CN1700749A - Intelligent identification method of TV signal intensity - Google Patents

Abstract

The invention discloses an intelligent identification method of signal strength in a television set, which utilizes an internal chip of the television set to detect the signal-to-noise ratio of the demodulated television signal, and divides the detected signal-to-noise ratio into eight according to the sequence from low to high. Each level corresponds to a different level of antenna strength icons in the OSD, similar to the antenna strength icons we see in mobile phones. When users watch TV programs, they can accurately see the strength of TV broadcast signals anytime and anywhere. When the signal strength is changing, the indication of the signal strength will also be displayed and changed, indicating that the signal is unstable at this time and reminding the user to pay attention. The signal strength intelligent identification method of the present invention provides a tool for users to identify signal strength conveniently and intuitively. In the case of not increasing the cost, the additional functions of the TV are increased, which brings greater added value to consumers.

Description

Intelligent Identification Method of Signal Strength in TV

technical field

The invention belongs to the field of TV manufacturing, and relates to a technology for realizing additional functions of the TV, in particular to a method for adding a signal strength indicator on the TV to facilitate users to intuitively understand the strength and weakness of the TV broadcast signal.

Background technique

After years of development, TV technology has become a very mature product at this stage, and the competition in the market is becoming more and more cruel. In order to make the product widely recognized by consumers among the many competitors in the market, it is necessary to segment the market. Realize product differentiation competition. The differentiation of special functions requires the addition of additional TV functions at a lower cost to meet the growing diversified needs of consumers and enhance the market competitiveness of products. As we all know, the indication of signal strength in mobile phones has become one of the necessary display symbols in mobile phones. With the rapid development of TV, consumers' demand for TV is not limited to watching TV programs. On-screen display OSD There are more and more requirements for the diversification of aesthetics and functions. If it is possible to add an indication function of signal strength to existing televisions without increasing costs, this will undoubtedly attract consumers' attention, bring greater added value to consumers, and then enhance the competitiveness of television products.

Contents of the invention

In order to solve the problem in the prior art that the television cannot display the strength of the signal, so that the user cannot intuitively see whether the signal is good or bad, and make a correct judgment, the present invention provides an intelligent identification method for signal strength, which is given A quantitative standard for the strength of the signal has been added, and additional functions of the TV have been added.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions to achieve:

A method for intelligent identification of signal strength in a television set, comprising the following steps:

Step 1, demodulating the input signal to obtain a demodulated TV signal;

Step 2. After the demodulated TV signal is processed by the internal circuit of the TV, the value of the signal-to-noise ratio is obtained and stored in the register; the value read from this register is divided into eight levels from 0 to 7, corresponding to the value of the signal-to-noise ratio For: SNR≤18dB, 18dB<SNR≤25dB, 25dB<SNR≤28dB, 28dB<SNR≤31dB, 31dB<SNR≤37dB, 37dB<SNR≤40dB, 40dB< SNR≤43dB, SNR>43dB;

Step 3. Determine whether a display command is received from the user or the detected signal-to-noise ratio level has changed. If there is a request for a display command or a change in the signal-to-noise ratio level, enter the next step of display processing, otherwise continue to read register, waiting for the next display command;

Step 4: Display the corresponding antenna strength icon according to the SNR level.

As a further limitation to the above technical solution, in the demodulated TV signal, the luminance signal enters the DC clamping circuit for processing after the DC component is filtered by a capacitor, and its output terminal is strobed with one of the system selection switches. The other gate of the system selection switch is connected to the video signal, and its output is respectively connected to the sync separator and the noise detection circuit, and the noise detection circuit inputs the detected signal-to-noise ratio into the register .

As a further limitation to the above technical solution, the method for displaying the antenna strength icon includes the following steps:

Step 1, read out the value of the signal-to-noise ratio in the register;

Step 2. Select the corresponding character combination according to the level of signal-to-noise ratio; wherein, each character corresponds to an icon state, and the combination represents the current signal strength;

Step 3, the character is downloaded and the corresponding antenna strength icon is displayed.

As a further limitation to the above technical solution, 9 characters are used to represent 9 icon states, and antenna strength icons of any level are represented by a combination of 3 characters.

