CN215268502U

CN215268502U - Digital television signal receiving module

Info

Publication number: CN215268502U
Application number: CN202121495424.1U
Authority: CN
Inventors: 梁兆林
Original assignee: Shenzhen Honestar Electronic Co ltd
Current assignee: Shenzhen Honestar Electronic Co ltd
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2021-12-21
Anticipated expiration: 2031-07-01

Abstract

The utility model discloses a digital television signal receiving module, which comprises an EOC filter circuit, wherein the EOC filter circuit is electrically connected with a Wi-Fi filter circuit through a lead, the Wi-Fi filter circuit is electrically connected with an ESD protection circuit through a lead, and a tuner is electrically connected with the ESD protection circuit, a demodulator and a decoder through leads; the EOCfilter circuit is a high-pass filter circuit, and the Wi-Fi filter circuit is a high-frequency wave trap circuit. The method and the device can inhibit and prevent the EOC low-frequency uplink signal which is mixed in the cable network for transmission from entering the tuner, avoid the EOC low-frequency signal from interfering with the useful signal, and simultaneously can avoid the Wi-Fi signal in the environment from entering the tuner to interfere with the useful signal, so that the anti-jamming capability of the set top box is improved.

Description

Digital television signal receiving module

Technical Field

The utility model relates to a TV set-top box field, concretely relates to digital television signal receiving module.

Background

Digital television set-top boxes are popular today, but today's set-top boxes typically support only a single digital television standard. The set-top boxes are generally divided into three types according to the propagation mode of received signals, one is a DVB-S satellite digital television set-top box, the other is a DVB-C cable digital television set-top box, and the other is a DVB-T2 terrestrial wave digital television set-top box.

At present, the demand of the existing set-top box is increasing, but the anti-interference (insufficient capacity) of the existing set-top box is a difficult problem of the television signal receiver, and meanwhile, the existing digital television set-top box cannot support the reception of different types of signals at the same time, and the practicability is poor, so that a digital television signal receiving module is urgently needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's is not enough, adapts to reality needs, provides a digital television signal receiving module that the interference killing feature is strong, can receive different grade type signal simultaneously.

In order to realize the technical purpose, the utility model discloses a scheme is: a digital television signal receiving module comprises an EOC filter circuit, a tuner, a demodulator and a decoder, wherein the EOC filter circuit is electrically connected with a Wi-Fifilter circuit through a lead, the Wi-Fi filter circuit is electrically connected with an ESD protection circuit through a lead, and the tuner is electrically connected with the ESD protection circuit, the demodulator and the decoder through leads respectively;

the EOC filter circuit is a high-pass filter circuit, the EOC filter circuit is accessed to a radio frequency signal through an RF port, and the Wi-Fi filter circuit is a high-frequency trap circuit;

the tuner is in communication connection with the decoder through an I2C interface, the tuner is electrically connected with the demodulator through an IF interface and an AGC interface, and the demodulator is electrically connected with the decoder through a TS signal flow interface.

Preferably, the tuner is an MXL608 type silicon tuner chip supporting an input tuning range of 44MHz to 1002 MHz.

Preferably, the tuner is internally provided with an AGC automatic gain control circuit, a local oscillator generation and channel selection circuit and an intermediate frequency filter circuit.

Preferably, the demodulator is a DVB-C and DVB-T2 demodulation chip matched with a back end, and the decoder is a decoding chip supporting streaming media playing.

The utility model has the advantages that: (1) through the EOC filter circuit and the Wi-Fi filter circuit that set up, EOC filter circuit is high pass filter circuit, can restrain and prevent that the EOC low frequency uplink signal that mixes the transmission in cable network from entering into the tuner, avoids EOC low frequency signal to disturb useful signal, and Wi-Fi filter circuit high frequency trapper circuit avoids Wi-Fi signal to enter into the tuner and disturbs useful signal in the environment simultaneously to improve the interference killing feature of STB.

