CN2544476Y - Blueteeth technology based embedded type public telephone network gateway - Google Patents

Abstract

The utility model relates to a bluetooth technology based embedded type pubic telephone network gateway, which is a radio information switching device and consists of a receiving part, a signal processing part and a transmission part. The device consists of a microprocessor, a random access memory, a flash memory, a chip-select circuit, a bluetooth baseband/ radio frequency module, a crystal oscillator, a reset circuit, a speech dialing circuit, and a PCM speech codec; wherein, the microprocessor is connected with the bluetooth baseband/ radio frequency module through a series port, connected with the speech dialing circuit through a parallel port, connected with the random access memory and the flash memory through data lines, and connected with the flash memory through an address line; and the PCM speech codec is connected respectively with the bluetooth baseband/ radio frequency module and the speech dialing circuit.

Description

Embedded public switched telephone network gateway based on Bluetooth technology

One, technical field:

The utility model is the wireless messages interconnecting device, belongs to the technical field of zonule wireless communication networks device fabrication.

Two, background technology:

Along with the development of Internet and multimedia communication, the personal communication devices has become an important component part of people's daily life rapidly.But often antijamming capability is low for some present personal communication devices, and power consumption is big, function singleness, and user's use is confined to use occasion and Virtual network operator, the defrayment height.People urgently expect to have a kind of effective and efficient manner to make the user can freely select the mode of access network, reasonably arrange the expense of communication voluntarily.

The Wireless Personal Network of Ti Chuing zonule wireless multimedia communication standards such as (WPAN, Wireless Personal Area Network) adopts spread spectrum-CDMA (Code Division Multiple Access) in recent years, has very strong multiple access ability and antijamming capability." bluetooth " technology that " the special interest group of bluetooth " (BSIG, the Bluetooth SpecialInterest Group) that initiate to be set up by companies such as Ericsson proposes with its low price, volume is little, easy to operate and advantage such as low in energy consumption is outshined othersOne branch of the tree is particularly thriving in the technology of WPAN.It is operated in the open frequency range of 2.4GHZ ISM (Industry, Science andMedicine), adopts the technology of short bag and fast frequency hopping, has very strong antijamming capability.

The characteristics that the volume of bluetooth equipment is little, low in energy consumption, cost is low are widely used on the embedded platform it.From now on, such application may be omnipresent, will have many such products in the daily life, and they and all electronic information, electric equipment constitute wireless network, can really realize network is carried.

Bluetooth protocol is a complete comprehensive agreement, has stipulated numerous application models in the agreement.In various application, " three-in-one phone " used is to have much representational a kind of application, and it has made full use of the phonetic function of bluetooth." three-in-one " is meant that cellular handset, public switched telephone network (PSTN) phone, three kinds of functions of enterprises phone are integrated on the voice terminal with Bluetooth function.The application scenario of " three-in-one phone " has the user of " three-in-one phone ", can accomplish to use as common mobile phone out of doors; Indoor use and only need pay the landline telephone expense; And under occasions such as office, then can use the telephone network of enterprises and need not to pay.Not only convenient but also save concerning the consumer, make the user can reasonably arrange the communication spending.The application prospect of " three-in-one phone " is very wide.

PSTN gateway and voice terminal based on Bluetooth technology just is based on " three-in-one phone " and uses.The PSTN gateway can make bluetooth voice terminal device visit PSTN wirelessly, it provides great convenience for voice terminal device dynamically inserts traditional telephone network, also provides a kind of cheap, effective solution for inner intercommunication between terminal equipment.Voice terminal can be that the personal call of single Bluetooth function, the cell phone of band Bluetooth function can also be the multimedia PC etc. of band Bluetooth function.Thereby the cellular telephone subscribers of band Bluetooth function can freely be selected the mode of access network, has great flexibility.

Three, summary of the invention:

(1) goal of the invention

Goal of the invention of the present utility model provides a kind of by the gateway device based on Bluetooth technology, make the user speech terminal can be linked into PSTN easily, maximally utilise mobile communication carrier and local telephone network operator jointly for " three-in-one phone " user provides best service, and the embedded public switched telephone network gateway based on Bluetooth technology that inserts when can support a plurality of terminal.

