KR970009070B1 - Video cassette recorder with color killer function - Google Patents

Abstract

A video cassette recorder having color killer function includes a system controller 180 for selectively outputting a color killer signal under the control of a user and generating an EE signal indicating the EE mode of the video cassette recorder, a playback signal processor 130 for restoring a video signal read from a video tape to generate a playback luminance signal and playback color signal, a color trap 50 for removing the color signal from the video signal of the signal processor 50, a first color killer unit 110 for selectively outputting the playback color signal according to the color killer signal, an Y/C mixer 70 for selectively mixing the signals of the first color killer unit 110 and color trap 50, a recorder 140 for generating a record luminance signal and record color signal, a record color signal processor 150 for recording the record color signal, a second color killer unit 160 for removing the color signal of the record color signal processor 150 according to the color killer signal, and a record color signal processor 170 for processing the signal of the second color killer unit 160.

Description

Video cassette recorder with color killer function

1 is a system configuration diagram of a video cassette recorder having a color killer function according to the present invention.

2 is a detailed circuit diagram showing a color killer circuit.

* Explanation of symbols for main parts of the drawings

10: automatic gain control unit 20: clamp

30: switching unit 40: signal processing unit

50: color trap part 70: Y / C mixer part

90: inverter 100: AND gate

110,160: color killer 130: reproduction signal processing unit

140: recorder 150,170: recording color signal processing unit

180: system control unit 190: color killer key

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double deck cassette recorder (hereinafter referred to as a VCR) with a built-in color killer function. In particular, a color video signal is recorded as a black and white video signal using a color killer device. A VCR has a color killer function that can be reproduced.

A conventional VCR for reproducing or recording a color video signal is configured to output only a color video signal. Therefore, when a user wants to watch a color video signal reproduced or recorded on a VCR through a monitor, the user has no choice but to view a color video screen. Also, when a viewer watches a color video as a black and white video, it is possible only through a black and white TV. did. Therefore, when a user records or reproduces a color image in black and white as necessary, the user cannot record or reproduce a black and white image without using a separate device. In addition, a separate device was required to record or reproduce any specific screen desired by the user in the color image screen.

Accordingly, an object of the present invention is to provide a VCR having a color killer function capable of reproducing or recording a color image screen as a black and white image according to a user's need by configuring a color killer circuit in a conventional VCR.

In order to achieve the above object, the present invention provides a video cassette recorder capable of reproducing and recording a video signal on a video tape. The present invention is capable of selectively outputting a color killer signal according to a user's control. A system controller for outputting an EE signal informing that the EE mode is in the EE mode; A reproduction signal processing unit for reproducing the image signal read out from the video tape and outputting the reproduction signal as a reproduction luminance signal and a reproduction color signal respectively; A switching unit for selecting and outputting a reproduction signal processor and an external video signal; A signal processing unit for processing and outputting an output of the switching unit; An inverter for inverting the EE signal of the system controller; An AND gate for combining and outputting an inverter and the color killer signal; A color trap unit which removes and outputs a color signal from an image signal of the signal processor in accordance with the output of the end get; A color trap unit for selectively outputting a reproduced color signal of the reproduced signal processing unit according to the color killer signal; A Y / C mixer unit for selectively mixing and outputting signals of the first color trap unit; A recording system for recording and outputting the output of the switching unit as a recording luminance signal and a recording color signal; A recording color signal processing unit for recording and outputting a recording color signal of the recording system; A second color killer section for canceling the color signal of the recording color signal processing section in accordance with the color signal; And a recording color signal processing unit which processes and outputs a signal of the second color killer unit.

The present invention configures a color killer device in a VCR that reproduces or records a conventional color image signal, so that the image signal can be reproduced or recorded as a color image or a black and white image according to a user's needs.

Therefore, when the user edits or plays back the VCR, not only the effect of recalling the past but also the improved aesthetic image can be viewed.

