KR20000033708A - Method for section repeat reproduction of vcr - Google Patents

Abstract

PURPOSE: A method for section repeat reproduction of VCR is provided to reproduce accurately a repeated section by using an FG signal without a CTL signal. CONSTITUTION: A method for section repeat reproduction of VCR comprises the following steps. An arbitrary starting point for a section repeat reproduction is selected when reproducing a video tape. A CTL(Control signal) pulse is counted from the selected point. An arbitrary ending point for a section repeat reproduction is selected when reproducing the video tape. The number of counted CTL pulse is stored to a memory. The video tape is rewound and the CTL pulse is counted. The number of an FG pulse generated from a capstan motor is counted and the existence of the CTL pulse in the next section is determined if the counted CTL pulse number is less than the counted number stored in the memory. The counted FG pulse number is counted as one CTL signal if there is not the CTL pulse in the next section and the counted FG pulse number reaches a predetermined FG pulse number. The section repeat reproduction is determined and performed if the counted CTL pulse number is equal to the CTL pulse number stored in the memory.

Description

How to repeat the play of V seeds

The present invention relates to a method of repeating a section of a video cassette recorder (hereinafter referred to as a VCR), in particular, a control signal (CTL) recorded in a control track of a video tape and a frequency generator generated from a capstan motor. It relates to a section repeat playback method of the VCR to search the initial position of the section designated by the user by using the () signal.

In general, the repeat play function of a VCR and an audio cassette is to play back audio / video data recorded on a recording medium, and then allow a user to play or listen to the previous audio / video data for a certain period of time. Various developments are being made for language use.

The repeated playback method of the VCR will be described with reference to the accompanying drawings.

A user inserts a recording medium into the playback apparatus, turns on the power of the playback apparatus, and selects a play mode of the playback apparatus. Here, the recording medium means a general video tape, and the playback device means a VCR.

After the reproduction mode is selected, audio / video data recorded on a recording medium is displayed on an image display device.

When the user wants to watch only the section by repeatedly playing back the audio / video data of a certain period previously displayed, other than the audio / video data currently being displayed among the audio / video data displayed as above. Switch the current playback mode to stop mode.

After switching to the stop mode, the user selects the Review mode again to perform the reverse scan operation of the tape. Here, the review mode may be selected without stopping the play mode.

This is because the user searches for a certain period of time that the user wants to play again. At this time, the progress speed of the tape is reverse searched at a speed that allows the user to sufficiently search the contents of the screen.

During the reverse search, it is determined whether the screen of the initial position of the predetermined section that the user wants to play repeatedly is searched.

As a result of the user's determination, if the initial position of the section to be played repeatedly is not searched, the above operation is repeatedly performed, and if the initial position of the predetermined section to be played repeatedly is searched, the review operation mode is in progress. By selecting the stop mode, the operation is stopped, and the play mode is selected again to display the video display device from the initial position to be repeatedly played.

At this time, since the initial position of the predetermined section to be repeated playback should be determined by the eyes of the user, it is difficult to select the initial position of the correct section, and the troublesome and duplicated problem in which the user repeatedly performs the above-described operation is required. This was there.

Therefore, in order to solve such a problem, the conventional method is to perform the interval repeat playback by using a method of counting control signals recorded on a control track of a tape.

With reference to the accompanying drawings for a section repeat playback method by the count of the control signal as described above.

1 is a block diagram of a block repeating apparatus of a conventional VCR repeater, and FIG. 2 is a flowchart illustrating an operation of a method of repeating a repeating segment VCR according to the prior art.

First, when the power of the VCR is turned on, a recording medium (video tape) is inserted into the playback device (deck), and a playback key is selected through the key input unit 10 to input the playback mode signal to the controller 11. The control unit 11 controls the playback unit 12 to reproduce the video / audio signal recorded on the video tape by the video and audio heads (S102). Here, the reproduction of the video and audio signals is performed in accordance with the control signal recorded in the control track by the control head 13.

Subsequently, during playback, the controller 11 determines whether a start position for interval repeat playback is designated by the repeat mode key of the key input unit 10, that is, whether the repeat mode key signal is input (S103), and the determination result. When the repeat mode signal for specifying the start position for the interval repeat play is input, the video / audio signal is reproduced while counting the control signal CTL reproduced by the control head from the designated position (S104).

As described above, the control unit 11 determines whether a repetition mode key signal for designating an end point of the interval repeat play is applied through the key input unit 10 while playing the video / audio signal while counting the control signal (S105). When the key input signal for designating the end position of the section repeat playback section is input, the control unit 11 switches the playback mode to the stop mode, and then the control signal counted so far is called CTL. Number) is stored in the storage unit 14 (S106).

