CN103312905B - OFDM technology power of alterating and direct current thread industrial call site network and the means of communication of call can be broadcasted - Google Patents
OFDM technology power of alterating and direct current thread industrial call site network and the means of communication of call can be broadcasted Download PDFInfo
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- CN103312905B CN103312905B CN201310072974.6A CN201310072974A CN103312905B CN 103312905 B CN103312905 B CN 103312905B CN 201310072974 A CN201310072974 A CN 201310072974A CN 103312905 B CN103312905 B CN 103312905B
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Abstract
The present invention relates to one and be easy to expansion, facilitate networking, the industry spot telephone network that call function is powerful and the means of communication.The present invention can broadcast OFDM technology power of alterating and direct current thread industrial call site network and the means of communication of call, comprise power of alterating and direct current line, also comprise some OFDM technology power of alterating and direct current thread industrial call site machines of broadcasting call, be connected in parallel on power of alterating and direct current line; Above-mentioned telephone set comprises keyboard, arranges my phone numbers by keyboard; Above-mentioned telephone set comprises handle, and handle is provided with broadcast key, can close the machine power amplifier, open on network that other can broadcast the OFDM technology power of alterating and direct current thread industrial call site machine power amplifier of call, conversed by speaker announcement after pressing broadcast key.Beneficial effect of the present invention: broadcast capability, every portion phone by handle or microphone to whole Web broadcast; Alarm function, after opening alarm contact, whole network all gives the alarm sound.
Description
The present invention relates to industry spot telephone network, be specifically related to OFDM technology power of alterating and direct current thread industrial call site network and the means of communication that can broadcast call.
Background technology
At harbour, mine, the field such as oil field, because equipment is huge, region is spacious, and equipment work, maintenance need each post to coordinate, can information transmission smooth and easyly directly have influence on safety, the efficiency of production, and therefore device fabrication producer, applying unit are all paid much attention to.In recent years, after equipment uses inversion, converter technique, communication reliability is subject to the threat of strong electromagnetic especially, and for suppressing electromagnetic interference, usual signal adopts the transmission of shield technology, balancing technique, and both added cost, effect is undesirable again.Particularly speech communication, needs tripartite or MPTY, adopts analog form for many years always, and when equipment runs, signal to noise ratio is very little, and voice is submerged in noise, and people have to find new technology, new method.
Domestic equipment telephone set mostly is foreign imitation like product many years ago, backward in technique, and use in some strong jamming application scenarios, hypofunction, even cannot use.Be analog communication between phone, to circuit distance sensitive, basic need debugging during installation, line impedance is not mated directly affects call.Line arrangement is required strict, during plant maintenance, change ground connection or shiftable haulage line position, just likely scurry into interference, thus affect speech quality.High to cable needs, be generally 4 or 5 core shielding conductors, wiring cost is high.Phone has main frame, dividing from machine, and what have needs switch.
OFDM (OFDM) is a kind of special multi-carrier transmission scheme, and it can be counted as a kind of modulation technique, also can be counted as a kind of multiplex technique.The great advantage of OFDM technology is contrary frequency Selective intensity or arrowband interference, turn improves the availability of frequency spectrum simultaneously.OFDM technology is actually the one of MCM (multi-carrier modulation).Its main thought is that channel is divided into some orthogonal sub-channels, high-speed data signal is converted to parallel low speed sub data flow, is modulated on every sub-channels and transmits.Orthogonal signalling by adopting correlation technique to separate at receiving terminal, can reduce the mutual interference (ICI) between subchannel like this.Signal bandwidth on every sub-channels is less than the correlation bandwidth of channel, and the flatness of can regarding as therefore on every sub-channels declines, thus can eliminate intersymbol interference.And due to the bandwidth of every sub-channels be only the sub-fraction of former channel width, channel equalization becomes relatively easy.
Industry spot telephone set field GAI-TRONICS company (http://gai-tronics.com.cn) product most is representative, and GAI-TRONICS system is mutual by switching center, for the equipment of narrow space, installs inconvenient." OFDM Modern for Power Line Carrier based on DSP " (EDNchina magazine) discloses digital signal processor as the application of OFDM modulation demodulator in power line carrier; The MAX2990 chip of MAXIM company discloses a kind of 10kHz to 490kHz, power line communication modem based on OFDM, but can broadcast the OFDM technology power of alterating and direct current thread industrial call site machine of call, and network and the means of communication have no report.
