CN100373930C - Analogue TV differential rotating machine possessing digital TV program differential rotating function - Google Patents
Analogue TV differential rotating machine possessing digital TV program differential rotating function Download PDFInfo
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Abstract
The present invention relates to an analog television transposer with the transpositional function of digital television programs, which comprises a radio-frequency head for receiving satellite signals, a component for modulating and demodulating satellite digital television signals, a demultiplexer/decoder component, a component for encoding video signals and outputting filter waves, an audio DA converter, an output amplifying component, an image signal emitting component, an aural signal emitting component, a frequency multiplying component of local oscillation, a duplexer, an embedded control circuit, an operational key, a display panel, a smart card interface and a switch stabilized voltage power supply. According to the analog television transposer of the present invention, digital television programs and broadcasts can be effectively received, digital television signals are converted into analog television signals, and thus, the transposition of the analog television signals is realized; therefore, the situation that current users who receive television transpositional signals still need to use digital set-top boxes when the digital television broadcasts are received is avoided, and the users who receive the analog transpositional signals can also receive and watch the digital television programs.
Description
Technical field
What the present invention relates to is the device in a kind of digital television techniques field, relates in particular to a kind of simulated television transposer with digital TV program differential rotating function.
Technical background
Compare with traditional simulated television technology, advanced digital television techniques has tv signal-noise ratio height, channel resource utilance height, launches efficient height, picture quality is clear, display mode is flexible and be convenient to carry out the advantage that interactive service etc. is given prominence to, the total digitalization of television system has welcome the arrival in brand-new Digital Television epoch, and it has very far-reaching and wide influence.Yet to Digital Television progressively in the process of transition, a large amount of existing simulated television receivers mainly is to depend on top box of digital machine to accept digital television program at simulated television.Thereby top box of digital machine makes it normally to receive and to watch digital television program for the simulated television receiver provides analogue audio frequency and video interface.Top box of digital machine has become analog television broadcast and has given full play to and kept the capital equipment of the use value of simulated television transition period to digital television broadcasting, and plays an important role in the test of digital television broadcasting and exploration process at analog television broadcast.Yet, as everyone knows, although adopted after the top box of digital machine, digital television program can be accepted and show to the simulated television receiver, but can not be because of accepting and watching digital television program and improve the intrinsic display resolution of simulated television receiver, for the simulated television receiver, only only increased acceptable TV programme quantity.In other words, under general application conditions, the simulated television receiver still comes display image with original definition, and fail to obtain and show truly high definition or the image of single-definition, only just many one can accept and watch the function of digital television program.In addition, at present in some border districts or the zone that comparatively disperses of population also adopt TV differential relay to realize that the difference switching of TV programme is subjected to mode mostly.TV differential relay is a kind of television relay equipment of differential-steering type, also can be referred to as television relay equipment.In general, TV differential relay mainly comprises to be accepted and the emission two large divisions, and its major function is certain the channel TV program that will be received, and through after the frequency translation and power amplification of transposer, launches with another channel as required again.So, along with the raising of digital broadcasting technology with popularize, make the user in border district and sparsely populated zone can accept and watch digital television program just must use the Digital Television transposer.
Find through literature search prior art, December in 2003 institute on the 23rd submit applications U.S. Pat 6,668,022B1, be entitled as " using in the digital TV transposer method and apparatus that changes channel " and disclosed a kind of digital difference favourable turn that is applicable to and change the method and the device thereof of channel.Yet, although disclosed digital difference favourable turn technology can be advantageously applied to the direct poor commentaries on classics of digital television program, but, obviously, as other existing digital difference favourable turn, for the user who accepts TV difference rotaring signal, still need to use top box of digital machine could accept and show digital television program.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, the invention provides a kind of simulated television transposer with digital TV program differential rotating function, make its effectively receiving digital television programming, and convert digital television signal to anolog TV signals and realize that the anolog TV signals difference changes, thereby avoided the user who accepts TV difference rotaring signal at present when receiving digital television broadcast, need use top box of digital machine, and made the user who accepts the analogue difference rotaring signal can accept and watch digital television program equally.
