CN107707961A - A kind of application method of dual output optical fiber tuner - Google Patents

A kind of application method of dual output optical fiber tuner Download PDF

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Publication number
CN107707961A
CN107707961A CN201711042690.7A CN201711042690A CN107707961A CN 107707961 A CN107707961 A CN 107707961A CN 201711042690 A CN201711042690 A CN 201711042690A CN 107707961 A CN107707961 A CN 107707961A
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CN
China
Prior art keywords
module
output end
low noise
amplification module
controller
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201711042690.7A
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Chinese (zh)
Inventor
吕兵
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Guanghan Guangda Electronics Co Ltd
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Guanghan Guangda Electronics Co Ltd
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Application filed by Guanghan Guangda Electronics Co Ltd filed Critical Guanghan Guangda Electronics Co Ltd
Priority to CN201711042690.7A priority Critical patent/CN107707961A/en
Publication of CN107707961A publication Critical patent/CN107707961A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
    • H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/22—Adaptations for optical transmission

Abstract

The invention discloses a kind of application method of dual output optical fiber tuner, comprise the following steps：In whole process, signal magnitude and transmission to controller, the controller in the first power detection module detection signal transmission path adjust the gain of the first low noise amplification module, the first high frequency amplifying module and the first intermediate frequency amplification module according to signal magnitude；Signal magnitude and transmission to controller, controller in second power detection module detection signal transmission path adjusts the gain of the second low noise amplification module, the second high frequency amplifying module and the second intermediate frequency amplification module according to signal magnitude.The present invention is adjusted according to gain of the actual conditions to low noise amplification module, high frequency amplifying module and intermediate frequency amplification module, while two lines are controlled using same controller, phaselocked loop and oscillator, are economized on resources.

