WO2015078416A1

WO2015078416A1 - Television signal receiving module and receiving method

Info

Publication number: WO2015078416A1
Application number: PCT/CN2014/092551
Authority: WO
Inventors: 张金密
Original assignee: 乐视致新电子科技（天津）有限公司
Priority date: 2013-11-29
Filing date: 2014-11-28
Publication date: 2015-06-04
Also published as: CN103686011A

Abstract

Disclosed are a television signal receiving module and receiving method. The television signal receiving module comprises a digital-to-analogue integrated tuner, a system on chip (SOC) and an audio and video switching chip. A radio-frequency signal is converted into an intermediate-frequency digital signal or analogue signal through the digital-to-analogue integrated tuner; the intermediate-frequency digital signal is demodulated and decoded into an analogue video signal and an analogue audio signal by the system on chip (SOC); and the analogue signal is switched through an audio-video switching chip; alternatively, switching and program allocation are conducted on the processed analogue video signal and analogue audio signal, so that the television signal receiving module has both the digital signal receiving and processing function and the traditional analogue signal receiving and processing function.

Description

Television signal receiving module and receiving method

cross reference

The present application is hereby incorporated by reference in its entirety in its entirety in its entirety in its entirety in its entirety in the the the the the the the the the

Technical field

The present application relates to the field of televisions, and in particular, to a television signal receiving module and a receiving method.

Background technique

With the development of communication technology, traditional analog TV is gradually unable to meet the demand for watching more and more TV programs, and digital TV has higher image and sound quality levels than traditional analog TV, and can receive more. TV shows and other digital messages, so digital TV has gradually integrated into people's daily lives.

At present, the global digital television broadcasting system is roughly divided into several standards, such as Digital Video Broadcasting (DVB), Advanced Television Standards Committee (ATSC), Integrated Services Digital Broadcasting (ISDB), and Digital Television Terrestrial Broadcasting (DTMB). However, the current analog TVs cannot all be turned off in a short period of time. Moreover, the existing TVs are mostly single analog TVs or digital TVs with signal sources, or by adding a set-top box to the analog TV. The function of the digital television channel is easy to take up too much space, and in operation, the user has to switch between different machines, which is extremely inconvenient.

Summary of the invention

The technical problem to be solved by the present application is to provide a television signal receiving module and a receiving method, which enable the television signal receiving module to receive and process digital signals through the synergy of the digital-analog integrated tuner, the system chip SOC, and the audio-video switching chip. Compared with the function of the traditional analog signal, the problem that the conventional TV can only receive the digital signal can be realized only by the external set-top box.

In order to solve the above problems, the present application discloses a television signal receiving module, including a digital module. Body tuner, system chip SOC, and audio and video switching chip. A digital-to-analog tuner is used to convert a radio frequency signal into an intermediate frequency digital signal or an analog signal. The system chip SOC has a demodulator and a decoder. The system chip SOC is electrically connected to the digital-to-analog tuner for receiving the intermediate frequency digital signal, and demodulating and decoding the intermediate frequency digital signal into an analog video signal and an analog audio signal. The audio and video switching chip is electrically connected to the digital-analog integrated tuner and the system chip SOC, respectively, for receiving the analog signal sent by the digital-analog integrated tuner, or the analog video signal and the analog audio signal sent by the system chip SOC, and the logarithm The analog signal sent by the analog tuner or the analog video signal sent by the system chip SOC is switched and distributed with the analog audio signal.

The present application also discloses a television signal receiving method, comprising: receiving a radio frequency signal through a digital-analog integrated tuner and converting the radio frequency signal into an intermediate frequency digital signal or an analog signal; receiving an intermediate frequency digital signal through the system chip SOC and demodulating and decoding the same For analog video signals and analog audio signals; and receiving analog signals from the digital-to-analog tuner through the audio-video switching chip, or receiving analog video signals and analog audio signals from the system chip SOC, and transmitting to the digital-to-analog tuner The analog signal is either switched or distributed between the analog video signal sent by the system chip SOC and the analog audio signal.