The present invention is achieved by the following technical solutions, the present invention includes: satellite-signal is accepted tuner, satellite digital TV signal tuning demodulation parts, demodulation multiplexer/decoder component, video signal coding and filtering output block, audio frequency DA transducer and output amplifier unit, picture signal emission element, audio signal emission element, local oscillator frequency multiplication parts, duplexer, embedded Control circuit, operation push-button and display floater parts, intelligent card interface and switching power supply.The interconnected relationship of each parts is: satellite-signal is accepted then satellite antenna of tuner feedback, and its output is connecting satellite digital TV signal tuning demodulation parts; The output of satellite digital TV signal tuning demodulation parts is connecting the input of demodulation multiplexer/decoder component, and two outputs of demodulation multiplexer/decoder component are then connecting the input of video signal coding and filtering output block and audio frequency DA transducer and output amplifier unit respectively; The output of video signal coding and filtering output block is then connecting the input of picture signal emission element, the output of audio frequency DA transducer and output amplifier unit is then connecting the input of audio signal emission element, the output of local oscillator frequency multiplication parts is connecting the control end of above-mentioned picture signal emission element and audio signal emission element respectively, and picture signal emission element and the output of audio signal emission element are being connected the input of duplexer respectively, and the output of duplexer is connecting transmitting antenna; Wherein, the embedded Control circuit block can be used as the main control unit of complete machine, connect respectively and controlling satellite digital TV signal tuning demodulation parts, demodulation multiplexer/decoder component, video signal coding and filtering output block and audio frequency DA transducer and output amplifier unit by the I2C bus, also connecting operation push-button and display floater parts and intelligent card interface, be used to control and coordinate inter-working and work schedule between each parts by GPIO.In addition, switching power supply provides the power power-supply of dc supply, picture signal emission element and audio signal emission element of each parts of complete machine and the transmitting power power supply of duplexer.
Satellite-signal is accepted band pass filter, low-converter and the pre-IF amplifier that tuner comprises that reactatron, image frequency are restrained; Be mainly used in and antenna feed is connect the satellite-signal that is received carry out that noiselike signal amplifies and single-conversion, the satellite-signal that is received is transformed into the RF signal of 950-2150MHz.Tuner commonly used can have frequency range to be respectively several types such as 10.7-11.8GHz, 11.7-12.2GHz, 11.7GHz-12.75GHz.
Satellite digital TV signal tuning demodulation parts comprise satellite-signal tuner and qpsk demodulator; Wherein, the satellite-signal tuner can amplify the received satellite-signal from the satellite antenna tuner (RF signal), filtering and double conversion, and the conversion of signals after the frequency conversion is become two-way intermediate-freuqncy signal I and Q and imports qpsk demodulator; Qpsk demodulator then will convert two ways of digital signals to by the I and the Q signal of tuner input, and the demodulation of qpsk demodulator, decode, deinterleave and descrambling after the transmission code stream of outputting standard.
Demodulation multiplexer/decoder component comprises transmission flow demultiplexing device and MPEG2 decoder; Wherein, demodulation multiplexer is used for the transmission code stream of being imported is carried out demultiplexing, so that from the Voice ﹠ Video data of transmission extracting data selected program, and program specific information, information on services and enciphered data etc.; The MPEG2 decoder also comprises decoder, audio, video data buffer, a plurality of channel interface and the video display interface and the audio output interface of Voice ﹠ Video; Video Decoder and video data buffer are used for forming rebuilding module according to the coded format of MPEG2, promptly be reduced into encoding compression raw image data before, and output meets the video data that ITU-R601 advises, audio decoder and data buffer are analyzed the voice data of being imported and decoded and outputting audio data.
Video signal coding and filtering output block comprise video encoder and output filter; Wherein, video encoder is to video data realization digital-to-analogue conversion of being imported and the anolog TV signals of exporting various standards according to the requirement of ITU-R601 suggestion; Output filter then is used to remove the noise in the band, promotes overall dynamic range, so that the analog video signal of outputting high quality.
Audio frequency DA transducer and output amplifier unit are realized digital-to-analogue conversion to the voice data of being imported, and pass through the simulated audio signal of relevant audio output circuit outputting high quality.
The picture signal emission element comprises video, intermediate frequency and three parts of high frequency; Wherein, video section also comprises clamp amplifying circuit and differential phase correction circuit, intermediate-frequency section also comprises image modulation circuit, residual sideband filter circuit, group delay correction circuit, differential gain correction circuit, and HFS also comprises image frequency changer circuit, local oscillator frequency conversion and amplifying circuit, modulated wave high-frequency power amplifying circuit; It is mainly used in after processing of vision signal process and the frequency translation, forms the high-frequency signal of compound standard-required and has required power level.
The audio signal emission element comprises sound accompaniment modulation circuit, frequency modulation phase locking frequency stabilized circuit, audio signal frequency changer circuit and high-frequency power amplifying circuit; It is mainly used in the audio signal that will be imported and adopts the mode of frequency modulation to be modulated on the sound intermediate frequency, is transformed to the sound accompaniment high-frequency signal of transmitting channel subsequently, and is amplified to required power level by the high-frequency power amplifying circuit lifting.
Local oscillator frequency multiplication parts provide the local oscillator frequency-doubled signal of picture signal emission element and audio signal emission element.
It is synthetic that duplexer then carries out the power output of the power output of picture signal emission element and audio signal emission element power, gone out with the form of electromagnetic wave radiated emission by transmitting antenna after both are synthetic.
