JPH06292138A - Video signal magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide a video signal magnetic recording and reproducing device having an NTSC monitor output terminal in which no visual noise is caused to a non-picture part even when a letter box video image with an auxiliary signal for high picture quality processing added to the non-picture part is displayed on the NTSC monitor. CONSTITUTION:A letter box discrimination circuit 4 discriminates whether a video signal reproduced by a magnetic recording and reproducing section 2 or an inputted video signal is a letter box video signal or not and in the case of the letter box video signal, a non-picture part replacement circuit 3 replaces a video signal of a non-picture part with an achromatic video signal of single gradation and the result is outputted from an NTSC monitor output terminal 6. Moreover, the video signal before the replacement is outputted from a wide monitor output terminal 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal magnetic recording / reproducing apparatus such as a video tape recorder for recording / reproducing letterbox images.

[0002]

2. Description of the Related Art NTSC images have an aspect ratio of 3: 4, but there are two methods for displaying an image that is wider than this on an NTSC monitor: the letterbox method, in which there is no image above and below the image, and the left and right sides of the image. There is a side panel method that eliminates. Figure 3 shows the monitor image when the letterbox image is displayed on the NTSC monitor.

[0003] In the non-image part of the letterbox image, assistance for improving the image quality such as a moving image component (a difference signal for converting an interlaced image to a non-interlaced image) and a high frequency component of the image signal By inserting a signal, a high-quality image compensated by this auxiliary signal can be displayed on a wide monitor. It can also be displayed as a letterbox image on a conventional NTSC monitor.

[0004]

However, when a letterbox image in which an auxiliary signal such as a moving image component or a high frequency component is put in the non-image portion is displayed on a conventional NTSC monitor, the auxiliary signal is not generated in the non-image portion. Due to the effect, the tint, color and tone change finely. The visual noise generated in this non-image area is
It is annoying and discomforting to the person watching the monitor.

In view of the above problems, the present invention has a video signal magnetic field having an output terminal for an NTSC monitor that outputs a video signal in which a no-picture portion has no visual noise even when a letterbox video is displayed on the NTSC monitor. An object is to provide a recording / reproducing device.

[0006]

In order to achieve the above object, the video signal magnetic recording / reproducing apparatus of the present invention produces a letterbox image in which a non-image portion has an auxiliary signal for improving the image quality. It is for recording and playback, and has an output terminal to a wide monitor and an output terminal to an NTSC monitor,
From the output terminal to the TSC monitor, the auxiliary signal of the non-image part is replaced with another video signal such as a colorless image having a single gradation and is output.

[0007]

According to the present invention, the NTSC monitor outputs the auxiliary signal of the non-image part by replacing it with another video signal such as a colorless image having a single gradation from the output terminal to the NTSC monitor. Even when displayed as a letterbox image on the monitor, no unpleasant visual noise appears in the non-image area.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a video signal magnetic recording / reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, a non-image portion contains an auxiliary signal for improving image quality such as a moving image component (a difference signal for converting an interlaced image to a non-interlaced image) or a high frequency component of a video signal. Letterbox video signal 11
Is input from the input terminal 1. Input video signal 11
Is a magnetic head (not shown) in the magnetic recording / reproducing unit 2.
Is recorded on a magnetic recording medium (not shown) via the. The letterbox video signal 21 reproduced from the magnetic recording medium during reproduction and the letterbox video signal 11 input from the input terminal 1 during non-reproduction are input to the non-image portion replacement circuit 3. Further, the letterbox video signal 31 input to the non-image portion replacement circuit 3 is simultaneously output from the wide monitor output terminal 5. The non-image part replacement circuit 3 replaces the image signal of the non-image part with another image such as a colorless image signal with a single gradation.

Details of the non-image portion replacement circuit 3 will be described with reference to FIG. The input video signal 31 to the non-image area replacement circuit 3 is input to the switching circuit 7 and the horizontal position determination circuit 8. The horizontal position determination circuit 8 detects the vertical / horizontal synchronizing signals in the video signal to determine the video horizontal position, and outputs the video horizontal number signal 81 to the non-image area detection circuit 9 and the memory circuit 10. The memory circuit 10 stores a video signal to be replaced (for example, a colorless image with a single gradation, an image of a single color, a character image, etc.), and the replacement is performed at the corresponding horizontal position from the video horizontal number signal 81. The video signal 101 is output to the switching circuit 7.

The non-picture portion detection circuit 9 detects the non-picture portion from the picture horizontal number signal 81 and outputs it as a control signal 91 for the switching circuit 7. In the switching circuit 7, when the control signal 91 indicates the non-image area, the memory circuit 1
When the video signal 101 from 0 is not the non-image portion, the input video signal 31 to the non-image portion switching circuit 3 is output as the output signal 32 of the non-image portion switching circuit 3. FIG. 4 shows the video signal 31 before replacement and FIG. 5 shows the video signal 32 after replacement.

The replaced letterbox signal 32 is output from the NTSC monitor output terminal 6. Also,
A letterbox identification signal is added to the letterbox image signal, and when the letterbox identification circuit 4 identifies that an NTSC image different from the letterbox is input, the image signal before replacement of the non-image area 31 Is NT
Switching is performed by sending a control signal to the switching circuit 33 so that it is output to the SC monitor output terminal.

[0013]

As described above, according to the present invention, the signal of the non-picture part of the letterbox image is replaced and output, so that the letterbox image is generated from the conventional NTSC.
Even when displayed on a monitor, there is no visual noise in the non-image area, and the viewer does not feel uncomfortable or tired.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a video signal magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a non-image portion replacement circuit according to the present embodiment.

FIG. 3 is a schematic diagram showing a monitor screen when a letterbox image is displayed on a conventional NTSC monitor.

FIG. 4 is a schematic diagram showing a waveform of a video signal in a video portion period and a non-image portion period of a letterbox image.

FIG. 5 is a schematic diagram showing a waveform of a video signal after replacing the video signal of a non-picture part.

[Explanation of symbols]

 1 Input Terminal 2 Magnetic Recording / Reproducing Section 3 Non-Image Area Replacement Circuit 4 Letter Box Identification Circuit 5 Wide Monitor Output Terminal 6 NTSC Monitor Output Terminal

Claims (4)

[Claims] 1. A video signal magnetic recording system for recording and reproducing a letterbox video comprising an NTSC video signal in a video portion, and non-picture portions located above and below the video portion in which an auxiliary signal for improving the image quality of the video is recorded and reproduced. A playback device that has an output terminal to a wide monitor and an output terminal to an NTSC monitor, and when a letterbox video signal is input, the auxiliary signal of the non-image part is separated from the output terminal to the NTSC monitor. A video signal magnetic recording / reproducing apparatus characterized in that it outputs a video signal which is replaced with the above signal. 2. The video signal magnetic recording / reproducing apparatus according to claim 1, wherein the video signal to be replaced with the auxiliary signal of the non-picture portion shows a colorless image with a single gradation. 3. The video signal magnetic recording / reproducing apparatus according to claim 1, wherein the video signal to be replaced with the auxiliary signal of the non-picture portion represents a single color image. 4. The video signal magnetic recording / reproducing apparatus according to claim 1, wherein the video signal replaced with the auxiliary signal of the non-picture portion represents a character image.