Summary of the invention
The object of the invention is, provide one to be easy to expansion, facilitate networking, call function is powerful, particularly can broadcast the industry spot telephone network of call.The fields such as the present invention can be applicable at harbour, mine, oil field.
Of the present invention again one object be that a kind of means of communication broadcasting the OFDM technology power of alterating and direct current thread industrial call site network of call are provided.
For achieving the above object, the technical scheme that the present invention takes is: the OFDM technology power of alterating and direct current thread industrial call site network can broadcasting call, comprise power of alterating and direct current line, also comprise some OFDM technology power of alterating and direct current thread industrial call site machines of broadcasting call, be connected in parallel on power of alterating and direct current line; The OFDM technology power of alterating and direct current thread industrial call site machine can broadcasting call comprises keyboard, arranges my phone numbers by keyboard; The OFDM technology power of alterating and direct current thread industrial call site machine can broadcasting call comprises handle, handle is provided with broadcast key, the machine power amplifier can be closed after pressing broadcast key, open on network that other can broadcast the OFDM technology power of alterating and direct current thread industrial call site machine power amplifier of call, conversed by speaker announcement.
Preferred technical scheme can broadcast the OFDM technology power of alterating and direct current thread industrial call site machine of call and alarm and two is one, namely above-mentioned keyboard is provided with alarm keys, push for emergency after key, all power amplifiers of broadcasting the OFDM technology power of alterating and direct current thread industrial call site machine of call on network can be opened, send alarm sound by loud speaker.
For realizing above-mentioned second object, the technical scheme that the present invention takes is: the means of communication can broadcasting the OFDM technology power of alterating and direct current thread industrial call site network of call, Frame by multicast telephone number or destination phone numbers as called phone number, with my phone numbers as calling telephone number, by a data frame data length as data length byte, with hook-up command, broadcasting command, Dial Number command, the busy order of line or alarm command are as command byte, by open mode, closed condition, speech data state is as Link State byte, with speech data as data segment, by 32 CRC check as check byte, comprise the method for the OFDM technology power of alterating and direct current thread industrial call site Web broadcast call by call can be broadcasted, comprise the following steps:
Broadcast key is pinned after caller phone machine off-hook, close power amplifier, sending called phone number is broadcasting call number, and calling telephone number is my phone numbers, command byte data are broadcasting commands, and Link State byte data is the step of the Frame of speech data state;
Open power amplifier after other OFDM technology power of alterating and direct current thread industrial call site machines can broadcasting call receive above-mentioned Frame on the OFDM technology power of alterating and direct current thread industrial call site network can broadcasting call, receive the step of broadcast call;
OFDM technology power of alterating and direct current thread industrial call site machines timing that on the OFDM technology power of alterating and direct current thread industrial call site network can broadcasting call, other can broadcast call is closed and is accepted broadcast state, and closes the step of power amplifier;
After caller phone machine unclamps broadcast key, above-mentioned acceptance before broadcast state closes, enters the step of MPTY state after arbitrary other can broadcast the OFDM technology power of alterating and direct current thread industrial call site machine off-hook of call.
Preferred technical scheme comprises the method for the OFDM technology power of alterating and direct current thread industrial call site network alarming by broadcasting call, comprises the following steps:
Pin alarm keys after caller phone machine off-hook, open power amplifier, sending called phone number is broadcasting call number, and calling telephone number is my phone numbers, and command byte data are alarm commands, and Link State byte data is the step of the Frame of open mode;
Open power amplifier after the OFDM technology power of alterating and direct current thread industrial call site machine can broadcasting the calls broadcasted all on the OFDM technology power of alterating and direct current thread industrial call site network of call receives above-mentioned Frame, send the step of alarm sound;
OFDM technology power of alterating and direct current thread industrial call site machines timing that on the OFDM technology power of alterating and direct current thread industrial call site network can broadcasting call, other can broadcast call is closed and is accepted broadcast state, and closes the step of power amplifier.