The embedded Control circuit comprises microcontroller, program storage (EPROM or FLASH), data storage (DRAM or SDRAM), bus driver and various interface circuit, constitute the control centre of complete machine, it mainly acts on is the work that is used to control and coordinate each component circuitry of complete machine, initialization and test, the security information of finishing machine system handled, communication interface standard is handled, the selection of input program is handled and tasks such as control and program, and can realize guidance panel interface and operation of IR remote controller interface and use according to user's needs.
Operation push-button and display floater parts comprise the LCD display floater that some can provide the operation push-button of user's direct control and be used to show the complete machine operating state, and the user can utilize these operation push-buttons and display floater to realize human-computer dialogue.
Intelligent card interface can provide the condition receiving system of realizing the satellite digital TV programme signal, receives so that realize the condition of multiple different cipher modes.
Switching power supply provides the DC power supply of work for each parts of complete machine, and the power power-supply of picture signal emission element and audio signal emission element and the transmitting power power supply of duplexer are provided.
Control flow with simulated television transposer of digital TV program differential rotating function according to the present invention is: in case after working on power, the embedded Control circuit at first carries out the test of initialization operation and complete machine operating state to complete machine, and in operating process, microcontroller can be directly fetch program instruction from the FLASH memory, and the step of fixing according to program is carried out respective phases of operation, microcontroller also reads the data that realize that operation is required from the SDRAM memory, to finish every function setting of complete machine.Because microcontroller can pass through I
2The C bus is connected with above-mentioned memory, audio/video coder and tuning demodulator, so microcontroller can pass through I
2The C bus reads the channel parameter that is stored in the memory, and passes through I
2The C bus is fed to satellite-signal tuning demodulator parts with channel parameter, selects corresponding channel to control these parts according to parameter.Microcontroller also can pass through I
2The C bus is provided with video signal coding and filtering output block and audio frequency DA transducer and output amplifier unit, makes it to realize according to set working method format conversion and the output of anolog TV signals and the amplification output of audio signal of vision signal.Microcontroller is connected with operation push-button and display floater parts with intelligent card interface respectively by the GPIO interface, makes that microcontroller can be by the decruption key of GPIO interface reading encrypted program from the intelligent card interface circuit; Also can realize and user's human-computer dialogue, also show these various situations so that select to control the complete machine operating state according to the user by the GPIO interface.Wherein, the demonstration of operating state comprises: satellite digital TV programme signal selection mode, channel selection parameter, the demonstration that the various time is provided with, erroneous words demonstration, audio-video signal output and the transmitting power and the state etc. of error status.
Transmission signals flow process with simulated television transposer of digital TV program differential rotating function according to the present invention is: the RF signal of being accepted the tuner institute feed-in of satellite antenna by satellite digital TV signal tuning demodulation parts, the RF signal of being imported carries out low noise amplification, filtering and double conversion by tuner, the conversion of signals that is received is become second intermediate frequency, I that can export tuner and the Q signal numeral that converts two-way to subsequently, and by qpsk demodulator realize the signal demodulation, a series of processing such as decode and deinterleave, make it to form basic transmission code stream.If the transmission code stream of being exported is a ciphered program, then microcontroller just reads the authorized user message that is arranged in the smart card, and itself and the program authorization message that extracted from transmission code stream compared, in case both are consistent at condition, then can from qualified information, solve or obtain control word wherein, and can realize the descrambling of transmission code stream, thereby form the transmission code stream that meets Moving Picture Experts Group-2 with this control word; Otherwise, then need not to be decrypted and the operation of descrambling.In case import after the suitable data code flow, demodulation multiplexer/decoder component resolves into program stream with transmission code stream earlier, and then program stream is resolved into the elementary stream of audio frequency, video and exclusive data, the Voice ﹠ Video elementary stream is reduced into original Voice ﹠ Video data through the Voice ﹠ Video decoding, and the voice data and the video data of decode reduction is fed to audio frequency DA transducer and output amplifier unit and video signal coding and filtering output block respectively.Thereby can amplify the vision signal of output sound accompaniment audio signal and video signal output part outputting standard by audio frequency amplifier.The vision signal of received image signal emission element after treatment, can be modulated in the intermediate frequency of 37MHz, subsequently can be by the signal below the residual sideband filter circuit filtering 31MHz and more than the 37.75MHz, residual sideband characteristic in the formation, after by group delay correction circuit and differential gain correction, intermediate frequency modulated wave signal is carried out frequency translation, make it to transform to the high-frequency signal that forms compound required standard on the high frequency of transmitting channel and have the power demand level.The audio signal that is input to the audio signal emission element then adopts the direct frequency modulation method directly audio signal to be transformed into the sound accompaniment high-frequency signal of transmitting channel and has the certain power level.Then, above-mentioned high-frequency video signal and high frequency audio signal are imported duplexer together, the power of the power output of duplexer realization picture signal emission element and the power output of audio signal emission element is synthetic, and with both power synthetic after, go out with the form of electromagnetic wave radiated emission by transmitting antenna.
