CN1984269A - Video device and method for automatically compensating weak signal - Google Patents

Abstract

An apparatus and method for automatically compensating for a weak signal includes a tuner, a video decoder, and a controller. The tuner receives the analog signal and outputs a video signal according to the analog signal, and generates a gain control signal according to the strength of the analog signal. The video decoder decodes the video signal into a digital signal. The controller receives the digital signal and the gain control signal and outputs a picture according to the digital signal. When the controller judges the strength of the analog signal to be weak according to the gain control signal, the video decoder is enabled to start the noise reduction function to generate the digital signal. The controller displays a message on the screen according to the gain control signal, representing the strength of the analog signal, so as to provide a basis for troubleshooting for a user.

Description

Video device and method for automatically compensating weak signal

technical field

The present invention relates to a video device, and in particular to a video device and method for automatically compensating weak signals.

Background technique

In traditional analog TV, the picture is displayed by the tuner inside the TV, the antenna receives the radio wave, converts it into a video signal and transmits it to the TV controller for signal processing, and then generates an image. When the external environment changes and the radio signal becomes weaker, the corresponding video signal strength also becomes weaker, accompanied by noise. Therefore, the traditional improvement method is to judge the strength of the signal visually by the user, and manually activate the noise reduction function provided by the control interface to improve the picture quality.

However, judging the signal strength by visual inspection is not accurate. Moreover, in some TVs, in order to reduce noise, the user often has to open the function screen through the control interface, browse the function options to find the noise reduction function, and click After that, it can be started, causing inconvenience in use.

Contents of the invention

In view of this, the object of the present invention is to provide a method for automatically compensating weak signals.

According to the purpose of the present invention, a device for automatically compensating weak signals is proposed. The video device includes a tuner, a video decoder and a controller. The tuner receives the analog signal and outputs a video signal accordingly, and generates a gain control signal according to the strength of the analog signal. A video decoder decodes video signals into digital signals. The controller receives digital signals and gain control signals, and outputs images according to the digital signals. When the controller judges that the strength of the analog signal is weak according to the gain control signal, it makes the video decoder activate the noise reduction function to generate a digital signal.

According to the object of the present invention, a method for automatic compensation of weak signals is proposed. First, the tuner receives an analog signal and outputs a video signal and a gain control signal. Next, the video signal is decoded into a digital signal by a video decoder. Then, the controller is used to output images according to the digital signal. The controller determines whether to activate the noise reduction function of the video decoder to generate digital signals according to the gain control signal.

In order to make the above-mentioned purpose, features, and advantages of the present invention more comprehensible, a preferred embodiment will be described in detail below together with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a video device for automatically compensating weak signals according to a preferred embodiment of the present invention.

FIG. 2 is a diagram of a video device for automatically compensating weak signals according to another preferred embodiment of the present invention.

FIG. 3 is an enlarged view of the screen 240 in FIG. 2 .

FIG. 4 is a flowchart of a method for automatically compensating weak signals according to a preferred embodiment of the present invention.

FIG. 5 is a table showing the relationship between the voltage value of the gain control signal AGC and the analog signal AS.

[Description of main component labels]

100, 210: Video devices that automatically compensate for weak signals

110, 210: Tuner

120, 220: video decoder

130, 230: controller

140, 240: screen

132, 250: scaler

260: control interface

270: remote control

Detailed ways

Please refer to FIG. 1 , which shows a video device for automatically compensating weak signals according to a preferred embodiment of the present invention. The video device 100 includes a tuner 110 , a video decoder 120 , a controller 130 and a screen 140 . The controller 130 also includes a scaler 132, for example. The tuner 110 is used to receive the analog signal AS and output the video signal VS accordingly, such as a composite TV broadcast signal CVBS (Composite Video Broadcast Signal) signal format, and generate a gain control signal AGC (Auto Gain Control) according to the strength of the analog signal AS . The video decoder 120 receives the video signal VS output by the tuner 110 and converts it into a digital signal DS, such as an ITU-656 signal format. The controller 130 receives the gain control signal AGC, and outputs a control signal CS to control the video decoder 120 accordingly. The controller 130 also receives the digital signal DS and outputs the picture Im accordingly, for example in R/G/B format. The scaler 132 adjusts the resolution of the digital signal DS, for example, converts the signal with a resolution of 640×480 to 800×600, and displays it on the screen 140 .

Please refer to FIG. 5 , which shows the relationship between the voltage value of the gain control signal AGC and the analog signal AS. When the signal strength of the analog signal AS is higher, the voltage value of the gain control signal AGC generated by the tuner 110 is smaller; relatively, when the signal strength of the analog signal AS is weaker, the gain control signal generated by the tuner 110 The voltage value of AGC is larger.