The present invention has following beneficial effect: broadcast capability, every portion phone by handle or microphone to whole Web broadcast; Dial feature, every portion phone, by other phones in keyboard calling system, realizes point-to-point call, and maintains secrecy to other phones; Alarm function, after opening alarm contact, whole network all gives the alarm sound; MPTY, can carry out MPTY between multi-section phone; Network is without switch.
Accompanying drawing explanation
Fig. 1 is the described OFDM technology power of alterating and direct current thread industrial call site machine principle schematic broadcasting call.
Fig. 2 is described OFDM technology power of alterating and direct current thread industrial call site machine signal coupling circuit schematic diagram of broadcasting call.
Fig. 3 is described OFDM technology power of alterating and direct current thread industrial call site network topology structure schematic diagram of broadcasting call.
Fig. 4 is described means of communication broadcast and alarm method flow chart of broadcasting the OFDM technology power of alterating and direct current thread industrial call site network of call.
Fig. 5 is the described point-to-point call method flow chart of the means of communication of broadcasting the OFDM technology power of alterating and direct current thread industrial call site network of call.
Fig. 6 is described means of communication multiside calling method flow chart of broadcasting the OFDM technology power of alterating and direct current thread industrial call site network of call.
Fig. 7 is described OFDM technology power of alterating and direct current thread industrial call site network test winding diagram of broadcasting call.
Embodiment
Below in conjunction with embodiment, also with reference to accompanying drawing, the invention will be further described.
The OFDM technology power of alterating and direct current thread industrial call site machine principle schematic of call can be broadcasted described in accompanying drawing 1, the Reference numeral wherein related to and part as follows:
01. power of alterating and direct current line 02. signal coupling circuit
03.EMI/EMC suppresses circuit 04.OFDM modulator-demodulator
05. multimedia microprocessor 51. core processing module
52. audio compression module 53.ADC modules
54. audio decompression module 54. frequency mixing module
55.DAC module 06. keyboard
61. alarm keys 07. displays
Key broadcasted by 08. handle 81.
09. headset 10. power amplifier
11. loud speakers
Embodiment 1, by OFDM carrier system signal madulation in +/-24V DC power supply, realize the exchanges data between phone, namely power of alterating and direct current line 01 is +/-24V direct current supply line.Through surge and short-circuit protection circuit after power of alterating and direct current line 01; by fuse (or resettable fuse); 36V transient voltage protection pipe (TVS) forms, and when magnitude of voltage is more than TVS puncture voltage, TVS clamps down at 36V; the each device in protection rear end is within the scope of safe voltage; if the high pressure duration is long, TVS damages, fuse action; telephone set detachment system, ensures loss reduction.When telephone set have shorted devices or electric current excessive, fuse is action also, telephone set detachment system, ensure system worked well.
Fig. 2 is described OFDM technology power of alterating and direct current thread industrial call site machine signal coupling circuit schematic diagram of broadcasting call.
21. coupling capacitance 22. high-frequency coupling transformers
Signal coupling circuit, comprise coupling capacitance 21, high-frequency coupling transformer 22, the negative terminal of power of alterating and direct current line 01 and high-frequency coupling transformer 22 connect after output and the anode of power of alterating and direct current line exports and coupling capacitance 21 is in parallel, be power based on the alternating current-direct current industry spot telephone set of OFDM technology by EMI/EMC suppression circuit 03.Because high-frequency coupling transformer 22 number of turn is less, power supply flows through the D.C. magnetic biasing that transformer produces and can ignore, and because coupling capacitance C is to back-end circuit alternating current bypass, because phone is connected in parallel, when C value is enough large, can regard all phone coupling transformers as in parallel.
Power amplifier 10 adopts the TPA3110 of TI, dual track, 15W/ sound channel, can export 25W in short-term, and BTL connects, and exports as 40W.Multimedia microcontroller 05 adopts domestic Chip Microcomputer A X series, and building honor by Zhuhai provides, 8051 kernels, one-cycle instruction, built-in DSP, USB, CRC, MII, PLL, DAC etc., 5 timers, can perform 8,16,24 bit instructions, dominant frequency to 200mHz, can survey Absorbable organic halogens work under 160mHz.Handle 08 family expenses phone shape is identical, adopts moving-coil type transmitter and receiver, and in the middle of handle 08, there is a broadcast button inner side, and handle is conversed, it is dual-purpose to broadcast, and push button and be broadcast, during call, environment is too noisy, can use broadcast, and conversion flexibly.Keyboard 06 adopts 12 key standard layouts.Display 07 adopts three 0.56 inch of seven segment digital tubes.