Obviously, compare with the simulated television transposer or the digital difference favourable turn of prior art, simulated television transposer with digital TV program differential rotating function according to the present invention can be realized effective acceptance of satellite digital TV signal easily according to user's selection under the control of embedded Control circuit, and become the analog television program signal to differ from commentaries on classics the digital television program conversion of signals that is received, thereby the analogue difference that has realized the digital television program signal is changeed.The user that simulated television transposer with digital TV program differential rotating function can be widely applicable for relatively poor border district of digital television signal reception environment or sparsely populated zone can directly accept traditional analogue difference and change TV signal and accept and show digital television program not needing to use under the condition of top box of digital machine, thereby can at simulated television in the process that Digital Television is changed, further bring into play and utilize the effect of the huge simulated television receiver of on-hand quantity.
Description of drawings
Fig. 1 is the electric functional-block diagram with simulated television transposer of digital TV program differential rotating function.
Embodiment
Fig. 1 has shown the electric functional-block diagram that has the simulated television transposer of digital TV program differential rotating function according to of the present invention.As shown in Figure 1, the simulated television transposer with digital TV program differential rotating function comprises: satellite-signal is accepted tuner 1, satellite digital TV signal tuning demodulation parts 2, demodulation multiplexer/decoder component 3, video signal coding and filtering output block 4, audio frequency DA transducer and output amplifier unit 5, picture signal emission element 6, audio signal emission element 7, local oscillator frequency multiplication parts 8, duplexer 9, embedded Control circuit 10, operation push-button and display floater parts 11, intelligent card interface 12 and switching power supply 13.The interconnected relationship of each parts is: satellite-signal is accepted then satellite antenna of tuner 1 feedback, and its output is connecting satellite digital TV signal tuning demodulation parts 2; The output of satellite digital TV signal tuning demodulation parts 2 is connecting the input of demodulation multiplexer/ decoder component 3, and 3 two outputs of demodulation multiplexer/decoder component are then connecting the input of video signal coding and filtering output block 4 and audio frequency DA transducer and output amplifier unit 4 respectively; The output of video signal coding and filtering output block 4 is then connecting the input of picture signal emission element 6, the output of audio frequency DA transducer and output amplifier unit 5 is then connecting the input of audio signal emission element 7, the output of local oscillator frequency multiplication parts 8 is connecting the control end of above-mentioned picture signal emission element 6 and audio signal emission element 7 respectively, and picture signal emission element 6 and the output of audio signal emission element 7 are being connected the input of duplexer 9 respectively, and the output of duplexer 9 is connecting transmitting antenna; Wherein, embedded Control circuit block 10 can be used as the main control unit of complete machine, passes through I
2The C bus connects respectively and is controlling satellite digital TV signal tuning demodulation parts 2, demodulation multiplexer/decoder component 3, video signal coding and filtering output block 4 and audio frequency DA transducer and exporting amplifier unit 5, also can connect operation push-button and display floater parts 11 and intelligent card interface 12, be used to control and coordinate inter-working and work schedule between each parts by GPIO.In addition, switching power supply 13 provides the power power-supply of dc supply, picture signal emission element 6 and audio signal emission element 7 of each parts of complete machine and the transmitting power power supply of duplexer 9.
Satellite-signal is accepted band pass filter, low-converter and the pre-IF amplifier that tuner 1 comprises that reactatron, image frequency are restrained; Be mainly used in and antenna feed is connect the satellite-signal that is received carry out that noiselike signal amplifies and single-conversion, the satellite-signal that is received is transformed into the RF signal of 950-2150MHz.Tuner commonly used can have frequency range to be respectively several types such as 10.7-11.8GHz, 11.7-12.2GHz, 11.7GHz-12.75GHz.
Satellite digital TV signal tuning demodulation parts 2 comprise satellite-signal tuner and qpsk demodulator; Wherein, the satellite-signal tuner to received satellite-signal (RF signal) from satellite antenna tuner 1 amplify, filtering and double conversion, and the conversion of signals after the frequency conversion become two-way intermediate-freuqncy signal I and Q and imports qpsk demodulator; Qpsk demodulator then will convert two ways of digital signals to by the I and the Q signal of tuner input, and the demodulation of qpsk demodulator, decode, deinterleave and descrambling after the transmission code stream of outputting standard.
