CN1021006C - Duplex centerless frequency-deivision multiple access carrier telephone system - Google Patents

Abstract

The present invention relates to a duplex centerless frequency-division multiple address carrier telephone system which is composed of basic communication networks and a special networking machine, wherein each basic communication network is composed of duplex centerless multiple address carrier telephones, and the special networking machine is responsible for telephone traffic tandem between the basic networks. Telephones in the same basic network exchange telephone traffic with each other directly, and each basic network can work independently without the need for any switching center. Only one different frequency duplex channel is occupied during duplex communication between two optional telephones in the same network. The networking machine is used for telephone traffic tandem between the basic networks during networking expansion and various other communication services including a specific telephone traffic service.

Description

Duplex centerless frequency-deivision multiple access carrier telephone system

The present invention relates to duplexing no center frequency division multiple access carrier telephone system, (duplex refers to receive and send out and work simultaneously to belong to the carrier telephone class; No center refers to not have switching center; Frequency division refers to the frequency division multichannel; Multiple access refers to the multiaddress channel sharing).

Existing is that the frequency multiplexing alien frequencies duplex carrier telephone system of transmission medium is the core-multichannel carrier in the loop carrier system with the aerial line, and it is as the relay that improves line efficiency, and its effect is equivalent to more than one the telephone cable to heart yearn.And the input and output of user's terminal (or claiming extension) remain audio baseband signal.The exchange of traffic is finished by telephone exchange.Other has a kind of alien frequencies duplex carrier telephone, and the input and output of extension set are carrier signals, carry out the traffic exchange by retransmission center, takies two alien frequencies duplex channels when conversing between two parts machine in the system.

The duplex of Jie Shaoing does not have center frequency division multiple access carrier telephone system in the present invention, does not adopt above-mentioned networking mode, does not form basic communication network but directly have center frequency division multiple access carrier telephone (the following phone that all is called for short) with duplex except that specializing.Wantonly two phones that are in the same basic net directly carry out the traffic exchange, and basic net itself can work alone, and the traffic that the networking machine then is used between two or more basic nets exchanges, promptly be used for each net substantially between tandem.

The objective of the invention is to improve the availability of frequency spectrum of open-wire carrier system, realize direct duplex signaling and improvement dilatation networking mode between any two phones in the same basic net.

In brief, native system uses the no center of multi-section duplex frequency division multiple access carrier telephone.Total system uses one or more groups duplexing traffic channel and one or more signaling channel.Operations such as ring-back, ring, hum, busy tone are switched, produced to the frequency that phone carries out Channel Detection, search, signaling reception and transmission, transceiver channel automatically.The networking machine carried out operations such as net calling signaling identification and signaling forwarding, path selection, switching matrix monitoring automatically, undertook the mistake net traffic tandem between the basic net.

The present invention implements with the following methods:

The multi-section phone that is connected in same transmission lines has been formed basic communication network, phone is made up of Receiver And Transmitter, its working form is frequency division multichannel frequency modulation or amplitude-modulation system, program-controlled frequency synthesizer is set as receiver local oscillation signal source and carrier of transmitter signal source in the phone, a switchable directional filter of working frequency range is set between the difference engine of phone and the receiver inlet, also can use the voltage controlled filter or the tracking filter of same function, the switching of synthetizer output frequency and the switching of directional filter are carried out synchronously by controller control, basic net is independently finished traffic exchange in the net, the shared one group of alien frequencies duplex traffic channel of all phones and a signaling channel in the basic net.The phone of wantonly two direct duplex signalings only takies one of them duplexing traffic channel.In order to enlarge the capacity of system, finish each traffic tandem between netting substantially by the networking machine.

Fig. 1 is that system forms schematic diagram.

Fig. 2 A is the phone block diagram.

Fig. 2 B is the control flow sketch of phone to Fig. 2 D, has briefly described the course of work of phone.

Fig. 3 A is the structural representation of networking machine.

Fig. 3 B is a carrier interface cell schematics in the networking machine.

Fig. 3 C is the control flow chart of networking machine, has briefly described the course of work of networking machine.

Fig. 4 is a kind of signaling format example that can be practical.

Carry out necessary explanation below in conjunction with the code name among Fig. 1, Fig. 2 A, Fig. 3 A and Fig. 3 B.