BRIEF abstract

FIG. 1 is a block diagram of a television signal receiving module according to a first embodiment of the present application.

FIG. 2 is a flowchart of a method for receiving a television signal according to a first application embodiment of the present application.

FIG. 3 is a flowchart of a method for receiving a television signal according to a second application embodiment of the present application.

4 is a block diagram of a television signal receiving module according to a second embodiment of the present application.

FIG. 5 is a flowchart of a method for receiving a television signal according to a third application embodiment of the present application.

Preferred embodiment of the present application

The embodiments of the present application will be described in detail below with reference to the drawings and the embodiments, so that the application of the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.

Certain terms are used throughout the description and claims to refer to particular components. Technology in the field The surgeon should understand that hardware manufacturers may use different nouns to refer to the same component. The present specification and the claims do not use the difference in the name as the means for distinguishing the components, but the difference in function of the components as the criterion for distinguishing. The word "comprising" as used throughout the specification and claims is an open term and should be interpreted as "including but not limited to". "Substantially" means that within the range of acceptable errors, those skilled in the art will be able to solve the technical problems within a certain error range, substantially achieving the technical effects. In addition, the term "coupled" or "electrically connected" is used herein to include any direct and indirect electrical coupling means. Therefore, if a first device is coupled to a second device, the first device can be directly electrically coupled to the second device, or electrically coupled indirectly through other devices or coupling means. Connected to the second device. The description of the specification is intended to be illustrative of the preferred embodiments of the invention. The scope of protection of the application is subject to the definition of the appended claims.

As shown in FIG. 1 , the television signal receiving module 10 disclosed in the first embodiment of the present application includes a digital-to-analog tuner 110 , a system chip SOC 120 , and an audio and video switching chip 130 .

The digital-to-analog tuner 110 includes a radio frequency (RF) front end circuit including a low noise amplifier, a tracking band pass filter, a preconditioning circuit, a mixing circuit, a first intermediate frequency (IF) processing circuit, and a second intermediate frequency processing circuit. A digital front end circuit or the like, wherein the intermediate frequency processing circuit includes a variable gain amplifier. In addition, the digital-to-analog tuner 110 has a signal interface 111 for receiving radio frequency signals through a cable. Moreover, the digital-to-analog tuner 110 integrates the functions of tuning analog signals and digital signals to receive radio signals such as conventional analog signals and increasingly widely used digital signals, and converts them into intermediate frequency digital signals IF; or conversion It is an analog signal such as an analog video signal CVBS and an analog audio signal SIF.

The system chip SOC 120 is electrically connected to the digital-to-analog tuner 110 for receiving the intermediate frequency digital signal IF. The system chip SOC 120 has a demodulator and a decoder, and has the functions of demodulating and decoding the television signal. The decoder built in the system chip SOC 120 may be, but not limited to, a plurality of decoders. Format video decoder and audio decoder, multi-format video decoder can support standard definition MPEG-2, H.264 and AVS streams, while audio decoder can support MPEG-1, MPEG-2, MPEG-2 AAC and Du More than the format of the digital AC-3. Therefore, after receiving the intermediate frequency digital signal IF, the system chip SOC 120 is further configured to demodulate the intermediate frequency digital signal IF into a transport stream (TS), and further decode into a standard audio/video signal, for example, The transport stream is decoded into an analog video signal YPbPR and an analog audio signal L/R that conform to the Audio Video Coding Standard (AVS) of Digital Terrestrial Multimedia Broadcast (DTMB).

The audio and video switching chip 130 is electrically connected to the digital-to-analog tuner 110 and the system chip SOC 120, respectively, for receiving the analog video signal CVBS and the analog audio signal SIF sent by the digital-analog integrated tuner 110, or by the system chip SOC 120. The transmitted analog video signal YPbPR and the analog audio signal L/R, and the analog video signal CVBS and the analog audio signal SIF of the digital-to-analog tuner 110; or the analog video signal YPbPR of the system chip SOC 120 and the analog audio signal L/ R is switched and assigned.