Demodulation multiplexer/sign indicating number device parts 3 comprise transmission flow demultiplexing device and MPEG2 decoder; Wherein, demodulation multiplexer is used for transmission code stream is carried out demultiplexing, so that from the Voice ﹠ Video data of transmission extracting data selected program, and program specific information, information on services and enciphered data etc.; The MPEG2 decoder also comprises decoder, audio, video data buffer, a plurality of channel interface and the video display interface and the audio output interface of Voice ﹠ Video; Video Decoder and video data buffer are used for forming rebuilding module according to the coded format of MPE62, promptly be reduced into encoding compression raw image data before, and output meets the video data that ITU-R601 advises, audio decoder and data buffer are analyzed the voice data of being imported and decoded and outputting audio data.
Video signal coding and filtering output block 4 comprise video encoder and output filter; Wherein, video encoder is realized digital-to-analogue conversion, and can be exported the anolog TV signals of various standards according to the requirement of ITU-R601 suggestion the video data imported; Output filter then is used to remove the noise in the band, promotes overall dynamic range, so that the analog video signal of outputting high quality.
Audio frequency DA transducer and 5 pairs of voice datas of being imported of output amplifier unit are realized digital-to-analogue conversion, and pass through the simulated audio signal of relevant audio output circuit outputting high quality.
Picture signal emission element 6 comprises video, intermediate frequency and three parts of high frequency; Wherein, video section also comprises clamp amplifying circuit and differential phase correction circuit, intermediate-frequency section also comprises image modulation circuit, residual sideband filter circuit, group delay correction circuit, differential gain correction circuit, and HFS also comprises image frequency changer circuit, local oscillator frequency conversion and amplifying circuit, modulated wave high-frequency power amplifying circuit; It is mainly used in after processing of vision signal process and the frequency translation, forms the high-frequency signal that conformance with standard required and had the power demand level.
Audio signal emission element 7 comprises sound accompaniment modulation circuit, frequency modulation phase locking frequency stabilized circuit, audio signal frequency changer circuit and high-frequency power amplifying circuit; It is mainly used in the audio signal that will be imported and adopts the mode of frequency modulation to be modulated on the sound intermediate frequency, is transformed to the sound accompaniment high-frequency signal of transmitting channel subsequently and is amplified to required power level by the high-frequency power amplifying circuit lifting.
Local oscillator frequency multiplication parts 8 provide the local oscillator frequency-doubled signal of picture signal emission element 6 and audio signal emission element 7.
It is synthetic that 9 of duplexers carry out power with the power output of the power output of picture signal emission element 6 and audio signal emission element 7, gone out with the form of electromagnetic wave radiated emission by transmitting antenna after both are synthetic.
Embedded Control circuit 10 comprises microcontroller, program storage (EPROM or FLASH), data storage (DRAM or SDRAM), bus driver and various interface circuit, constitute the control centre of complete machine, it mainly acts on is the work that is used to control and coordinate each component circuitry of complete machine, initialization and test, the security information of finishing machine system handled, communication interface standard is handled, the input program is selected to handle and tasks such as control and program, and can realize guidance panel interface 11 and IR remote controller (not shown) interface operation and use according to user's needs.
Operation push-button and display floater parts 11 comprise the LCD display floater that some can provide the operation push-button of user's direct control and be used to show the complete machine operating state, and the user can utilize these operation push-buttons and display floater to realize human-computer dialogue.
Switching power supply 13 provides the DC power supply of work for each parts of complete machine, and the power power-supply of picture signal emission element 6 and audio signal emission element 7 and the transmitting power power supply of duplexer 9 are provided.
Control flow with simulated television transposer of digital TV program differential rotating function according to the present invention is: in case after working on power, embedded Control circuit 10 at first carries out the test of initialization operation and complete machine operating state to complete machine, and in operating process, microcontroller can be directly fetch program instruction from the FLASH memory, and the step of fixing according to program is carried out respective phases of operation, microcontroller also reads the data that realize that operation is required from the SDRAM memory, to finish every function setting of complete machine.Because microcontroller can pass through I
2The C bus is connected with above-mentioned memory, audio/video coder and tuning demodulator, so microcontroller can be by 1
2The C bus reads the channel parameter that is stored in the memory, and passes through I
2The C bus is fed to satellite-signal tuning demodulator parts 2 with channel parameter, selects corresponding channel to control this parts 2 according to parameter.Microcontroller also can pass through I
2The C bus is provided with video signal coding and filtering output block 4 and audio frequency DA transducer and output amplifier unit 5, makes it to realize according to set working method format conversion and the output of anolog TV signals and the amplification output of audio signal of vision signal.Microcontroller can be connected with intelligent card interface 12, operation push-button and display floater parts 11 respectively by the GPIO interface.Make that microcontroller can be by the decruption key of GPIO interface reading encrypted program from intelligent card interface 12; Also can realize and user's human-computer dialogue, also show these various situations so that select to control the complete machine operating state according to the user by the GPIO interface.Wherein, the demonstration of operating state comprises: satellite digital TV programme signal selection mode, channel selection parameter, the demonstration that the various time is provided with, erroneous words demonstration, audio-video signal output and the transmitting power and the state etc. of error status.