The voice signal of coming in from headset 09 or handle 08 is processed by multimedia microprocessor 05, modulates through OFDM modulation demodulator 04, outputs to power of alterating and direct current line 01 after signal coupling circuit signal 02 is coupled; Signal on power of alterating and direct current line 01 is input to signal coupling circuit 02, by be input to after OFDM modulation demodulator 04 demodulation multimedia microprocessor 05 process after by headset 09, handle 08 or loud speaker 11 output audio signal.
Multimedia microprocessor 05 comprises core processing module 51, audio compression module 52, audio decompression module 54, frequency mixing module 55, ADC module 53, DAC module 56, enter the audio signal of multimedia microprocessor 05 after ADC module acquires 53, compressed by audio compression module 52, through core processing module 51, export to OFDM modulation demodulator 04 after data being packed and modulate; After OFDM modulation demodulator 04 demodulation, enter the packet of multimedia microprocessor 05, unpacked by core processing module 51, decompress through audio decompression module 54, frequency mixing module 55 mixing, then convert audio signal output to through DAC module 56.
Fig. 3 is described OFDM technology power of alterating and direct current thread industrial call site network topology structure schematic diagram of broadcasting call.
01. power of alterating and direct current line 100. can broadcast the OFDM technology power of alterating and direct current thread industrial call site machine of call
The OFDM technology power of alterating and direct current thread industrial call site network of call can be broadcasted, comprise power of alterating and direct current line 01, also comprise some OFDM technology power of alterating and direct current thread industrial call site machines 100 of broadcasting call, be connected in parallel on power of alterating and direct current line 01.The OFDM technology power of alterating and direct current thread industrial call site machine 100 can broadcasting call comprises keyboard 06, arranges my phone numbers by keyboard 06.Keyboard 06 is provided with alarm keys 61, after the key 61 that pushes for emergency, can open all power amplifiers 10 of broadcasting the OFDM technology power of alterating and direct current thread industrial call site machine of call on network, send alarm sound by loud speaker 11.The OFDM technology power of alterating and direct current thread industrial call site machine 100 can broadcasting call comprises handle 08, handle 08 is provided with broadcast key 81, the machine power amplifier 10 can be closed after pressing broadcast key 81, open on network that other can broadcast the OFDM technology power of alterating and direct current thread industrial call site machine power amplifier 10 of call, broadcast call by loud speaker 11.
Following table is described means of communication Frame formation table of broadcasting the OFDM technology power of alterating and direct current thread industrial call site network of call.
In order to system is convenient to upgrading and expansion, communications protocol have employed 802.3u; Protocol format < frame period >< header >< initial separator >< data volume >< frame check >.Telephone set working procedure on network generates Frame, comprises the following steps: use multicast telephone number or destination phone numbers as called phone number; With my phone numbers as calling telephone number; By a data frame data length as data length byte; With hook-up command, broadcasting command, Dial Number command, the busy order of line or alarm command are as command byte; By open mode, closed condition, speech data state as Link State byte; With speech data as data segment; By 32 CRC check as check byte.
Fig. 4 is described means of communication broadcast and alarm method flow chart of broadcasting the OFDM technology power of alterating and direct current thread industrial call site network of call.
For realizing warning function, comprise following program: after caller phone machine off-hook, pin alarm keys, open power amplifier, sending called phone number is broadcasting call number, calling telephone number is my phone numbers, command byte data are alarm commands, and Link State byte data is the Frame of open mode; Open power amplifier after the OFDM technology power of alterating and direct current thread industrial call site machine of the calls broadcasted all on the OFDM technology power of alterating and direct current thread industrial call site network of the described call broadcasted receives above-mentioned Frame, send alarm sound; The OFDM technology power of alterating and direct current thread industrial call site machine timing of the calls broadcasted all on the OFDM technology power of alterating and direct current thread industrial call site network of the described call broadcasted is closed and is accepted broadcast state, and closes power amplifier.