Description

A kind of application method of dual output optical fiber tuner
Technical field
The present invention relates to a kind of application method of dual output optical fiber tuner.
Background technology
In recent years, due to optical fiber and optical device, the significantly downslide of light device price, especially transmission loss index is big Big optimization, various regions broadcasting and TV Transmission Co., Ltd proceed by the construction of all optical network.After i.e. broadcasting and TV optical signal transmission reaches cell, no longer turn It is changed to electric signal and enters coaxial cable distribution net network, but directly optical signal is allocated, optical fiber directly arrives family, in user family In recycle small light receiver device to carry out opto-electronic conversion, Transmission system no longer needs substantial amounts of amplifier, and reduces pair Its requirement being powered, not only greatly reduce the generation of the loss of signal and interference, reliability, the maintainability of Transmission system Greatly promoting, construction cost and maintenance cost substantially reduce, and because the anti-interference of optical fiber transmission is much stronger than cable transmission, And transmission bandwidth is wider, more programme informations can be transmitted to user's family, including tens sets of high-definition television programs, utilize ripple Divide multiplexing technology to realize the bi-directionally transmitted of uplink and downlink signals, meet three nets that client is surfed the Net by CHINA RFTCOM Co Ltd and melt Close and require, therefore broadcasting and TV fiber entering household is widely popularized throughout the country, and newly-built community broadcasting and TV were also become in 2015 The professional standard of networking.In order to not waste the resource of original CATV set-top-box, broadcasting and TV Transmission Co., Ltd is needed to these The client for being continuing with CATV set-top-box is equipped with an external small light receiver terminal equipment, and the intelligent acess light connects After receiving machine equipment, cable of cable TV signal is converted to, the input of former CATV set-top-box is transferred to through coaxial cable, passed through Standard television signal, which is converted to, after tuning, demodulation, decoding carries out program viewing.But existing dual output optical fiber is adopted with tuner It is mixed respectively with frequency mixer with two single phaselocked loops and oscillator, waste of resource；Also can't be according to actual conditions to letter Number size is adjusted.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of user of dual output optical fiber tuner Method.
The purpose of the present invention is achieved through the following technical solutions：A kind of user of dual output optical fiber tuner Method, described tuner include the first photoelectric conversion module, the second photoelectric conversion module, the first impedance matching module, the second resistance Anti- matching module, the first low noise amplification module, the second low noise amplification module, the first bandpass filtering modules block, the filter of the second band logical Ripple module, the first high frequency amplifying module, the second high frequency amplifying module, the first frequency mixer, the second frequency mixer, oscillator, phaselocked loop, First intermediate frequency amplification module, the second intermediate frequency amplification module, controller, the first power detection module and the second power detection module, Described the first low noise amplification module, the second low noise amplification module, the first high frequency amplifying module, the second High frequency amplification mould Block, the first intermediate frequency amplification module and the second intermediate frequency amplification module are adjustable gain amplification module；
First photoelectric conversion module receives the first external fiber input signal, the output end of the first photoelectric conversion module and the first resistance Anti- matching module connection, the output end of the first impedance matching module are connected with the first low noise amplification module, and the first low noise is put The output end of big module is connected with the first bandpass filtering modules block, the output end of the first bandpass filtering modules block and the first High frequency amplification mould Block is connected, and the output end of the first high frequency amplifying module is connected with the first frequency mixer；
Second photoelectric conversion module receives the second external fiber input signal, the output end of the second photoelectric conversion module and the second resistance Anti- matching module connection, the output end of the second impedance matching module are connected with the second low noise amplification module, and the second low noise is put The output end of big module is connected with the second bandpass filtering modules block, the output end of the second bandpass filtering modules block and the second High frequency amplification mould Block is connected, and the output end of the second high frequency amplifying module is connected with the second frequency mixer；
The phaselocked loop voltage control output end of controller is connected with phaselocked loop, and the output end of phaselocked loop is connected with oscillator, vibration Two output ends of device are connected with the first frequency mixer and the second frequency mixer respectively, and the output end of the first frequency mixer is put with the first intermediate frequency Big module connection, the output end of the first intermediate frequency amplification module export the first intermediate-freuqncy signal, the output end of the second frequency mixer and second Intermediate frequency amplification module connects, and the output end of the second intermediate frequency amplification module exports the second intermediate-freuqncy signal；
First power detection module detects the signal magnitude on the first signal transmission path and sent to controller, the increasing of controller Beneficial control output end is connected with the first low noise amplification module, the first high frequency amplifying module and the first intermediate frequency amplification module respectively； Second power detection module detects the signal magnitude in secondary signal transmission path and sent to controller, the gain control of controller Output end processed is connected with the second low noise amplification module, the second high frequency amplifying module and the second intermediate frequency amplification module respectively；
Described method comprises the following steps：
First TV fiber-optic signal converts optical signals into electric signal by the first photoelectric conversion module, through the first impedance matching mould Suitable impedance is converted electrical signals to after block, after through the first low noise amplification module amplification and the first bandpass filtering modules block After suppressing interference, it is mixed with being controlled by a controller the local oscillation signal as caused by phaselocked loop and oscillator through the first frequency mixer, it Exported again after the amplification of the first intermediate frequency amplification module afterwards；
Second TV fiber-optic signal converts optical signals into electric signal by the second photoelectric conversion module, through the second impedance matching mould Suitable impedance is converted electrical signals to after block, after through the second low noise amplification module amplification and the second bandpass filtering modules block After suppressing interference, it is mixed with being controlled by a controller the local oscillation signal as caused by phaselocked loop and oscillator through the second frequency mixer, it Exported again after the amplification of the second intermediate frequency amplification module afterwards；