When the storage is completed in the storage unit 14, the control unit 11 switches the stop mode to the rewind mode, and then rewinds the video tape and counts the CTL signals reproduced by the control head (S107). .

Next, it is determined whether the number of counted CTL signals is equal to the number of control signals stored in the storage unit 14. That is, after determining whether it is rewinded to a start position for performing the section repeat play operation (S108), and if it is rewinded to a designated section repeat play start position (when the number of counted CTLs is equal to the number of CTLs stored in the storage unit 14), The control unit 11 switches the rewind mode to the regeneration mode to perform the interval repetitive regeneration operation from the corresponding point to the specified end position (S109).

As a result, the VCR repeating method according to the prior art counts the number of CTL pulses from the start position to the end position when the start position and the end position of the tape for the interval repeat playback are specified during video tape playback. Rewind the number to search the starting position.

According to the conventional repeat method of repeating playback according to the prior art, when rewinding to the start position after playing back to a specified end position, when the video tape is old and the CTL signal cannot be read correctly, it may not be stopped accurately at the start position and excessively occurs. do. At this time, if there is no signal section (section where no CTL signal is recorded) in the front section of the start position, it is continuously rewinded to determine the point where the next CTL is recorded as the start position of the section repeat playback section, and then repeat section repeat playback. By performing the operation, there is a problem in that the user cannot repeatedly play a desired section.

Accordingly, an object of the present invention is to solve the above problems according to the prior art. An object of the present invention is to count a CTL signal while counting a CTL signal while rewinding one section of the videotape to the start position of the section. The present invention provides a method for repeating a section repeating of a VCR which performs section repeat playback by accurately searching a start position of a section using an FG signal generated by a capstan motor when an error occurs.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram schematically showing a block repetition apparatus of a V seed according to the prior art.

2 is a flowchart illustrating an operation of a method for repetitively reproducing an interval of a V seed according to the related art.

3 is a schematic block diagram of an apparatus for implementing a method for repeatedly repeating a section of V seed according to the present invention.

4 is a diagram showing a control signal CTL reproduced by a control head and an FG signal of a capstan motor existing within one period of the control signal.

5 is a flowchart illustrating an operation of a method for repetitively reproducing an interval of V seeds according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

10: key input unit 11: control unit

12: playback unit 13: control head

14: storage unit 15: Charleston motor

In the method of repeatedly repeating a VCR according to the present invention for achieving the above object, in the method of repeatedly playing a VCR having a capstan motor and a memory, selecting a start point of an arbitrary section for interval repeat playback during videotape playback. Counting the CTL pulses from the selected point; Counting the number of CTL pulses and counting the CTL pulses while rewinding the video tape while storing the counted number of CTL pulses in the memory when selecting an end point for repeat play during video / audio signal reproduction; When the number of CTL pulses counted during rewind of the video tape is counted less than the number of CTL pulses stored in the memory, the number of FG pulses generated by the capstan motor is counted and it is determined whether there is a CTL pulse in a subsequent section. Making a step; Counting the CTL signal as one CTL signal when the CTL signal is not detected in a subsequent section and the counted number of FG pulses reaches a predetermined number of FG pulses existing within one period of the CTL pulses; When the counted number of CTL pulses is equal to the number of CTL pulses stored in the memory, the number of CTL pulses may be determined as a start position of the interval repeating playback section, and may be achieved by performing a section repeat playback operation from the corresponding point.

Hereinafter, with reference to the accompanying drawings with respect to the repeated playback method of the VCR according to the present invention will be described in detail.

FIG. 3 is a view schematically showing a control block configuration for implementing a VCR repeating method according to the present invention, and FIG. 4 is a diagram illustrating a control signal CTL reproduced by a control head and an FG signal generated from a capstan motor. 5 is a view showing waveforms, and FIG. 5 is a flowchart illustrating an operation of a method for repeating a section repeating operation of a VCR according to the present invention.

First, when the power of the VCR is turned on, a recording medium (video tape) is inserted into the playback device (deck), and a playback key is selected through the key input unit 10 to input the playback mode signal to the controller 11. The control unit 11 controls the playback unit 12 to reproduce the video / audio signal recorded on the video tape by the video and audio heads (S202). Here, the reproduction of the video and audio signals is performed in accordance with the control signal recorded in the control track by the control head 13.

Subsequently, during playback, the controller 11 determines whether a start position for interval repeat playback is designated by the repeat mode key of the key input unit 10, that is, whether the repeat mode key signal is input (S203), and the determination result. When the repetition mode signal for specifying the start position for the interval repeat play is input, the video / audio signal is reproduced while counting the control signal CTL reproduced by the control head from the designated position (S204).