Transmission signals flow process with simulated television transposer of digital TV program differential rotating function according to the present invention is: the RF signal of being accepted 1 feed-in of tuner of satellite antenna by satellite digital TV signal tuning demodulation parts 2, the RF signal of being imported carries out low noise amplification, filtering and double conversion by tuner, and convert thereof into second intermediate frequency, I that can export tuner and the Q signal numeral that converts two-way to subsequently, and by qpsk demodulator realize the signal demodulation, a series of processing such as decode and deinterleave, make it to form basic transmission code stream.If the transmission code stream of being exported is a ciphered program, then microcontroller just reads the authorized user message that is arranged in the smart card, and itself and the program authorization message that extracted from transmission code stream compared, in case both are consistent at condition, then can from qualified information, solve or obtain control word wherein, and can realize the descrambling of transmission code stream, thereby form the transmission code stream that meets Moving Picture Experts Group-2 with this control word, otherwise, then need not to be decrypted and the operation of descrambling.In case import after the suitable data code flow, demodulation multiplexer/decoder component 3 resolves into program stream with transmission code stream earlier, and then program stream is resolved into the elementary stream of audio frequency, video and exclusive data, the Voice ﹠ Video elementary stream is reduced into original Voice ﹠ Video data through the Voice ﹠ Video decoding, and the voice data and the video data of decode reduction is fed to audio frequency DA transducer and output amplifier unit 5 and video signal coding and filtering output block 4 respectively.Thereby can amplify the vision signal of output sound accompaniment audio signal and video signal output part outputting standard by audio frequency amplifier.The vision signal of received image signal emission element 6 after treatment, can be modulated in the intermediate frequency of 37MHz, subsequently can be by the signal below the residual sideband filter circuit filtering 31MHz and more than the 37.75MHz, residual sideband characteristic in the formation, after by group delay correction circuit and differential gain correction, intermediate frequency modulated wave signal is carried out frequency translation, make it to transform to the high-frequency signal that forms compound required standard on the high frequency of transmitting channel and have the power demand level.The audio signal that is input to audio signal emission element 7 then adopts the direct frequency modulation method directly audio signal to be transformed into the sound accompaniment high-frequency signal of transmitting channel and has the certain power level.Then, above-mentioned high-frequency video signal and high frequency audio signal are imported duplexer 9 together, the power of the power output of duplexer 9 realization picture signal emission elements 6 and the power output of audio signal emission element 7 is synthetic, and with both power synthetic after, go out with the form of electromagnetic wave radiated emission by transmitting antenna.
Obviously, compare with the simulated television transposer of the simple function of prior art or the digital difference favourable turn of simple function, simulated television transposer with digital TV program differential rotating function according to the present invention can be realized effective acceptance of satellite digital TV signal easily according to user's selection under the control of embedded Control circuit, and become the analog television program signal to differ from commentaries on classics the digital television program conversion of signals that is received, thereby the analogue difference that has realized the digital television program signal is changeed.The user that simulated television transposer with digital TV program differential rotating function can be widely applicable for relatively poor border district of digital television signal reception environment or sparsely populated zone can directly accept traditional analogue difference and change TV signal and accept and show digital television program not needing to use under the condition of top box of digital machine, thereby can at simulated television in the process that Digital Television is changed, further bring into play and utilize the effect of the huge simulated television receiver of on-hand quantity.
In addition, although technique scheme adopts audio signal and vision signal to modulate the binary channels amplifying emission technology of independent amplification respectively, but the present invention is not limited to binary channels amplifying emission technology, obviously, technical scheme of the present invention also can adopt audio signal and vision signal to modulate respectively and common single channel amplifying emission technology of amplifying.
