodic double speed playback to find a desired section, so that the user can navigate to a desired section on the recording tape. While searching in the mode, pressing the play button for each predicted position saves the user from having to keep checking the video recorded on the currently running recording tape.

By the way, the automatic search apparatus for a conventional video recording video tape, as shown in Fig. 2, a key input unit 10 to receive a command directly from the user; A remote controller receiving unit 20 through which a signal is input at a long distance through the remote controller; A capstan motor 50 for driving the green tape; Mort driving unit 40 for rotating the capstan motor 50 at a desired speed; A loading arm 70 for switching between the high speed traveling position and the double speed reproduction position of the recording tape; A loading motor 60 for operating the loading arm 70; A control head 30 for detecting a control signal recorded in the control track of the recording tape; And checking whether an automatic search command is input from the user through the key input unit 10 or the remote control receiver 20, and controlling the loading motor 60 and the loading arm 70 to drive the high-speed driving position of the recording tape. Switching between the speed playback positions, reading the high speed travel amount and the speed playback amount of the recording tape from the number of pulses detected by the control head 30, and repeatedly performing the high speed playback and the speed playback for a certain tape section. And a control unit 100 for controlling the motor driving unit 40 and the capstan motor 10 to be configured.

In the conventional automatic recording apparatus of the conventional video recording video tape configured as described above, the key input unit 10 or the remote control receiver 20 during the play mode of the full loading state as shown in FIG. 4 is performed. When a forward auto search command or a reverse auto search command is input from the user, the controller 100 controls the loading motor 60 and operates the loading arm 70 to operate the recording tape as shown in FIG. 5. While switching to the high speed driving mode (REW or FF) position in the half loading state as described above, the motor driving unit 40 is controlled to move the capstan motor 50 in the search direction of the input auto search command. Rotation at high speed, detecting the control signal recorded on the control track of the recording tape, which is read through the control head 30 while the recording tape is running at high speed, and switching to the high speed driving mode. Continuously counting the detected control signal, the high-speed running amount of the recording tape, that is, it is possible to calculate the total length of the recording tape moves during execution of high-speed traveling mode (REW or FF).

Subsequently, when the calculated total high-speed driving amount of the recording tape reaches a predetermined reference value, the controller 100 controls the loading motor 60 again to operate the loading arm 70 to operate the recording tape. According to the search direction of the inputted auto search command, the apparatus switches back to the forward speed playback mode (CUE) or the reverse speed playback mode (REVIEW) position in the full loading state as shown in FIG. The motor driving unit 40 is controlled to rotate the capstan motor 50 at a double speed regeneration speed, and the control signal read through the control head 30 is continuously counted while the recording tape is replayed at double speed, thereby to enter the double speed regeneration mode. By calculating the total number of control signals detected from the time of switching, the total length of the recorded tape reproduced during the double speed playback mode (CUE or REVIEW) can be known.

Subsequently, when the calculated total reproduction amount of the recording tape reaches a predetermined reference value, the controller 100 switches back to the high speed drive mode, and then continues in the above process, that is, in the high speed drive mode and the double speed reproduction mode. The process of switching to and from the double speed playback mode to the high speed driving mode was repeatedly performed until a separate command is input from the user through the key input unit 10 or the remote control receiver 20.

However, in the conventional automatic search method of a video recording video tape constructed and acting as described above, a mode switching control signal for repeatedly performing high-speed driving and double speed playback for a predetermined length of a predetermined tape length is reproduced. In the case of switching from the high speed driving mode to the high speed driving mode as well as from the high speed driving mode to the double speed regeneration mode, the control pulse signal detected through the control head 30 is always used, Since the high-speed traveling amount and the double speed regeneration amount of the recording tape were calculated from the numbers, the full loading method or the half loading, in which contact between the recording tape and the control head 30 is continued even during the high-speed driving mode. In the case of the method, the above apparatus and method can be applied without any problem, but In the case of the unloading method in which no contact was made between the recording tape and the control head 30 when the recording was performed, the control signal could not be detected through the control head 30. There was a problem that auto search could not be performed in units.

Accordingly, the present invention is provided to solve the above problems, and to provide an automatic search method of an image-recorded video tape capable of executing an auto search command regardless of a fast driving mode.

1 is a block diagram showing a preferred embodiment of an automatic search apparatus for implementing an automatic search method for an image-recorded video tape according to the present invention;

2 is a configuration diagram of an automatic search apparatus for a conventional video recording video tape,

3 is a flowchart of an automatic search method of an image-recorded video tape according to the present invention;

Figure 4 shows the tape running state in the case of full loading (Full Loading),

5 illustrates a tape running state in the case of half loading.