As such, the control unit 11 determines whether a repetition mode key signal for designating an end point of the interval repeat playback while the video / audio signal is being reproduced while counting the control signal is applied through the key input unit 10 (S205). In response to the determination result, when a key input signal for designating the end position of the section repeat playback section is input, the controller 11 switches the playback mode to the stop mode, and then stores the number of CTL signals counted so far. ) Is stored in step S206.

When the storage is completed in the storage unit 14, the control unit 11 switches the stop mode to the rewind mode, and then rewinds the video tape and counts the CTL signals reproduced by the control head (S207). .

Subsequently, it is determined whether the counted CTL pulse number is counted to a predetermined number less than the number of CTL pulses stored in the storage unit 14. That is, it is determined whether the video tape has been rewound from the start position to a position t seconds ago (S208).

For example, assume that the number of CTLs stored in the storage unit 14 is 30, and assume that the number of CTLs from a start position up to t seconds ago is set to 25. At this time, when the videotape is rewound to search from the end position designated for the interval repeat playback to the start position, it is determined whether the counted CTL number reaches a time when the set number of CTLs is counted as 25.

As a result of the determination, when the video tape is unwound up to t seconds before the set start position is reached, i.e., when a CTL signal having a predetermined number less than the number of CTLs stored in the storage unit 14 is counted, as shown in FIG. The number of FG (Frequency Generat or) signals generated by the same capstan motor 15 is counted (S209), the FG pulse is counted, and at the same time, it is determined whether a control signal is detected in a subsequent section (S210).

As a result of the determination, when the CTL signal is detected, if the CTL counted as in the related art is continuously counted until the same number of CTLs stored in the storage unit 14 are counted, and the same number of CTL signals are counted, the rewind mode is reset. Switch to to perform the repeated playback operation.

However, if the CTL signal is not detected in step S210, after determining whether there is a predetermined number N included in one cycle of the CTL signal, the FG signal counted in step S209 is shown in FIG. 4. In operation S211, when the predetermined number N of the FG signal is counted, it is determined as one CTL signal to increase the counted CTL value by +1 (S212).

In this way, by counting the FG signal and continuously increasing the CTL value, if the counted CTL is equal to the number of CTLs stored in the storage unit 14 (S213), the rewind mode is determined as the start position of the section repeat playback section specified by the user. After switching to the playback mode, the section repeat playback operation is performed (S214).

As a result, in the VCR repeating playback method according to the present invention, when the user performs the section repeat playback operation by specifying the start position and the end position to perform the section repeat play, the playback is completed to the end point and then rewinded to the start position. Done. At this time, a plurality of capstan FG signals exist depending on the type of capstan motor (usually dozens) in one cycle of the CTL. That is, starting the rewind and controlling the CTL to determine the presence or absence of the CTL by determining the number of FG signals from the position t seconds before the start point (which can be changed according to the program of the controller 11), and the presence of the CTL signal. While the CTL signal is counted to search the start position, when there is no CTL signal, the start position of the video tape is searched as an FG signal.

For example, if there are 30 FG signals in one CTL, it is determined whether there is a CTL for every 30 FG signals, and if there is no CTL, the CTL count is counted as one CTL for every 30 FG signals.

As described above, in the VCR repeating playback method according to the present invention, when rewinding to search the starting position at the end point of the interval repeating section, the CTL signal is counted and the number of CTLs corresponding to the starting position of the section is fixed. When a small number of CTL signals are counted, it is determined whether a CTL signal exists in a subsequent section, and if a CTL signal exists, the CTL signal is counted to search for a start position, and when a CTL signal does not exist, a capstan motor is generated. When the FG signal is counted and an arbitrary number of FG signals are counted, it is determined as one CTL signal to search for the start position of the repeat playback section.

Therefore, even if the video tape is used for a long time and the CTL signal cannot be read, there is an advantage that the start position of accurate repeat playback can be searched using the FG signal.

Claims (1)

In the repeated playback method of a VCR with a stonstone motor and a memory, Counting a CTL pulse from the selected point when selecting a start point of an arbitrary section for interval repeat play during videotape playback; Counting the number of CTL pulses and counting the CTL pulses while rewinding the video tape while storing the counted number of CTL pulses in the memory when selecting an end point for repeat play during video / audio signal reproduction; When the number of CTL pulses counted during rewind of the video tape is counted less than the number of CTL pulses stored in the memory, the number of FG pulses generated by the capstan motor is counted and it is determined whether there is a CTL pulse in a subsequent section. Making a step; Counting the CTL signal as one CTL signal when the CTL signal is not detected in a subsequent section and the counted number of FG pulses reaches a predetermined number of FG pulses existing within one period of the CTL pulses; When the counted CTL pulses are equal to the number of CTL pulses stored in the memory, the point is regarded as the start position of the section repeat play section, and the section repeat playback operation is performed from the corresponding point. Repeat play method.