CN202798787U - HFC (High-frequency Current) webmaster signaling modulator-demodulator based on FSK (Frequency Shift Keying) modulation technique - Google Patents
HFC (High-frequency Current) webmaster signaling modulator-demodulator based on FSK (Frequency Shift Keying) modulation technique Download PDFInfo
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- CN202798787U CN202798787U CN 201220385315 CN201220385315U CN202798787U CN 202798787 U CN202798787 U CN 202798787U CN 201220385315 CN201220385315 CN 201220385315 CN 201220385315 U CN201220385315 U CN 201220385315U CN 202798787 U CN202798787 U CN 202798787U
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Abstract
The utility model discloses an HFC webmaster signaling modulator-demodulator based on FSK modulation technique , which comprises a control module, a radio-frequency receiving module and a radio-frequency transmitting module, wherein the radio-frequency receiving module receives a radio-frequency FSK modulation signal from an HFC network and demodulates the signal as a base band serial signal; the radio-frequency transmitting module sends the base band serial signal to the HFC network after the base band serial signal is modulated by the FSK; the control module detects an MAC (Media Access Control) layer command of 'HFC Network Equipment Management System Standard', changes uplink and downlink working frequency points according to the command and provides a cascading port so as to facilitate the cascading of a plurality of modulator-demodulators for expanding the application range. The HFC webmaster signaling modulator-demodulator based on the FSK modulation technique has the advantages that: one downlink radio-frequency output port and eight post-back radio-frequency input interfaces are provided; the radio-frequency receiving module and the radio-frequency transmitting module adopt modularized design so as to facilitate the replacement and maintenance; and a communication cascading unit is arranged internally so that a plurality of webmaster signaling modulator-demodulators can be cascaded to support more uplink post-back passages to input signals.
Description
Technical field
The utility model relates to radio, TV and film industries monitoring of tools field, specifically a kind of HFC webmaster signaling modulation demodulator based on the FSK modulation technique.
Background technology
In the broadcasting and TV field, hfc plant (Hybrid Fiber Coax Hybrid Fiber and Coax Network HFC) is generally used at present, based on the hfc plant bidirectional rebuilding develop rapidly of RF return, cable network company in various places widelys popularize that Cable Modem uses and based on this various value-added services.Therefore, along with the development of business, guarantee that the reliable operation maintenance of hfc plant has obtained great attention.
At present, promulgation along with national standard " hfc plant equipment management system standard ", monitoring to the hfc plant equipment of RF return provides method, monitoring to field equipment has corresponding network management data collector, at front end, then need front controller and the communication of network management data collector with construction system.
Summary of the invention
The purpose of this utility model is the application in view of the field equipment network management system of RF return, provide a kind of foundation " hfc plant equipment management system standard " design standard hardware and software platform to carry out the Apparatus and method for of remote monitoring, a kind of HFC webmaster signaling modulation demodulator based on the FSK modulation technique particularly, can realize and different manufacturers field equipment network management data collector between interconnection and interflow.
According to the technical scheme that the utility model provides, described HFC webmaster signaling modulation demodulator based on the FSK modulation technique comprises: control module, Receiver Module, radio frequency sending module; Described control module comprises main control MCU, phase-locked loop, communication cascade unit, reception phase-locked loop Signal Matching circuit, digital signal synthesis circuit, sends phase-locked loop Signal Matching circuit; Main control MCU links to each other with phase-locked loop, phase-locked loop connects respectively reception phase-locked loop Signal Matching circuit and sends phase-locked loop Signal Matching circuit, receiving phase-locked loop Signal Matching circuit links to each other with one or more Receiver Modules, sending phase-locked loop Signal Matching circuit links to each other with the radio frequency sending module, main control MCU is also distinguished connecting communication cascade unit and radio frequency sending module, the input of digital signal synthesis circuit connects described Receiver Module, the output connecting communication cascade unit of digital signal synthesis circuit; Communication cascade unit externally connects the front end communication machine, and described Receiver Module and radio frequency sending module are connected to hfc plant.By described communication cascade unit a plurality of HFC webmaster signaling modulation demodulator stage are linked up.
Described Receiver Module comprises: the first band pass filter, signal amplification circuit, the second band pass filter, FSK demodulation module, software filtering MCU, described software filtering MCU are used for that the upstream data bag that receives is resolved filtering noise to be disturbed and the radio-frequency channel abnormal data; The output of the first band pass filter is connected to signal amplification circuit, the output of signal amplification circuit is connected to the second band pass filter, the output of the second band pass filter is connected to the FSK demodulation module, and the digital signal that the FSK demodulation module demodulates is exported the serial ports receiving digital signals after being connected to software filtering MCU.