(2) technical scheme

The utility model is a kind of embedded public switched telephone network gateway based on Bluetooth technology, by receiving unit, signal processing and transport part branch are formed, this device is by microprocessor, random access memory, flash memories, chip select circuit, bluetooth baseband/radio-frequency module, crystal oscillator, reset circuit, the phonetic dialing circuit, the PCM audio coder ﹠ decoder (codec) is formed, microprocessor is connected with bluetooth baseband/radio-frequency module by serial ports, be connected with the phonetic dialing circuit by the parallel port, join by data wire and random access memory and flash memories, join by address wire and flash memories; The PCM encoding and decoding speech joins with bluetooth baseband/radio-frequency module and phonetic dialing circuit respectively; " D0～D31 " end of random asccess memory U2 joins with " MD0～MD31 " of microprocessor U1, and " A0～A20 " end of flash memories U4 joins with " PDA " end of microprocessor U1; Corresponding respectively " A1, A2, the A4 " end with bluetooth baseband/radio-frequency module U6 of the pin of PCM audio coder ﹠ decoder (codec) " 7,2,27 " joins.

(3) technique effect

This utility model has following advantage:

1, make some public places such as family and office building only need a gateway device just can realize the intercommunication of a plurality of user speech terminals and PSTN;

2, the function with three kinds of phones is integrated on the phone, can maximally utilise mobile communication carrier and local telephone network operator provides service for the user jointly;

3, the business of wireless access among a small circle Cellular Networks is professional and based on Bluetooth technology combines, the mobile phone of band Bluetooth function can preferentially select bluetooth to insert, in the unlapped local Cellular Networks that inserts of bluetooth, concerning the consumer, needn't be limited by place and operator, not only convenient but also save, can reasonably arrange the communication spending;

4, can support a plurality of terminals to visit PSTN simultaneously, realize the function of point-to-multipoint, when a plurality of terminals insert, user's use be had no effect;

5, gateway has been realized the seamless link with PSTN, is transparent process to the user.

6, easy to operate, friendly interface has demonstrated fully the characteristics of hommization.

7, when gateway and terminal are not in talking state, all be in energy-saving mode, thereby power consumption is very low.If add high-power power amplifier at gateway and terminal, communication distance can reach 100 meters;

8, because voice have adopted pcm encoder, thereby antijamming capability is very strong.And voice encrypted transmission on link, good confidentiality.

Four, description of drawings

Fig. 1 is embedded PSTN gateway general structure schematic diagram, comprising microprocessor 1, and random access memory 2, flash memory 3, chip select circuit 4, bluetooth baseband/radio-frequency module 5, crystal oscillator 6, reset circuit 7, phonetic dialing circuit 8, PCM audio coder ﹠ decoder (codec) 9.

Fig. 2 is the personal call core board electrical schematic diagram of embedded PSTN gateway and single Bluetooth function.

Fig. 3 is embedded PSTN gateway expansion board electrical schematic diagram.

Fig. 4 is the personal call expansion board electrical schematic diagram of single Bluetooth function.

Five, embodiment

The utility model is used based on " three-in-one phone ".Comprise PSTN gateway and terminal equipment.

Gateway device is by bluetooth baseband/radio-frequency module, the W90221F microprocessor, the PCM audio coder ﹠ decoder (codec), the phonetic dialing circuit, chip select circuit, random asccess memory, flash memory, reset circuit, crystal oscillator is formed, the external PSTN subscribers feeder of phonetic dialing circuit, link to each other with the PCM audio coder ﹠ decoder (codec) with the parallel port of microprocessor simultaneously, the output termination microprocessor of reset circuit and crystal oscillator, microprocessor links to each other with flash memory with random asccess memory with address wire by data wire, the output termination flash memory of chip select circuit, bluetooth baseband/radio-frequency module is connected to the serial ports of microprocessor, link to each other with the PCM audio coder ﹠ decoder (codec) simultaneously, antenna is penetrated in the output sending and receiving of module.