(2) The decoder and the demodulator are arranged, the demodulator is a DVB-C and DVB-T2 demodulation chip matched with the rear end, the decoder is a decoding chip supporting streaming media playing, the cooperation of the decoder and the demodulator is convenient for a user to conveniently select and watch two digital television program sources of different systems according to the using environment and conditions, and the user can conveniently select and watch digital broadcast television or streaming media network movie television programs by using one set top box.

(3) Through the set tuner, an AGC circuit, a local oscillator generation and channel selection circuit and an intermediate frequency filter circuit are arranged in the tuner, the AGC circuit can amplify signals, the local oscillator generation and channel selection circuit can select signal channels for the signals, and the intermediate frequency filter circuit can filter the signals.

Drawings

Fig. 1 is a block diagram of the system structure of the set-top box of the present invention;

fig. 2 is a schematic diagram of a circuit principle module of the digital television signal receiving module of the present invention;

FIG. 3 is a schematic diagram of a digital television signal receiving module circuit principle module of the present invention

FIG. 4 is a schematic diagram of the EOC filter circuit of the present invention;

fig. 5 is a characteristic curve diagram of the EOC filter simulation S21 of the present invention;

FIG. 6 is a schematic diagram of the Wi-Fi filter circuit of the present invention;

FIG. 7 is a graph of the characteristics of the Wi-Fi filter simulation S21 of the present invention;

fig. 8 is a circuit diagram of AGC automatic gain control of the present invention;

fig. 9 is a circuit diagram of a tuner reset circuit according to the present invention;

fig. 10 is a circuit diagram of a tuner power supply according to the present invention.

Detailed Description

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

As shown in fig. 1-10, a specific embodiment of the present invention is a digital tv signal receiving module, including an EOC filter circuit, a Wi-Fi filter circuit, an ESD protection circuit, a tuner, a demodulator and a decoder, the ESD protection circuit can make a radio frequency signal avoid static electricity, the EOC filter circuit is electrically connected with the Wi-Fi filter circuit through a wire, the Wi-Fi filter circuit is electrically connected with the ESD protection circuit through a wire, the tuner is electrically connected with the ESD protection circuit, the demodulator and the decoder through wires respectively; the EOC filter circuit accesses a radio frequency signal through an RF port; the tuner is in communication connection with the decoder through an I2C interface, the tuner is electrically connected with the demodulator through an IF interface and an AGC interface, and the demodulator is electrically connected with the decoder through a TS signal flow interface.

The EOC filter circuit is a high-pass filter circuit, EOC low-frequency uplink signals which are transmitted in a cable network in a mixed mode can be restrained and prevented from entering the tuner, interference of the EOC low-frequency signals with useful signals is avoided, the Wi-Fi filter circuit is a high-frequency trap circuit, and interference of Wi-Fi signals in the environment with the useful signals caused by the fact that the Wi-Fi signals enter the tuner is avoided.

The tuner communicates with the decoder through the I2C interface, and the decoder controls the tuner driver by calling a software API application interface. The tuner is an MXL608 type silicon tuner chip supporting an input tuning range of 44MHz to 1002 MHz.

The tuner converts the input high-frequency radio-frequency signal into a programmable intermediate frequency IF output after internal processing of the tuner.

The tuner is internally provided with an AGC automatic gain control circuit, a local oscillator generation and channel selection circuit and an intermediate frequency filter circuit, the AGC automatic gain control circuit can amplify signals, the local oscillator generation and channel selection circuit can select signal channels for the signals, the intermediate frequency filter circuit can filter the signals, the radio frequency signal amplification gain can be set to be controlled by the tuner, and the rear-end demodulator can also be set to feed back AGC control signals to the tuner for control.

The tuner is matched with DVB-C and DVB-T2 demodulation chips at the rear end, so that a user can conveniently select and watch two digital television program sources with different systems according to the using environment and conditions, the decoder is a decoding chip supporting streaming media playing, and the user can conveniently select and watch digital broadcast television or streaming media network movie television programs by using one set top box.