Described radio frequency sending module comprises: vco bank, pre-biased circuit, low pass filter, level control circuit, the 3rd band pass filter, time-delay automatic shutdown circuitry; Serial ports sends the input that digital signal is connected to pre-biased circuit, the output of pre-biased circuit is connected to vco bank, the output of vco bank is connected to low pass filter, the input of level control circuit connects respectively low pass filter and time-delay automatic shutdown circuitry, the output of level control circuit is connected to the 3rd band pass filter, and the output of the 3rd band pass filter is connected to hfc plant.
Described control module is connected with 8 Receiver Modules and a radio frequency sending module, independently of one another isolation between 8 Receiver Modules and the radio frequency sending module.
Described Receiver Module receives the radio frequency fsk modulated signal from hfc plant, is demodulated to the base band serial signal; Described radio frequency sending module sends to hfc plant after the base band serial signal is modulated through FSK; Described control module detects the MAC layer order CHNLDESC of " hfc plant equipment management system standard " and changes in real time the uplink and downlink works frequency according to this order, provides the cascade port to be convenient to a plurality of modulator-demodulator cascades and comes the expanded application scope.
The utility model has the advantages that: the utility model provides 1 downlink radio frequency output interface, 8 passback rf input interfaces, and Receiver Module and radio frequency sending module adopt modularized design, are convenient to change safeguard; The more up return path input signal of multichannel can be supported by a plurality of webmaster signaling modulation of cascade demodulator in built-in communication cascade unit; Receiver Module adopts the mode of software filtering, reduces the interference of radio-frequency channel noise, reduces the communication error rate.
Description of drawings
Fig. 1 is a classical group anastomose composition of the utility model webmaster signaling modulation demodulator.
Fig. 2 is the hardware block diagram of the utility model webmaster signaling modulation demodulator.
Fig. 3 is the Receiver Module theory diagram.
Fig. 4 is radio frequency sending module theory diagram.
Fig. 5 is the Receiver Module program flow diagram.
Fig. 6 is Receiver Module serial ports interrupt function flow chart.
Fig. 7 is the control module program flow diagram.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
The HFC webmaster signaling modulation demodulator based on the FSK modulation technique that the utility model is realized, its hardware components comprises control module 106, Receiver Module 107, radio frequency sending module 108; Main control MCU on the control module 106 (microprocessor) working procedure drives operating frequency and the indicating equipment operating state that phase-locked loop is set the up-downgoing channel, main control MCU permission program is come receive data is carried out software filtering on the Receiver Module 107, the data that filtering is invalid.
Be illustrated in figure 1 as the utility model implementation based on a classical group anastomose composition of the network management system of RF return, it comprises 112, one typical hfc plants 110 of at least one headend front controller, at least one data acquisition unit 111.Front controller 112 comprises front end communication machine 109 and modulator-demodulator 105 at least.Webmaster signaling modulation demodulator 105 of the present utility model comprises control module 106, Receiver Module 107, radio frequency sending module 108 at least, and the three connects successively.Receiver Module 106 receives from the fsk signal of hfc plant and is demodulated into the base band serial digital signal, and radio frequency sending module 108 is modulated to fsk signal with the base band serial digital signal and sends in the hfc plant.
As shown in Figure 2, HFC webmaster signaling modulation demodulator 105 described in the utility model comprises: control module 106,8 Receiver Modules 107,1 radio frequency sending module 108 form 1 descending transmission radio frequency output of independent isolating, the structure of 8 up radio frequency inputs.Receiver Module 107 and radio frequency sending module 108 carry out modularized design, are convenient to safeguard replace; Control module 106 is core components of webmaster signaling modulation demodulator 105, comprises main control MCU 213, phase-locked loop pll 214, display unit 215, communication cascade unit 216, receives phase-locked loop Signal Matching circuit 217, digital signal synthesis circuit 218, sends phase-locked loop Signal Matching circuit 219.Main control MCU 213 links to each other with phase-locked loop 214, phase-locked loop 214 connects respectively reception phase-locked loop Signal Matching circuit 217 and sends phase-locked loop Signal Matching circuit 219, receiving phase-locked loop Signal Matching circuit 217 links to each other with one or more Receiver Modules 107, sending phase-locked loop Signal Matching circuit 219 links to each other with radio frequency sending module 108, main control MCU 213 is also distinguished connecting communication cascade unit 216 and radio frequency sending module 108, the input of digital signal synthesis circuit 218 connects described Receiver Module 107, the output connecting communication cascade unit 216 of digital signal synthesis circuit 218; Communication cascade unit 216 externally connects the front end communication machine, and described Receiver Module 107 and radio frequency sending module 108 are connected to hfc plant.Main control MCU 213 receives from front end communication machine serial transmitted signal, parse the CHNLDESC order of MAC layer, order to drive phase-locked loop pll 214 output two-way lockin signals according to this and supply with respectively Receiver Module 107 and radio frequency sending module 108, receiving phase-locked loop Signal Matching circuit 217 and sending phase-locked loop Signal Matching circuit 219 provides Signal Matching and noise suppressed to this two-way lockin signal respectively; A plurality of webmaster signaling modulation demodulator stage can be linked up by communication cascade unit 216, can support the signal input of how up the loop of rf, for the flexible Application of system brings convenience.