Claims (10)
1. simulated television transposer with digital TV program differential rotating function, comprising: satellite-signal is accepted tuner (1), satellite digital TV signal tuning demodulation parts (2), demodulation multiplexer/decoder component (3), video signal coding and filtering output block (4), audio frequency DA transducer and output amplifier unit (5), picture signal emission element (6), audio signal emission element (7), local oscillator frequency multiplication parts (8), duplexer (9), embedded Control circuit (10), operation push-button and display floater parts (11), intelligent card interface (12) and switching power supply (13); It is characterized in that: satellite-signal is accepted then satellite antenna of tuner (1) feedback, and its output is connecting satellite digital TV signal tuning demodulation parts (2); The output of satellite digital TV signal tuning demodulation parts (2) is connecting the input of demodulation multiplexer/decoder component (3), and (3) two outputs of demodulation multiplexer/decoder component are then connecting the input of video signal coding and filtering output block (4) and audio frequency DA transducer and output amplifier unit (5) respectively; The output of video signal coding and filtering output block (4) is then connecting the input of picture signal emission element (6), the output of audio frequency DA transducer and output amplifier unit (5) is then connecting the input of audio signal emission element (7), the output of local oscillator frequency multiplication parts (8) is connecting the control end of picture signal emission element (6) and audio signal emission element (7) respectively, and picture signal emission element (6) and the output of audio signal emission element (7) are being connected the input of duplexer (9) respectively, and the output of duplexer (9) is connecting transmitting antenna; In addition, embedded Control circuit block (10) passes through I as the main control unit of complete machine
2The C bus connects respectively and is controlling satellite digital TV signal tuning demodulation parts (2), demodulation multiplexer/decoder component (3), video signal coding and filtering output block (4) and audio frequency DA transducer and exporting amplifier unit (5), embedded Control circuit block (10) is also connecting operation push-button and display floater parts (11) and intelligent card interface (12) by GPIO, is used to control and coordinates inter-working and work schedule between each parts; Switching power supply (13) provides the power power-supply of dc supply, picture signal emission element (6) and audio signal emission element (7) of each parts of complete machine and the transmitting power power supply of duplexer (9).
2. the simulated television transposer with digital TV program differential rotating function as claimed in claim 1, it is characterized in that, described satellite-signal is accepted band pass filter, low-converter and the pre-IF amplifier that tuner (1) comprises that reactatron, image frequency are restrained, be used for that antenna feed is connect the satellite-signal that is received and carry out noiselike signal amplification and single-conversion, the satellite-signal that is received is transformed into the RF signal of 950-2150MHz.
3. the simulated television transposer with digital TV program differential rotating function as claimed in claim 1, it is characterized in that, described satellite digital TV signal tuning demodulation parts (2) comprise satellite-signal tuner and qpsk demodulator, are used to receive, tuning and demodulation presents the satellite-signal that connects input; Wherein, the satellite-signal tuner to received satellite-signal from the satellite antenna tuner amplify, filtering and double conversion, the conversion of signals after the frequency conversion is become two-way intermediate-freuqncy signal I and Q and imports qpsk demodulator; Qpsk demodulator then will convert two ways of digital signals to by I and the Q signal that tuner is imported, and the demodulation of qpsk demodulator, decode, deinterleave and descrambling after the outputting standard transmission code stream.
4. the simulated television transposer with digital TV program differential rotating function as claimed in claim 1, it is characterized in that, described demodulation multiplexer/decoder component (3) comprises transmission flow demultiplexing device and MPEG2 decoder, wherein, demodulation multiplexer is used for the transmission code stream of being imported is carried out demultiplexing, so that from the Voice ﹠ Video data of transmission extracting data selected program, and program specific information, information on services and enciphered data; The MPEG2 decoder comprises decoder and audio, video data buffer, a plurality of channel interface and the video display interface and the audio output interface of Voice ﹠ Video, Video Decoder and video data buffer are used for forming rebuilding module according to the coded format of MPEG2, promptly be reduced into encoding compression raw image data before, and output meets the video data that ITU-R601 advises, audio decoder and data buffer are analyzed the voice data of being imported and decoded and outputting audio data.
5. the simulated television transposer with digital TV program differential rotating function as claimed in claim 1, it is characterized in that, described video signal coding and filtering output block (4) comprise video encoder and output filter, wherein, video encoder is to video data realization digital-to-analogue conversion of being imported and the anolog TV signals of exporting various standards according to the requirement of ITU-R601 suggestion; Output filter then is used to remove the noise in the band, promotes overall dynamic range, so that the analog video signal of outputting high quality.
6. the simulated television transposer with digital TV program differential rotating function as claimed in claim 1, it is characterized in that described audio frequency DA transducer and output amplifier unit (5) comprise the digital to analog converter of realizing the voice data digital-to-analogue conversion and the output amplifier that is used for the voice data that audio decoder is exported is converted to audio analog signals.
7. the simulated television transposer with digital TV program differential rotating function as claimed in claim 1, it is characterized in that, described picture signal emission element (6) comprises video, intermediate frequency and three parts of high frequency, wherein, video section also comprises clamp amplifying circuit and differential phase correction circuit, intermediate-frequency section also comprises image modulation circuit, residual sideband filter circuit, group delay correction circuit, differential gain correction circuit, and HFS also comprises image frequency changer circuit, local oscillator frequency conversion and amplifying circuit, modulated wave high-frequency power amplifying circuit; Picture signal emission element (6) is used for forming the high-frequency signal that conformance with standard required and had the power demand level with after processing of vision signal process and the frequency translation.