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

1 is a system configuration diagram of a VCR having a color killer function according to the present invention, and includes an auto gain control unit 10 for automatically controlling gain of an externally input video signal (for example, a TV video signal). ), A clamp 20 for fixing the input video signal to the sync tip level, a switching unit 30 for selecting an external input video or a playback video of a video tape, and a video signal selected from the switching unit 30. A signal processing unit 40 for processing, a color trap unit 50 for controlling an input video signal as a black and white video signal as required, a Y / C mixer unit 70 for mixing a color signal and a luminance signal, and a video signal An output driver 80 for outputting the signal to the outside, color killer units 110 and 160 for controlling the video signal as a black and white video signal, and a playback signal for receiving a video signal from a video tape and processing the video signal into a reproduction color signal and a reproduction luminance signal, respectively. Processing 130, a recording system 140 for processing the luminance signal and the color signal of the video signal to be recorded, recording color signal processing units 150 and 170 for processing the color signal to be recorded, and color killer operation according to the user's needs And a system control unit 180 that controls the color killer signal and the EE (electronical to electronical) signal according to the color killer key 190 and the color killer input signal from the color killer key 190.

The present invention is a device for converting a color image into a black and white image according to the color killer control signal of the system controller 180 by using the color killer function built in the VCR. The operation is as follows. First, the automatic gain controller 10 gains a constant image signal from the outside through the automatic gain controller 10, and the clamp 20 outputs a constant sync tip (the image signal input from the automatic gain controller 10). syncs level) to the switching unit 30. The switching unit 30 selects an image signal output from the clamp 20 when recording an image signal received from an external device, for example, a tuner, and reproduces the image signal of the video cassette. In this case, the reproduction luminance signal output from the reproduction signal processor 130 is selected and applied to the signal processor 40.

The signal processor 40 applies a video signal to the color trap unit 50 by removing leakage color components (signals included in the reproduced luminance signal) or noise among the signals output from the switching unit 30. The color trap unit 50 controls the color image signal output from the signal processing unit 40 in color or black and white according to the signal output through the AND gate 100, and the signal output from the AND gate 100 is high. If high, the color trap unit 50 removes the color signal from the image signal output from the signal processor 40 and outputs the black and white image. However, if the signal output from the AND gate 100 is low, the color trap unit 50 50 outputs an image signal (which is a color image signal) output from the signal processing unit 40.

In the above operation, the color trap unit 50 operates only at the time of EE or recording. Meanwhile, the color trap unit 50 applies the color image or the monochrome image signal selected according to the control signal of the AND gate 100 to the Y / C mixer unit 70. The control signal of the AND gate 100 is determined according to the color killer signal output through the system controller 180 and the EE (L) signal inverted through the inverter 90. The control signal of the AND gate 100 is output according to the control of the system controller 180. The EE (eiectronical to electronical) (L) signal outputs a low signal when recording an image signal input from an external device, for example, a tuner, but high when a video cassette is played back. high) outputs a signal.

On the other hand, the system controller 180 outputs a color killer signal (high signal) when the caliper killer key 190 is input, and otherwise outputs a low signal. Thus, for example, when the Kali Killer key 190 is input from the outside to convert the video signal received through the tuner to the monochrome image, the system controller 180 EE signal is input. (Low signal L) is inverted through the inverter 900 and then applied to the AND gate 100 and a color killer signal (high signal) is applied to the AND gate 100 at the same time.

In addition, when the kali killer key 190 is input from the outside, the system controller 180 applies the color killer signal (high signal) to the first color killer unit 110 and the second color killer unit 160. As described above, the color trap unit 50 converts an image signal input from the outside, for example, a tuner image signal into a color image or a monochrome image signal according to a control signal of the AND gate 100. On the other hand, an image signal input from the outside, for example, the image signal received through the tuner is converted into a color image or a black and white image in the color trap unit 50, and then applied to the Y / C mixer 70. Meanwhile, the color image or the black and white image signal applied to the Y / C mixer unit 70 is outputted to the monitor through the output driver 80.

The output of the switching unit 30 is input to the recorder 140 so that recording can be performed at the same time. The reproduction signal processor 130 receives a reproduction video signal from a video tape, processes the reproduction signal into a reproduction luminance signal and a reproduction color signal, and applies the reproduction signal to the switching unit 30 and the first color killer unit 110, respectively. The first color killer unit 110 converts the playback color signal of the videotape output from the playback signal processing unit 130 into a black and white signal according to the color killer signal output from the system controller 180. If the color killer signal of the (high signal) does not apply the reproduced color signal output from the reproduction signal processing unit 130 to the Y / C mixer unit 70, but if the color killer signal of the system control unit 180 does not operate (Low signal) The reproduction color signal output from the reproduction signal processing unit 130 is directly applied to the Y / C mixer unit 70.