Among Fig. 1: 1: networking machine, 2: phone, 3: one separate lines.Particularly pointing out at this, is easily with conspicuous though adopt the aerial line networking, and the circuit of any suitable native system as mains lighting supply line, coaxial cable, some telephone cable etc., all can be used as the system group network circuit.Whether every circuit is independently to be meant the direct carrier wave contact that does not have internal system institute stipulations between each bar circuit, and do not consider to have between each circuit direct current or other to get in touch with irrelevant the exchanging of native system.4: represent one or more public network telephone wire or trunk line, be used for native system and public network is incorporated into the power networks.

Among Fig. 2 A: 1: represent a separate lines.2: the expression difference engine is used for the initial gross separation of receiving and transmitting signal.3,4: the expression change over switch, can be electromechanical or electronic type, be used for the access of switching filter 5 or 6, represent the switching controls line with the directed line segment that the D of controller 34 end links to each other.5,6: the band pass filter of two passband non-overlapping copies of expression, or the nonoverlapping high pass of passband and a low pass filter also can be the band stop filters of stopband non-overlapping copies.The back is used for anti-interference less demanding situation for two kinds.They and 3,4 common constitute the switchable directional filter of working bands, be connected between difference engine and the receiver inlet.Isolate with further raising transmitting-receiving.This is that the key technology that realizes the no Center Scheme of duplex one of is formed.7: the first frequency mixers.8: one local frequency synthesizers.19: the standard reference frequency signal source is used to synthetizer that reference signal is provided.9: one intermediate-frequency filters.10: two frequency mixers.11: two local oscillation signal sources are if adopt a mixing then to remove 10,11 and 12.12: be two intermediate-frequency filters.13: for intermediate frequency amplifies and demodulator.If modulation system adopts amplitude-modulation system, then comprise appropriate sections such as automatic gain control carrier frequency recovery.14: Audio Band Pass Filter if adopt frequency modulation system, then comprises de-emphasis network.15: the channel status indicating device.It can be signal type or noisy-type, and this is not limited.18: the ring-back detector.26: audio switch, by the G end control of controller 34.16: audio frequency amplifies.17: hum, busy tone, ring generator.31: ringing loudspeaker.32: earphone.33：MIC。35: audio switch.25: voice signal processor.27: the ring-back generator.37: modulator.36: carrier-fequency generator.38: single sideband filter.23: frequency mixer.As adopt frequency modulation system, and then remove 37,36,38, change by R and lead directly to 23, as shown in phantom in FIG., at this moment 23 change modulator into.24: frequency synthesizer, by the M end control startup of controller 34.21: the carrier power amplifier, by its startup of P end control of controller 34.22,39: the segmentation controllable filter, can adopt and the receiver homogeneous structure, if 21 are linearity amplifiers preferably, also can remove 39, if perhaps working frequency range is less than an octave, 22 and 39 can not segmentation, at this moment removes to 22 and 39 dotted line by S o'clock.20 is the signaling modulator-demodulator, can adopt the various standards that are adapted at transmission in the audio frequency passband, as: FSK, MSK, single-tone keying, multifrequency double-tones (DTMF) etc. do not limit at this.20 carry out bi-directional data with the C of controller 34 end transmits, Q end control by controller 34,28: this machine numbering encoder, 29: the phone keyboard, 30: insert the spring switch, be used for the indication of dislodging machine, 34: be controller, obviously adopt one chip microcomputer to be easy to realize, but do not get rid of the employing alternate manner.What this need particularly point out is that directional filter also can adopt voltage controlled filter or tracking filter.Main spirit of the present invention is to adopt by controller control and the directional filter that programmed control frequency synthesizer output frequency switches synchronously, reaches the purpose that the Receiver And Transmitter working frequency range switches mutually, to realize the no Center Scheme of duplex.

Fig. 2 B has provided the control flow schematic diagram of duplexing no center multiple access carrier telephone set to Fig. 2 D.Some is described earlier here: wherein 35,36,37 these links represent the phone of active call judges whether cross the net calling according to the sign in the signaling, and whether decision switches transmitting-receiving working frequency range (comprise the switching of directional filter, they carry out synchronously).The operations of 19 beginnings are when preventing can not to send on-hook signal because of reasons such as phone sudden power, cause taking public network speech channel overlong time and are provided with.Wired call signs of being incorporated into the power networks of 54 expressions are provided with for networking machine signaling identification, with 19 differentiated what transmitted by the networking machine is same.50 to cross the net call signs be when preventing that other phone from surpassing the decode error control ability and cause decoding error because of some reason such as bursty interference time, or phone wired dialing of calling out of being incorporated into the power networks of sending is when numbering coincidence with the net interphone, producing misoperation may just be provided with at working channel in the EVAC (Evacuation Network Computer Model), simultaneously also as main foundation of exhaling phone whether to switch the transmitting-receiving working frequency range.Here the flow chart of relevant dialer operation part designs at 3 * 4 plain old telephone keyboards.As adopt 4 * 4 or more during the dialer of multikey number relative section can do corresponding change.In addition, if adopted multifrequency double-tone (DTMF) to wait other signaling load mode in the signaling format of accompanying drawing 4 expressions and the flow chart relevant sign setting and identification division can do corresponding change, among Fig. 2 A 18 and 27 also can remove, and all finish the signaling modulation, the function that ring-back sends and detects by 20.