The Receiver Module 107 of the utility model webmaster signaling modulation demodulator comprises as shown in Figure 3: the first band pass filter 320, signal amplification circuit 321, the second band pass filter 322, FSK demodulation module 323, software filtering MCU327, described software filtering MCU327 are used for that the upstream data bag that receives is resolved filtering noise to be disturbed and the radio-frequency channel abnormal data; The output of the first band pass filter 320 is connected to signal amplification circuit 321, the output of signal amplification circuit 321 is connected to the second band pass filter 322, the output of the second band pass filter 322 is connected to FSK demodulation module 323, and the digital signal that FSK demodulation module 323 demodulates is exported the serial ports receiving digital signals after being connected to software filtering MCU327.After the conditionings such as filter and amplification of the radiofrequency signal that receives through band pass filter 1BPF, signal amplification circuit 321, band pass filter 2BPF, give FSK demodulation module 323, FSK demodulation module 323 is demodulated into serial digital signal to software filtering MCU327 with the radiofrequency signal that receives.Described software filtering MCU327 resolves by the critical field of the digital signal that receives being carried out mac-layer protocol, the data that will meet the mac-layer protocol standard are upwards transmitted, the data that are not inconsistent are then abandoned, but the most data error code of filtering, the anti-radio noise of system and the ability of channel disturbance are provided, improve the reliability of system.
The radio frequency sending module 108 that is illustrated in figure 4 as the utility model webmaster signaling modulation demodulator comprises: vco bank 428, pre-biased circuit 429, low pass filter 430, level control circuit 431, the 3rd band pass filter 432, time-delay automatic shutdown circuitry 433; Serial ports sends the input that digital signal is connected to pre-biased circuit 429, the output of pre-biased circuit 429 is connected to vco bank 428, the output of vco bank 428 is connected to low pass filter 430, the input of level control circuit 431 connects respectively low pass filter 430 and time-delay automatic shutdown circuitry 433, the output that the output of level control circuit 431 is connected to the 3rd band pass filter 432, the three band pass filters 432 is connected to hfc plant.The serial ports of input sends digital signal and pass to voltage controlled oscillator VCO group 428 behind pre-biased circuit 429, voltage controlled oscillator VCO group 428 and phase-locked loop pll signal composition closed network are modulated digital signal and are become radiofrequency signal, low pass filter LPF 430 and band pass filter BPF432 carry out filtering to radiofrequency signal to be processed, 431 pairs of level of RF signals of level control circuit amplify or attenuation processing, can send to hfc plant through the radiofrequency signal after the conditioning.But automatic forced turn-offs transmitted signal behind the time-delay automatic shutdown circuitry 433 time-delay certain hours, and the channel communication of network management system is carried out reliably protecting.
Software program is to design and carry out according to the mac-layer protocol in " hfc plant equipment management system standard ", and the MAC layer has been stipulated the form of packet: comprise SYNCH(synchronization field 0xA5), the CONTROL(control field), the ADDRESS(address), the SEQUENCE(sequence field), the LENGTH(length field), the PAYLOAD(payload), the FCS(check field); Mac-layer protocol has also defined orders CHNLDESC that the operating frequency of uplink and downlink channel is set.
Be illustrated in figure 5 as the program flow diagram of Receiver Module of the present utility model.The function ratio of this software is more single, and its mechanism is whether judge to send the pointer of buffer memory consistent, inconsistently then data is upwards sent to control module 106.
Be illustrated in figure 6 as the serial ports interrupt function flow chart of Receiver Module of the present utility model.In interrupt function, the critical fielies such as SYNCH, the CONTROL of MAC agreement, LENGTH are carried out dissection process, if these several critical fielies of the packet that receives be correct then store packet into the transmission buffer memory, otherwise abandon packet.
