CN102638676B - Simulated satellite TV signal generator - Google Patents
Simulated satellite TV signal generator Download PDFInfo
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- CN102638676B CN102638676B CN201210087482.XA CN201210087482A CN102638676B CN 102638676 B CN102638676 B CN 102638676B CN 201210087482 A CN201210087482 A CN 201210087482A CN 102638676 B CN102638676 B CN 102638676B
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Abstract
The invention discloses a simulated satellite TV signal generator, which comprises at least one up-conversion module, a general control module, a noise module and a noise superposition circuit, wherein the up-conversion module is used for simulating satellite TV signal modulation; the general control module is used for controlling operating frequency of each up-conversion module; the noise module is used for generating radio-frequency white noise; the noise superposition circuit is used for superposing the radio-frequency white noise to a radio frequency signal; the output end of the general control module is connected to the control ends of the up-conversion modules respectively; the general control module controls the up-conversion modules to perform simulated satellite TV signal modulation on the received intermediate frequency signals and video signals in the original accompanying sound according to the set operating frequency; and the up-conversion modules output audio/video radio frequency signals which serve as the simulated satellite TV signals. By the generator, the functions of generating audio/video signals, outputting multiple frequency points and superposing the noise signals are integrated, and the simulated satellite TV signal which meets the production test requirements of a set top box and a tuner of a simulated satellite TV can be provided.
Description
Technical field
The present invention relates to a kind of signal generator, specifically a kind of analog satellite television signal generator.
Background technology
Analog satellite TV signal, is in fact exactly original audio frequency, vision signal to be modulated to the frequency range of satellite television radiofrequency signal, and 950MHz is to the radiofrequency signal in this frequency range of 2150MHz.Satellite television subscribers receives by analog satellite TV set-top box the analog satellite TV signal that satellite launch gets off at home, and be finally demodulated into the readable audio frequency of television set through the processing of tuner, vision signal, so manufacturer of analog satellite TV set-top box and tuner, when producing and research and develop, need to receive the radiofrequency signal in this frequency range, then demodulate audio frequency, vision signal, so that detect and debug machine top box and tuner performance, the generator that is provided for the satellite television radiofrequency signal of detection debugging in this process must meet detection comprehensively and debug required, otherwise the production quality of Set Top Box and tuner will be had a strong impact on.
At present, the appliance requires of the type is outside on the market inputs audio frequency, vision signal, and only has a road radiofrequency signal output, there is no noise stack, while being therefore not suitable for production test, uses.
Summary of the invention
The object of this invention is to provide a kind of analog satellite television signal generator, the analog satellite TV signal that meets analog satellite TV set-top box and tuner production test requirement can be provided.
The object of the invention is to realize by following technical measures:
A kind of analog satellite television signal generator, comprise the up-converter module for the modulation of analog satellite TV signal, it is characterized in that described signal generator comprises that at least one is for the up-converter module of analog satellite TV signal modulation, for original accompanying sound intermediate frequency signal and vision signal equalization are distributed to the audio frequency and video distribution module of exporting, for controlling the described operating frequency setting of each up-converter module and the complete machine control module of display simulation satellite TV signal generator operating state, the output of described audio frequency and video distribution module is connected respectively to the input of described each up-converter module, the output of described complete machine control module is connected respectively to the control end of described each up-converter module, described complete machine control module is controlled described each up-converter module respectively by the signal receiving from described audio frequency and video distribution module, by set operating frequency, carry out the modulation of analog satellite TV signal, described each up-converter module output is as the audio frequency and video radiofrequency signal of analog satellite TV signal.
For the signal existing in the practical application of energy analogue simulation satellite TV signal disturbs, described signal generator also comprises for generation of the noise module of radio frequency white noise and the noise laminating module for radio frequency white noise is added in radiofrequency signal, the output of described each up-converter module and noise module is connected respectively to the input of described noise laminating module, the audio frequency and video radiofrequency signal of described each up-converter module output is superimposed by the radio frequency white noise of described noise laminating module and the output of described noise module respectively, described noise laminating module output is for the analog satellite TV signal of analog satellite TV set-top box and tuner production test.