In order to the OFDM technology power of alterating and direct current thread industrial call site real-time performance broadcast call function of call can be being broadcasted, comprise following program: after caller phone machine off-hook, pin broadcast key, close power amplifier, sending called phone number is broadcasting call number, calling telephone number is my phone numbers, command byte data are broadcasting commands, and Link State byte data is the Frame of speech data state; Open power amplifier after the OFDM technology power of alterating and direct current thread industrial call site machine that on the OFDM technology power of alterating and direct current thread industrial call site network of the described call broadcasted, other can broadcast call receives above-mentioned Frame, receive broadcast call; The OFDM technology power of alterating and direct current thread industrial call site machine timing of the calls broadcasted all on the OFDM technology power of alterating and direct current thread industrial call site network of the described call broadcasted is closed and is accepted broadcast state, and closes power amplifier; Caller phone machine unclamp broadcast key after, above-mentioned accept broadcast state close before, enter MPTY state after arbitrary other can broadcast the OFDM technology power of alterating and direct current thread industrial call site machine off-hook of call.
Fig. 5 is the described point-to-point call method flow chart of the means of communication of broadcasting the OFDM technology power of alterating and direct current thread industrial call site network of call.
In order to the point-to-point call function of OFDM technology power of alterating and direct current thread industrial call site real-time performance of call can be being broadcasted, comprise following program: sending called phone number after the dialing of caller phone machine is the destination phone numbers that keyboard dialing is keyed in, calling telephone number is my phone numbers, command byte data are Dial Number command, and Link State byte data is the Frame of closed condition; Called phone machine sends ring back tone after receiving above-mentioned Frame, replying caller phone machine command byte data after off-hook is hook-up command, Link State byte data is the Frame of open mode, or commands in return byte data is the busy order of line, Link State byte data is the Frame of closed condition; Calling and called telephone set byte data of giving an order is off-hook data, and Link State byte data is voice status, and data segment is that the Frame of speech data carries out point-to-point call; The telephone set of talking state dials new destination phone numbers, and new telephone set adds talking link, and multiple telephone set enters MPTY state.
Fig. 6 is described means of communication multiside calling method flow chart of broadcasting the OFDM technology power of alterating and direct current thread industrial call site network of call.
In order to the OFDM technology power of alterating and direct current thread industrial call site real-time performance MPTY function of call can be broadcasted, comprise following program: called telephone machine, according to speech detection voice size, exceedes threshold value, send speech data frame, otherwise abandon; The machine that receives calls is through address validation, if new calling telephone number, distributes new data buffer storage, if old call number uses the data buffer storage distributed; The machine that receives calls uses the speech data frame of corresponding data buffer memory receipt of call telephone set, and the corresponding timer that resets; The machine timer of receiving calls arrives, release corresponding data buffer memory.Owing to adding timer to data buffer storage, when timer is zero, data buffer storage discharges, and timer assignment is distinguished by address (telephone number), confirms assignment, therefore, when same phone timing in without Data Update time, data buffer storage writes without new data, data buffer storage discharges, thus can deallocation (telephone number), adds new phone.Telephone recording adds threshold value, and when sound is greater than-15 decibels, just have audio frequency to export, therefore when voiceless sound, data receiver phone does not receive data in timing, automatic clearing; Again access when there being data to receive.According to the custom of people, when hearing that other people speak, substantially keep listen state, namely a people says that many people listen, and when there being people to rob words, being substantially in two people and saying, many people listen state, and binding cache dynamic assignment mechanism, MPTY is still natural.
Fig. 7 is described OFDM technology power of alterating and direct current thread industrial call site network test winding diagram of broadcasting call.
Tester: two oscilloscopes, VFD-F500 frequency converter, 240V turns 12V transformer, 24V Switching Power Supply, and notebook makees 1000KHZ sound acoustic generator; The object of product test: do the interference that interference source (VFD-F500 can produce the frequency of AC220V-0HZ ~ 400HZ) produces different frequency by VFD-F500 frequency converter, whether survey the call oscillogram of DT001 before and after interference, observing call oscillogram affects call waveform by extraneous interference; Test result: under strong jamming, communication is uninfluenced, call is smooth, and sound without significant change, meets onsite application requirement when there being what thing of interference to disturb substantially.