* Description of the symbols for the main parts of the drawings *

10: key input unit 20: remote control receiver

30: control head 40: motor drive unit

50: capstan motor 60: loading motor

70: loading arm 80: reel pulse generator

90: input unit 100: control unit

According to an aspect of the present invention, there is provided a method for automatically searching a recorded video tape, comprising: driving a tape at high speed; Calculating a high speed traveling amount of the tape by detecting an output signal according to rotation of the reel; Moving a signal of a tape to a playback position when the calculated high speed travel amount is a predetermined amount or more; Playing the tape; Calculating a reproduction amount of the tape by detecting a control pulse signal recorded on the tape; And driving the tape at high speed when the calculated amount of reproduction is equal to or greater than a predetermined amount. The output signal of the high-speed traveling amount calculating step is a frequency generated by rotation of the reel.

In the automatic search method of video-recorded videotape according to the present invention as described above, when a forward auto search command or a reverse auto search command is input from a user, the control means first records the tape according to the direction of the input auto search command. Run in a high-speed driving mode such as pre-winding (FF) or rewinding (REW), and then detect the number of pulses generated by the pulse generating means according to the rotation of the reel to perform the high-speed driving amount of the tape, that is, the high-speed driving mode. After calculating the total length of the moved tape, and if the high-speed running recording tape length reaches a preset reference value, controlling the tape position moving means to switch the recording tape to the double speed playback position, and then the tape driving means. Control to drive the recording tape in double speed playback mode (CUE or REVIEW).

During the double speed playback mode, the pulse signal recorded on the control track of the recording tape is detected by the pulse detecting means to calculate the double speed playback amount, i.e. the length of the double speed playback tape, and the double speed playback tape length is When the set reference value is reached, the recording tape which controls the tape position moving means is switched to the high speed traveling position, and then the tape driving means is controlled to drive the recording tape in the high speed driving mode (FF or REW).

That is, when switching from the high speed reproduction mode to the high speed driving mode, as in the conventional case, the pulse signal recorded on the control track detected by the pulse detecting means is used as the mode switching control signal. When switching to, using the number of pulses generated by the pulse generating means as the mode switching control signal in accordance with the rotation of the reel, repeatedly performing high-speed driving and double speed playback as long as a predetermined recording tape length in accordance with a preset reference value While playing the video content recorded on the recording tape to the user periodically and showing a separate play command from the user who checks the desired video, the play process is completed after the repetition process is executed. Done.

Best Mode for Carrying Out the Invention A preferred embodiment of an automatic search method for an image-recorded video tape according to the present invention will now be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a preferred embodiment of an automatic search apparatus for implementing an automatic search method of an image-recorded video tape according to the present invention, comprising: a key input unit 10 for directly inputting a command from a user; A remote controller receiving unit 20 through which a signal is input at a long distance through the remote controller; A capstan motor 50 for driving the green tape; A motor driver 40 for rotating the capstan motor 50 at a desired speed; A loading arm 70 for switching between the high speed running position and the double speed reproduction position of the recording tape; A loading motor 60 for operating the loading arm 70; A control head 30 for detecting a control signal recorded in the control track of the recording tape; A reel pulse generator 80 for outputting a pulse according to the rotation of the reel in which the recording tape is wound; And checking whether an automatic search command is input from the user through the key input unit 10 or the remote control receiver 20, and controlling the loading motor 60 and the loading arm 70 to drive the high-speed driving position of the recording tape. Switching between the double speed reproduction positions, reading the double speed traveling speed and the high speed reproducing amount of the recording tape from the number of pulses detected by the control head 30 and the number of pulses generated by the reel pulse generator 80, And a controller 100 for controlling the rotational speed of the motor driving unit 40 and the capstan motor 50 operated by the motor driving unit 40 to repeatedly perform the high speed reproduction and the double speed reproduction during a tape section of a predetermined length. have.

3 is a flow chart showing the flow of the automatic search method of an image-recorded video tape according to the present invention. Hereinafter, the automatic search method according to the present invention will be described in detail with reference to the configuration of the preferred embodiment of the automatic search apparatus. .

First, the controller 100 checks whether a forward auto search command or a reverse auto search command is input from the user through the input unit 90-the key input unit 10 or the remote control receiver 20 (S11). ).

When the user inputs the automatic search command through the input unit 90, the controller 100 determines whether the operation mode in which the video recording player is currently running is a stop or play mode. As in the rewind (REW) and forward (FF) modes, it is checked whether the recording tape is a high speed driving mode that runs at a high speed of 10 times or 12 times the normal reproduction traveling speed (S12).

If the currently operating mode is a high speed driving mode such as a rewind (REW) or a fast forward (FF) mode, the operation mode is continuously performed. If the current operating mode is not the high speed driving mode, the motor driving unit ( 40, the capstan motor 50 is rotated at a high speed, and the green tape is driven in a high speed driving mode such as a rewind (REW) or a prewind (FF) mode (S13).