8. the simulated television transposer with digital TV program differential rotating function as claimed in claim 1, it is characterized in that, described audio signal emission element (7) comprises sound accompaniment modulation circuit, frequency modulation phase locking frequency stabilized circuit, audio signal frequency changer circuit and high-frequency power amplifying circuit, the audio signal that is used for being imported adopts the mode of frequency modulation to be modulated to sound intermediate frequency, is transformed to the sound accompaniment high-frequency signal of transmitting channel subsequently and is amplified to required power level by the high-frequency power amplifying circuit lifting.
9. the simulated television transposer with digital TV program differential rotating function as claimed in claim 1, it is characterized in that, described duplexer (9) is used for that the power output of the power output of picture signal emission element and audio signal emission element is carried out power and synthesizes, and is gone out with the form of electromagnetic wave radiated emission by transmitting antenna after both are synthetic.
10. the simulated television transposer with digital TV program differential rotating function as claimed in claim 1, it is characterized in that, described embedded Control circuit (10) comprises microcontroller, program storage, data storage, bus driver and various interface circuit, constituted the main control unit of set-top box complete machine, being used to control and coordinating inter-working and work schedule between each parts of complete machine, specifically is to pass through I
2The work of each component circuitry of complete machine is controlled and coordinated to the C bus, initialization and test, the security information of finishing the set-top box machine system handled, communication interface standard is handled, the input program is selected to handle and control and program, and realizes guidance panel interface operation and use according to user's needs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100307580A CN100373930C (en) | 2005-10-27 | 2005-10-27 | Analogue TV differential rotating machine possessing digital TV program differential rotating function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100307580A CN100373930C (en) | 2005-10-27 | 2005-10-27 | Analogue TV differential rotating machine possessing digital TV program differential rotating function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1753471A CN1753471A (en) | 2006-03-29 |
| CN100373930C true CN100373930C (en) | 2008-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100307580A Expired - Fee Related CN100373930C (en) | 2005-10-27 | 2005-10-27 | Analogue TV differential rotating machine possessing digital TV program differential rotating function |
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| Country | Link |
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| CN (1) | CN100373930C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510969B (en) * | 2009-02-26 | 2011-04-06 | 四川长虹电器股份有限公司 | Analog digital television integrated system and switching method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9942618B2 (en) * | 2007-10-31 | 2018-04-10 | The Directv Group, Inc. | SMATV headend using IP transport stream input and method for operating the same |
| CN107770469A (en) * | 2016-08-15 | 2018-03-06 | 晨星半导体股份有限公司 | The TV signal processing method of television video signal processing circuit and correlation |
| CN111130746A (en) * | 2020-01-03 | 2020-05-08 | 西北工业大学 | Method for transmitting telemetering data through sound channel |
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| CN2084692U (en) * | 1990-08-11 | 1991-09-11 | 张必旺 | Full automatic integrated circuit small tv difference frequency relay |
| CN2457799Y (en) * | 2000-10-24 | 2001-10-31 | 深圳市同洲电子有限公司 | Satellite multi-media data receiver |
| CN2520615Y (en) * | 2001-07-06 | 2002-11-13 | 林光漫 | Intelligent wired and wireless TV signal transmitting device and receiving device |
| US6668022B1 (en) * | 1999-08-12 | 2003-12-23 | Lg Information & Communications, Ltd. | Method and apparatus for modification of channel in digital TV translator |
| CN1602057A (en) * | 2004-09-21 | 2005-03-30 | 深圳国微技术有限公司 | Access device and realizing method based on CI interface of ground and satellite diyital television |
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Patent Citations (5)
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|---|---|---|---|---|
| CN2084692U (en) * | 1990-08-11 | 1991-09-11 | 张必旺 | Full automatic integrated circuit small tv difference frequency relay |
| US6668022B1 (en) * | 1999-08-12 | 2003-12-23 | Lg Information & Communications, Ltd. | Method and apparatus for modification of channel in digital TV translator |
| CN2457799Y (en) * | 2000-10-24 | 2001-10-31 | 深圳市同洲电子有限公司 | Satellite multi-media data receiver |
| CN2520615Y (en) * | 2001-07-06 | 2002-11-13 | 林光漫 | Intelligent wired and wireless TV signal transmitting device and receiving device |
| CN1602057A (en) * | 2004-09-21 | 2005-03-30 | 深圳国微技术有限公司 | Access device and realizing method based on CI interface of ground and satellite diyital television |
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| CN101510969B (en) * | 2009-02-26 | 2011-04-06 | 四川长虹电器股份有限公司 | Analog digital television integrated system and switching method thereof |
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|---|---|
| CN1753471A (en) | 2006-03-29 |
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