Embodiment 2: adopt alternating current 220V power line to power, namely telephone set is connected in parallel on alternating current 220V power line; Multimedia microprocessor adopts the multimedia chip ARM Cortex-M3 of STMicw Electronics, internal USB, CRC, MII, PLL, DAC, ADC etc., and dominant frequency can to 72M; Signal coupling circuit and EMI/EMC suppress circuit to do corresponding change, to adapt to alternating current 220V power line.Other are identical with embodiment 1.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvement and supplement, these improve and supplement and also should be considered as protection scope of the present invention.
Claims (6)
1. can broadcast the OFDM technology power of alterating and direct current thread industrial call site network of call, comprise power of alterating and direct current line, also comprise some OFDM technology power of alterating and direct current thread industrial call site machines of broadcasting call, be connected in parallel on described power of alterating and direct current line; Described OFDM technology power of alterating and direct current thread industrial call site machine of broadcasting call comprises keyboard, arranges my phone numbers by keyboard; Described OFDM technology power of alterating and direct current thread industrial call site machine of broadcasting call comprises handle, it is characterized in that: described handle is provided with broadcast key, the machine power amplifier can be closed after pressing broadcast key, send the Frame that called phone number is broadcasting call number, calling telephone number is my phone numbers, command byte data are broadcasting commands, Link State byte data is speech data state, open on network that other can broadcast the OFDM technology power of alterating and direct current thread industrial call site machine power amplifier of call, conversed by speaker announcement.
2. OFDM technology power of alterating and direct current thread industrial call site network of broadcasting call according to claim 1, it is characterized in that: described keyboard is provided with alarm keys, push for emergency after key, all power amplifiers of broadcasting the OFDM technology power of alterating and direct current thread industrial call site machine of call on network can be opened, send alarm sound by loud speaker.
3. can broadcast the means of communication of the OFDM technology power of alterating and direct current thread industrial call site network of call, Frame by multicast telephone number or destination phone numbers as called phone number, with my phone numbers as calling telephone number, by a data frame data length as data length byte, with hook-up command, broadcasting command, Dial Number command, the busy order of line or alarm command as command byte, by open mode, closed condition, speech data state as Link State byte, with speech data as data segment, by 32 CRC check as check byte; Comprise the method conversed by the OFDM technology power of alterating and direct current thread industrial call site Web broadcast of the described call broadcasted, it is characterized in that comprising the following steps:
Broadcast key is pinned after caller phone machine off-hook, close power amplifier, sending called phone number is broadcasting call number, and calling telephone number is my phone numbers, command byte data are broadcasting commands, and Link State byte data is the step of the Frame of speech data state;
Open power amplifier after the OFDM technology power of alterating and direct current thread industrial call site machine that on the OFDM technology power of alterating and direct current thread industrial call site network of the described call broadcasted, other can broadcast call receives above-mentioned Frame, receive the step of broadcast call;
The OFDM technology power of alterating and direct current thread industrial call site machine timing that on the OFDM technology power of alterating and direct current thread industrial call site network of the described call broadcasted, other can broadcast call is closed and is accepted broadcast state, and closes the step of power amplifier;
After caller phone machine unclamps broadcast key, above-mentioned acceptance before broadcast state closes, enters the step of MPTY state after arbitrary other can broadcast the OFDM technology power of alterating and direct current thread industrial call site machine off-hook of call.
4. the means of communication broadcasting the OFDM technology power of alterating and direct current thread industrial call site network of call according to claim 3, comprise the method for the OFDM technology power of alterating and direct current thread industrial call site network alarming by the described call broadcasted, it is characterized in that comprising the following steps:
Pin alarm keys after caller phone machine off-hook, open power amplifier, sending called phone number is broadcasting call number, and calling telephone number is my phone numbers, and command byte data are alarm commands, and Link State byte data is the step of the Frame of open mode;
Open power amplifier after the OFDM technology power of alterating and direct current thread industrial call site machine of the calls broadcasted all on the OFDM technology power of alterating and direct current thread industrial call site network of the described call broadcasted receives above-mentioned Frame, send the step of alarm sound;
The OFDM technology power of alterating and direct current thread industrial call site machine timing that on the OFDM technology power of alterating and direct current thread industrial call site network of the described call broadcasted, other can broadcast call is closed and is accepted broadcast state, and closes the step of power amplifier.
