CN202475623U - Ultraminiature satellite television tuner for digital/analog all-in-one machine - Google Patents
Ultraminiature satellite television tuner for digital/analog all-in-one machine Download PDFInfo
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- CN202475623U CN202475623U CN2012201240437U CN201220124043U CN202475623U CN 202475623 U CN202475623 U CN 202475623U CN 2012201240437 U CN2012201240437 U CN 2012201240437U CN 201220124043 U CN201220124043 U CN 201220124043U CN 202475623 U CN202475623 U CN 202475623U
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Abstract
The utility model discloses an ultraminiature satellite television tuner for a digital/analog all-in-one machine, which can be used for receiving and processing analog and digital satellite television radio-frequency signals. The ultraminiature satellite television tuner comprises a radio-frequency input port, a radio-frequency preprocessing module, a digital zero intermediate frequency processing module, a radio-frequency allocation module, an analog down-conversion processing module and an analog frequency demodulating module; the radio-frequency allocation module is used for receiving signals output by the radio-frequency processing module and dividing the signals into two paths and outputting the two paths of signals, wherein the first path of signals is input into the analog down-conversion processing module; the analog down-conversion processing module selects the analog satellite television radio-frequency signals with frequencies required by the digital/analog all-in-one machine and converting the analog satellite television radio-frequency signals into intermediate-frequency signals; the analog frequency demodulating module is used for demodulating the intermediate-frequency signals into audio/video combined baseband signals and outputting the audio/video combined baseband signals; and the second path of signals is input into the digital zero intermediate frequency processing module, and the digital zero intermediate frequency processing module selects digital satellite television radio-frequency signals with frequencies needed by the digital/analog all-in-one machine, converting the digital satellite television radio-frequency signals into available I/Q (In-phase/Quadrature) signals of the digital/analog all-in-one machine and outputting the I/Q signals.
Description
Technical field
The utility model relates to a kind of satellite television tuner, specifically a kind of subminiature D/A all-in-one satellite television tuner.
Background technology
The basic function of digital satellite television receiving system is that can to receive operating frequency that the satellite antenna frequency demultiplier transmits be that the TV signal of 950MHz-2150MHz is imported in the tuner through feeder line; Tuner is controlled by receiver; From the signal in this broadband, select an individual passage; Through processing such as amplification, frequency conversion and demodulation, the motherboard of sending into again in the STB carries out the Voice & Video processing, and final output audio and vision signal are used for miscellaneous equipment.
Along with the development constantly of technology, traditional bulky digital satellite television STB is replaced by the little digital satellite television STB of volume gradually.The volume of digital satellite television STB is little by little done more small-sized and more small-sized, and this is because the little one side of volume can accomplish to reduce production costs, on the other hand also can be through doing attractive in appearance carefully, and receiving gets more and more is liked by the people.But the volume-diminished of digital satellite television STB; Require the tuner in the digital satellite STB also will and then diminish; Tuner dwindles, but it is just many more to overcome technical barrier, particularly with domestic now actual conditions; Be still analog satellite TV signal output on the satellite television programming significant proportion with the DBS standard; And before existing analog satellite TV frequency variator and the digital satellite television receiving system and incompatible, be badly in need of on the market a kind ofly meeting the frequency modulator that the client can watch the requirement of D/A satellite television programming simultaneously, but but the microminiature and the tuner of compatible with digital and analog satellite television reception simultaneously do not appear also on the market.
It is thus clear that; But the tuner of at present developing a kind of microminiature and while compatible with digital and analog satellite television reception is that very strong competitiveness is arranged on market, and the microminiature numeral is the very big convenience of client that can offer the exploitation and the manufacturing of satellite television STB with the compatible satellite television tuner of simulation.
The utility model content
The purpose of the utility model provides a kind of subminiature D/A all-in-one satellite television tuner, can realize that the reception of analog-and digital-satellite television radiofrequency signal is handled.