Based on the foregoing architecture, the television signal module disclosed in the first embodiment of the present application is further described in the following by an application embodiment for receiving and processing a television signal.

Referring to FIG. 2, a method for receiving a television signal according to a first application embodiment of the present application includes:

Step S110, receiving a radio frequency signal through a digital-analog integrated tuner and converting the radio frequency signal into an intermediate frequency digital signal or an analog signal;

Step S120, receiving an intermediate frequency digital signal through the system chip SOC, and demodulating and decoding the same into an analog video signal and an analog audio signal;

Step S130, receiving an analog signal from the digital-analog integrated tuner through the audio-video switching chip; or receiving an analog video signal and an analog audio signal from the system chip SOC, and transmitting the analog signal sent by the digital-to-analog tuner or the system chip SOC The analog video signal and the analog audio signal are switched and distributed.

As shown in FIG. 1 and FIG. 2, based on the above steps, when the digital-to-analog tuner 110 receives the radio frequency signal and converts the radio frequency signal into the intermediate frequency digital signal IF or the analog video signal CVBS and the analog audio signal SIF, if the signal is The analog video signal CVBS and the analog audio signal SIF, the digital-analog integrated tuner 110 sends the analog video signal CVBS and the analog audio signal SIF to the audio-video switching chip 130 for subsequent processing; conversely, if the signal is the intermediate frequency digital signal IF, the digital-to-analog integrated Tuner 110 transmits this intermediate frequency digital signal IF to system chip SOC 120.

After receiving the intermediate frequency digital signal IF, the system chip SOC 120 first demodulates the intermediate frequency digital signal IF, wherein the demodulator of the system chip SOC 120 determines the phase of the received signal and according to the predetermined The decoding scheme maps it back to the symbols it represents to recover the original predetermined format content. Then, decoding is performed to convert the intermediate frequency digital signal IF into an analog video signal YPbPR and an analog audio signal L/R. Thereafter, the system chip SOC 120 transmits the analog video signal YPbPR and the analog audio signal L/R to the audio and video switching chip 130, and switches and distributes the analog video signal YPbPR and the analog audio signal L/R through the audio/video switching chip 130. Processing, so that the television signal receiving module realizes the receiving and processing of digital signals (such as DTMB signals), and has the functions of receiving and processing analog signals and digital signals.

In addition, in other embodiments of the present application, an automatic gain control circuit (AGC) and/or an I ² C bus may be electrically connected between the digital-to-analog tuner 110 and the system chip SOC 120.

The automatic gain control circuit is configured to detect the intermediate frequency digital signal IF, adjust the amplitude of the intermediate frequency digital signal IF according to the detection result, and feed back the adjusted intermediate frequency digital signal IF back to the system chip SOC 120, wherein the automatic gain control circuit mainly controls the intermediate frequency The gain of the amplifier or high frequency amplifier causes the output of the digital-to-analog tuner 110 to not change due to a sudden change in the input signal strength, that is, a correspondingly varying DC voltage (AGC voltage) as the amplitude of the input signal changes, utilizing this A voltage is used to control the amplification factor of a variable gain amplifier (or to control the attenuation of a variable attenuation circuit); when the input signal amplitude is large, the amplification of the AGC voltage control variable gain amplifier is reduced (or increased) Large variable attenuation circuit attenuation); and when the input signal amplitude is relatively small, the AGC voltage controls the amplification gain of the variable gain amplifier to increase (or reduces the attenuation of the variable attenuation circuit), thereby achieving the purpose of substantially stable output signal amplitude. .

The I ² C bus is used to initialize the digital-analog integrated tuner 110 and a tuning frequency set by the transmission system chip SOC 120 to the digital-to-analog tuner 110, so that the digital-to-analog tuner 110 locks a receiving channel according to the tuning frequency. And receiving radio frequency signals from the receiving channel. The digital-to-analog tuner 110 then outputs the converted intermediate frequency digital signal IF to the system chip SOC 120, thereby completing the signal locking and outputting the intermediate frequency digital signal IF.