Compared with the prior art, the advantages and positive effects of the present invention are: the present invention utilizes the internal chip of the television to detect the signal-to-noise ratio of the demodulated television signal, and classifies the detected signal-to-noise ratio in order from low to high. There are eight levels, and each level corresponds to different levels of antenna strength icons in the screen display OSD, similar to the antenna strength icons we see in mobile phones. When users watch TV programs, they can accurately see the strength of TV broadcast signals anytime and anywhere. When the signal strength is changing, the indication of the signal strength will also be displayed and changed, indicating that the signal is unstable at this time and reminding the user to pay attention. The signal strength intelligent identification method of the present invention provides a tool for users to identify signal strength conveniently and intuitively. In the case of not increasing the cost, the additional functions of the TV are increased, which brings greater added value to consumers.

Description of drawings

Fig. 1 is the antenna strength icon shown on the television screen among the present invention;

Fig. 2 is the specific flow chart diagram of signal strength intelligent identification method of the present invention;

Fig. 3 is a noise detection circuit diagram among the present invention;

Fig. 4 is the corresponding relationship figure of character and icon among the present invention;

Fig. 5 is a specific flowchart of the method for displaying antenna strength icons in the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The present invention indicates the strength of the current television broadcast signal by displaying icons as shown in Figure 1 on the TV screen, and the identification method of its signal strength is referring to the flow chart shown in Figure 2, including the following 4 steps:

2-1. Demodulate the input signal to obtain the demodulated TV signal.

2-2. After the demodulated TV signal is processed by the internal circuit of the TV, the value of the signal-to-noise ratio is obtained and stored in the register. This process is realized by the internal hardware circuit of the TV. The specific circuit is shown in Figure 3. The luminance signal in the TV signal is filtered by the capacitor C1 to remove the DC component, and enters the DC clamping circuit N1 for processing to obtain an effective luminance signal. The luminance signal here refers to the luminance signal after radio frequency processing, which can be obtained directly without processing the video signal. The output terminal of the DC clamping circuit N1 is connected to one gate of the system selection switch N2, and the other gate is connected to the input terminal of the video signal, and the system program will control the system selection switch N2 to select different brightness signals according to the current state. They are respectively sent to the subsequent sync separator N3 and noise detection circuit N4 for processing. The noise detection circuit is realized by the sound processing chip of TDA120 ^** series, in which there is hardware for detecting the signal-to-noise ratio of the demodulated TV signal, which is obtained by a certain algorithm according to the proportional relationship between the noise and the signal , and finally fed back to the three-bit register SN2..0 of the chip.

The resulting signal-to-noise ratio is given in the form of a read-only register. The value of reading this register SN2..0 is divided into eight levels from 0 to 7, and the corresponding signal-to-noise ratio values are: signal-to-noise ratio≤18dB, 18dB<SNR≤25dB, 25dB<SNR≤28dB, 28dB<SNR≤31dB, 31dB<SNR≤37dB, 37dB<SNR≤40dB, 40dB<SNR≤43dB, SNR Ratio > 43 Db. When the signal-to-noise ratio is less than 18dB, there is almost no synchronization, so this state is positioned as no signal; when the signal-to-noise ratio is greater than 37dB, TV programs can be watched very well, so the above state is positioned as Strong signal; the signal between these two states, although we can watch TV programs, but the effect is relatively poor, so it is positioned as a weak signal state.

2-3. Judging whether a display command is received from the user or the detected signal-to-noise ratio level has changed. If there is a request for a display command or a change in the signal-to-noise ratio level, enter the display processing program of 2-4, otherwise it will Continue to read the registers and wait for the next display command.

2-4. Display the corresponding antenna strength icon according to the SNR level.

