KR0132886B1 - Method and apparatus of rapid reproduction of video signal - Google Patents

Abstract

Disclosed is a high speed play-back device for an image signal and method thereof. The method includes a multiple speed setting step which sets a multiple speed unit(K), a track number calculation step which calculates a track number(n) to skip from the multiple speed unit(K), a control step which controls so that a track section having a image signal of 1 field volume per the multiple speed unit(K) can be played back with normality and also so that a high speed play-back can be performed during the rest of the multiple speed play-back, a play-back signal storing step which stores the image signal picked up during the normal play-back time, and a display control step which displays the stored image signal when controls to play back with high speed during the multiple speed play-back. Thus, high speed play-back display of high quality and clearness can be provided.

Description

High speed playback device and method of video signal

1 is a diagram showing the head trajectory during normal reproduction.

2A-2C are waveform diagrams showing envelopes of reproduction signals in FIG.

3 is a diagram showing the head trajectory at the reverse speed of 7 times.

4 is a waveform diagram showing an envelope of a reproduction signal in FIG.

5 is a head trajectory diagram at 3.5x speed for explaining a high speed reproduction apparatus of a video signal according to the present invention.

6A and 6B are waveform diagrams showing signals for calculating the number of tracks skipped in FIG.

7 is a diagram showing the head trajectory when ignoring two head reads during double speed playback.

8 is a block diagram showing an embodiment of a high speed reproduction apparatus of a video signal according to the present invention.

9 is a flowchart showing a high speed reproduction method of a video signal according to the present invention.

* Explanation of symbols for main parts of the drawings

10 tape 20 head

30: playback amplification means 40: video signal processing means

50: analog / digital conversion means 60: memory means

70: digital / analog conversion means 80: display means

90: automatic track tracking means 100: track calculation means

110: control means 120: servo means

130: motor driving means 140: motor

150: double speed input means

The present invention relates to a video recording and reproducing apparatus, and more particularly, to a high speed reproducing apparatus and method for providing a high quality reproduction screen during high speed reproduction.

In general, in the video cassette recorder (VCR) employing the double azimuth recording method, the head trace and the envelope of the playback signal for playing back a tape recorded in the double azimuth recording method at a normal speed are shown in FIGS. 1 and 2. The head trajectory and the envelope of the reproduction signal at the reverse 7 times speed are shown in FIG. 3 and FIG.

In the video cassette recorder (hereinafter referred to as VCR) adopting the double azimuth recording method as shown in FIG. 3 and FIG. 4, the tape moves faster than normal playback in double speed playback, so that the head cannot read one end to the end. Since the azimuth angle cannot read the video signals of other tracks because it continues to move to other adjacent tracks, (K-1) / 2 noise bars are displayed on the playback screen at the Kx speed. There was a problem that occurred.

In the case of the digital VCR, when a part of the signal is lost due to data compression, a completely different screen is formed.

Accordingly, an object of the present invention is to store the information of 1 field per double speed set in high speed playback in the memory and to display the video signal stored in the memory while skipping the track according to the set double speed unit to solve the above problems. A high speed reproduction method of a video signal for providing a reproduction screen of the present invention.

Another object of the present invention is to provide a high speed reproducing apparatus most suitable for realizing the high speed reproducing method of the video signal in order to solve the above problems.

In order to achieve the above object, the present invention provides a high speed reproduction method of a video signal for quickly reproducing the video signal recorded from a tape on which one field video signal is recorded on at least one track. ), A speed calculation process for calculating the number of tracks (n) to be skipped from the double speed unit (K) set in the double speed setting process, the image for the one field per double speed unit (K) A control period for controlling normal reproduction and a high speed reproduction during the remaining double speed reproduction period, a reproduction signal storing process for storing a video signal picked up during the normal reproduction period, and A display control process for displaying the stored video signal during the high speed playback control during the double speed playback period; It is characterized by including.