Referring to FIG. 1 and FIG. 3, therefore, in the television signal receiving method disclosed in the second application embodiment of the present application, the radio frequency signal is converted into an intermediate frequency digital signal, compared to the television signal receiving method in the first application embodiment. The operation of the IF and the operation of demodulating and decoding the intermediate frequency digital signal IF into an analog video signal YPbPR and an analog audio signal L/R further include the following steps:

Step S111, detecting the intermediate frequency digital signal IF by the automatic gain control circuit, and according to the check The measurement result corresponds to adjusting the amplitude of the IF digital signal IF;

In step S112, the adjusted intermediate frequency digital signal IF is fed back to the system chip SOC 120.

Moreover, the following steps are included in the process of receiving and converting the radio frequency signal:

Step S101, the system chip SOC 120 initializes the digital-to-analog tuner 110 through the I ² C bus and transmits the tuning frequency to the digital-to-analog tuner 110;

In step S102, the digital-to-analog tuner 110 locks the corresponding receiving channel according to the set tuning frequency, and receives the radio frequency signal from the receiving channel.

Thereafter, the digital-to-analog tuner 110 performs the steps of converting the radio frequency signal into the intermediate frequency digital signal IF and outputting the intermediate frequency digital signal IF to the system chip SOC 120, thereby completing the signal locking and outputting the intermediate frequency digital signal IF.

In addition, in some embodiments of the present application, an audio operational amplifier is electrically connected between the system chip SOC 120 and the audio and video switching chip 130 to receive the analog audio signal L/R from the system chip SOC 120, and Filtering and amplifying the analog audio signal L/R, then transmitting the processed analog audio signal L/R to the audio and video switching chip 130; and a video filter for receiving the analog video signal from the system chip SOC 120 YPbPR, and filtering the analog video signal YPbPR, and then transmitting the processed analog video signal YPbPR to the audio-video switching chip 130.

Referring to FIG. 4, the second embodiment of the present application is substantially the same as the architecture of the first embodiment. The difference between the two is that the television signal receiving module 20 disclosed in the second embodiment of the present application has a digital-to-analog tuner 210. In addition to the system chip SOC 220 and the audio and video switching chip 230, an automatic gain control circuit 240, an I ² C bus 250, a video filter 260, and an audio operational amplifier 270 are also included.

The automatic gain control circuit 240 and the I ² C bus 250 are electrically connected between the digital-to-analog tuner 210 and the system chip SOC 220, respectively. The automatic gain control circuit 240 is configured to detect the intermediate frequency digital signal IF and adjust the amplitude of the intermediate frequency digital signal IF according to the detection result. For example, when the intensity of the intermediate frequency digital signal IF is weak, the intermediate frequency digital signal IF is amplified, and the adjusted intermediate frequency digital is used. The signal IF is output to the system chip SOC 220. The I ² C bus 250 is configured to initialize the digital-analog tuner 210 and the tuning frequency set by the transmission system chip SOC 220 to the digital-to-analog tuner 210, so that the digital-to-analog tuner 210 locks a receiving channel according to the tuning frequency, and The radio frequency signal is received from the receiving channel to achieve the function of searching and locking signals.

The video filter 260 and the audio operational amplifier 270 are electrically connected between the system chip SOC 220 and the audio and video switching chip 230, respectively, wherein the video filter 260 is configured to receive the analog video signal YPbPR from the system chip SOC 220, and to the analog video signal. YPbPR performs filtering processing, and then sends the processed analog video signal YPbPR to the audio and video switching chip 230; and the audio operational amplifier 270 is used to receive the analog audio signal L/R from the system chip SOC 220, and the analog audio signal L/R The filtering and amplification processing is performed, and then the processed analog audio signal L/R is transmitted to the audio-video switching chip 230.