Subsequently, the control unit 100 detects a pulse generated by the reel pulse generator 80 provided at the lower end of the reel by the rotation of the reel in which the recording tape is wound, and detects the detected pulse. The total number of pulses detected from the input time of the search command or the start time of the high speed driving mode is continuously counted (S14).

At this time, the reel pulse generator 80 is to generate a predetermined number of pulses as the reel, the tape is wound one rotation, it is possible to know the rotational speed of the reel from the number of pulses detected per unit time. . By the way, the rotation speed of the reel, because the recording tape is also running at a constant speed as the capstan motor 50 rotates at a constant speed, so that the magnitude of the speed varies depending on the amount of the recording tape wound on the reel. do. That is, the greater the amount of the green tape wound on the reel, the longer the distance from the center of the reel to the outermost green tape, and thus the longer the circumferential length of the outermost of the reel on which the green tape is wound. If a large amount of tape is wound on the reel, the reel rotation speed is slowed down, and if a smaller amount of tape is wound, the reel speed is increased. Therefore, the rotation speed of the reel and the radius of the tape wound at the rotation speed can be known by the number of pulses detected per unit time, and from this, the length of the high speed running during that time is approximated by the following equation. You will know.

S (Riding Length) = vt = Rwt (where R is the wound tape radius, w is the reel rotation speed, t is the high speed rotation time)

The control unit 100 checks whether or not the high-speed driving amount of the recording tape calculated using the method described above is equal to the preset reference value (S15), until the reel pulse generation unit ( 80 and continuously counting the number of pulses generated at the same value, and when the same value as the reference value, by controlling the loading motor 60 to operate the loading arm 70 to switch the recording tape to the double speed playback position, the motor drive unit By controlling 40, the capstan motor 50 is decelerated and rotated, so that the recording tape is driven in the forward double speed regeneration mode CUE or the reverse double speed regeneration mode REVIEW in accordance with the direction of high speed driving (S16).

When performing the double speed playback mode, the control unit 100 detects, via the control head 30, a control signal recorded on a control track of a recording tape, and transfers the detected control signal to the double speed playback mode. The total number of control signals detected from the switching point is continuously counted (S17).

In this case, since the control signal is a signal of 30 Hz based on the normal playback time, and is continuously recorded at a predetermined interval on the control track, when the total number of detected control signals is calculated, the double speed playback mode (CUE) is performed. Or REVIEW), you can see the length of the tape moved.

The control unit 100 checks whether or not the double speed reproduction amount of the recording tape calculated using the method described above is equal to the preset reference value (S18), until the control head 30 becomes equal to the reference value. If the number of the control signal detected in the continual counting, and the same as the reference value, by controlling the loading motor 60 to operate the loading arm 70 to switch the recording tape to the high-speed driving position, the motor drive unit ( 40, the capstan motor 50 is rotated at high speed again to drive the recording tape in the high speed driving mode (S13), and the entire process is repeated until a separate Play command is input from the user. When a Play command is input from a user who finds a desired section by a video that is played at double speed at regular intervals of the tape (S13, S14, S15, S16, S17, S18, S13, ...),Switching to the play mode (S20), the process is completed.

The above description applies the automatic search method according to the present invention to a half loading method or an unloading method in which the position of the tape in the high speed driving mode and the tape in the double speed playback mode are not identical. If the position of the tape in the high speed driving mode and the position of the tape in the double speed playback mode is to be applied to the same full loading method, the loading arm 70 and the loading motor are described. It is only necessary to control the capstan motor 50 and the motor drive unit 40 to control only the running speed of the tape without controlling the 70 to switch between the high speed running position and the double speed reproduction position of the recording tape.

The automatic search method of an image-recorded videotape according to the present invention, which is configured and acts as described above, is called a full loading regardless of a method of performing a high-speed driving mode such as a fast forward (FF) or a rewind (REW). It is a very practical invention that can be applied to any method, regardless of whether the method, half loading (Half Loading) or unloading (Unloading) method.

Claims (3)

Fast running the tape; Calculating a high speed traveling amount of the tape by detecting an output signal according to rotation of the reel; Reproducing a signal of the tape when the calculated high speed travel amount is a predetermined amount or more; Calculating a reproduction amount of the tape by detecting a control pulse signal recorded on the tape; And And driving the tape at high speed when the calculated reproduction amount is more than a predetermined amount. The method of claim 1, The regeneration step, Moving the tape to a playback position when the calculated high speed travel amount is equal to or greater than a predetermined amount; And And reproducing the tape. The automatic search method of an image-recorded video tape comprising a. The method of claim 1, And the output signal of the high speed travel amount calculating step is a frequency generated according to the rotation of the reel.