The inconvenience that needs outside input audio frequency, vision signal to bring in order to exempt existing signal generator, described analog satellite television signal generator also comprises for generation of the vision signal generation module of raw video signal with for generation of the audio signal generation module of original accompanying sound intermediate frequency signal; The output of described vision signal generation module and audio signal generation module is connected respectively to the input of described audio frequency and video distribution module.
As one embodiment of the present invention, described vision signal generation module comprises for exporting the microcontroller of RGB color difference signal and H/V synchronizing signal, and the video coding chip for becoming raw video signal to export the Signal coding of described microcontroller output; The input of described video coding chip is connected to the corresponding interface of described microcontroller, and output is connected to the input of described audio frequency and video distribution module.
As one embodiment of the present invention, described audio signal generation module comprises the audio frequency sine-wave oscillator for generation of original audio signal, and for the signal of described frequency sine-wave oscillator output being modulated into the intermediate frequency modulator of original accompanying sound intermediate frequency signal output; The input of described intermediate frequency modulator is connected to the output of described audio frequency sine-wave oscillator, and output is connected to the input of described audio frequency and video distribution module.
As one embodiment of the present invention, described each up-converter module includes preemphasis circuit, VCO oscillator, radio frequency amplifier, adjustable attenuator and phase-locked loop circuit, described preemphasis circuit, VCO oscillator, radio frequency amplifier is sequentially connected with adjustable attenuator, the output of described phase-locked loop circuit is connected to the control end of described VCO oscillator, the input of described phase-locked loop circuit is the control end of described up-converter module, be connected to the output of described complete machine control module, the input of described preemphasis circuit is the input of described up-converter module, be connected to the output of described audio frequency and video distribution module, the output of described adjustable attenuator is the output of described up-converter module, be connected to the input of described noise laminating module, described preemphasis circuit receives impartial original accompanying sound intermediate frequency signal and the vision signal of distributing output of described up-converter module, by described VCO oscillator, carry out up-conversion modulation successively, radio frequency amplifier carries out signal amplification and adjustable attenuator carries out signal strength signal intensity adjusting, and by described phase-locked loop circuit, controlled the frequency of oscillation of described VCO oscillator, described adjustable attenuator is exported described audio frequency and video radiofrequency signal.
As one embodiment of the present invention, described complete machine control module comprises microprocessor, display panels and key panel; The output of the control end of described each up-converter module, the input of display panels and key panel is connected to respectively the corresponding interface of described microprocessor by data/address bus.
In order to meet the actual needs in analog satellite TV set-top box and tuner production test, the quantity of described up-converter module is eight.
Than prior art, analog satellite television signal generator tool of the present invention has the following advantages:
(1) meet analog satellite TV set-top box and tuner production test requirement
Analog satellite television signal generator of the present invention, adopted the up-converter module of multichannel to modulate original audio-video signal, the audio frequency and video radiofrequency signal of output multi-channel, and using audio frequency and video radiofrequency signal production test for analog satellite TV set-top box and tuner as analog satellite TV signal of this multichannel, and the quantity of these multiple signals can be adjusted according to testing requirement, the present invention can simulate the actual conditions in production practices to the full extent, be that satellite television Set Top Box and tuner face and accept the not situation of the multi-channel rf signal of determined number simultaneously.Meanwhile, the present invention can also pass through noise module and noise supercircuit, and the stack of radio frequency white noise, as in the audio frequency and video radiofrequency signal of generator output, has been simulated to the signal being subject to while accepting satellite television radiofrequency signal in practical application and disturbed.
