CN100556090C - TV receiving method and device, audio/video demodulator and coding/decoding method based on PC - Google Patents
TV receiving method and device, audio/video demodulator and coding/decoding method based on PC Download PDFInfo
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- CN100556090C CN100556090C CNB2005101006985A CN200510100698A CN100556090C CN 100556090 C CN100556090 C CN 100556090C CN B2005101006985 A CNB2005101006985 A CN B2005101006985A CN 200510100698 A CN200510100698 A CN 200510100698A CN 100556090 C CN100556090 C CN 100556090C
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Abstract
A kind of TV receiving method and device, audio/video demodulator and coding/decoding method based on PC, demodulation comes the medium-frequency TV signal of the predetermined intermediate frequency carrier wave of self-tuner, and produces a large amount of CVBS composite video data; Utilize the fast interface of PC, comprise PCI-express, USB2.0 interface, the data flow that will comprise described CVBS video data sends on the PC in real time, thereby utilize the CPU of PC main frame and video card resource to finish part and separate whole decoding work that is in harmonious proportion, obtain corresponding view data and show for display.The TV receiving system of utilizing the present invention to design has the advantage that hardware is extremely simplified, product cost is low, and more helps improving the convenience of image definition and upgrade maintenance.Even can easily TV receiving system be integrated on the PC mainboard.
Description
Technical field
The present invention relates to color television receiving system,, relate in particular to the audio/video demodulation sign indicating number processing section that can reduce hardware complexity particularly based on the Television Reception Technology of PC.
Background technology
Along with popularizing of PC (Personal Computer, personal computer), see that by PC TV more and more accepted by consumers in general.At present, PC realizes that the mode of television reception has two kinds: a kind of is by built-in tv receiver card, the pci interface of general using system; Another kind is by external mobile TV receiver cabinet, the USB interface of general using system.Their reception principle is (is example with the pci interface) all as shown in Figure 1.
Described receiving card comprises a tuner, and it receives the high frequency multicarrier TV signal from antenna or coaxial cable, and will select the interior conversion of signals of reference carrier wave to a predetermined intermediate frequency carrier wave; If demodulator is used for receiving intermediate frequency signal, and this signal is carried out demodulation, thus output video CVBS (Composite Video Baseband Signal, composite video baseband signal) and audio frequency SIF (Sound IF, SIF sound intermediate frequency) analog signal; Television decoder, to described CVBS analog mixed-signal carry out synchronously, separation and Filtering Processing, picture signal process pci interface that produces or USB interface are sent to PC and play, and handle at the SIF voice signal, realize the conversion of various audios (such as monophony, stereo, Doby is handled or surround sound etc.), then or by pci interface or USB interface be sent to PC, or directly transport to the sound card terminals after converting analog signal to by plug-in audio digital to analog converter (DAC).
Therefore, existing tv receiver card is generally three chip solution, comprises high-frequency tuning (Tuner) chip, intermediate frequency demodulation (IFdemodulatot) chip and audio/video decoding (audio/video decoder) chip.And existing tuner generally partly is integrated into an individual module with the tuner of high-frequency tuning chip and intermediate frequency demodulation chip correspondence and if demodulator and is shielded.If built-in pci interface module in video decoding chip (as the Bt878/cx2388x chip of Conexant company, or the SAA7130/7133/7134/7135 chip of Phlips company) the receiving system volume can further be reduced.
Recently, also there is the tv receiver card of two chip solution to occur, for example Philips company is integrated into intermediate frequency demodulation chip, audio/video decoding chip and pci interface among the same chip SAA7131, just can form complete tv receiver card as long as add the high frequency tuning chip at front end like this.
Above-mentioned the deficiencies in the prior art part is: three chip solution are made real-time video decode with hardware mode, need the CVBS signal be exported with analog signaling in the intermediate frequency demodulation part of front end, converting it to digital signal by described video decode part again handles, signal at least will be through a digital-to-analogue conversion and one-off pattern number conversion like this, thereby is unfavorable for the raising of image definition.And, also can increase system cost undoubtedly if guarantee image definition with high-precision modulus or digital to analog converter.Though two chip solution can be saved described A/D and D/A converter,, be unfavorable for the reduction of system cost because integrated multicomponent and the device crossed cause silicon area big, thereby rate of finished products is low.
The summary of the invention the technical problem to be solved in the present invention is at above-mentioned the deficiencies in the prior art, and a kind of TV receiving method and device, audio/video demodulator and coding/decoding method based on PC proposed, can be when handling TV signal in real time and keeping image definition, reduce hardware complexity or dwindle the silicon chip gross area, thereby simplify hardware plan, minimizing product cost.