Based on the above architecture, the digital-to-analog tuner 210 is responsible for receiving digital signals, and the search function is controlled by the system chip SOC 220 through the I ² C bus 250. When the digital-to-analog tuner 210 locks the channel, it is responsible for outputting the intermediate frequency digital signal. The IF is given to the system chip SOC 220. Next, after receiving the intermediate frequency digital signal IF, the system chip SOC 220 sequentially demodulates and decodes the intermediate frequency digital signal IF, and converts the intermediate frequency digital signal IF into an analog video signal YPbPR and an analog audio signal L/R. Then, the system chip SOC 220 outputs the analog video signal YPbPR to the video filter 260 for RCL filtering processing; and outputs the analog audio signal L/R to the audio operational amplifier 270 for filtering and amplification processing. Thereafter, the processed analog video signal YPbPR and the analog audio signal L/R are respectively sent to the audio-video switching chip 230 through the video filter 260 and the audio operational amplifier 270 for subsequent processing.

The television signal module disclosed in the second embodiment of the present application is further described with reference to an application embodiment for receiving and processing a television signal.

Referring to FIG. 4 and FIG. 5, the television signal receiving method disclosed in the third application embodiment of the present application includes the following steps:

Step S310, the system chip SOC 220 initializes the digital-to-analog tuner 210 through the I ² C bus 250 and transmits the tuning frequency to the digital-to-analog tuner 210;

Step S320, the digital-to-analog tuner 210 locks the corresponding receiving channel according to the set tuning frequency, and receives the radio frequency signal from the receiving channel;

Step S330, the digital-to-analog tuner 210 converts the radio frequency signal into an intermediate frequency digital signal IF or an analog video signal CVBS and an analog audio signal SIF, wherein if the signal is an analog video signal The CVBS and the analog audio signal SIF, the digital-analog integrated tuner 210 transmits the analog video signal CVBS and the analog audio signal SIF to the audio-video switching chip 230 for subsequent processing; conversely, if the signal is the intermediate frequency digital signal IF, the digital-to-analog tuner 210 Sending the intermediate frequency digital signal IF to the system chip SOC 220;

Step S340, detecting the intermediate frequency digital signal IF by the automatic gain control circuit 240, and adjusting the amplitude of the intermediate frequency digital signal IF according to the detection result;

Step S350, the adjusted intermediate frequency digital signal IF is output to the system chip SOC 220;

Step S360, demodulating and decoding the intermediate frequency digital signal IF by the system chip SOC 220 into an analog video signal YPbPR and an analog audio signal L/R, wherein the intermediate frequency digital signal IF is first demodulated into a transport stream (TS), and then decoded. For analog video signal YPbPR and analog audio signal L/R;

Step S370, filtering the analog video signal YPbPR through the video filter 260;

Step S380, filtering and amplifying the analog audio signal L/R by the audio operational amplifier 270;

Step S390, receiving the analog video signal CVBS and the analog audio signal SIF through the audio/video switching chip 230, or receiving the analog video signal YPbPR and the analog audio signal L/R, and pairing the analog video signal CVBS and the analog audio signal SIF; or simulating The video signal YPbPR is switched and distributed with the analog audio signal L/R, thereby achieving the functions of receiving and processing analog signals and digital signals.

It is also to be understood that the terms "comprises", "comprising" or "comprising" or any other variations are intended to encompass a non-exclusive inclusion, such that a process, method, article, or Other elements not explicitly listed, or elements that are inherent to such a process, method, commodity, or system. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or system including the element, without further limitation.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment in combination of software and hardware. Moreover, the application may employ computer-usable storage media (including but not limited to disk storage, in one or more of the computer-usable program code embodied therein. The form of a computer program product implemented on a CD-ROM, optical memory, or the like.

The above description is only an embodiment of the present application and is not intended to limit the application. Various changes and modifications can be made to the present application by those skilled in the art. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included within the scope of the appended claims.

Industrial applicability

The television signal receiving module and the receiving method of the present application receive a radio frequency signal through a digital-analog integrated tuner and convert it into an intermediate frequency digital signal or an analog signal (for example, an analog video signal CVBS and an analog audio signal SIF); The intermediate frequency digital signal is demodulated and decoded to be converted into an analog video signal and an analog audio signal (for example, an analog video signal YPbPr and an analog audio signal L/R); and the analog video signal and the analog audio signal are performed by an audio/video switching chip. Switching and assigning to achieve the function of receiving and processing digital signals. Therefore, the television signal receiving module and the receiving method of the present application can receive and process the traditional analog signal in addition to the digital signal, so that different viewing requirements can be balanced, and the television signal receiving module of the present application can be completely Built into the smart TV, users can view digital TV programs without having to configure the set-top box, which is quite simple in operation and saves space.