Below in conjunction with the numbering of the flow chart among Fig. 2 B, 2C, the 2D, briefly narrate the work overall process of phone.

Wherein: 1: start, 2: initialization, set the synthetizer of receiving with sending out and be output as the signaling channel frequency, close the carrier power amplifier, synthetizer, transmitting-receiving audio switch, change over switch is set passband is comprised that the directional filter of signaling channel inserts (being that high-end section highest frequency is example with the signaling channel frequency for convenience of explanation) here, close hum, busy tone, ring generator and ring-back generator, set the signaling modulator-demodulator, be the signal demodulation state.3: differentiate the handle off-hook not? under divide two the tunnel: off-hook not, then carry out 4,5,6,7,8 detection channel status indicating devices and signaling modulator-demodulator successively the generation of calling arranged? signaling after the signaling modulator-demodulator input demodulation is arranged then, check whether it was the signaling that net is called out class.(as the 9th section the 0th the binary digit sign of B among Fig. 4) is not, then with respective field sign in this machine coding of this machine numbering encoder and the signaling) be not, then respective field (as the 11-17 section of C section among Fig. 4) in this machine coding of this machine numbering encoder and the signaling is compared, meet and then carry out 9,55: by signaling channel number set receive with the synthetizer output frequency be whether corresponding operating frequency discerns special service call (as the 9th section the 1st the binary digit sign of B among Fig. 4), be then to carry out 56, otherwise carry out 10: start synthetizer and carrier power amplifier, 11,12,13: start the ring-back generator, hum, busy tone, ring generator sends backward signalling and this power ringing signal.Differentiate handle and do not pluck also not overtimely, then continue to carry out 11,12,13, overtimely then change 14,52: sending resets behind the on-hook signal goes back to 3(and goes back in 11 13, inserts one section the other side's on-hook differentiation 58).This cleaner handgrip off-hook carries out 15: close hum, busy tone, ring generator, ring-back generator, open the transmitting-receiving audio switch, so far finish the operation of once waiting for by access success, enter talking state.Below 16,18,17,19,20,21,52: as long as meet reset condition, promptly enter the reset routine operation: wherein 19 addressed, another dataway operation since 3, differentiating the spring on off state is to enter 2 behind the off-hook: start hum, busy tone, ring generator, send dialing tone and prepare to accept the dialer input operation, 23: dialer has input, enter 24: whether differentiating assignment key " # " number, is not then to enter 25,26,47,48,49,50,51,53,54,57: operations such as number is removed, sign is provided with number storage.Be that " # " number key then enters 27: close hum (dialing tone), 28,29: detect channel status, it is empty to differentiate current channel (channel of using when conversed last time)? not emptyly enter 30: search for and not overtimely return 28 and differentiate next traffic channel, overtime then 31: send busy tone, 52: resetting turns back to 3:29: channel idle, 32: get back to signaling channel, and assembling signaling (as Fig. 4 form), 33: signaling channel is busy to return 28, free time then enters 34: start synthetizer, the carrier power amplifier, the equipment signaling modulator-demodulator is a modulation condition, send call signaling, turn back to the sky of having chosen and close traffic channel, 35: differentiate whether cross net calling (referring to the calling that this machine sends) according to the O position binary digit of the 9th section of B among Fig. 4, it is then 36: the operation change over switch, the transmitting-receiving synthetizer, make to receive and be set at the low state occurred frequently of receiving with the working frequency range of sending out, otherwise 37: the operation change over switch, synthetizer, make to receive and send out high state for receipts are low with the working frequency range of sending out, 38: start the carrier power amplifier, 39: time-delay, 40: receive that the called party backward signalling changes 43: connect radio reception switch frequently, so far finish from calling out to the process of receiving the other side's ring-back and enter talking state.44,45,46: differentiation is satisfied reset condition and is entered reset operation.As do not receive that the called party ring-back changes from 40 and 41,42 close transmitter, send busy tone.52 reset.