(2) have multi-channel rf, output frequency can free setting and stable
Each up-converter module in the present invention is subject to complete machine control module, can to the operating frequency of each up-converter module, arrange by complete machine control module, realize multi-channel rf signal with different frequency output, the present invention can simulate the situation of the radiofrequency signal signal frequency fluctuation of accepting in practical application, the frequency of Qie Ge road radiofrequency signal arranges separately, and output frequency is stable.
(3) build-in function is many, practical
Analog satellite television signal generator of the present invention, also integrated audio and video frequency signal generation module, make analog satellite television signal generator of the present invention can break away from the restriction of original audio frequency and video input signal cable, in production test place, arbitrarily move, and there is very strong portability, while being very applicable to production test, use.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is the schematic block circuit diagram of analog satellite television signal generator of the present invention;
Fig. 2 is the schematic block circuit diagram of vision signal generation module in the present invention;
Fig. 3 is the schematic block circuit diagram of up-converter module in the present invention.
Embodiment
As shown in Figure 1, analog satellite television signal generator of the present invention, comprise that at least one is for the up-converter module of analog satellite TV signal modulation, for controlling the described operating frequency setting of each up-converter module and the complete machine control module of display simulation satellite TV signal generator operating state, the output of described complete machine control module is connected respectively to the control end of described each up-converter module, described complete machine control module is controlled described each up-converter module respectively by the original accompanying sound intermediate frequency signal and the vision signal that receive, by set operating frequency, carry out the modulation of analog satellite TV signal, described each up-converter module output is as the audio frequency and video radiofrequency signal of analog satellite TV signal, be frequency at 950MHz to the radiofrequency signal between 2150MHz.
For the signal existing in the practical application of energy analogue simulation satellite TV signal disturbs, this analog satellite television signal generator also comprises for generation of the noise module of radio frequency white noise and the noise supercircuit for radio frequency white noise is added in radiofrequency signal, wherein, noise module is optional to be the noise source of HP 346A and to export by amplifying circuit by model, realize the generation of radio frequency white noise, noise supercircuit is mainly comprised of transmission transformer and impedance matching network, the composition of noise module and noise supercircuit connects and the annexation between them all can be selected existing circuit engineering, do not repeat them here, the output of each up-converter module and noise module is connected respectively to the input of noise supercircuit, the audio frequency and video radiofrequency signal of each up-converter module output is superimposed by the radio frequency white noise of noise supercircuit and the output of noise module respectively, noise supercircuit is exported the analog satellite TV signal of the multifrequency point of the noise that superposeed, and this is the analog satellite TV signal for analog satellite TV set-top box and tuner production test.
The inconvenience that needs outside input audio frequency, vision signal to bring in order to exempt existing signal generator, this analog satellite television signal generator also comprises for generation of the vision signal generation module of raw video signal with for generation of the audio signal generation module of original accompanying sound intermediate frequency signal; The output of vision signal generation module and audio signal generation module is connected respectively to the input of audio frequency and video distribution module.
When analog satellite television signal generator work of the present invention, vision signal generation module and audio signal generation module produce raw video signal and original accompanying sound intermediate frequency signal, and deliver to the input of audio frequency and video distribution module, audio frequency and video distribution module is assigned to each up-converter module modulation by raw video signal and original accompanying sound intermediate frequency signal, the radio frequency white noise that the radiofrequency signal of each up-converter module output and noise module produce is sent into noise laminating module, the analog satellite TV signal of last output multi-channel.Frequency output, the liquid crystal panel that complete machine control module is controlled each up-converter module shows, key panel operation.
Wherein, as shown in Figure 2, above-mentioned vision signal generation module comprises for exporting the microcontroller of RGB color difference signal and H/V synchronizing signal, and the video coding chip for becoming raw video signal to export the Signal coding of microcontroller output; Wherein, it is the control IC of STM8S103 that this microcontroller can be selected model, it is the Video coding IC of AD724 that video coding chip can be selected model, and the input of video coding chip is connected to the corresponding interface of microcontroller, and output is connected to the input of audio frequency and video distribution module.By carry out software programming control on microcontroller, the RGB color difference signal of microcontroller output and H/V synchronizing signal, after video coding chip coding, can be exported raw video signal.