The signal strength display of the present invention appears simultaneously with the TV channel number, and is displayed below the channel number, which requires a unified style with the channel number. Usually, the channel number of the TV is three digits, so our signal strength display is also composed of three characters, which also avoids the unattractive display caused by a single character display. If according to the usual method, eight states, each state is composed of three characters, so a total of 24 characters are needed, which is undoubtedly a waste for the character library. Therefore, the processing method of the present invention is simplified to 9 characters shown in Fig. 4, and a dynamic character combination is used, so that the display only needs to occupy the space of three characters, which effectively saves resources. The algorithm for character access is involved here, as can be clearly seen from accompanying drawing 5, its specific implementation method is:

5-1. Read out the value of the signal-to-noise ratio in the register;

5-2. Select the corresponding character combination according to the level of the signal-to-noise ratio. Among them, each character corresponds to an icon state, and the combination indicates the current signal strength, such as

When the SNR level is 0, the corresponding character is 088;

When the SNR level is 1, the corresponding character is 188;

When the SNR level is 2, the corresponding character is 128;

When the SNR level is 3, the corresponding character is 138;

When the SNR level is 4, the corresponding character is 148;

When the SNR level is 5, the corresponding character is 145;

When the SNR level is 6, the corresponding character is 146;

When the level of the signal-to-noise ratio is 7, the corresponding character is 147.

5-3. The character is downloaded and the corresponding antenna strength icon is displayed.

When we get the status value of the signal strength, we take the corresponding character combination corresponding to the corresponding state. It should be noted here that we use a dynamic character combination, so we must ensure that the three character addresses used cannot be downloaded repeatedly, otherwise will result in confusion of characters.

To sum up, the signal strength intelligent recognition technology mainly transforms the signal-to-noise ratio detection into familiar display icons to achieve the purpose of indicating the strength of the TV signal and tracking the stability of the TV signal. Viewing requirements, on the basis of not increasing the cost, maximize the added value of users. Of course, the above descriptions are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention shall also belong to protection scope of the present invention.

Claims (5)

1. the signal strength signal intensity intelligent identification Method in the television set, it is characterized in that: described recognition methods comprises following step:

Step 1, input signal is carried out demodulation, obtain the TV signal after the demodulation;

Step 2, the TV signal after the demodulation is obtained the value of signal to noise ratio after the television set internal circuit is handled, deposit register in; The value of reading this register is divided into eight grades of 0-7 altogether, Dui Ying snr value is respectively: signal to noise ratio≤18dB, 18dB＜signal to noise ratio≤25dB, 25dB＜signal to noise ratio≤28dB, 28dB＜signal to noise ratio≤31dB, 31dB＜signal to noise ratio≤37dB, 37dB＜signal to noise ratio≤40dB, 40dB＜signal to noise ratio≤43dB, signal to noise ratio＞43dB;

Step 3, judge whether to receive that change has taken place for user's request display command or detected signal to noise ratio grade, if when having request display command or signal to noise ratio grade to change, the demonstration that enters next step is handled, otherwise just continues to read register, waits for next display command;

Step 4, show corresponding antenna intensity icon according to the signal to noise ratio grade.

2. the signal strength signal intensity intelligent identification Method in the television set according to claim 1, it is characterized in that: in the TV signal after described demodulation, luminance signal enters the clamped processing of circuit of direct current after an electric capacity elimination DC component, its output connects sync separator and noise circuit for detecting, and described noise circuit for detecting is input to the signal to noise ratio that detects in the register.

3. the signal strength signal intensity intelligent identification Method in the television set according to claim 2, it is characterized in that: the output of the clamped circuit of described direct current links to each other with wherein one road gating end of a system selector switch, another road gating end connects video signal input terminal, and the output of described system selector switch connects described sync separator and noise circuit for detecting respectively.

4. the signal strength signal intensity intelligent identification Method in the television set according to claim 1 and 2 is characterized in that: described antenna intensity map target display packing may further comprise the steps:

The value of signal to noise ratio in step 1, the readout register;

Step 2, select the corresponding characters combination according to the grade of signal to noise ratio; Wherein, the corresponding a kind of icon state of each character, the expression current signal intensity combines;

Step 3, character are downloaded and demonstration respective antenna intensity icon.

5. the signal strength signal intensity intelligent identification Method in the television set according to claim 4 is characterized in that: adopt 9 kinds of icon state of 9 character representations, the antenna intensity icon of grade all adopts 3 character combinations to represent arbitrarily.

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