And in whole process, signal magnitude and transmission in the first power detection module detection signal transmission path extremely control Device, controller adjust the first low noise amplification module, the first high frequency amplifying module and the first intermediate frequency according to signal magnitude and amplify mould The gain of block；Signal magnitude in second power detection module detection signal transmission path is simultaneously sent to controller, controller root The gain of the second low noise amplification module, the second high frequency amplifying module and the second intermediate frequency amplification module is adjusted according to signal magnitude.
Further, described low noise amplification module includes the low-noise amplifier of two series connection.
The beneficial effects of the invention are as follows：The present invention according to actual conditions to low noise amplification module, high frequency amplifying module and The gain of intermediate frequency amplification module is adjusted, while two lines are controlled using same controller, phaselocked loop and oscillator System, economizes on resources.
Brief description of the drawings
The tuner circuit block diagram that Fig. 1 is relied on by the inventive method.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings：A kind of dual output optical fiber tuner makes With method, described tuner includes the first photoelectric conversion module, the second photoelectric conversion module, the first impedance matching module, the Two impedance matching modules, the first low noise amplification module, the second low noise amplification module, the first bandpass filtering modules block, the second band Pass filtering module, the first high frequency amplifying module, the second high frequency amplifying module, the first frequency mixer, the second frequency mixer, oscillator, lock Xiang Huan, the first intermediate frequency amplification module, the second intermediate frequency amplification module, controller, the first power detection module and the second power detection Module, the first described low noise amplification module, the second low noise amplification module, the first high frequency amplifying module, the second high frequency are put Big module, the first intermediate frequency amplification module and the second intermediate frequency amplification module are adjustable gain amplification module；
First photoelectric conversion module receives the first external fiber input signal, the output end of the first photoelectric conversion module and the first resistance Anti- matching module connection, the output end of the first impedance matching module are connected with the first low noise amplification module, and the first low noise is put The output end of big module is connected with the first bandpass filtering modules block, the output end of the first bandpass filtering modules block and the first High frequency amplification mould Block is connected, and the output end of the first high frequency amplifying module is connected with the first frequency mixer；
Second photoelectric conversion module receives the second external fiber input signal, the output end of the second photoelectric conversion module and the second resistance Anti- matching module connection, the output end of the second impedance matching module are connected with the second low noise amplification module, and the second low noise is put The output end of big module is connected with the second bandpass filtering modules block, the output end of the second bandpass filtering modules block and the second High frequency amplification mould Block is connected, and the output end of the second high frequency amplifying module is connected with the second frequency mixer；
The phaselocked loop voltage control output end of controller is connected with phaselocked loop, and the output end of phaselocked loop is connected with oscillator, vibration Two output ends of device are connected with the first frequency mixer and the second frequency mixer respectively, and the output end of the first frequency mixer is put with the first intermediate frequency Big module connection, the output end of the first intermediate frequency amplification module export the first intermediate-freuqncy signal, the output end of the second frequency mixer and second Intermediate frequency amplification module connects, and the output end of the second intermediate frequency amplification module exports the second intermediate-freuqncy signal；
First power detection module detects the signal magnitude on the first signal transmission path and sent to controller, the increasing of controller Beneficial control output end is connected with the first low noise amplification module, the first high frequency amplifying module and the first intermediate frequency amplification module respectively； Second power detection module detects the signal magnitude in secondary signal transmission path and sent to controller, the gain control of controller Output end processed is connected with the second low noise amplification module, the second high frequency amplifying module and the second intermediate frequency amplification module respectively；
Described method comprises the following steps：
First TV fiber-optic signal converts optical signals into electric signal by the first photoelectric conversion module, through the first impedance matching mould Suitable impedance is converted electrical signals to after block, after through the first low noise amplification module amplification and the first bandpass filtering modules block After suppressing interference, it is mixed with being controlled by a controller the local oscillation signal as caused by phaselocked loop and oscillator through the first frequency mixer, it Exported again after the amplification of the first intermediate frequency amplification module afterwards；
Second TV fiber-optic signal converts optical signals into electric signal by the second photoelectric conversion module, through the second impedance matching mould Suitable impedance is converted electrical signals to after block, after through the second low noise amplification module amplification and the second bandpass filtering modules block After suppressing interference, it is mixed with being controlled by a controller the local oscillation signal as caused by phaselocked loop and oscillator through the second frequency mixer, it Exported again after the amplification of the second intermediate frequency amplification module afterwards；
And in whole process, signal magnitude and transmission in the first power detection module detection signal transmission path extremely control Device, controller adjust the first low noise amplification module, the first high frequency amplifying module and the first intermediate frequency according to signal magnitude and amplify mould The gain of block；Signal magnitude in second power detection module detection signal transmission path is simultaneously sent to controller, controller root The gain of the second low noise amplification module, the second high frequency amplifying module and the second intermediate frequency amplification module is adjusted according to signal magnitude.
More preferably, in the present embodiment, described low noise amplification module includes the low-noise amplifier of two series connection.
The present invention is described by embodiment, but is not limited the invention, with reference to description of the invention, institute Other changes of disclosed embodiment, are such as readily apparent that, such change should belong to for the professional person of this area Within the scope of the claims in the present invention limit.