The purpose of the utility model realizes through following technical measures:
A kind of subminiature D/A all-in-one satellite television tuner; Comprise the rf inputs mouth that is used to import D/A satellite television radiofrequency signal; Be used for the D/A satellite television radiofrequency signal of input is carried out the radio frequency pretreatment module of filtering and high frequency processing and amplifying; Digital zero IF process module, radio frequency distribution module, analog down processing module and analog frequency demodulation module; Said radio frequency distribution module receives the signal of said radio frequency pretreatment module output and is divided into two-way output; The first via is imported said analog down processing module; The analog satellite TV RF signals frequency conversion that said analog down processing module is chosen the required frequency of said D/A all-in-one is an intermediate-freuqncy signal, and said analog frequency demodulation module is demodulated into the compound baseband signal output of audio/video with said intermediate-freuqncy signal; The second the tunnel imports said digital zero IF process module, and said digital zero IF process module is chosen the digital satellite television radiofrequency signal of the required frequency of said D/A all-in-one, and frequency conversion is the i/q signal output that said D/A all-in-one can be used.
In order to improve the receiving sensitivity of this tuner to analog radio-frequency signal, described tuner also comprises the analog radio frequency gain control module; Said analog radio frequency gain control module is under the control of said analog frequency demodulation module; After the first via signal of said radio frequency distribution module output carried out radio frequency automatic gain control and treatment and secondary high frequency processing and amplifying, be input to said analog down processing module.
For the noise of the analog radio-frequency signal that reduces this tuner disturbs, described tuner also comprises the analog radio frequency filtration module that is used to carry out the analog radio-frequency signal Filtering Processing; Said analog radio frequency filtration module is connected between the input of output and analog radio frequency gain control module of said radio frequency distribution module.
Compared with prior art, the utlity model has following beneficial effect:
The tuner of the utility model has adopted analog down processing module and digital zero IF process module respectively analog satellite TV RF signals and digital satellite television radiofrequency signal to be received processing; And utilize the radio frequency automatic gain control to guarantee receiving sensitivity and signal strength signal intensity to the D/A satellite TV signal; Fully taken into account the resource of STB back-end host plate simultaneously; Utilize the analog frequency demodulation module to carry out the baseband signal output that the signal demodulation realizes that audio/video is compound to the analog satellite TV RF signals; And the digital satellite television radiofrequency signal is only exported the i/q signal that the D/A all-in-one can be used through digital zero IF process resume module; Demodulation process is transferred to the back-end host plate carries out; Make full use of the resource of STB back-end host plate, made that the tuner overall volume microminiature and the power consumption of the utility model are little, and can realize output of DBS fundamental frequency and the output of DVB-S/S2 zero intermediate frequency.
Description of drawings
Below in conjunction with accompanying drawing and specific embodiment the utility model is done further to specify:
Fig. 1 is the schematic block circuit diagram of the utility model;
Fig. 2 is the signal processing flow figure of the utility model.
Embodiment
As shown in Figure 1; The subminiature D/A all-in-one satellite television tuner of the utility model; Comprise the rf inputs mouth that is used to import D/A satellite television radiofrequency signal, be used for the D/A satellite television radiofrequency signal of input is carried out the radio frequency pretreatment module of filtering and high frequency processing and amplifying, digital zero IF process module; The radio frequency distribution module, analog down processing module and analog frequency demodulation module; The signal of radio frequency distribution module received RF pretreatment module output also is divided into two-way output; First via input analog down processing module; The analog satellite TV RF signals frequency conversion that the analog down processing module is chosen the required frequency of D/A all-in-one is an intermediate-freuqncy signal; Be the radiofrequency signal of 479.5MHz, the analog frequency demodulation module is demodulated into the compound baseband signal output of audio/video with intermediate-freuqncy signal; The second tunnel input digit zero intermediate frequency processing module, digital zero IF process module is chosen the digital satellite television radiofrequency signal of the required frequency of D/A all-in-one, the i/q signal output that frequency conversion can be used for the D/A all-in-one.
