KR19990016205A - Multiple video signal simultaneous recording device and its selective playback device - Google Patents

Abstract

The present invention is to be applied to a character screen or a plurality of surveillance cameras to record a plurality of video signals input through a plurality of cameras on a single tape, and to selectively reproduce them, and to simultaneously record multiple video signals. The apparatus receives Y / C separation means for receiving three different image signals into luminance signal (Y) and chroma signal (C), and performs spherical amplitude modulation (QAM) by receiving first and second luminance signals. A phase modulation signal generating means for mixing, and mixing means for receiving a third luminance signal and a chroma signal and mixing them and outputting them to a recording system for recording on a tape as one video signal,

The multiple video signal selective playback apparatus includes Y / C separation means for separating the output signal from the reproduction system into corresponding first luminance signals and chromaticity signals, burst phase detection means for outputting burst signals, and A synchronous separation means for outputting a synchronous signal, a color decoder for receiving the chroma signal and outputting the second and third luminance signals, and adding a synchronous signal to the second and third luminance signals and adding the original luminance signal and level Level adjusting means for performing the adjustment so as to be equal, and switching means for selectively outputting the first, second and third luminance signals in accordance with an external selection signal.

Description

Multiple video signal simultaneous recording device and its selective playback device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-video signal simultaneous recording apparatus and a selective reproducing apparatus for application to a character screen or a plurality of surveillance cameras. In particular, a plurality of video signals input through a plurality of cameras are recorded on one tape. The present invention relates to a multiple video signal simultaneous recording device and a selective playback device capable of being selectively played back.

In general, in order to record an image signal on a magnetic tape, it is used as a signal that is easy to record, and is divided into a luminance signal and a chroma signal. In this case, the luminance signal is distributed from 0 to 4 MHz, but the chroma signal has a limited bandwidth around 3.58 MHz.

On the other hand, where a plurality of sensing cameras are used, such as a bank or a public office, a recording device is individually connected to each camera and a tape is recorded. Therefore, a large number of tapes are required and a place for storing the tapes also needs to be large, resulting in an increase in recording cost.

In addition, there is a problem in that two VCRs are used in the reproduction operation of the video signals input from two cameras, or because a plurality of VCRs must be played while exchanging tapes in one VCR.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its object is to simultaneously convert multiple video signals inputted through three cameras into a single video signal and simultaneously record on one tape. It is to provide a recording device.

Another object of the present invention is to provide a multiple video signal selective playback apparatus for selecting and playing back one video signal from a plurality of simultaneous video signals.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the configuration of a multiple video signal simultaneous recording apparatus and its selective playback apparatus according to the present invention.

＊ Explanation of symbols on main parts of drawing

111,112,113: Y / C separation part 121,122: analog / digital conversion part

131,132: first-in, first-out memory 140: color encoder

150: first mixer 160: digital-to-analog converter

170: second mixer 180: recorder

210: regeneration system 220: Y / C separation means

230: burst phase detection means 240: synchronous separation means

250: color decoder 260: level adjusting means

270: switching means

According to a first aspect of the present invention for achieving the above object, the Y / C (Luminance and Chroma) separation means for receiving three different image signals are separated into a luminance signal (Y) and a chroma signal (C) And phase modulated signal generating means for receiving the first and second luminance signals outputted from the Y / C separating means and performing quadrature amplitude modulation (QAM) to mix them, and outputting them from the Y / C separating means. And mixing means for receiving the third luminance signal and the chroma signal outputted from the phase modulation signal generating means, mixing them, and outputting them to a recording system for recording on a tape as one image signal. Provide the device.

In this case, it is preferable that the Y / C separation means comprises first, second and third Y / C separation parts so as to correspond to the number of video signals inputted.

The phase modulating signal generating means receives first and second luminance signals corresponding to the first and second video signals from the Y / C separating means and converts the first and second analog / digital signals into digital signals. D) first and second first-in first-out (FIFO) memories for receiving an output signal of the first and second analog / digital converters and sequentially outputting the first and second analog / digital converters in accordance with a synchronization signal of a third video signal; It is preferable to include a color encoder for outputting a low-frequency chroma signal by simultaneously receiving output signals of two first-in first-out memories and performing spherical amplitude modulation (QAM).

The mixing means may include a first mixer for mixing and outputting a third luminance signal output from the Y / C separation means and a burst signal output from the phase modulation signal generating means, and the phase modulation. And a digital / analog (D / A) converter for converting the chromaticity signal output from the signal generating means into an analog signal, and a second mixer for mixing the output signals of the first mixer and the digital / analog converter and outputting them to the recorder. It is preferable.