The terminal equipment of single Bluetooth function is made up of bluetooth baseband/radio-frequency module, W90221F microprocessor, PCM audio coder ﹠ decoder (codec), chip select circuit, random asccess memory, flash memory, reset circuit, crystal oscillator, dial, microphone/earphone.Dial, microphone/earphone link to each other with the parallel port of microprocessor, connect the PCM audio coder ﹠ decoder (codec) simultaneously, and the circuit other parts connect identical with gateway.Terminal also can be the multimedia PC of band Bluetooth function, and it is made up of bluetooth baseband/radio-frequency module, PCM audio coder ﹠ decoder (codec), PC and earphone/microphone, and wherein bluetooth baseband/radio-frequency module connects the serial ports of PC, and antenna is penetrated in the output sending and receiving of module.Earphone/microphone links to each other with the PCM audio coder ﹠ decoder (codec).

The PSTN gateway links to each other with extraneous PSTN, when when outside PSTN has the phone incoming call, the phonetic dialing circuit is delivered to the dtmf signal of outside PSTN the parallel port of embedded platform, after operating in gateway program on the embedded platform and detecting this signal by the parallel port, encapsulate this signal according to Bluetooth protocol, convert corresponding bluetooth signaling to and send to indoor terminal equipment, inform that terminal has the phone incoming call.Otherwise, when phone is breathed out, after gateway is received the packet of terminal equipment with the Bluetooth protocol encapsulation, converting thereof into the operational order of off-hook, dialing, control phonetic dialing circuit dials to PSTN.After terminal use and PSTN user's connection, set up voice link between gateway and the terminal, voice transmit on this link, at the gateway end, directly the phonetic dialing circuit is linked to each other with duplexing tone frequency channel wire with the PCM audio coder ﹠ decoder (codec), the terminal use just can be with the PSTN user's communication like this.Voice adopt pcm encoder, and transmission rate is 64Kb/s.

The personal call of single Bluetooth function is Embedded voice terminal, at first initiate the physical link connection procedure by terminal to gateway, when at the starting terminal Bluetooth function, the bluetooth equipment of cordless telephone type around it can be inquired about on one's own initiative, after inquiring such equipment, terminal can be set up physical connection to this equipment active request, for guaranteeing the fail safe of gateway and terminal communication, both sides can carry out authentication process in setting up the physical connection process, have only both sides' information code unanimity could set up physical connection, otherwise can not connect.After gateway and terminal had been set up physical link, terminal can ask to set up the logical links with gateway, had set up just can carry out the phone incoming call behind the logical links and breathe out, and the incoming call of each phone is breathed out and is based upon on the logical links.When not having the phone incoming call to breathe out, gateway and terminal all are in energy-saving mode.During conversation, voice are encrypted transmission on the voice link between gateway and the terminal.

Terminal can be the multimedia PC of band Bluetooth function, and its course of work is the same with the personal call of single Bluetooth function.Terminal also can be the cell phone of band Bluetooth function, it is to insert a bluetooth module on regular handset, when it starts Bluetooth function, communicate by letter with the external world and not pass through Cellular Networks, insert PSTN by gateway wirelessly, when it does not start Bluetooth function, with normal cellular net mobile phone without any difference.

The personal call of embedded PSTN gateway and single Bluetooth function has all used U1 (model of Hua Bang company is the embedded microprocessor of W90221F), adopted the form of two-tier circuit plate, be respectively core board and expansion board, adopt this mode to provide convenience, can under the situation that the core board circuit remains unchanged, expand the expansion board circuit for expanded circuit from now on.The core board circuit structure of gateway and terminal is identical.On the core circuit plate U4 is arranged, it is the Flash ROM of 2M BYTE, and model is AM29F016B, deposits application program and operating system code.Our operating system has been selected this real-time embedded operating system of HOPEN OS for use.The setup code of microprocessor is placed on the last 128K byte place of Flash, and model is that the chip selection signal that chip select circuit U3A, the U5A of 74HC139 produces makes Flash ROM be operated in bank1.Program running is in U2, and it is that model is the SDRAM of W986432DH, and capacity is 8M Byte.Reset circuit resets to each components and parts on core board and the expansion board.Used the crystal oscillator of 27MHZ and 50MHZ respectively, provide clock to microprocessor.There are two purposes the parallel port, both can use when the programming program, also links to each other with the phonetic dialing circuit (gateway end) or the dial (terminal) of expansion board, controls this circuit.Serial ports is connected to the bluetooth module of expansion board, and application program reading and writing serial ports is to receive and to send bluetooth data packets to bluetooth module.