For solving the problems of the technologies described above, of the present inventionly be contemplated that substantially: the fast interface that utilizes PC, such as but not limited to PCI-express (computer peripheral equipment expansion interface standard, the highest bus speed that provides 2.5G bps), a large amount of CVBS complex digital signals behind the intermediate frequency demodulation are sent on the PC in real time, thereby utilize the CPU of PC main frame and video card resource to finish video decode work.Like this, propose a video demodulator that meets this design, just can design tv receiver card or receiving box that a hardware is extremely simplified.
First technical scheme that proposes in order to realize the present invention to conceive is, a kind of TV receiving method based on PC is provided, and comprises step:
A. to the tuning frequency-selecting of high frequency multicarrier TV signal, with the intermediate-freuqncy signal of the conversion of signals one-tenth in the selected reference carrier wave based on a predetermined intermediate frequency carrier wave from antenna or coaxial cable;
Especially, also comprise step:
B. the described intermediate-freuqncy signal of demodulation and produce the SIF voice data and CVBS composite video data;
The data flow that C. will comprise described SIF voice data and CVBS composite video data is sent to through predetermined high-speed interface
PC carries out software decode, obtains corresponding voice data and view data;
D. the video card of described PC is handled described view data to send the display demonstration, and sound card is handled described voice data to send loudspeaker plays.
In the such scheme, described step B comprises process: described intermediate-freuqncy signal is sampled, and successively after phase-locked loop circuit, residual sideband filter circuit and audio-video signal split circuit are handled, produce described SIF voice data and CVBS composite video data.
In the such scheme, step B comprises also described SIF voice data further is demodulated to voice data that among the step C, what described data flow comprised is this voice data and described video data like this.
Second technical scheme that proposes in order to realize the present invention to conceive is, a kind of radiovisor based on PC is provided, comprise tuner, be used for receiving high frequency multicarrier TV signal, and will select the intermediate-freuqncy signal of the interior conversion of signals one-tenth of reference carrier wave based on a predetermined intermediate frequency carrier wave from antenna or coaxial cable; Receive the if demodulator of described intermediate-freuqncy signal; Especially, also comprise a predetermined high-speed interface that is used for connecting PC, SIF voice data and past this high-speed interface of CVBS composite video data output that described if demodulator generates demodulation.
The 3rd technical scheme that proposes in order to realize the present invention to conceive is, a kind of audio/video demodulator is provided, comprises the ADC module, convert the single TV signal of intermediate frequency to digital signal, phase-locked loop circuit is moved base band to eliminate remaining carrier deviation with described digital signal; The VSB filter circuit changes into the double-side band real signal with described residual sideband complex signal; The audio-video signal split circuit is isolated independently SIF audio frequency and CVBS vision signal from described double-side band real signal; Especially, also comprise at least one predetermined high-speed interface that is used for connecting PC, receive the data flow that comprises voice data and composite video data; Described voice data and composite video data corresponding respectively described Voice ﹠ Video signal.
In the such scheme, described high-speed interface or PCI-express interface, or USB2.0 interface.
The 4th technical scheme that proposes in order to realize the present invention to conceive is, a kind of coding/decoding method is provided, and is used for PC processing video data stream, watches continuous image on the display in real time to be implemented in; Comprise step:
A. obtain the CVBS composite video data flow that transmits through high-speed interface;
B. go synchronous and the field system chronizing impulse detection;
C. effective capable signal being carried out luminance and chrominance information separates;
D. to the further demodulation of carrier chrominance signal and isolate the U/V component;
E. convert colourity U/V component format to the RGB component;
F. carry out deinterleaving to adjacent two and handle, to obtain complete two field picture;
G. two field picture is carried out proportional zoom, special effect treatment for demonstration.
Adopt above-mentioned each technical scheme, can simplify the hardware of radiovisor, reduce product cost; Receive TV based on PC, more help improving image definition and having the convenience that software upgrading is safeguarded concurrently.
Description of drawings
Fig. 1 is the television reception scheme schematic diagram of tradition based on PC
Fig. 2 is the television reception scheme schematic diagram that the present invention is based on PC
Fig. 3 is a Video Decoder internal frame diagram of the present invention
Fig. 4 is that PC of the present invention handles the television data stream signal schematic representation
Fig. 5 is that PC processing video data of the present invention flows through the journey schematic diagram
Embodiment
Below, the most preferred embodiment shown in is further set forth the present invention in conjunction with the accompanying drawings.