In order to improve the receiving sensitivity of this tuner to analog radio-frequency signal, the D/A all-in-one satellite television tuner of the utility model also comprises the analog radio frequency gain control module; Said analog radio frequency gain control module is under the control of said analog frequency demodulation module; After the first via signal of said radio frequency distribution module output carried out radio frequency automatic gain control and treatment and secondary high frequency processing and amplifying, be input to said analog down processing module.
For the noise of the analog radio-frequency signal that reduces this tuner disturbs, the D/A all-in-one satellite television tuner of the utility model also comprises the analog radio frequency filtration module that is used to carry out the analog radio-frequency signal Filtering Processing; Said analog radio frequency filtration module is connected between the input of output and analog radio frequency gain control module of said radio frequency distribution module.
Wherein, The radio frequency pretreatment module of the utility model comprises filter circuit and low noise high-frequency triode; This filter circuit be in the prior art by inductance, the filter circuit that electric capacity and resistance are formed, the digital satellite television radiofrequency signal of input tuner is carried out signal filtering through this filter circuit and is handled; Carry out high frequency through this low noise high-frequency triode again and amplify back output, realize the signal filtering and the high frequency processing and amplifying function of radio frequency pretreatment module with this.The radio frequency distribution module adopts rlc circuit to realize that inductance L wherein can adopt the little charged sense that directly is plotted on the PCB circuit board.
It is the main chip of the zero intermediate frequency IC that integrated level is high, performance is good of DS1101 as the zero intermediate frequency processing module that the zero intermediate frequency processing module of the utility model adopts model; This chip has comprised rf gain control input end, zero intermediate frequency gain control input, zero intermediate frequency signals output, zero intermediate frequency amplification module, serial clock input, serial data input; It has and input signal is carried out radio frequency amplifies; Through mixing, filtering and amplification, the function of the i/q signal that conversion output SD signal demodulation module or high-definition signal demodulation module can be used.
The analog radio frequency gain control module of the utility model comprises attenuator ATT and analog radio frequency amplifier; Attenuator ATT carries out AGC automatic gain control and treatment, the radiofrequency signal of handling through analog filtering is decayed by the control of analog frequency demodulation module, by the analog radio frequency amplifier radiofrequency signal is carried out secondary again and amplifies.
The analog down processing module of the utility model comprises analog radio frequency double tunning channel frequency-selecting unit, RF local oscillator unit, analog radio frequency smear amplifying unit, intermediate-frequency bandwidth selected cell and intermediate frequency amplifying unit; The RF local oscillator unit adds by model to be that the phase-locked loop circuit PLL that the chip of SP5055 is formed forms by one group of triode and R, L, C circuit, and surge frequency range is a RF incoming frequency scope, and promptly 950～2150MHz adds 479.5MHz.Radio frequency analog signal is after secondary amplification and AGC automatic gain control and treatment; Again through one group of radio frequency double tunning channel selection unit that is used to suppress mirror image and the other wavestrip of filtering; Controlled by phase-locked loop circuit PLL simultaneously, radiofrequency signal afterwards enters the input of smear amplifying circuit again.Analog radio frequency smear amplifying unit is made up of one group of triode and R, L, C circuit, by producing intermediate-freuqncy signal 479.5MHz after analog radio frequency incoming frequency and the RF local oscillator frequency smear.The intermediate-frequency bandwidth selected cell is made up of an I/O mouth circuit of two diodes and PLL Phase Lock Loop IC, and can select is 27MHz or the intermediate-frequency bandwidth of 18MHz.Because intermediate-freuqncy signal need pass through the loss that the SAW filter can cause intermediate-freuqncy signal, thus intermediate-frequency filter preceding/after need respectively add one group of intermediate frequency amplifier, i.e. intermediate frequency amplifying unit, it is made up of triode and R, L, C circuit.
The analog frequency demodulation module of the utility model, i.e. FM demodulation module employing model is the main chip of the high sensitivity demodulation chip of SL1461 as the analog frequency demodulation module.Behind amplification of analog if signal process and the filter circuit, signal enters the FM demodulation module and handles, and intermediate-freuqncy signal is demodulated into the fundamental frequency signal Base Band of sound and image mixing.