On the other hand, when reproducing the video tape, the switching unit 30 selects the reproduction luminance signal output from the reproduction signal processing unit 130, and the reproduction luminance signal is the signal processing unit 40 and the color trap unit in the signal flow as described above. It is applied to the Y / C mixer section 70 via 50. The Y / C mixer 70, which receives the reproduction brightness signal of the video tape from the color trap unit 50, mixes with the reproduction color signal output from the first color killer unit 110, and thus the image of the mixed video tape. The signal (which is a color image signal) is applied to the output driver 80 so that a user can watch through the monitor. Then, the output driver 80 drives the image signal of the input video tape to display on the monitor. On the other hand, when recording the video signal of the video tape in black and white, the user presses an externally mounted kali killer key 190.

Then, the system controller 180 transmits the color killer signal (high signal) to the second color killer 160. At the same time, the external input image signal output through the switching unit 30 is applied to the recorder 140. On the other hand, the recorder 140 receives an external input image signal from the switching unit 30 and performs a signal processing to enable recording, and outputs a recording luminance signal, and simultaneously outputs a recording color signal to the recording color signal processing unit 1 150. Enter it. The recording color signal inputs the recording color signal to the recording color signal processor 1 (150).

The recording color signal is signal-processed to be recorded by the recording color signal processing unit 1 150 and input to the second color killer unit 160. The second color killer unit 160 receives a color killer signal (high signal: H) from the system control unit 180, removes the recording color signal output from the recording color signal processing unit 1 150, and records the recording color signal processing unit 2. An image is recorded in black and white through 170. However, when the video signal of the videotape is reproduced in black and white, as described above, when the user presses the externally mounted kali killer key 190, the system controller 180 transmits the color killer signal (high signal) to the first color killer unit ( 110). Then, the first color killer unit 110 receiving the reproduction color signal of the video tape output from the reproduction signal processing unit 130 applies the reproduction color signal to the Y / C mixer unit 70 by removing the reproduction color signal. I never do that. When the video signal of the videotape is reproduced in black and white, the Y / C mixer unit 70 outputs the reproduction luminance signal output from the color trap unit 50 through the output driver 80 with the signal flow as described above. . 2 illustrates an embodiment of the above-described color killer unit 110 and 160.

As shown in the drawing, the color killer unit 110 and 160 includes a filter capacitor C1 and a switching transistor Q at an input terminal of an image signal, and the switching transistor Q is configured to drive by a color killer signal. have. At this time, the filter capacitor C1 should be configured to filter only the color signal from the image signal. On the other hand, in the color killer, the color killer can be performed by removing only the color burst.

As described above, the present invention includes a color killer circuit in a conventional VCR to record or reproduce not only a color image but also a black and white image, thereby realizing an aesthetic image as well as an effect of recalling the past.

Claims (1)

In a video cassette recorder capable of reproducing and recording an image signal on a video tape, a color killer signal can be selectively output according to a user's control, and an EE indicating an EE mode in the EE mode of the video cassette recorder. A system controller 180 for outputting a signal; A reproduction signal processing unit 130 for reproducing the image signal read out from the video tape and outputting the reproduction signal as a reproduction luminance signal and a reproduction color signal; A switching unit 30 for selecting and outputting the reproduction signal processor 130 and an external image signal; A signal processor 40 for processing and outputting the output of the switching unit 30; An inverter 90 inverting and outputting the EE signal of the system controller 180; An AND gate (100) for combining and outputting the inverter (90) and the color killer signal; A color trap unit 50 for removing and outputting a color signal from an image signal of the signal processor 50 according to the output of the AND gate 100; A first color killer unit 110 for selectively outputting the reproduced color signal of the reproduced signal processor 130 according to the color killer signal; A Y / C mixer unit 70 for selectively mixing and outputting signals of the first color killer unit 110 and the color trap unit 50; A recorder (140) for recording and outputting the output of the switching unit (30) as a recording luminance signal and a recording color signal; A recording color signal processing unit 150 for recording and outputting a recording color signal of the recording system 140; A second color killer unit 160 for canceling the color signal of the recording color signal processing unit 150 according to the color killer signal; And a recording color signal processor (170) for processing and outputting the signal of the second color killer (160).