Be illustrated in figure 7 as the control module program flow diagram of the utility model net.Its function is the mac-layer protocol order that receives from front end communication machine 109, therefrom find out the CHNLDESC order, drive adjusting phase-locked loop (PLL) 214 by the up-downgoing channel operating frequency in this order, reset the working frequency points of Receiver Module and radio frequency sending module.
Claims (5)
1. based on the HFC webmaster signaling modulation demodulator of FSK modulation technique, it is characterized in that: comprise control module (106), Receiver Module (107), radio frequency sending module (108); Described control module (106) comprises main control MCU (213), phase-locked loop (214), communication cascade unit (216), receives phase-locked loop Signal Matching circuit (217), digital signal synthesis circuit (218), sends phase-locked loop Signal Matching circuit (219); Main control MCU (213) links to each other with phase-locked loop (214), phase-locked loop (214) connects respectively reception phase-locked loop Signal Matching circuit (217) and sends phase-locked loop Signal Matching circuit (219), receiving phase-locked loop Signal Matching circuit (217) links to each other with one or more Receiver Modules (107), sending phase-locked loop Signal Matching circuit (219) links to each other with radio frequency sending module (108), main control MCU (213) is also distinguished connecting communication cascade unit (216) and radio frequency sending module (108), the input of digital signal synthesis circuit (218) connects described Receiver Module (107), the output connecting communication cascade unit (216) of digital signal synthesis circuit (218); Communication cascade unit (216) externally connects the front end communication machine, and described Receiver Module (107) and radio frequency sending module (108) are connected to hfc plant.
2. as claimed in claim 1 based on the HFC webmaster signaling modulation demodulator of FSK modulation technique, it is characterized in that, by described communication cascade unit (216) a plurality of HFC webmaster signaling modulation demodulator stage are linked up.
3. as claimed in claim 1 based on the HFC webmaster signaling modulation demodulator of FSK modulation technique, it is characterized in that described Receiver Module (107) comprising: the first band pass filter (320), signal amplification circuit (321), the second band pass filter (322), FSK demodulation module (323), software filtering MCU(327), described software filtering MCU(327) be used for the upstream data bag that receives is resolved filtering noise interference and radio-frequency channel abnormal data; The output of the first band pass filter (320) is connected to signal amplification circuit (321), the output of signal amplification circuit (321) is connected to the second band pass filter (322), the output of the second band pass filter (322) is connected to FSK demodulation module (323), and the digital signal that FSK demodulation module (323) demodulates is connected to software filtering MCU(327) rear output serial ports receiving digital signals.
4. as claimed in claim 1 based on the HFC webmaster signaling modulation demodulator of FSK modulation technique, it is characterized in that described radio frequency sending module (108) comprising: vco bank (428), pre-biased circuit (429), low pass filter (430), level control circuit (431), the 3rd band pass filter (432), time-delay automatic shutdown circuitry (433); Serial ports sends the input that digital signal is connected to pre-biased circuit (429), the output of pre-biased circuit (429) is connected to vco bank (428), the output of vco bank (428) is connected to low pass filter (430), the input of level control circuit (431) connects respectively low pass filter (430) and time-delay automatic shutdown circuitry (433), the output of level control circuit (431) is connected to the 3rd band pass filter (432), and the output of the 3rd band pass filter (432) is connected to hfc plant.
5. as claimed in claim 1 based on the HFC webmaster signaling modulation demodulator of FSK modulation technique, it is characterized in that described control module (106) is connected with 8 Receiver Modules (107) and a radio frequency sending module (108), independently of one another isolation between 8 Receiver Modules (107) and the radio frequency sending module (108).
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| CN 201220385315 CN202798787U (en) | 2012-08-03 | 2012-08-03 | HFC (High-frequency Current) webmaster signaling modulator-demodulator based on FSK (Frequency Shift Keying) modulation technique |
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| CN 201220385315 CN202798787U (en) | 2012-08-03 | 2012-08-03 | HFC (High-frequency Current) webmaster signaling modulator-demodulator based on FSK (Frequency Shift Keying) modulation technique |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105828217A (en) * | 2016-05-20 | 2016-08-03 | 湖南奥科网络技术股份有限公司 | Internet bidirectional response system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105828217A (en) * | 2016-05-20 | 2016-08-03 | 湖南奥科网络技术股份有限公司 | Internet bidirectional response system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20210803 |