In order to achieve the above another object, the present invention provides a high speed playback apparatus of a video signal for quickly reproducing the video signal recorded from a tape on which one field video signal is recorded on at least one track. K) input speed input means for inputting K, track counting means for calculating a track n to be skipped from the speed input unit K inputted from said speed input input means, and for said one field per said transmission speed K Control means for controlling normal reproduction is made for the track period in which the video signal is recorded, and for high speed reproduction during the remaining double speed reproduction period, and controlled by the control means to reproduce the normal reproduction from the tape per double speed unit (K). Memory means for storing the video signal, the control signal output from the control means as an input to control the running of the tape Characterized in that it comprises a capstan motor, and a display means for displaying only a video signal outputted from the memory means while the rest of the double-speed reproduction period.

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

FIG. 5 is a diagram showing the head trajectory in the case of 3.5x speed for explaining the high speed playback apparatus of a video signal according to the present invention. For convenience, it is assumed that a video signal corresponding to one field is loaded on one track.

In FIG. 5, a track containing a video signal of one field having the same azimuth angle is normally reproduced by the first head CH A, and then six tracks are recorded by the second head ( Repeating skip to CH B).

6A and 6B are waveform diagrams showing signals for calculating the number of skipped tracks in FIG. 5, FIG. 6A is a waveform diagram showing control signals in a VCR of a VHS system, and FIG. A waveform diagram showing an error signal of tracking (ATF).

FIG. 7 is a diagram showing the head trajectory when ignoring two head reads during double speed reproduction, and has an effect of reproducing at a higher speed.

8 is a block diagram showing an embodiment of a high speed reproduction apparatus of a video signal according to the present invention.

The block diagram shown in FIG. 8 includes amplifying means 30 for amplifying the video signal recorded on the tape 10 using the head 20, and a video signal output from the amplifying means 30. As shown in FIG. Image signal processing means 40 for signal processing to enable reproduction, analog / digital conversion means 50 for converting a signal output from the video signal processing means 40 into a digital signal, and analog / digital conversion. Memory means 60 for storing the signal output from the means 50, digital / analog conversion means 70 for converting the signal output from the memory means 60 into an analog signal, and digital / analog conversion means. Display means (80) for displaying a signal output from the (70) on the screen, automatic track tracking (ATF) means (90) for automatically tracking the track of the signal output from the amplification means (30), Automatic track tracking (ATF) means ( A track counting means 100 for calculating the number of tracks skipped from the signal output at 90), a double speed input means 150 for inputting a double speed unit K, a track counting means 100 and a double speed A control means 110 for controlling the high speed regeneration mode by inputting a signal output from the input means 150, a servo means 120 for inputting a control signal output from the control means 110, and a servo means ( It is composed of a motor driving means 130 for driving the capstan motor 140 by the input signal output from the 120.

9 is a flowchart illustrating a high speed reproduction method of an image signal according to the present invention. Steps 190 to 200 are processes for setting a double speed unit K, and step 210 is a track to skip from a set double speed unit K. In the process of calculating the number n, steps 220 to 230 are processes for storing the reproduced signal by reproducing the tape at a normal speed by the track corresponding to one field, and step 240 is the process of calculating the track. The process of driving the tape at high speed corresponding to the calculated number of tracks n is performed, and steps 250 to 260 are processes for determining whether the number of tracks n calculated in the track counting process has passed.

Next, the operation of the present invention will be described with reference to FIG. 8 and FIG.

First, when the speed reproduction mode is set (step 190), the speed unit K is input from the speed input unit 150 (step 200).

The track counting means 100 calculates how many tracks were skipped from the tape 10 through the head 20 and inputs them to the control means.

The control means 110 calculates the number of tracks to be skipped (n = 2K-1) when the speed unit K is input (step 210), and the capstan so that the tape travels at a normal speed by the track corresponding to one field. After controlling the motor 140 (step 220), the image signal to be read is controlled to be stored in the memory means 60 (step 230), and then the capstan motor 140 is moved so that the running speed of the tape becomes n times speed. In step 240, the read data is ignored. In addition, the number of tracks n calculated in step 210 and the signal output from the track number calculating means 100 are compared, and normal playback during the track corresponding to one field corresponding to the double speed unit K, (2K- 1) The control is performed such that the high speed playback can be repeated during the track (step 250).

The motor driving means 130 varies the rotation speed of the capstan motor 140 according to the control signal output from the control means 110.

