KR0165445B1 - Apparatus for copying high speed in the video tape - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying apparatus on videotape, and more particularly, to a videotape high speed copying apparatus for high speed copying of an image signal of a videotape onto another videotape. A videotape high speed copying apparatus includes: a first traveling system which plays back a videotape at a N-times speed by a command of the command input unit and reproduces a video signal; A color signal processor which selects a color signal from the video signal and performs automatic color control; A luminance signal processor for signal processing by passing only a luminance signal among video signals; A monitor unit for monitoring an image signal; A mixing unit for mixing the color signal and the luminance signal; A second traveling system for recording the mixed luminance signal and the color signal on the video tape at a speed of N times; And a controller configured to control the driving of the first traveling system and the second traveling system at a speed of N times by the command of the command input unit. Accordingly, the videotape high speed copying apparatus according to the present invention significantly reduces the videotape copy time by reproducing and copying the videotape at a high speed, and provides a function of monitoring a high speed copying image signal on a TV screen.

Description

Video tape high speed copying device

1 is a block diagram showing a videotape high speed copying apparatus according to the present invention.

2A is a frequency distribution diagram of a color signal and a luminance signal reproduced during playback at 1x speed.

FIG. 2B is a frequency distribution diagram of the color signal and the luminance signal reproduced during playback at N-speed.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a videotape copying apparatus, and more particularly, to a videotape high speed copying apparatus for high speed copying of an image signal of a videotape to another videotape.

In general, a method of copying a videotape uses a method of recording a video signal from another VTR when a video signal reproduced from an original videotape is applied to another VTR. However, the above method is different from the audio tape copying method, and the rotation speed of the videotape is limited according to the recording mode recorded on the videotape. Therefore, there has been a need for a videotape copying time that takes a long time and a need to save a copying time when bulk copying.

An object of the present invention is to provide a videotape high speed copying apparatus which is designed to solve the above problems and which greatly reduces copying time by copying at high speed when copying a videotape.

According to an aspect of the present invention, there is provided a videotape high speed copying apparatus comprising: a command input unit configured to input a tape copying command at N times speed; A first traveling system for reproducing the video signal by playing back the video tape at N-times according to the command of the command input unit; A color signal processor which selects a color signal from the video signal and performs automatic color control; A luminance signal processing unit which processes the signal by passing only the luminance signal among the image signals; A monitor unit for monitoring the video signal; A mixing unit for mixing the low-frequency converted color signal output from the color signal processing unit and the luminance signal output from the luminance signal processing unit; A second traveling system for recording the luminance signal and the color signal mixed by the mixing unit on a video tape at a speed of N times; And a controller configured to control the driving of the first traveling system and the second traveling system at a speed of N times by the command of the command input unit.

DETAILED DESCRIPTION Hereinafter, the present invention will be described with reference to the accompanying drawings.

The videotape high speed copying apparatus shown in FIG. 1 includes a command input unit 100, a control unit 104, a first traveling system 108, a first preamplifier 112, a color signal processing unit 116, and a luminance signal processing unit ( 120, a first mixer 124, a second preamplifier 138, a second traveling system 132, and a monitor signal processor 136.

The color signal processing unit 116 may include a band pass filter 1161 for band-passing only the color signal from the image signal output from the first preamplifier 112, and an automatic color control unit for maintaining a constant level of unstable color signals during high-speed playback ( ACC) 1162.

The luminance signal processing unit 120 is an FM (frequency modulation) EQ (equlizer) that compensates for the frequency characteristics of the high pass filter 1201, the video tape, and the head passing only the luminance signal from the image signal output from the first preamplifier 112. A limiter 1203 which removes noise by converting a luminance signal from the FM EQ unit 1202 and converts it into a square wave, and a REC (record) EQ that attenuates high frequencies to improve characteristics of the luminance signal frequency. (equalizer) portion 1204 is included.

The monitor signal processing unit 136 is output from the ACC unit 1162 and divides the color signal frequency having a stable level into one-half of N, corresponding to N-speed reproduction, and divided into one every N minutes. A monitor color signal processing unit 1362 for processing the color signal in the same way as a general VTR, a second divider 1353 for injecting a luminance signal from which the noise is removed from the limiter unit 1203, and dividing it by 1 every N minutes; The signal processed by the monitor luminance signal processing unit 1362, the monitor color signal processing unit 1362, and the monitor luminance signal processing unit 1362 by FM demodulating the luminance signal divided by the frequency division unit 1363 and performing signal processing in the same manner as the general VTR. And a second mixing unit 1365 for mixing.

Referring to the operation according to the configuration of FIG. 1, when the command input unit 100 receives a copy command of the N-speed video tape, the controller 104 injects a command signal from the command input unit 100 to operate the first traveling system 108. Control to play at NX speed. Accordingly, the first traveling system 108 reproduces the video signal at N speed and outputs the image signal to the first preamplifier 112. The first preamplifier 112 amplifies the weak image signal N times faster than the normal speed so as to process the signal, and then the high pass filter in the band pass filter 1161 of the color signal processor 116 and the luminance signal processor 120. Output to 1201.