The networking machine control flow chart that Fig. 3 C provides has briefly been described the groundwork process of networking machine, which does not distinguish here finished by C controller or A controller.Need to form in this technology that is pointed out that the networking machine that Fig. 3 A and Fig. 3 B are illustrated, major part is a prior art, for example: as adopting the SSB system.The critical piece of then existing loop carrier machine, multichannel carrier transmits and receives the unit, promptly can be used as the multichannel carrier parts among Fig. 3 B; As adopt frequency modulation system, then the appropriate section in the multichannel frequency modulation booster station promptly can be used for this purpose (working frequency range will be adjusted accordingly certainly), and switching network and controller technology thereof have been high matures in the public network field, as long as distortion both can be adopted in the networking machine a little; Different only be to have increased among Fig. 3 B for the traffic tandem that adapts between a plurality of basic nets: signaling modulator-demodulator and cell controller A.Because the basic net in the native system can be made up of phone fully, self-organizing system has the independence of height, and is therefore quite similar about the appropriate section of the controlled function of the signaling capability of networking machine and cell controller and phone, difference only is that one is at multichannel single channel traffic; One be at multichannel multichannel traffic and with controller C(Fig. 3 A in C) coordinate mutually.As long as fully understand the relevant explanation of phone, will be very clear to the technology and the course of work thereof of networking machine.So Fig. 3 A, Fig. 3 B and Fig. 3 C are highly schematic and recapitulative.Be simplified illustration abridged certain operations process, can consult other accompanying drawing and draw with corresponding explanation.For example: if phone adopts the SSB system, wherein the signaling modulator-demodulator adopts the DTMF mode, then the networking machine can adopt existing loop carrier machine to need not any change as the P parts among Fig. 3 A, J and C can be with one one 200 to the little programme-controlled replacements of hundreds of door, its Subscriber Line Concentrator linked to each other with P to get final product, if with the relevant signaling moiety in its Control Software by Fig. 4 (Fig. 4 only be lift for convenience of explanation can the reality employing example) do corresponding change.

Among Fig. 3 A: J: represent a switching network.P ₁And P _N: represent N the carrier interface unit that structure is identical.3: one circuits independently.C: expression control unit.T: expression attended operation platform.5: expression native system and public network and network interface.F: concentrate frequency source.B: be the frequency multiplexing carrier wave component in each interface unit.A: be the interface unit control assembly.

Fig. 3 B is a carrier interface unit rough schematic view in the networking machine.Wherein:

3, separate lines in the system, 1, difference engine is used to receive and dispatch initial gross separation.2, the 6th, the both direction filter, further transmitting-receiving separates.4, reception amplifier.7, emission power amplifier.BT _oIt is the signaling channel receiving-member.BR ₁To BR _MBe the traffic channel receiving-member.5, voice-frequency signaling modulator-demodulator.A, cell controller.FR _oTo FR _MAnd FT _OTo FT _MBe receiver local frequency signal and the transmit frequency signal of concentrating frequency source F unit to send here.J ₁₁To J ₁M and J ₂₁To J _2MIt is the audio signal circuit of input and output switching network.

Fig. 3 C is the control flow sketch of simplifying.The course of work of networking machine has been described briefly.

Fig. 4: can the actual signaling format example that adopts.Wherein 1 to 26 represents 26 section 4 bit sign indicating number, wherein 1 of A to 7 segment tables show numbering of the phone of active call itself, and the 8th section of B as standby, the 9th section the 3rd binary digit, formed channel code with 4 binary digits of the 10th section, be used for indicating selected channel number, represent channel number with 5 binary digits here, preceding 3 of the 9th section are used as flag bit, the net calling is crossed in the 9th section O bit representation request successively, C totally 14 sections, shows 4 item sign indicating numbers as the dialing of call peer.D is standby, and E represents the figure place of significant number among the C as the dialing significance indicator.This example be for convenience of explanation and lift can the actual form (wherein having omitted sync section) that adopts.Whether best format should be according to adopting the type of the signaling channel and the modulation of adopting to make suitably increase and decrease and increase sync section and take certain error control.