In actual use; The utility model work that matches with the back-end host plate of STB; In order to help better to understand the operation principle of the subminiature D/A all-in-one of the utility model satellite television tuner, below tuner and the connected mode of STB of simple declaration the utility model:
Analog frequency demodulation module in the utility model cooperates with the simulation video/audio amplification module of master controller in the back-end host plate, and the baseband signal of analog frequency demodulation module output is carried out the video amplification through simulation video/audio amplification module can realize the reception of STB to the analog satellite TV programme with acoustic processing; Digital high-definition/SD signal demodulation module that digital zero IF process module in the utility model cooperates the back-end host board chip to include; It is the DVB-S/S2 demodulation module; Be provided with automative interest increasing controlling circuit between digital zero IF process module and the DVB-S/S2 demodulation module; The radio frequency pretreatment module adopts the low noise high-frequency triode to realize that high frequency amplifies; The i/q signal output port of digital zero IF process module connects the i/q signal input port of DVB-S/S2 demodulation module, and the automatic gain control input end mouth of digital zero IF process module connects the automatic gain control output end mouth of DVB-S/S2 demodulation module, the I of zero intermediate frequency processing module
2The C bus port connects DVB-S/S2 demodulation module I
2The C bus port, the i/q signal of digital zero IF process module output carries out the DVB-S/S2 demodulation through the DVB-S/S2 demodulation module, and the digital decoding module that is input in the master controller decodes, and has promptly realized the reception of STB to digital satellite television programming.
As shown in Figure 2, the utility model all is to pass through I by the master board of level behind the STB to the digital satellite program reception of DBS analog satellite program and DVB-S/S2
2The total line traffic control of C; Its process is following: behind master board and this microminiature D/A satellite tuner electrification reset; People by TV reception sends control command through man-machine interface to main control computer; Select earlier to select corresponding program receiving source again behind the simulation or the main menu of numeral, do corresponding program searching, the utility model to the concrete signal handling process of the radiofrequency signal of input is in this process:
(1) the analog satellite TV signal is from the rf inputs mouth input of this tuner; Through the radio frequency pretreatment module; This module is carried out filtering effectively and amplification to the analog satellite TV RF signals; The radiofrequency signal of amplifying back output is linked into the down-converted module through once simulating after being linked into analog radio frequency automatic gain control (ATT) and amplifying circuit again behind the rf filtering circuit more again; This down conversion module comprises double tunning channel selection circuit, radio frequency mixed circuit, RF local oscillator circuit OSC, phase-locked loop circuit PLL, two-stage IF amplifier circuit, intermediate-frequency filter SAW Filter, intermediate-frequency bandwidth control circuit IF SW; Reenter simulation FM demodulation module through output intermediate-freuqncy signal after these processing of circuit; This modular circuit mainly is made up of IC SL1461, comprises a demodulation basis local oscillator VCO and intermediate frequency model intensity detecting circuit, produces different direct voltages after the strong and weak signals detection and feeds back to the rf gain control circuit and form automatic gain control circuit.Intermediate-freuqncy signal reenters the analog video amplifying circuit and the sound treatment circuit of master controller after the compound audio/video baseband signal of output behind the simulation FM demodulation module.The I of while phase-locked loop pll
2C is operatively connected to master controller I
2The total line traffic control of C.