The application provides a digital television signal receiving module, when in use, a radio frequency signal is accessed from an RF terminal, then passes through an EOC filter circuit, the EOC filter circuit can inhibit and prevent an EOC low-frequency uplink signal which is transmitted in a cable network from entering a tuner, the EOC low-frequency signal is prevented from interfering a useful signal, then passes through a Wi-Fi filter circuit, the Wi-Fi filter circuit is prevented from entering the tuner to interfere the useful signal in the environment, then passes through an ESD protection circuit, the ESD protection circuit can prevent the tuner from being damaged by static electricity, misoperation and fault prevention of electronic equipment are performed in the bud, finally the tuner enters the tuner, then the tuner communicates with a decoder through an I2C interface, and meanwhile, the tuner converts an input high-frequency radio frequency signal into programmable intermediate frequency IF output after being processed inside the tuner, and the tuner is internally provided with an AGC automatic gain control circuit which can amplify signals, a local oscillator generation and channel selection circuit can select signal channels for the signals, and an intermediate frequency filter circuit can filter the signals.

According to the set top box, the EOC filter circuit and the Wi-Fi filter circuit are arranged, the EOC filter circuit is a high-pass filter circuit, EOC low-frequency uplink signals which are mixed in cable network and transmitted can be inhibited and prevented from entering a tuner, EOC low-frequency signals are prevented from interfering with useful signals, meanwhile, the Wi-Fi filter circuit is a high-frequency wave trap circuit, Wi-Fi signals in the environment are prevented from entering the tuner to interfere with the useful signals, and therefore the anti-jamming capability of the top box is improved; the demodulator is a DVB-C and DVB-T2 demodulation chip matched with the rear end, the decoder is a decoding chip supporting the streaming media playing, and the matching of the decoder and the demodulator is convenient for a user to conveniently select and watch two digital television program sources of different systems according to the using environment and conditions, and simultaneously the user can conveniently select and watch digital broadcasting television or streaming media network movie television programs by using one set top box; the tuner is internally provided with an AGC automatic gain control circuit, a local oscillator generation and channel selection circuit and an intermediate frequency filter circuit, wherein the AGC automatic gain control circuit can amplify signals, the local oscillator generation and channel selection circuit can select signal channels for the signals, and the intermediate frequency filter circuit can filter the signals.

The utility model discloses there is following beneficial effect: (1) through the EOC filter circuit and the Wi-Fi filter circuit that set up, EOC filter circuit is high pass filter circuit, can restrain and prevent that the EOC low frequency uplink signal that mixes the transmission in cable network from entering into the tuner, avoids EOC low frequency signal to disturb useful signal, and Wi-Fi filter circuit high frequency trapper circuit avoids Wi-Fi signal to enter into the tuner and disturbs useful signal in the environment simultaneously to improve the interference killing feature of STB.

The above, only do the preferred embodiment of the present invention, not used to limit the present invention, all the technical matters of the present invention should be included in the protection scope of the present invention for any slight modification, equivalent replacement and improvement of the above embodiments.

Claims

1. A digital television signal receiving module, characterized by: the EOC filter circuit is electrically connected with the Wi-Fifilter circuit through a lead, the Wi-Fifilter circuit is electrically connected with the ESD protection circuit through a lead, and the tuner is respectively electrically connected with the ESD protection circuit, the demodulator and the decoder through leads;

2. The digital television signal receiving module of claim 1, wherein: the tuner is an MXL608 type silicon tuner chip supporting an input tuning range of 44MHz to 1002 MHz.

3. The digital television signal receiving module of claim 1, wherein: and an AGC automatic gain control circuit, a local oscillator generation and channel selection circuit and an intermediate frequency filter circuit are arranged in the tuner.

4. The digital television signal receiving module of claim 1, wherein: the demodulator is a DVB-C and DVB-T2 demodulation chip matched with the rear end, and the decoder is a decoding chip supporting streaming media playing.