Do some explanation with regard to the coding rule of native system, special clothes coding, networking mode etc. below.Owing to adopt the strict distinguishing signaling type of special sign, both can adopt the coding unified (native system is as the part of public network) with public network, also can adopt freely encode (native system is as group telephone), owing to enough dialing length is arranged, can keep a few bit number prefixs and obey coding maker as the spy.Networking mode relates generally to numbering register method (being meant the registration management method of networking machine dialogue machine here), both can adopt also can adopt and register at random that (phone is applied for the registration of voluntarily by line (separate lines) process registration (representing the place wire size for former of fixing registration-phone numbering), automatically send when being the phone power-up initializing and the identical call number of this machine numbering, flag bit all is " 0 " or all be " 1 " or the signaling of establishing identification code in addition, after receiving that the networking machine is registered the answer signal that meets, just be accepted networking.), also can adopt double registration (preferentially to press the line registration, when needing, adopt the interim wire size of special clothes randomly changing or un-register.), the separate lines numbering that net substantially at second way phone position and phone place is irrelevant, is fit to the user that the minority mobility is had relatively high expectations, and the third mode is the comprehensive of preceding dual mode.The establishment that these relate to Control Software repeats no more here.

Duplex centerless frequency-deivision multiple access carrier telephone system according to the present invention's realization, has following advantage: the basic communication network that is all formed by phone, itself has function of exchange, internal communication is acentric, all phone shares one group of traffic channel and a signaling channel, phone numbering circuit physical location residing with it has nothing to do and according to being flexible within certain limits, save half frequency spectrum than the carrier telephone system that retransmission center is arranged, only take an alien frequencies duplex channel during communication between wantonly two phones, but the multichannel duplex signaling; Only need set up a networking machine when a plurality of Basic Nets expand networking, can carry out with program control public network similar extraordinary service business in the system this moment.

So far complete introduction satisfy a system of all conditions of subject matter, this system can be used for various local telephone networks and variously is suitable for the communication purpose that carrier wave transmits. Obviously, utilize the present invention can form more complicated multilevel system. Realizing the required various technological means of native system, is that the technical staff of communication specialty and computer major is familiar with. Therefore only otherwise leave the scope and spirit essence of defined in the claim, various changes can be made and replace.

Claims (7)

1, a kind of carrier telephone system is made up of the multi-section phone of shared same transmission lines, and said each phone comprises:

Receiver And Transmitter is used for receiving respectively and launching speech and signaling-information on a selected traffic channel;

Control device is used for controlling the work of described phone able to programmely;

The signaling modulator-demodulator by described control device control, is used for signaling-information is carried out modulation and demodulation;

The channel status detector is used to detect the busy-idle condition of voice channel, and gives control device with status signal; It is characterized in that described phone also comprises:

Program-controlled frequency synthesizer, the switching of its output frequency is controlled by described control device, as the local oscillation signal source and the carrier of transmitter signal source of described receiver;

The switchable directional filter of working frequency range, the switching of its working frequency range is controlled by described control device, and carry out synchronously with the switching of described program-controlled frequency synthesizer output frequency, described directional filter is arranged on the receiver inlet of phone, in order to realize receiving and sending the further isolation of signal.

2, system according to claim 1 is characterized in that: described directional filter is made up of two electromechanics or electronic simulation formula switch and two nonoverlapping filters of working frequency range.

3, system according to claim 2, it is characterized in that described two nonoverlapping filters of working frequency range are the high pass filter of two passband non-overlapping copies and the band stop filter of a low pass filter or two stopband non-overlapping copies, or the band pass filter of two passband non-overlapping copies.

4, system according to claim 1 is characterized in that described directional filter is a control filter or tracking filter.

5, system according to claim 1, it is characterized in that, described transmitter includes one group of switchable low pass of the working frequency range that is controlled by the controller or band pass filter, is used for when the working frequency range of transmitter surpasses an octave, further filtering high order harmonic component composition.

6, system according to claim 5 is characterized in that, the used filter that plays buffer action of described band pass filter and receiver inlet has same structure.

7, a kind of method of work of carrier telephone system, wherein said carrier telephone system is made up of the multi-section phone of shared same transmission lines, transmit voice signal through a plurality of voice channels between the said phone, and, it is characterized in that every phone execution the following step through a signaling channel transmission signaling-information:

(1) main exhaling under the state:

The relevant sign in the signaling is sent in a, setting, the sign traffic category;

The working frequency range of the directional filter of b, the operating frequency of setting receiver and transmitter and a reception and transmission buffer action;

C, carry out the search of idle voice channel;

D, the channel code of the idle channel that searches, this machine coding, the other side's number are assembled into signaling with the sign of sign traffic category;

E, get back to signaling channel, and differentiate signaling channel and send call signaling after the free time;

F, the frequency that resets above-mentioned directional filter frequency range and receive and launch work in traffic channel;

(2), under the waiting state:

A, receipt of call signaling;

B, by channel code and sign in the signaling, the identification traffic category;

C, the working frequency range and the operating frequency that reception are set and launch;

D, work in traffic channel.

Images