KR19990040705A - Automatic Repeat Playback Method Using Switching Pulse of VSI System - Google Patents

Abstract

The present invention relates to an automatic repetitive reproducing method using a switching pulse of a VSI system, wherein a repetitive reproducing section designated by an automatic repetitive key is stored by counting a switching pulse and then using the count value of the switching pulse. By replaying a predetermined number of times, it is possible to accurately find the starting point of the designated repetition section when rewinding.

To this end, the present invention provides a first step of continuously up-counting a switching pulse until the automatic repeat key is input again while the start point of the section to be repeatedly played by the automatic repeat key is designated during playback. A second step of storing, in a memory means, the number of switching pulses counted up to that time when the end point of the section to be repeatedly played back is input again when the automatic repeat key is input again in the first step; After performing the second step, down-count the number of switching pulses, rewind until the count value becomes zero, and then count up the number of switching pulses already stored while up-counting the number of switching pulses. And a third step of automatically repeating the execution of the playback mode by a specified number of times.

Description

Automatic Repeat Playback Method Using Switching Pulse of VSI System

The present invention relates to a method for counting and storing switching pulses for repetitive reproducing sections designated by a user when reproducing VSI, and to control automatic repetitive reproducing operations in the corresponding section. When the start point of the section to be repeated is designated by the user, the status is displayed on the OSD screen, counting the switching pulses made based on the capstan frequency generator, and then the end point of the section to be repeated is automatically designated by the auto repeat key. The number of switching pulses counted up to that time is stored, and then the automatic repeat operation is executed from the point where the count value of the switching pulse becomes zero to the stored count value by the specified number of times. Accurately find the starting point of the repeat interval without errors The present invention relates to an automatic repetitive reproducing method using a switching pulse of a VSI system.

In general, a VSI system includes a recording / reproducing unit including a video head and an audio head to record or reproduce a video signal and an audio signal provided from a tuner circuit or a line input terminal as shown in FIG. 10) and a video signal processor 20 for separating and processing a broadcast signal tuned by a tuner circuit or a video signal reproduced from a tape of the recording / reproducing unit into a luminance signal and a color signal, respectively, and a switching pulse from the video signal. It includes a vertical synchronous separation unit 21 for separating and providing to the microprocessor, and the OSD processing unit 30 for generating the OSD character in accordance with the control signal of the microprocessor to output to the video output.

And a key input unit 40 having a plurality of digit keys, function keys, and automatic repeat keys to allow a user to set a repeat play function, control deck operation according to the key input signal, process video / audio signals, and OSD. A microprocessor 70 for controlling character generation; a memory unit 50 for storing counter data during tape playback and channel numbers during automatic channel search; and a deck for driving the deck mechanism in accordance with a control signal of the microprocessor. The drive part 60 is provided.

FIG. 2 is a block diagram of a switching pulse generation circuit including a capstan frequency generator and a microprocessor, and FIG. 3 is a reference diagram for explaining a relationship between the capstan frequency generator and the switching pulse waveform, which is output from the capstan frequency generator 61. Based on the frequency, the microprocessor 70 is generating a switching pulse for controlling the head switching operation.

FIG. 4 is a waveform diagram showing various signals used in each part of the VSI system, which shows a control pulse CTL, a vertical synchronizing signal V.SYNC, and a switching pulse waveform SW.PULSE.

In the repeated playback operation performed in the conventional VSI system having such a configuration, when the automatic repeat key is input through the key input unit 40 while the playback mode is in operation, the microprocessor 70 starts repeating playback of the tape count value at that time. At the point where the memory unit 50 is stored as a point, and the automatic repeat key is input again later, the tape count value at that time is stored in the memory unit 50 as the end point of the repeated playback, and the playback starts while checking the tape count value. By returning the tape to the point, the playback operation from the start point to the end point of the corresponding section is executed. After the playback operation is executed for the designated number of times, the normal playback mode is executed again.

However, in the VSI system that repeats the play using the tape count value as described above, the tape error does not stop exactly at the actual starting point due to a counter error, but stops after a little more than the starting point. As the number of repetitions increases, or when the tape driving mode is recorded and recorded in the constant speed mode and the double speed mode, or in the constant speed mode and the triple speed mode, there is a problem that the counter error as described above becomes larger during playback.

Therefore, the present invention was created to solve the above problems, and the present invention provides a message indicating that the automatic repeat start point is designated when the playback point is designated by the automatic repeat key on the OSD screen. Counts the switching pulses generated to control the switching operation of the head, and if the end point of the section to be repeatedly played by the automatic repeat key is designated again, the automatic repeat play operation is performed by the specified number of times using the number of switching pulses counted up to that time. It is an object of the present invention to provide an automatic repetitive reproducing method using a switching pulse of a VSI system capable of accurately searching and reproducing a starting point of a specified repetition section without an error when performing rewinding for repetitive reproducing.

In order to achieve the above object, according to the present invention, when a start point of a section to be repeatedly played is designated by an automatic repeat key during playback, the present invention displays the state on the OSD screen and up-counts the switching pulse until the automatic repeat key is input again. Stage 1; A second step of storing, in a memory means, the number of switching pulses counted up to that time when the end point of the section to be repeatedly played back is input again when the automatic repeat key is input again in the first step; After executing the second step, the number of switching pulses already stored are counted while down-counting the number of the switching pulses, rewinding the count value to zero, and then counting up the number of switching pulses again. It provides a method for automatically repeating playback using a switching pulse of a VSI system comprising a third step of automatically repeating the execution of the playback mode up to a specified number of times.

1 is a block diagram schematically showing some components of a VSI system for explaining the present invention.

