JPH0830219A - Karaoke device - Google Patents

Abstract

PURPOSE:To prevent display deterioration due to burning of a CRT of a monitor TV from occurring in a stand-by state by providing a circuit lowering a luminance level in a video signal reproducing device. CONSTITUTION:A system controller 5 detects whether or not an audio/video reproducing device 1 is in a pause state, and it time counts whether or not a prescribed time T lapses, and when the prescribed time (t) within the time T lapses, it changes ratios of RGB in a chrominance signal level in a gain control circuit 3, and it outputs a signal changing a color of a video displayed on a display. When the prescribed time, e.g. T=ten minutes lapses, it lowers the luminance signal level in the gain control circuit 3 by a half 6dB. Further after the prescribed time lapses, e. g. t'=five minutes lapses, it sends an image signal to a video signal processing circuit 2 instead of the background image of the system controller 5, and it outputs the signal leveled down by the gain control circuit 3, and it detects whether or not the device is in the pause state, and it repeats that.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a karaoke device for reproducing a video signal.

[0002]

2. Description of the Related Art A conventional karaoke apparatus for reproducing a video signal includes a sync signal, a color signal representing chromaticity (chromaticity signal, carrier color signal), and a brightness signal representing brightness as video signals on a monitor television. It is outputting. The levels of the color signal and the luminance signal are usually fixed, and in some cases, the color signal and the luminance signal can be adjusted only manually.

[0003]

However, according to the above-mentioned prior art, the monitor television is used when a signal having a high luminance signal level is continuously displayed on the monitor television or when a still image state is maintained for a long time. There was a problem that a certain part of CRT caused a CRT burn.

[0004]

Therefore, according to the present invention, a circuit for changing the level of a video signal by a system controller (microcomputer) according to the situation is provided in the video signal reproducing apparatus, so that the level of the luminance signal is normally set. This is made lower than that in the reproduction state, thereby preventing deterioration due to burning of the display screen such as a cathode ray tube of a monitor TV. Further, when standing by in a paused state, the color is changed at every elapse of a predetermined time, and the time elapse is indicated by a sequential color change display.

[0005]

Therefore, by providing a circuit for lowering the luminance signal level in the video signal reproducing apparatus, the luminance signal level and the colors are changed in the order of green, yellow, and red to notify the singer to encourage singing. , It is possible to prevent the display deterioration due to the burning of the picture tube of the monitor TV in the standby state.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG.
FIG. 1 is a block diagram showing an embodiment of a video signal reproducing device according to the present invention. Audio / video playback device (karaoke device)
The signal reproduced in 1 is divided into an audio signal and a video signal, and the video signal is processed by the video signal processing circuit 2. On the other hand, the audio signal is output from the speaker 7 via the audio amplifier 6.
At this time, the video signal enters from the video processing circuit 2 to the gain control circuit 3 and is output to the video output terminal 4 at a predetermined luminance signal level without changing the gain during normal reproduction.

When the video is played back, the system controller 5 controls the audio / video playback device 1 and, at the same time, outputs a control signal to the gain control circuit 3. The control signal is an audio / video signal reproducing device 1.
Is output according to the playback state of, and the playback device is in a pause (pause) state or a still image state, or for a certain period of time, for example, 10
After a lapse of minutes, a control signal is sent to the gain control circuit 3 to reduce the brightness level of the video signal.

FIG. 2 shows a flow chart of control by the system controller 5 of the karaoke apparatus of the present invention. The power of the audio / video signal reproducing apparatus 1 is turned on and audio / video is reproduced (S1). When the reproduction state ends, the system controller 5 issues a temporary stop command and the audio / video reproduction device 1
Is in a pose.

The system controller 5 detects whether the audio / video reproducing apparatus 1 is in a pause state (S2), counts whether or not a preset predetermined time T has elapsed (S3), and determines within a predetermined time T. After the lapse of time t, for example, after one minute has passed, a signal for changing the RGB ratio of the color signal level of the gain control circuit 3 to change the color of the image displayed on the display is output (S5). When a predetermined time, for example, T = 10 minutes has elapsed in (S3), the luminance signal level of the gain control circuit 3 is reduced by 6 dB by half (S6).

After a lapse of a predetermined time, for example, t '= 5 minutes
(S7), the image signal is converted to the background image stored in the system controller 5, the image signal is sent to the video signal processing circuit 2, and the signal already leveled down by the gain control circuit 3 is output (S8). , (S2) is detected and repeated. When the audio / video reproducing apparatus 1 changes from the pause state (S2) to the reproducing state, the system controller 5 returns the control level of the gain control circuit 3 to the original level (S9), and the reproducing operation (S1).
Return to.

When the luminance signal level is lowered (S6), the level is lowered to such an extent as to prevent CRT burning, and the level is set so that the control cannot be lowered below that level.

When the audio / video reproducing apparatus 1 for karaoke or the like is in a paused state, the color of the reproduced video is changed so that a specific location becomes a white level luminance signal level at a certain level and the screen display is burned to display a screen. Since there is no fear of deterioration, the luminance signal level can be set high during normal video reproduction. Further, when the audio / video reproducing apparatus 1 is in the paused state, the screen is displayed in different colors and changes in color every predetermined time, so that the elapsed time when selecting a karaoke song can be understood from the color of the screen, and encourages the singer to sing. Can be.

[0013]

As described above, according to the video signal reproducing apparatus of the present invention, the circuit for decreasing the luminance signal level according to the situation can prevent the cathode-ray tube from burning on the monitor TV and sing a song to the karaoke singer. Can guide the candle.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment according to the present invention.

FIG. 2 is a flowchart showing the operation of the karaoke apparatus of the present invention.

[Explanation of symbols]

 1 audio / video reproduction device (karaoke device) 2 video signal processing circuit 3 gain control circuit 4 video output terminal 5 system controller 6 audio amplification circuit 7 speaker

Claims (3)

[Claims] 1. A karaoke device for reproducing a video signal, comprising a luminance signal level control circuit for controlling a gain of an output video signal after a predetermined time elapses after the power of the device is turned on and the video signal is reproduced to enter a pause mode. A karaoke device that is controlled by a system controller (microcomputer) to change the level of video signals. 2. The karaoke apparatus according to claim 1, wherein the color of the video signal output is sequentially changed at predetermined time intervals when the mode is changed to the pause mode so that the color of the screen is sequentially changed. 3. The karaoke apparatus according to claim 1, wherein a still image stored in a storage device in advance is output to change the color.