According to a second aspect of the present invention for achieving the above object, an output signal from a reproduction system for reproducing a video signal recorded on a tape is input to a first luminance signal and a chromaticity signal corresponding to the first video signal. Y / C separating means for separating, burst phase detecting means for receiving the output signal from the reproducing system and outputting the burst signal, and synchronizing the first luminance signal with the output signal from the reproducing system. Outputting second and third luminance signals corresponding to the second and third image signals by receiving the synchronous separation means for outputting and the chroma signal from the Y / C separation means and the burst signal from the burst phase detection means. The color decoder and the second and third luminance signals outputted from the color decoder are added to the synchronization signal outputted from the synchronization separating means, and the adjustment is performed so that the level is the same as the original luminance signal. And a switching means for receiving the first luminance signal output from the Y / C separation means and the second and third luminance signals output from the level adjustment means and selectively outputting the second and third luminance signals according to an external selection signal. A multi-image signal selective playback apparatus is provided.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a multi-image signal simultaneous recording apparatus and its selective reproduction apparatus according to the present invention will be described in detail.

1 is a block diagram showing the configuration of the present invention.

In the multiple video signal recording apparatus according to the present invention, as shown in (A) of FIG. 1, the first, second, and second video signals are separated into luminance signals (Y) and chroma signals (C). 3, the first and second analog / receivers for receiving the first and second luminance signals Y1 and Y2 of the Y / C separators 111, 112 and 113 and the first and second Y / C separators 111 and 112 into digital signals. First and second first-in, first-out memories 131 and 132 for receiving the output signals of the digital converters 121 and 122 and the output signals of the first and second analog / digital converters 121 and 122 and outputting them in accordance with the synchronization signal of the third video signal; A color encoder 140 and a third Y / C separation unit 113 which are simultaneously inputted by the output signals of the first and second first-in-first-out memories 131 and 132 to perform spherical amplitude modulation (QAM). A first mixer 150 configured to mix and output a third luminance signal Y3 and a burst signal output from the color encoder 140, and the color encoder The tape 140 is obtained by mixing the digital / analog converter 160 for converting the luminance signal Y1 + Y2, which is combined at the 140, into an analog signal, and the output signals of the first mixer 150 and the digital / analog converter 160. And a second mixer 170 which outputs to a recorder 180 for recording in the.

The simultaneous recording operation of the present invention will be described with reference to the above configuration.

First, when different video signals (video 1, video 2, and video 3) are input through three cameras, the first, second, and third Y / C separation units 111, 112, and 113 respectively output luminance signals. Separated by (Y) and chroma signal (C), the chroma signal is discarded and only the luminance signal is output.

The output first and second luminance signals Y1 and Y2 are converted into digital signals by the first and second analog / digital converters 121 and 122, and synchronized with the first and second first-in first-out memories 131 and 132. After being stored as a signal, it is output in accordance with the synchronization signal of the same third video signal. As a result, the synchronization signals of all the luminance signals Y1, Y2, and Y3 coincide.

Thereafter, the color encoder 140 performs a quadrature amplitude modulation (QAM) on the first and second luminance signals Y1 and Y2 output from the first and second first-in first-out memories 131 and 132 using a reference frequency of 3.58 MHz. By combining. In this case, the reference frequency 3.58MHz is output to the first mixer 150 to be used as a reference clock in a regeneration operation, and combined with the third luminance signal Y3 output from the third Y / C separation unit 113. To lose.

The luminance signal summed by the spherical amplitude modulation is converted into an analog signal in the digital / analog converter 160 and used as the chroma signal in the second mixer 170.

As a result, the output signals of the first mixer 150 and the digital-to-analog converter 160 are mixed in the second mixer 170 to form a signal in the same form as an image signal, and the recording system 180 for recording on a tape. It is output and recorded as one video signal in one track.

At this time, the recording method in the recorder 180 is made by a conventional known method.

On the other hand, the multiple video signal selective playback apparatus according to the present invention receives an output signal from the playback system 210 for reproducing the video signal recorded on the tape as shown in FIG. Y / C separation means 220 for separating the third luminance signal Y3 and the chromaticity signal Y1 + Y2 corresponding to and a burst for receiving an output signal from the reproducing system 210 and outputting a burst signal. (burst) phase detection means 230, synchronous separation means 240 for receiving the output signal from the reproduction system 210 and outputting a synchronization signal for the third luminance signal Y3, and the Y / C The first and second luminance signals Y1 and Y corresponding to the first and second image signals are received by receiving the chroma signal Y1 + Y2 from the separation unit 220 and the burst signal from the burst phase detection unit 230. A color decoder 250 that outputs Y2) and first and second luminance signals Y1 and Y2 that are output from the color decoder 250. A level adjusting means 260 which adds a synchronous signal output from the synchronous separating means 240 and adjusts and outputs the same level as the original luminance signal, and is output from the Y / C separating means 220. A switching means 270 that receives the third luminance signal Y3 and the first and second luminance signals Y1 and Y2 output from the level adjusting means 260 and selectively outputs them according to an external selection signal select. It is composed.