Fig. 2 is that the present invention is the TV receiving system schematic diagram of example with the PCI-express interface, can finish television reception and appreciation based on PC, and its signal processing comprises step:
A. to the tuning frequency-selecting of high frequency multicarrier TV signal, with the intermediate-freuqncy signal of the conversion of signals one-tenth in the selected reference carrier wave based on a predetermined intermediate frequency carrier wave from antenna or coaxial cable;
B. the described intermediate-freuqncy signal of demodulation and produce the SIF voice data and CVBS composite video data;
The data flow that C. will comprise described voice data and video data is sent to PC through predetermined high-speed interface and carries out software decode, obtains corresponding voice data and view data;
D. the video card of described PC is handled described view data to send the display demonstration, and sound card is handled described voice data to send loudspeaker plays.
Compared with prior art, step B and C can make modulus or the digital-to-analogue conversion number of times of receiving system minimizing to vision signal, thereby help the raising of image definition.And the high-speed interface among the step C can ensure the carrying out in real time of unimpeded and follow-up PC software decode of data flow, except using described PCI-express interface, the new high-speed interface specification that can also use USB2.0 interface (high energy 480M bps bus speed is provided) or occur in the future.Though at present the high energy of pci interface provides the bus speed of 133M byte per second, but under the framework of existing PC bandwidth sharing, therefore and be not suitable for the present invention the pairing actual transmission speed of external equipment is subjected to many-sided condition influence may be significantly less than this theoretical velocity.
Described SIF voice data further can also be demodulated to voice data among the described step B, in step C, what described data flow comprised is this voice data and described video data like this.
Data flow among the described step C can also comprise the data with audio or video signal correction, comprises the data of characterize audio signals form or the data of sign vision signal standard, like this can be so that PC holds the differentiating and processing to data.Such as, represent that with different data signal is pal mode, TSC-system formula or Sequential Color and Memory system formula.Certainly, these data are not essential yet, and the software of PC end also can increase by one section process of video data being carried out standard identification.
Therefore, present embodiment can also design a kind of mobile TV receiver cabinet or receiving card device based on PC according to said method, comprise tuner, be used for receiving high frequency multicarrier TV signal, and will select the intermediate-freuqncy signal of the interior conversion of signals one-tenth of reference carrier wave based on a predetermined intermediate frequency carrier wave; A predetermined high-speed interface that is used for connecting PC, and an if demodulator that receives described intermediate-freuqncy signal export SIF voice data and CVBS composite video data that demodulation generates toward this high-speed interface.Described radiovisor can adopt USB2.0 interface and corresponding splicing ear to make the receiving box of the external connection of PC, or adopt the PCI-express interface to make the receiving card of the built-in connection of PC, even can be integrated on the mainboard of PC by the high-speed interface circuit that comprises USB2.0 or PCI-express.
Can see that the hardware of described radiovisor is extremely simple, tuner can realize that therefore, its physical circuit figure needn't repeat to provide at this with existing tuning chip (for example TDA8275 of Philips company); Other hardware components present embodiment is realized with video demodulator shown in Figure 3.This video demodulator can be designed to ASIC (Application-SpecificIntegrated Circuit, special chip) form and connect with the hardware of simplifying receiving system.It comprises the ADC module, and the single TV signal of intermediate frequency of self-tuner converts digital signal in the future; Phase-locked loop (PLL) circuit is moved base band to eliminate remaining carrier deviation with described digital signal; VSB (residual sideband) filter circuit changes into the double-side band real signal with described residual sideband complex signal; The audio-video signal split circuit is isolated independently SIF audio frequency and CVBS vision signal from described double-side band real signal; And at least one predetermined high-speed interface that is used for connecting PC, receive the data flow that comprises voice data and composite video data; Described voice data and composite video data corresponding respectively described Voice ﹠ Video signal.Described each element circuit, comprise phase-locked loop circuit or residual sideband filter circuit, existing in the prior art multiple implementation, for example Mr. L.E.Franks in 1980 proposes to finish phase-locked loop circuit with Costas Loop in the article " carrier wave in the data communication and bit synchronization " of ieee communication journal; As for the design of VSB filter circuit, in " communication system: signal, system and application " (in August, 2004, San Diego State University published) of H ü seyin Mr. Abut work, introduction is arranged; ... do not enumerate one by one at this; But the video demodulator that comprises these element circuits is protected by the present invention.