Claims

A television signal receiving module, comprising:

A digital-to-analog tuner for converting a radio frequency signal into an intermediate frequency digital signal or an analog signal;

a system chip SOC having a demodulator and a decoder, the system chip SOC being electrically connected to the digital-to-analog tuner for receiving the intermediate frequency digital signal, and demodulating and decoding the intermediate frequency digital signal into Analog video signals and analog audio signals;

The audio and video switching chip is electrically connected to the digital-to-analog tuner and the system chip SOC, respectively, for receiving the analog signal sent by the digital-analog integrated tuner, or for receiving the system chip The analog video signal sent by the SOC and the analog audio signal, and the analog signal sent by the digital-to-analog tuner or the analog video signal and the analog audio signal sent by the system chip SOC Switch and assign.
The television signal receiving module of claim 1 further comprising:

An automatic gain control circuit electrically connected between the digital-analog integrated tuner and the system chip SOC, configured to detect the intermediate frequency digital signal, adjust the amplitude of the intermediate frequency digital signal according to the detection result, and adjust the amplitude The intermediate frequency digital signal is fed back to the system chip SOC.
The television signal receiving module of claim 1 further comprising:

An I 2 C bus electrically connected between the digital-to-analog tuner and the system chip SOC for initializing the digital-to-analog tuner and transmitting a tuning frequency of the system chip SOC setting to the And a digital-to-analog tuner, wherein the digital-to-analog tuner locks a receiving channel according to the tuning frequency, and receives the radio frequency signal from the receiving channel.
The television signal receiving module of claim 1 further comprising:

An audio operational amplifier electrically connected between the system chip SOC and the audio and video switching chip, configured to filter and amplify the analog audio signal, and send the processed analog audio signal to the Said audio and video switching chip;

a video filter electrically connected between the system chip SOC and the audio and video switching chip, configured to perform filtering processing on the analog video signal, and send the processed analog video signal to the sound Video switching chip.
A television signal receiving module according to claim 1, wherein:

The intermediate frequency digital signal is a digital television terrestrial broadcast signal.
A television signal receiving method, comprising:

Receiving a radio frequency signal through a digital-to-analog tuner and converting the radio frequency signal into an intermediate frequency digital signal or an analog signal;

Demodulating and decoding the intermediate frequency digital signal into an analog video signal and an analog audio signal by a system chip SOC;

Receiving the analog signal from the digital-analog integrated tuner through an audio-video switching chip, or receiving the analog video signal and the analog audio signal from the system chip SOC, and transmitting the analog-to-analog tuner The analog signal or the analog video signal sent by the system chip SOC is switched and distributed with the analog audio signal.
A television signal receiving method according to claim 6, wherein an operation of converting said radio frequency signal into said intermediate frequency digital signal and demodulating and decoding said intermediate frequency digital signal into said analog video signal and said Between the operation of the analog audio signal, it also includes:

Detecting the intermediate frequency digital signal by an automatic gain control circuit, and adjusting an amplitude of the intermediate frequency digital signal according to the detection result;

The adjusted intermediate frequency digital signal is output to the system chip SOC.
The method for receiving a television signal according to claim 6, wherein the receiving the operation of the radio frequency signal further comprises:

The corresponding receiving channel is locked according to the set tuning frequency, and the radio frequency signal is received from the receiving channel.
A television signal receiving method according to claim 6, wherein said IF digital signal is demodulated and decoded into operation of said analog video signal and said analog audio signal and said analog video signal is said Between the operation of the analog audio signal, it also includes:

Filtering and amplifying the analog audio signal;

Filtering the analog video signal.
A television signal receiving method according to claim 6, wherein

The intermediate frequency digital signal is a digital television terrestrial broadcast signal.