In summary, during the high speed playback mode, the running speed of the tape (or the rotation speed of the capstan motor) is changed from normal speed to high speed to normal speed to high speed. Repeated as In this way, even if the running speed of the tape changes from the high speed playback speed to the normal playback speed, the scanning path of the head and the track of the tape coincide with each other.

Therefore, when the running speed of the tape is the normal playback speed, data corresponding to one field recorded on the tape company is read and stored in the memory, and the stored data is read to form one still image, and the running speed of the tape ( Or the rotation speed of the capstan motor) is changed from the normal playback speed to the high speed playback speed so that the still image that is already configured is maintained until the next normal playback speed is reached. Since a technology for constituting a still picture and maintaining a still picture that is already configured is well known, a description thereof will be omitted here.

When the main speed of the tape reaches the next normal playback speed, new data on the tape is read and stored in the memory, and the stored data is read to form a new still picture.

As described above, in the high speed playback apparatus and method of the video signal according to the present invention, a track corresponding to one field during double speed playback is reproduced at a normal speed, stored in a memory, and skipped at a high speed for a predetermined track according to the set double speed unit By displaying only the data stored while there is an advantage that can provide a high-quality clear high-speed playback screen.

Claims (12)

A high speed reproduction method of a video signal for quickly reproducing the video signal recorded from a tape on which one field video signal is recorded on at least one track, the speed setting step of setting a double speed unit (K), A track counting process for calculating the number of tracks (n) to be skipped from the speed unit (K) set in the speed setting process, and the track period in which the video signal for one field per recording speed unit (K) is recorded is normally reproduced. And a control process for controlling high speed playback during the remaining double speed playback period, a playback signal storage process for storing the video signal picked up during the normal playback period, and a video signal stored in the playback signal storage process. A display control process for displaying during high speed reproduction control during double speed reproduction period; How to play. The high speed reproduction method of a video signal according to claim 1, wherein the number of tracks (n) in said track calculation process is (2K-1) / 2 with respect to said double speed unit (K). The method of claim 1, wherein the process of calculating the number of tracks uses a number of control signals or an error signal of automatic track tracking (ATF). The high speed reproduction method of a video signal according to claim 1, wherein the remaining double speed reproduction period is a track of (2K-1) with respect to the double speed unit (K). The high speed reproduction method of a video signal according to claim 1, wherein the control process controls the head picked up the video signal for one field and the head picked up the video signal during the high speed playback period. The method of claim 1, wherein the control process controls the plurality of heads provided in the apparatus to be alternately selected to pick up the video signal stored in the playback signal storage process. . A high speed reproducing apparatus of a video signal for quickly reproducing the video signal recorded from a tape on which at least one field video signal is recorded on at least one track, comprising: double speed input means for inputting a double speed unit (K); Track counting means for calculating the number of tracks (n) to be skipped from the double speed unit (K) input from the double speed input unit, and a track period in which the video signal for one field per recorded single speed unit (K) is recorded is normal. A control means for controlling a high speed reproduction during the remaining double speed reproducing period, and a memory for storing a video signal normally reproduced from the tape per the double speed unit (K) by the control means. Means, a capstan motor for controlling the running of the tape by inputting a control signal output from the control means, and the remaining double speed reproduction period And display means for displaying only a video signal output from said memory means. 8. The high speed playback apparatus of a video signal according to claim 7, wherein the track number n of said track calculating means is (2K-1) / 2 with respect to said double speed unit (K). 8. The high speed reproduction apparatus of a video signal according to claim 7, wherein said track number calculating means uses the number of control signals or an error signal of automatic track tracking (AFT). 8. The high speed reproduction device for a video signal according to claim 7, wherein the remaining double speed reproduction period is a track of (2K-1) with respect to the double speed unit (K). 8. The high speed playback apparatus of a video signal according to claim 7, wherein said control means controls such that the head picked up the video signal for one field and the head picked up the video signal during the high speed playback period are different from each other. 8. The high speed reproducing apparatus of claim 7, wherein the control means controls the plurality of heads provided in the apparatus to be alternately selected to pick up the image signal stored in the memory means.