Above-mentioned audio signal generation module comprises the audio frequency sine-wave oscillator for generation of original audio signal, and for the signal of frequency sine-wave oscillator output being modulated into the modulation circuit of intermediate frequency of original accompanying sound intermediate frequency signal output; Wherein, it is the IC of ICL8038 that this audio frequency sine-wave oscillator can be selected model, modulation circuit of intermediate frequency can adopt the circuit structure form adapting with this audio frequency sine-wave oscillator IC in prior art, the input of intermediate frequency modulator is connected to the output of audio frequency sine-wave oscillator, and output is connected to the input of audio frequency and video distribution module.
Above-mentioned complete machine control module comprises microprocessor, display panels and key panel; Wherein, it is the control IC of AT89S52 that this microprocessor can be selected model, and the output of the control end of each up-converter module, the input of display panels and key panel is connected to respectively the corresponding interface of microprocessor by data/address bus.
As shown in Figure 3, above-mentioned each up-converter module includes phase-locked loop circuit, VCO oscillator, modulation circuit and radio frequency amplifier, wherein, it is the chip realization of SP5055 that phase-locked loop circuit can be selected model, the conventional Colpitts oscillation circuit that VCO oscillator is comprised of radio-frequency (RF) transistors and variable capacitance diode, modulation circuit can adopt the frequency modulation circuit with mixer action of the prior art, in the present invention, it has two-way input He Yi road output, and it carries out two-way input signal to export after mixing, the input of phase-locked loop circuit is the control end of up-converter module, be connected to the output of complete machine control module, the data wire pin SDA of the microprocessor IC that the respective pins of this phase-locked loop circuit is AT89S52 with above-mentioned model, serial clock pin SCL are connected respectively with 12V energization pins TU, and the output of phase-locked loop circuit is by the first via input of VCO oscillator access modulation circuit, the input that the second road input of modulation circuit is up-converter module, the second road input of the output access modulation circuit of above-mentioned vision signal generation module and audio signal generation module, the input of the output access radio frequency amplifier of modulation circuit, the output that the output of radio frequency amplifier is up-converter module, modulation circuit is added to the audio-video signal of input up-converter module in the tuning voltage of VCO oscillator, to be modulated into radiofrequency signal and to export via radio frequency amplifier, simultaneously, complete machine control module can be carried out free setting to the frequency of phase-locked loop circuit, thereby change the output frequency of VCO oscillator, the tuning voltage of the VCO oscillator of the audio-video signal stack different frequency of input up-converter module, the signal of the radio frequency amplifier output in last each up-converter module forms the audio frequency and video radiofrequency signal of analog satellite television signal generator output of the present invention jointly, this audio frequency and video radiofrequency signal access noise supercircuit, after superimposed RF white noise, i.e. output is for the analog satellite TV signal of analog satellite TV set-top box and tuner production test.
In addition, in order to meet the actual needs in analog satellite TV set-top box and tuner production test, the quantity of above-mentioned up-converter module can be according to testing requirement and corresponding adjustment, and the present invention is preferably set to eight, comprises that up-converter module 1 is to up-converter module 8.
Embodiments of the present invention are not limited to this, according to foregoing, according to ordinary skill knowledge and the customary means of this area, do not departing under the above-mentioned basic fundamental thought of the present invention prerequisite, the present invention can also make equivalent modifications, replacement or the change of other various ways, for example above-mentioned each module is selected chip or the circuit of other identical function, all can realize the object of the invention.