Claims (2)

  1. A kind of 1. application method of dual output optical fiber tuner, it is characterised in that：Described tuner turns including the first photoelectricity Change the mold block, the second photoelectric conversion module, the first impedance matching module, the second impedance matching module, the first low noise amplification module, It is second low noise amplification module, the first bandpass filtering modules block, the second bandpass filtering modules block, the first high frequency amplifying module, second high Frequency amplification module, the first frequency mixer, the second frequency mixer, oscillator, phaselocked loop, the first intermediate frequency amplification module, the amplification of the second intermediate frequency Module, controller, the first power detection module and the second power detection module, the first described low noise amplification module, second Low noise amplification module, the first high frequency amplifying module, the second high frequency amplifying module, the first intermediate frequency amplification module and the second intermediate frequency are put Big module is adjustable gain amplification module；
    First photoelectric conversion module receives the first external fiber input signal, the output end of the first photoelectric conversion module and the first resistance Anti- matching module connection, the output end of the first impedance matching module are connected with the first low noise amplification module, and the first low noise is put The output end of big module is connected with the first bandpass filtering modules block, the output end of the first bandpass filtering modules block and the first High frequency amplification mould Block is connected, and the output end of the first high frequency amplifying module is connected with the first frequency mixer；
    Second photoelectric conversion module receives the second external fiber input signal, the output end of the second photoelectric conversion module and the second resistance Anti- matching module connection, the output end of the second impedance matching module are connected with the second low noise amplification module, and the second low noise is put The output end of big module is connected with the second bandpass filtering modules block, the output end of the second bandpass filtering modules block and the second High frequency amplification mould Block is connected, and the output end of the second high frequency amplifying module is connected with the second frequency mixer；
    The phaselocked loop voltage control output end of controller is connected with phaselocked loop, and the output end of phaselocked loop is connected with oscillator, vibration Two output ends of device are connected with the first frequency mixer and the second frequency mixer respectively, and the output end of the first frequency mixer is put with the first intermediate frequency Big module connection, the output end of the first intermediate frequency amplification module export the first intermediate-freuqncy signal, the output end of the second frequency mixer and second Intermediate frequency amplification module connects, and the output end of the second intermediate frequency amplification module exports the second intermediate-freuqncy signal；
    First power detection module detects the signal magnitude on the first signal transmission path and sent to controller, the increasing of controller Beneficial control output end is connected with the first low noise amplification module, the first high frequency amplifying module and the first intermediate frequency amplification module respectively； Second power detection module detects the signal magnitude in secondary signal transmission path and sent to controller, the gain control of controller Output end processed is connected with the second low noise amplification module, the second high frequency amplifying module and the second intermediate frequency amplification module respectively；
    Described method comprises the following steps：
    First TV fiber-optic signal converts optical signals into electric signal by the first photoelectric conversion module, through the first impedance matching mould Suitable impedance is converted electrical signals to after block, after through the first low noise amplification module amplification and the first bandpass filtering modules block After suppressing interference, it is mixed with being controlled by a controller the local oscillation signal as caused by phaselocked loop and oscillator through the first frequency mixer, it Exported again after the amplification of the first intermediate frequency amplification module afterwards；
    Second TV fiber-optic signal converts optical signals into electric signal by the second photoelectric conversion module, through the second impedance matching mould Suitable impedance is converted electrical signals to after block, after through the second low noise amplification module amplification and the second bandpass filtering modules block After suppressing interference, it is mixed with being controlled by a controller the local oscillation signal as caused by phaselocked loop and oscillator through the second frequency mixer, it Exported again after the amplification of the second intermediate frequency amplification module afterwards；
    And in whole process, signal magnitude and transmission in the first power detection module detection signal transmission path extremely control Device, controller adjust the first low noise amplification module, the first high frequency amplifying module and the first intermediate frequency according to signal magnitude and amplify mould The gain of block；Signal magnitude in second power detection module detection signal transmission path is simultaneously sent to controller, controller root The gain of the second low noise amplification module, the second high frequency amplifying module and the second intermediate frequency amplification module is adjusted according to signal magnitude.
  2. A kind of 2. application method of dual output optical fiber tuner according to claim 1, it is characterised in that：Described is low Noise amplification module includes the low-noise amplifier of two series connection.
CN201711042690.7A 2017-10-31 2017-10-31 A kind of application method of dual output optical fiber tuner Withdrawn CN107707961A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711042690.7A CN107707961A (en) 2017-10-31 2017-10-31 A kind of application method of dual output optical fiber tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711042690.7A CN107707961A (en) 2017-10-31 2017-10-31 A kind of application method of dual output optical fiber tuner

Publications (1)

Publication Number Publication Date
CN107707961A true CN107707961A (en) 2018-02-16

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CN201711042690.7A Withdrawn CN107707961A (en) 2017-10-31 2017-10-31 A kind of application method of dual output optical fiber tuner

Country Status (1)

Country Link
CN (1) CN107707961A (en)

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Application publication date: 20180216

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