(2) the digital satellite television signal is from the rf inputs mouth input of this tuner, and through the radio frequency pretreatment module, this module is carried out filtering effectively and amplification to the digital satellite television radiofrequency signal; The radiofrequency signal of amplifying back output is connected to the zero intermediate frequency processing module; In this module, radiofrequency signal is carried out radio frequency once more and is amplified, through mixing, filtering and amplification; Output can be exchanged into the available i/q signal of DVB-S/S2 demodulation module, is input to the DVB-S/S2 demodulation module that the motherboard chip includes again.DVB-S/S2 demodulation module that the motherboard chip includes and the interface between the master controller comprise serial/parallel line data stream, data flow clock, synchronizing signal and miscue signal and I
2C bus and reset terminal.The automatic gain control port of demodulation module IC is connected with the gain controlling port of zero intermediate frequency IC, forms feedback network, realizes automatic gain control.Demodulation module IC can be demodulated into available i/q signal data flow output, and then data flow output is connected to the decoder module that master controller includes and decodes, and through master controller Voice & Video is handled again, is connected to the Voice & Video output port at last.Master board can be passed through I
2The total line traffic control demodulation module of C, and by the I of demodulation module
2C bus and the selection from radiofrequency signal of zero intermediate frequency processing module need the frequency of demodulation, reach the effect of arbitrarily watching different frequency.
The execution mode of the utility model is not limited thereto; According to foregoing; Ordinary skill knowledge and customary means according to this area; Do not breaking away under the above-mentioned basic fundamental thought of the utility model prerequisite, equivalent modifications, replacement or change that the utility model can also be made other various ways all can realize the utility model purpose.
Claims (3)
1. subminiature D/A all-in-one satellite television tuner; Comprise the rf inputs mouth that is used to import D/A satellite television radiofrequency signal; Be used for the D/A satellite television radiofrequency signal of input is carried out the radio frequency pretreatment module of filtering and high frequency processing and amplifying; With digital zero IF process module, it is characterized in that: described tuner also comprises radio frequency distribution module, analog down processing module and analog frequency demodulation module; Said radio frequency distribution module receives the signal of said radio frequency pretreatment module output and is divided into two-way output; The first via is imported said analog down processing module; The analog satellite TV RF signals frequency conversion that said analog down processing module is chosen the required frequency of said D/A all-in-one is an intermediate-freuqncy signal, and said analog frequency demodulation module is demodulated into the compound baseband signal output of audio/video with said intermediate-freuqncy signal; The second the tunnel imports said digital zero IF process module, and said digital zero IF process module is chosen the digital satellite television radiofrequency signal of the required frequency of said D/A all-in-one, and frequency conversion is the i/q signal output that said D/A all-in-one can be used.
2. subminiature D/A all-in-one satellite television tuner according to claim 1, it is characterized in that: described tuner also comprises the analog radio frequency gain control module; Said analog radio frequency gain control module is under the control of said analog frequency demodulation module; After the first via signal of said radio frequency distribution module output carried out radio frequency automatic gain control and treatment and secondary high frequency processing and amplifying, be input to said analog down processing module.
3. subminiature D/A all-in-one satellite television tuner according to claim 2, it is characterized in that: described tuner also comprises the analog radio frequency filtration module that is used to carry out the analog radio-frequency signal Filtering Processing; Said analog radio frequency filtration module is connected between the input of output and analog radio frequency gain control module of said radio frequency distribution module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201240437U CN202475623U (en) | 2012-03-28 | 2012-03-28 | Ultraminiature satellite television tuner for digital/analog all-in-one machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201240437U CN202475623U (en) | 2012-03-28 | 2012-03-28 | Ultraminiature satellite television tuner for digital/analog all-in-one machine |
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| Publication Number | Publication Date |
|---|---|
| CN202475623U true CN202475623U (en) | 2012-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201240437U Expired - Lifetime CN202475623U (en) | 2012-03-28 | 2012-03-28 | Ultraminiature satellite television tuner for digital/analog all-in-one machine |
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| Country | Link |
|---|---|
| CN (1) | CN202475623U (en) |
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2012
- 2012-03-28 CN CN2012201240437U patent/CN202475623U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 511455 Guangdong city of Guangzhou province Nansha District Huangge Town Ji Sheng Lu No. 2 (plant A) Patentee after: Guangzhou Yi Da Polytron Technologies Inc Address before: 511442 Guangdong Province, Guangzhou City Southern towns Panyu District Po Village Road No. 8 2 Dengyun building 401, 501 Patentee before: Guangzhou Earda Electronic Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20121003 |
|
| CX01 | Expiry of patent term |