Claims (6)
1. an analog satellite television signal generator, it is characterized in that: described signal generator comprises that at least one is for the up-converter module of analog satellite TV signal modulation, for controlling the described operating frequency setting of each up-converter module and the complete machine control module of display simulation satellite TV signal generator operating state, the output of described complete machine control module is connected respectively to the control end of described each up-converter module, described complete machine control module is controlled described each up-converter module respectively by the original accompanying sound intermediate frequency signal and the vision signal that receive, by set operating frequency, carry out the modulation of analog satellite TV signal, described each up-converter module output is as the audio frequency and video radiofrequency signal of analog satellite TV signal,
Described signal generator also comprises for generation of the noise module of radio frequency white noise and the noise supercircuit for radio frequency white noise is added in radiofrequency signal, the output of described each up-converter module and noise module is connected respectively to the input of described noise supercircuit, the audio frequency and video radiofrequency signal of described each up-converter module output is superimposed by the radio frequency white noise of described noise supercircuit and the output of described noise module respectively, described noise supercircuit output is for the analog satellite TV signal of analog satellite TV set-top box and tuner production test.
2. analog satellite television signal generator according to claim 1, is characterized in that: described signal generator also comprises vision signal generation module for generation of raw video signal, for generation of the audio signal generation module of original accompanying sound intermediate frequency signal with for by original accompanying sound intermediate frequency signal and the impartial audio frequency and video distribution module of distributing output of vision signal; The output of described vision signal generation module and audio signal generation module is connected respectively to the input of described audio frequency and video distribution module, and the output of described audio frequency and video distribution module is connected respectively to the input of described each up-converter module.
3. analog satellite television signal generator according to claim 2, it is characterized in that: described vision signal generation module comprises for exporting the microcontroller of RGB color difference signal and H/V synchronizing signal, and the video coding chip for becoming raw video signal to export the Signal coding of described microcontroller output; The input of described video coding chip is connected to the corresponding interface of described microcontroller, and output is connected to the input of described audio frequency and video distribution module.
4. analog satellite television signal generator according to claim 2, it is characterized in that: described audio signal generation module comprises the audio frequency sine-wave oscillator for generation of original audio signal, and for the signal of described audio frequency sine-wave oscillator output being modulated into the intermediate frequency modulator of original accompanying sound intermediate frequency signal output; The input of described intermediate frequency modulator is connected to the output of described audio frequency sine-wave oscillator, and output is connected to the input of described audio frequency and video distribution module.
5. according to the analog satellite television signal generator described in any one in claim 1 to 4, it is characterized in that: described complete machine control module comprises microprocessor, display panels and key panel; The output of the control end of described each up-converter module, the input of display panels and key panel is connected to respectively the corresponding interface of described microprocessor by data/address bus.
6. analog satellite television signal generator according to claim 5, is characterized in that: the quantity of described up-converter module is eight.
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| CN101026749A (en) * | 2007-03-26 | 2007-08-29 | 北京创毅视讯科技有限公司 | System and method for providing test signal |
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| CN202004784U (en) * | 2011-04-18 | 2011-10-05 | 桂林市思奇通信设备有限公司 | Modulator of digital/analog audio broadcasting transmitting system |
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| US6377314B1 (en) * | 1998-07-31 | 2002-04-23 | Rf Technology, Inc. | Methods and apparatus for transmitting analog and digital information signals |
| US20050007498A1 (en) * | 2003-01-28 | 2005-01-13 | Conexant Systems, Inc. | Tuner for reception of digital and analog television signals |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101026749A (en) * | 2007-03-26 | 2007-08-29 | 北京创毅视讯科技有限公司 | System and method for providing test signal |
| CN101706580A (en) * | 2009-11-24 | 2010-05-12 | 北京航空航天大学 | PXIe bus based GNSS signal simulator and implementation method thereof |
| CN202004784U (en) * | 2011-04-18 | 2011-10-05 | 桂林市思奇通信设备有限公司 | Modulator of digital/analog audio broadcasting transmitting system |
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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. |