Described video demodulator can also comprise gain control unit, receives the output of described ADC module, produces corresponding gain control signal according to the size of this output signal, keeps stable to be sent to the signal that described tuner receives video demodulator.The data sampling rate of described ADC module can be according to the occasion of concrete application, and for example the tuner intermediate frequency comes respective settings.For example, when the tuner intermediate frequency was decided to be 36MHz, this sample rate was (but being not limited to) 28.8Msps (Mega-Samples PerSecond, million per seconds); When described intermediate frequency is 44MHz, can select 35.2Msps.At described different sample rates, owing to adopt the software decode scheme at the PC end, system has favorable compatibility to guarantee image definition.
The video demodulator of present embodiment can also comprise an audio demodulation unit, be used for the further demodulation of SIF audio frequency of described audio-video signal split circuit output is generated voice data, this voice data can directly substitute described voice data and be sent to PC like this, and the data processing software of PC end is sent to sound card with these voice datas and does further audio processing.
The described intermediate-freuqncy signal of video demodulator demodulation shown in Figure 3 produces the process of voice data and CVBS composite video data, can also adopt other implementation, because of it belongs to prior art, so not at this detailed description.
The foregoing description can also comprise a frequency-selecting control unit based on mobile TV receiver cabinet or the receiving card device of PC, receives the index signal from remote controller, and the output corresponding control signal is controlled the selection of reference carrier wave toward described tuner.Described index signal can also be from described video demodulator chip, and this chip receives the control data that is produced by the operation of PC end subscriber by described high-speed interface.
Fig. 4 has illustrated the signal processing situation of PC of the present invention end.After the PC end detects high-speed interface connection and TV receiving apparatus, corresponding software module will be activated and receive the data flow that comprises voice data (or voice data) and composite video data, the data flow relevant with the composite video data is sent to the video decode module, as shown in Figure 5, on screen, show continuous image at last in real time; And the data flow relevant with voice data (or voice data) is sent to audio processing modules, can realize this Audio Processing process because of prior art has multiple mode, so do not give unnecessary details at this.
The coding/decoding method of Fig. 5 signal comprises step:
A. obtain the video data stream that transmits through high-speed interface;
B. go synchronous and the field system chronizing impulse detection;
C. effective capable signal being carried out luminance and chrominance information separates;
D. to the further demodulation of carrier chrominance signal and isolate the U/V component;
E. convert colourity U/V component format to the RGB component;
F. carry out deinterleaving to adjacent two and handle, to obtain complete two field picture;
G. two field picture is carried out proportional zoom, special effect treatment for demonstration.
Wherein, described high-speed interface can be the PCI-express interface, also can be the USB2.0 interface.DMA load mode with the PCI-express interface is an example, PC can determine video formats according to a data when receiving DMA buffer data piece for the first time, or in step B, carry out the identification judgement of video formats, thereby in subsequent step, carry out corresponding signal process according to standard according to lock-out pulse.Light tone among the described step C is separated and can be realized with the 3D with optimal separation effect (Dimension, dimension) comb filtering.The adverse effect that ADC module samples deviation is brought in the video demodulator can also comprise step between steps A and B
A1. carry out clock/sample-synchronous and handle, with the deviation of correcting sampling frequency and phase place.
The described coding/decoding method of sampling, the powerful calculating ability that can make full use of PC CPU (central processing unit) and GPU (graphic process unit) is carried out soft decoding, thereby reduces hardware cost.
Claims (13)
1. TV receiving method based on PC comprises step:
A. to the tuning frequency-selecting of high frequency multicarrier TV signal, with the intermediate-freuqncy signal of the conversion of signals one-tenth in the selected reference carrier wave based on a predetermined intermediate frequency carrier wave from antenna or coaxial cable;
It is characterized in that, also comprise step:
B. the described intermediate-freuqncy signal of demodulation and produce the SIF voice data and CVBS composite video data;
The data flow that C. will comprise described SIF voice data and CVBS composite video data is sent to PC through predetermined high-speed interface and carries out software decode, obtains corresponding voice data and view data;
D. the video card of described PC is handled described view data to send the display demonstration, and sound card is handled described voice data to send loudspeaker plays.
2. according to the described TV receiving method of claim 1, it is characterized in that based on PC:
Described step B comprises process: described intermediate-freuqncy signal is sampled, and successively after phase-locked loop circuit, residual sideband filter circuit and audio-video signal split circuit are handled, produce described SIF voice data and CVBS composite video data.