In FIG. 2A and FIG. 2B, f1 denotes the frequency of the low-frequency converted color signal at 1x reproduction and f2 denotes the carrier frequency of the FM modulated luminance signal at 1x reproduction. Further, f1 'is a color signal during N-speed reproduction, which is N times f1, and f2' is a carrier frequency of the FM modulated luminance signal during N-speed reproduction, which is N times f2.

Accordingly, the band pass filter 1161 has the characteristics of a band pass filter of a frequency band N times higher than the band of the band pass filter set to pass the low frequency converted color signal frequency during reproduction in a general VTR. N times the color signal frequency passing through the band pass filter 1161 is output to the ACC unit 1162. At this time, since the unstable color signal reproduced at Nx speed is a signal of AM state, driving noise increases during high-speed driving, and to compensate for this, the ACC unit 1162 constantly stabilizes the color signal level and outputs it to the first mix unit. .

On the other hand, the high pass filter 1201 has a characteristic of a frequency band N times higher than that of the high pass filter set to pass the luminance signal frequency at the time of reproduction in the normal VTR. The N-times luminance signal frequency passed through the high pass filter 1201 is compensated for by the FM EQ unit 1202 and attenuation of the frequency characteristic due to the video tape characteristic and the head characteristic is output to the limiter portion 1203.

The limiter 1203 removes the noise generated by the high speed playback, converts the luminance signal into a square wave, and outputs it to the second division unit 1363 and the record EQ unit 1204. The record EQ unit 1204 attenuates the high range in order to improve the characteristics of the luminance signal frequency to be recorded, and then outputs it to the first mix unit 124. The first mixer 124 mixes the luminance signal introduced from the record EQ unit 1204 and the color signal introduced from the ACC unit 1162 to form an envelope signal and then records the second preamplifier so that it can be recorded at an appropriate level. Amplified in 138 and outputs to the second traveling system (138). At this time, the second traveling system 138 receives the video signal output from the second preamplifier 138 under the control of the control unit 104 and records the video signal at N times speed. In addition, when reproducing a video tape recorded in a long playback mode, crosstalk between adjacent channels exists on the tape, and crosstalk is amplified relatively large as it is copied at N times speed. At this time, the generated crosstalk component eliminates crosstalk using a narrow dedicated head suitable for the track width of the high density recording mode.

On the other hand, the first division unit 1361 of the monitor signal processing unit 136 divides the N times the color signal frequency output from the ACC unit 1162 into one-nth the low-frequency conversion which is reproduced at the normal speed in the normal VTR. The color signal is generated and then output to the monitor color signal processor 1362. The monitor color signal processing unit 1362 receives the low-frequency converted color signal, converts the color signal to 3.58 MHz, and processes the color signal in the same manner as the general VTR to apply the signal to the second mix unit 1365. In addition, the second divider 1324 of the monitor signal processing unit 136, which has received a luminance signal N times greater than the luminance signal frequency output at the normal speed playback, is output from the limiter unit 1203. The N times the color signal frequency is divided by one-Nth, converted into the same luminance signal reproduced at the normal speed in the normal VTR, and then applied to the monitor luminance signal processing unit 1164.

The monitor luminance signal processing unit 1362 receives the low-conversion luminance signal, performs signal processing in the same manner as the function of the general VTR, and applies the same to the second mixing unit 1365. The second mix unit 1365 mixes the color signal and the bright signal and outputs a video signal so that the video signal played back at N-speed can be normally monitored on a TV. The video signal can be viewed on a TV using a conventionally known technique.

Accordingly, the videotape high speed copying apparatus according to the present invention significantly reduces the videotape copy time by reproducing and copying the videotape at a high speed, and provides a function of monitoring a high speed copying image signal on a TV screen.

Claims (5)

1. A videotape high speed copying apparatus, comprising: a command input unit for inputting a tape copy command at N-speed; A first traveling system for reproducing the video signal by playing back the video tape at N-times according to the command of the command input unit; A color signal processor which selects a color signal from the video signal and performs automatic color control; A luminance signal processing unit which processes the signal by passing only the luminance signal among the image signals; A monitor unit for monitoring the video signal; A mixing unit for mixing the low-frequency converted color signal output from the color signal processing unit and the luminance signal output from the luminance signal processing unit; A second traveling system for recording the luminance signal and the color signal mixed by the mixing unit on a video tape at a speed of N times; And a controller for controlling the driving of the first traveling system and the second traveling system at a speed of N times according to a command of the command input unit. 2. The videotape high speed copying apparatus according to claim 1, wherein the copying of the videotape recorded in the high density recording mode in the first traveling system and the second running system is copied to a dedicated head having a narrow head width. The videotape high speed copying apparatus according to claim 1, wherein the monitor unit divides the video signal reproduced at Nx speed by N and converts the video signal to the same frequency as the video signal reproduced at 1x speed. The video tape of claim 1, wherein the color signal processor comprises a band pass filter for bandpassing N times the low-pass color signal and an automatic color control (ACC) unit for maintaining a saturation degree of the color signal. High speed copying device. 2. The luminance signal processor of claim 1, wherein the luminance signal processor includes a high pass filter, a video EQ, an FM EQ unit, a record EQ unit, and a limiter unit to remove noise, which is N times higher than the filter area at 1x reproduction. Video tape high-speed copying apparatus characterized in that.