2 is a block diagram of a switching pulse generation circuit consisting of a capstan frequency generator and a microprocessor.

3 is a reference diagram for explaining a relationship between a capstan frequency generator and a switching pulse waveform.

FIG. 4 is a waveform diagram illustrating various signals used in each part of the VSI system. FIG.

5 is an operation flowchart for explaining an automatic repetitive reproducing method using a switching pulse of a VSI system according to the present invention

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

10: recording / playback section 20: video signal processing section

21: vertical synchronization separator 30: OSD processing unit

40: key input unit 50: memory unit

60: deck drive unit 61: capstan frequency generator

70: microprocessor

Hereinafter, a method for automatically repeating playback using a switching pulse of a VSI system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a flowchart illustrating an automatic repetitive reproduction method using switching pulses of a VSI system according to the present invention, wherein the microprocessor 70 of FIG. 1 uses an oscillation frequency provided by a capstan frequency generator 61. Shows the overall flow of automatic repeat playback operation.

In the above operation flow, if the start point of the section to be repeatedly played in the reproducing state is designated, the first step of up-counting the switching pulses obtained based on the oscillation frequency = number of the capstan frequency generator while displaying the state on the OSD screen ( (S211-S215), a second step (S216) of storing the count value of the switching pulses up to that point if the end point of the subsequent reproducing section is designated, and the start point of the reproducing section based on the count value of the switching pulse. This operation can be described by dividing the operation of returning the tape to the end point already stored in the third step (S217-S222) which automatically repeats the specified number of times.

Here, the first step is to determine whether the automatic repeat key is input by checking the key input state while executing the play mode (S212, S212), and the start of the section to be repeatedly played by the automatic repeat key in the determination step. If the point is designated, displaying the state on the OSD screen (S213), up-counting the switching pulses at the same time as the display operation (S214), and performing the reproducing operation while performing the counting operation and then entering the key input state. It can be seen that the check is made in step S215 to determine whether the automatic repeat key is input again.

The second step is executed when the automatic repeat key is input again in the first step and the end point of the section to be repeatedly played is designated. The number of switching pulses counted up to the present after the up-count operation is stopped is stored. It can be seen that step S216 is stored in the means.

The third step is to repeat playback using the switching pulse count value memorized in the second step, and down-counting the number of the switching pulses and performing a rewinding operation until the count value becomes zero. Steps S217 and S218, and when a point at which the count value of the switching pulse becomes zero is detected, executing the regeneration mode to the point at which the number of switching pulses already stored is counted up-counting again. S219 and S220, and when the playback is completed to the end of the designated section, it is determined whether the number of repetitive playbacks has been increased by one and the number of replays has been reproduced by the specified number of times, and it is determined whether to perform the rewind and playback operations again or end the operation according to the determination result. It can be seen that the step (S221, S222).

The operation of the present invention as described above is as follows.

First, in the present invention, when the automatic repetition key is input through the key input unit 40 while the tape reproducing mode is in progress (Y branch of S212), the microprocessor 70 recognizes the starting point as the start point of the repetitive reproducing section. The OSD processing unit 30 displays a message indicating that the auto-repeat start time point is set in OSD characters (S213).

The microprocessor 70 checks the key input state again (S215) and automatically repeats the switching pulse as shown in FIG. 4 generated based on the oscillation frequency provided from the capstan frequency generator 61 (S215). When the key is input again and the end point of the repeated playback section is designated (Y branch in S215), the count operation for the switching pulse is stopped and the number of switching pulses counted up to now is stored in the memory unit 50 (S216). In addition, the microprocessor 70 has the number of switching pulses counted during the user-specified repeated reproduction period.

Thereafter, the microprocessor 70 down-counts the number of the switching pulses and controls the deck driver 60 to execute the rewind mode until the count value becomes zero (S217). When a point at which the count value of the switching pulse becomes zero is detected during the rewinding operation as described above (Y branch of S218), the regeneration mode is executed again and the number of switching pulses in the corresponding section is up-counted. S219), and the count value is reproduced up to the point where the number of switching pulses already stored in the memory unit 50 is counted, thereby performing one regeneration operation for the specified repetition section.

Therefore, when one playback is completed to the end of the designated section as described above (Y quarter in S220), the repeat playback count counter is increased by one (S221) and compared with the specified number of times (S222) to determine whether the playback has been performed a specified number of times. If the number of repetitions is smaller than the specified number of times (N branch of S222), the process returns to the step of rewinding and executing the replaying operation. The operation ends and the normal playback mode can be executed (S223).

According to the present invention as described above, if the start point of the section to be repeatedly played by the automatic repeat key during playback is designated by the user, the count operation for the switching pulse is immediately started, and then the end point of the section to be repeatedly played by the automatic repeat key again. By counting until this is specified, the automatic repeating operation is performed by the designated number of times by using the number of the switching pulses, so that there is an advantage that the starting point of the designated repeating section can be accurately and accurately visited.

Claims (1)

When the start point of the section to be repeated is designated by the auto repeat key during playback, the status is displayed on the OSD screen and the counting pulse generated based on the oscillation frequency of the capstan frequency generator is up-counted until the auto repeat key is input again. The first step to do; A second step of storing, in a memory means, the number of switching pulses counted up to that time when the end point of the section to be repeatedly played back is input again when the automatic repeat key is input again in the first step; After executing the second step, the number of switching pulses already stored are counted while down-counting the number of the switching pulses, rewinding the count value to zero, and then counting up the number of switching pulses again. An automatic repeat playback method using a switching pulse of a VSI system comprising a third step of automatically repeating the execution of the playback mode up to a specified number of times.