5. the means of communication broadcasting the OFDM technology power of alterating and direct current thread industrial call site network of call according to claim 3, comprise the method for the point-to-point call of OFDM technology power of alterating and direct current thread industrial call site network by the described call broadcasted, it is characterized in that comprising the following steps:
Sending called phone number after the dialing of caller phone machine is the destination phone numbers that keyboard dialing is keyed in, and calling telephone number is my phone numbers, and command byte data are Dial Number command, and Link State byte data is the step of the Frame of closed condition;
Called phone machine sends ring back tone after receiving above-mentioned Frame, replying caller phone machine command byte data after off-hook is hook-up command, Link State byte data is the Frame of open mode, or commands in return byte data is the busy order of line, Link State byte data is the step of the Frame of closed condition;
Calling and called telephone set byte data of giving an order is off-hook data, and Link State byte data is voice status, and data segment is the step that the Frame of speech data carries out point-to-point call;
The telephone set of talking state dials new destination phone numbers, and new telephone set adds talking link, and multiple telephone set enters the step of MPTY state.
6. the means of communication of the OFDM technology power of alterating and direct current thread industrial call site network of the call broadcasted according to claim 3 or 5, comprise the method for the OFDM technology power of alterating and direct current thread industrial call site network MPTY by the described call broadcasted, it is characterized in that comprising the following steps:
Called telephone machine, according to speech detection voice size, exceedes threshold value, sends speech data frame, otherwise the step abandoned;
The machine that receives calls is through address validation, if new calling telephone number, distributes new data buffer storage, if old call number uses the step of the data buffer storage distributed;
The machine that receives calls uses the speech data frame of corresponding data buffer memory receipt of call telephone set, and the step of the corresponding timer that resets;
The machine timer of receiving calls arrives, the step of release corresponding data buffer memory.
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| CN201310072974.6A CN103312905B (en) | 2010-11-22 | 2010-11-22 | OFDM technology power of alterating and direct current thread industrial call site network and the means of communication of call can be broadcasted |
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|---|---|---|---|
| CN2010105564182A CN102111513A (en) | 2010-11-22 | 2010-11-22 | Industrial on-site telephone network of alternating current/ direct current power line based on OFDM (Orthogonal Frequency Division Multiplexing) technology and communication method thereof |
| CN201310072974.6A CN103312905B (en) | 2010-11-22 | 2010-11-22 | OFDM technology power of alterating and direct current thread industrial call site network and the means of communication of call can be broadcasted |
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| CN2010105564182A Division CN102111513A (en) | 2010-11-22 | 2010-11-22 | Industrial on-site telephone network of alternating current/ direct current power line based on OFDM (Orthogonal Frequency Division Multiplexing) technology and communication method thereof |
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| CN201310072974.6A Active CN103312905B (en) | 2010-11-22 | 2010-11-22 | OFDM technology power of alterating and direct current thread industrial call site network and the means of communication of call can be broadcasted |
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| CN103809147A (en) * | 2012-11-12 | 2014-05-21 | 苏州工业园区新宏博通讯科技有限公司 | AC ammeter fault self diagnosis method |
| CN105049087B (en) * | 2015-08-31 | 2017-10-24 | 山东中大电源科技有限公司 | Carrier wave system based on non-interconnected DC line |
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- 2010-11-22 CN CN201310072974.6A patent/CN103312905B/en active Active
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| EP1684493A2 (en) * | 2005-01-24 | 2006-07-26 | Samsung Electronics Co., Ltd. | Apparatus and method for automatically reporting a speakerphone call mode of a portable wireless terminal to a calling partner |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103312905A (en) | 2013-09-18 |
| CN102111513A (en) | 2011-06-29 |
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