The selective playback operation of the present invention will be described with reference to the above configuration.

First, when the video signal recorded on the tape is reproduced and output by the reproduction system 210, the Y / C separation means 220 separates the luminance signal and the chroma signal. In this case, the luminance signal is a third luminance signal Y3 corresponding to a third image signal, and the chroma signal is a sum of the first and second luminance signals Y1 and Y2 corresponding to the first and second image signals (Y1). + Y2).

Thereafter, the color decoder 250 receives the sum (Y1 + Y2) signal of the first and second luminance signals Y1 and Y2, and the carrier frequency (3.58) in which the burst phase detection unit 230 detects the phase of the burst. And separate into first and second luminance signals Y1 and Y2.

Since the separated signal may be different from the original luminance signal in the DC level or the AC level, the third luminance signal Y3 separated from the synchronous separation means 240 while level adjustment is performed by the level adjusting means 260. ), The synchronous signal is summed.

Thereafter, the third luminance signal Y3 output from the Y / C separation means 220 and the first and second luminance signals Y1 and Y2 output from the level adjusting means 260 are transferred to the switching means 270. In this case, one signal is selectively output according to an external selection signal.

The present invention described above is not limited to the above-described embodiment, and various modifications are possible within the scope of the technical idea. For example, by applying the time division modulation (TDM) method, the number of cameras for inputting a video signal can be increased, and two screens can be simultaneously displayed with a sub picture function (PIP) by changing the output method of the switching means 270. You can also output it.

As described above, the multiple video signal simultaneous recording device and the selective playback device of the present invention can simultaneously record video signals input through three cameras on a single tape and selectively reproduce them as necessary, so that they are necessary for recording. The number of tapes can be reduced to reduce the recording cost, and the tape can be easily stored.

In addition, since a single playback device can be used to easily select and play a video signal input from a desired camera during a playback operation, there is no need for exchanging a tape, thereby providing convenience to a user.

Claims (5)

Y / C (Luminance and Chroma) separation means for receiving three different image signals into luminance signal (Y) and chroma signal (C), and first and second luminance signals output from the Y / C separation means. Phase modulated signal generating means for mixing by performing quadrature amplitude modulation (QAM) and mixing, a third luminance signal output from the Y / C separation means and a chroma signal output from the phase modulation signal generating means; And mixing means for inputting and mixing the outputted signals into a recording system for recording them on a tape as one video signal. The method of claim 1, And the Y / C separation unit comprises first, second and third Y / C separation units so as to correspond to the number of input video signals. The method of claim 1, The phase modulation signal generating means receives first and second luminance signals corresponding to the first and second video signals from the Y / C separating means and converts the first and second analog / digital signals into digital signals, respectively. A first and second first-in first-out (FIFO) memory for receiving an output signal of the first and second analog / digital converters, and sequentially outputting the first and second analog / digital converters in accordance with a synchronization signal of a third video signal; And a color encoder for outputting low-frequency chromaticity signals by simultaneously receiving output signals of the electoral memory and performing a quadrature amplitude modulation (QAM). The method of claim 1, The mixing means includes a first mixer for mixing and outputting a third luminance signal output from the Y / C separation means and a burst signal output from the phase modulation signal generating means, and generating the phase modulation signal. And a digital / analog (D / A) converter for converting the chromaticity signal output from the means into an analog signal, and a second mixer for mixing the output signals of the first mixer and the digital / analog converter to output the recorder. Multiple video signal simultaneous recording apparatus. Y / C separation means for receiving an output signal from a reproduction system for reproducing a video signal recorded on a tape, and separating the first luminance signal and a chromaticity signal corresponding to the first video signal, and an output signal from the reproduction system. Burst phase detection means for receiving an input and outputting a burst signal, Synchronous separation means for receiving an output signal from a reproducing system and outputting a synchronization signal for a first luminance signal, and chromaticity from the Y / C separation means. A color decoder for receiving the burst signal from the signal and the burst phase detection means and outputting second and third luminance signals corresponding to the second and third video signals, and a second output from the color decoder. Level adjusting means for adding a synchronous signal output from the synchronous separating means to the luminance signal and performing adjustment so that the level is equal to the original luminance signal, and outputted from the Y / C separating means. Multiple image signals selected playback apparatus receives the second and third luminance signal output from the first luminance signal and the level adjusting means comprises a switching means for selectively outputting in accordance with the external selection signal.