Through the voltage of the AGC signal, the controller 130 can determine the signal strength of the analog signal AS at this time, and then output the control signal CS to determine whether the video decoder 120 activates the noise reduction function. When the signal strength of the analog signal AS is very weak, such as 60 dBuV, the tuner 110 outputs a larger gain control signal AGC voltage (4.14V). Therefore, the controller 130 enables the video decoder 120 to activate the noise reduction function to generate the digital signal DS with lower noise. In addition, the controller 130 can enable the video decoder 120 to activate the noise reduction function to different degrees according to the magnitude of the gain control signal AGC. For example, in FIG. 5, when the AGC voltage value is 1.89V, the video decoder 120 starts the first-stage noise reduction function; and when the AGC voltage value rises to 4.14, then starts the second-stage noise reduction function, To implement larger signal compensation.

Please refer to FIG. 2 , which is a diagram of a video device for automatically compensating weak signals according to another preferred embodiment of the present invention. The video device 200 includes a tuner 210 , a video decoder 220 , a controller 230 , a screen 240 , a scaler 250 , a control interface 260 and a remote controller 270 . In this embodiment, the controller 230 and the scaler 250 are, for example, chips independently installed on a mainboard (not shown) of the video device 200 . The scaler 250 receives the digital signal DS and outputs the frame Im accordingly. The controller 230 receives the gain control signal AGC to determine the strength of the analog signal AS, and accordingly outputs the control signal CS to activate the noise reduction function of the video decoder 220 . The control interface 260 is used for the user to operate the video device 200 by touch or remote control. In this example, the video device 200 is operated by the remote control 270 . When the signal status function of the video device 200 is activated by the user through the remote controller 270, the controller 230 displays a message on the screen 240 to inform the user of the current signal strength according to the gain control signal AGC.

Please refer to FIG. 3 , which is a schematic diagram of display content of the screen 240 in FIG. 2 . When the user activates the signal status function through the remote controller 270 , the screen 240 will display a message representing the strength of the analog signal AS, such as "signal weak", so as to provide the user with a basis for troubleshooting. When the user thinks that there is too much noise on the screen, the signal status function can be activated to know whether the noise is caused by a weak signal, or there are other reasons such as poor contact of the wire end.

Please refer to FIG. 4 , which shows a flowchart of a method for automatically compensating weak signals according to a preferred embodiment of the present invention. First, in step 410, the tuner 110 is used to receive the analog signal AS, and output the video signal VS and the gain control signal AGC. Next, step 420 is executed to determine whether the analog signal is a weak signal. If the analog signal AS is not a weak signal, execute step 430 to decode the video signal VS into a digital signal DS by using the video decoder 120 . Then, in step 440, the controller outputs the image Im according to the digital signal DS. If in step 420 , the controller 130 determines that the analog signal AS is a weak signal through the voltage of the gain control signal AGC, then before step 440 , step 450 is executed to activate the noise reduction function of the video decoder.

In order to provide the user with information about the analog signal AS, the method may also include an additional step of determining whether the signal status function is activated by the user. If so, display a corresponding message on the screen according to the gain control signal to inform the user of the strength of the analog signal.

In view of this, the video device and method for automatically compensating for weak signals disclosed in the above-mentioned embodiments of the present invention can determine whether the video signal AS is a weak signal through the gain control signal AGC, and then automatically perform signal compensation to effectively improve weak signals. The noise on the screen during the signal is automatically compensated, which improves the convenience of use. In addition, the user can activate the signal status function through the control interface, and obtain information about the signal status, so as to serve as a basis for troubleshooting.

In summary, although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make various modifications without departing from the spirit and scope of the present invention. Changes and modifications, so the protection scope of the present invention should be defined by the scope of the appended claims.

Claims (9)

1. video-unit that automatically reduces weak signal comprises:

Tuner is used to receive analog signal and outputting video signal according to this, and produces gain control signal according to the intensity of this analog signal;

Controller receives this gain control signal judging the intensity of this analog signal, and produces control signal; And

Video Decoder receives this vision signal and this control signal, and it is decoded as digital signal.

2. device according to claim 1 wherein when this controller judges that the intensity of this analog signal is weak, is then exported this control signal and is made this Video Decoder start noise reduction function to produce this digital signal.

3. device according to claim 2, wherein, this controller comprises scaler, is used to adjust the resolution of this digital signal.

4. device according to claim 1 also comprises screen, according to this digital signal display frame.

5. device according to claim 4, wherein, display message is in this screen according to this gain control signal for this controller, and this message is to represent the intensity of this analog signal.

6. device according to claim 5, wherein, this message is to do the foundation that fault is got rid of for the user.

7. the method for an automatically compensating weak signal is used for video-unit, and this video-unit comprises tuner, Video Decoder and controller, and this method comprises:

(a) utilize this tuner to receive analog signal and outputting video signal and gain control signal, wherein this gain control signal is the intensity of this analog signal of expression;

(b) utilize this controller to receive the intensity that this gain control signal is also judged this analog signal according to this, and produce control signal; And

(c) utilize this vision signal of this video decoder decodes and receive this control signal and produce digital signal according to this.

8. method according to claim 7, wherein, this video-unit comprises screen, this method also comprises:

Display message is in this screen according to gain control signal, and this message is to represent the power of this analog signal.

9. method according to claim 7, wherein, this controller is whether to start the noise reduction function of this Video Decoder to produce this digital signal according to this control signal decision.

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