The expander board of gateway and terminal has bigger difference.At the gateway end, bluetooth baseband/radio-frequency module U7 (ROK 101 007 of Ericsson company) provides the function of wireless transmission, and this is the base band and the radio-frequency module of twin-core tablet mode, and its baseband chip is PMB99090, and radio frequency chip is PBA31301/3.During concrete enforcement, for the anti-interference that increases equipment and the communication distance between the equipment, we are placed on the antenna of radio circuit on the shell of equipment.The analog voice signal that PCM encoding and decoding speech circuit is sent sound circuit here carries out pcm encoder and gives base band and radio-frequency module, also the data flow that base band and radio-frequency module are sent here converts analog voice signal to and gives the phonetic dialing circuit, and this function is to be realized by U11 (model is the PCMCODEC of MSM7540L).The phonetic dialing circuit can be divided into sound circuit, level conversion and ringing circuit, dial-up circuit three parts on function.Model is reception and the transmitting function that the sound circuit U12 of MC3K014 realizes voice, level conversion and ringing circuit detect the next bell signal of PSTN and this signal level are changed, the U13 model is that the dial-up circuit of MT8889 mainly sends dtmf signaling to PSTN, and PSTN is dialled.In terminal, the difference of expander board and gateway is that mainly terminal does not have the phonetic dialing circuit, the substitute is the interface circuit with dial, this interface circuit links to each other with dial by the parallel port, and the mode of application program life cycle inquiry parallel port obtains the current button of pressing.Determine that the current keying method of pressing is as follows: 8 data lines of using the parallel port, wherein 4 inputs, 4 outputs, periodically (every 50 milliseconds) circulation is put height with of four output data lines, read four input data lines again, leave the value of reading, after the value pairing of writing, the inquiry button form obtains current button.In realization, we have also increased the processing to problems such as key jitters.In addition, terminal also has earphone and microphone.

Claims (3)

1, a kind of embedded public switched telephone network gateway based on Bluetooth technology, by receiving unit, signal processing and transport part branch are formed, it is characterized in that this device is by microprocessor (1), random access memory (2), flash memories (3), chip select circuit (4), bluetooth baseband/radio-frequency module (5), crystal oscillator (6), reset circuit (7), phonetic dialing circuit (8), PCM audio coder ﹠ decoder (codec) (9) is formed, microprocessor (1) is connected with bluetooth baseband/radio-frequency module (5) by serial ports, be connected with phonetic dialing circuit (8) by the parallel port, join by data wire and random access memory (2) and flash memories (3), join by address wire and flash memories (3); PCM encoding and decoding speech (9) joins with bluetooth baseband/radio-frequency module (5) and phonetic dialing circuit (8) respectively.

2, the embedded public switched telephone network gateway based on Bluetooth technology according to claim 1, it is characterized in that " D0～D31 " end of random access memory (2) U2 and " MD0～MD31 " of microprocessor (1) U1 join, " A0～A20 " end of flash memories (3) U4 joins with " PDA " end of microprocessor (1) U1.

3, the embedded public switched telephone network gateway based on Bluetooth technology according to claim 1 and 2 is characterized in that corresponding respectively " A1, A2, A4 " end with bluetooth baseband/radio-frequency module (5) U6 of pin " 7,2,27 " of PCM audio coder ﹠ decoder (codec) (9) joins.

Images