3. according to the described TV receiving method of claim 1, it is characterized in that based on PC:
Data flow described in the step C also comprises the data with audio or video signal correction, comprises the data of characterize audio signals form or the data of sign vision signal standard.
4. according to the described TV receiving method of claim 1, it is characterized in that based on PC:
Step B comprises also described SIF voice data further is demodulated to voice data that among the step C, what described data flow comprised is this voice data and described video data like this.
5. according to the described TV receiving method of claim 1, it is characterized in that based on PC:
Described high-speed interface among the step C or PCI-express interface, or USB2.0 interface.
6. the radiovisor based on PC comprises tuner, is used for receiving the high frequency multicarrier TV signal from antenna or coaxial cable, and will select the intermediate-freuqncy signal of the interior conversion of signals one-tenth of reference carrier wave based on a predetermined intermediate frequency carrier wave; Receive the if demodulator of described intermediate-freuqncy signal; It is characterized in that:
Also comprise a predetermined high-speed interface that is used for connecting PC, SIF voice data and past this high-speed interface of CVBS composite video data output that described if demodulator generates demodulation.
7. according to the described radiovisor of claim 6, it is characterized in that based on PC:
Also comprise a frequency-selecting control unit, receive from remote controller or from the index signal of described high-speed interface, the output corresponding control signal is controlled the selection of reference carrier wave toward described tuner.
8. an audio/video demodulator comprises the ADC module, converts the single TV signal of intermediate frequency to digital signal, and phase-locked loop circuit is moved base band to eliminate remaining carrier deviation with described digital signal; The VSB filter circuit changes into the double-side band real signal with described residual sideband complex signal; The audio-video signal split circuit is isolated independently SIF audio frequency and CVBS vision signal from described double-side band real signal; It is characterized in that:
Also comprise at least one predetermined high-speed interface that is used for connecting PC, receive the data flow that comprises voice data and composite video data; Described voice data and composite video data corresponding respectively described Voice ﹠ Video signal.
9. described according to Claim 8 audio/video demodulator is characterized in that:
Described high-speed interface or PCI-express interface, or USB2.0 interface.
10. described according to Claim 8 audio/video demodulator is characterized in that:
Also comprise gain control unit, receive the output of described ADC module, produce corresponding gain control signal according to the size of this output signal.
11. described according to Claim 8 audio/video demodulator is characterized in that:
This video demodulator exists in the ASIC mode.
12. a coding/decoding method is used for PC processing video data stream, watches continuous image on the display in real time to be implemented in; It is characterized in that, comprise step:
A. obtain the CVBS composite video data flow that transmits through high-speed interface;
B. go synchronous and the field system chronizing impulse detection;
C. effective capable signal being carried out luminance and chrominance information separates;
D. to the further demodulation of carrier chrominance signal and isolate the U/V component;
E. convert colourity U/V component format to the RGB component;
F. carry out deinterleaving to adjacent two and handle, to obtain complete two field picture;
G. two field picture is carried out proportional zoom, special effect treatment for demonstration.
13. coding/decoding method according to claim 12 is characterized in that, also comprises step between steps A and B:
A1. carry out clock/sample-synchronous and handle, with the deviation of correcting sampling frequency and phase place.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101006985A CN100556090C (en) | 2005-10-21 | 2005-10-21 | TV receiving method and device, audio/video demodulator and coding/decoding method based on PC |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101006985A CN100556090C (en) | 2005-10-21 | 2005-10-21 | TV receiving method and device, audio/video demodulator and coding/decoding method based on PC |
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| CN1953518A CN1953518A (en) | 2007-04-25 |
| CN100556090C true CN100556090C (en) | 2009-10-28 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100592765C (en) * | 2007-05-30 | 2010-02-24 | 图诚科技股份有限公司 | Extension device with television video input and output function |
| CN101998076B (en) * | 2009-08-28 | 2012-10-31 | 承景科技股份有限公司 | Video standard detector and operation method thereof, and intermediate frequency demodulator |
| CN102387327B (en) * | 2010-08-30 | 2016-01-20 | 深圳艾科创新微电子有限公司 | A kind of vision signal standard detection method and device |
| CN102740016B (en) * | 2011-04-15 | 2015-10-21 | 国基电子（上海）有限公司 | Detect the video-unit of video format |
| US9743091B2 (en) * | 2012-12-17 | 2017-08-22 | Lg Electronics Inc. | Method for encoding/decoding image, and device using same |
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