CN1267159A - Wireless modem based on wireless data transmission network - Google Patents
Wireless modem based on wireless data transmission network Download PDFInfo
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- CN1267159A CN1267159A CN 00114437 CN00114437A CN1267159A CN 1267159 A CN1267159 A CN 1267159A CN 00114437 CN00114437 CN 00114437 CN 00114437 A CN00114437 A CN 00114437A CN 1267159 A CN1267159 A CN 1267159A
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Abstract
A wireless modem based on wireless data transmission network uses digital signal processor WIN56303 as main chip, which is connected via varous buses respectively to data registers, program registers, sequence registers, data converter, signal converter WIN-flex and computer. Said data converter is also connected to wireless interface chip WIN-CDPD linked to network in wireless mode. Its advantages are small size, high information transmission efficiency and high transmission reliability.
Description
The present invention relates to a kind of modulator-demodulator of data transmission network, especially used modulator-demodulator in the computer data information transmission network.
Modulator-demodulator in the computer data information transmission network, main effect be with the output information of computer after overcompression etc. is handled, be modulated into the aspect of certain agreement, as audio signal, pulse information or vision signal etc., deliver to the modulator-demodulator of another computer by certain transmission means, processing such as the information via demodulation that can send other modulator-demodulator, decompress(ion) simultaneously make and calculate function and receive.Modulator-demodulator on the at present domestic computer data transmission network all needs to be coupled to each other by a telephone wire or fiber optic cable, following weak point is arranged: (1) structurally must have the interface of an external connection, after service time is long, the phenomenon of loose contact is arranged, influence information transmission quality; (2) network connection engineering and expense are big, or it is quite a few to take the expense of telephone wire; (3) because line is arranged, make computer network be not easy to carry.Wireless data transmission network, be called for short CDPD, began to build in the U.S. in 93 years, it is based on the digital packet technology, data message is attached to the network that has now on the cellular mobile phone communication network after treatment, and people may pass through mobile telephone network, with the mode of operation of wired computer network, realize the wireless computer the Internet, the purpose of transmitting data information.Because the cost of serving of CDPC is low, technology maturation is reliable, begins so far to popularize in the whole world.
The purpose of this invention is to provide a kind of radio modem, make computer data information transmission network portability become possibility based on wireless data transmission network CDPC.
Above-mentioned purpose is to realize like this, with digital information processor WIN 56303 is master chip, by each bus respectively with data register SRAM, program register Flash ROM, sequential register serial EPROM, computer and digital to analog converter, and signal converter WIN-flex connection, also be connected with light emitting diode display circuit, clock oscillation circuit and power supply by line; Digital to analog converter also is connected with transducer WIN-flex, loud speaker and microphone by line; Transducer WIN-flex is connected with wireless interface chip WIN-CDPD by line; And wireless interface chip WIN-CDPD gets in touch and transmission information with wireless mode and wireless data transmission computer network CDPD.The effect of wireless interface chip WIN-CDPD is by the antenna receiving-sending data message, signal to input carries out signal identification, DPD gets in touch with network C, and client identity is verified and useful signal is defeated by master chip, or signal is defeated by master chip after transducer WIN-flexl processing; The effect of master chip and annex thereof is that the information of input and output is controlled and managed, i.e. computer and wireless interface chip WIN-CDPD are linked up in modulation and demodulation work, and the contact between the network, thereby achieve the goal.
The modulator-demodulator of said structure has been compared following advantage with existing modulator-demodulator: (1) can match with portable computers such as existing notebook type, palm type and instant translators, constitutes the mobile data information terminal; (2) installing engineering and the expense of networking circuit have been omitted; (3) because wireless data transmission network CDPD adopts the transmission means of progressively packing, and the user can be connected on the net all the time, but whether by the networking time charge, but charge by volume of transmitted data, so cost of serving is low; (4) efficiency of transmission height, average data has only several milliseconds launch time, and multiple users share connects in the air, because of the user has been connected on the net, so transmission delay is very of short duration; (5) transmission is reliable, because information transmitted digitlization, and has contained error correcting code, has compressed to add encryption in the transmission way, so can guarantee the safe and reliable of data message effectively; (7) in addition in the mode of broadcasting, broadcast some signal to a certain group of client simultaneously, as weather forecast, quotations on the stock market and transport information etc.
Below, in conjunction with the accompanying drawings, the invention will be further described.
Shown in Figure 1, be the invention process theory diagram.
Shown in Figure 2, be wireless interface chip WIN-CDPD theory diagram of the present invention.
By among Fig. 1 as can be known, the configuration sequence register serial EPROM that digital signal processor master chip WIN 56303 heaps by signal bus and data and program is carried out register SRAM, program register Flash ROM, Modem is connected; Also be connected with computer, be connected with signal converter WIN-flex, be connected with digital to analog converter by industrial bus ESSI PORTO by industrial bus ESSI PORTI by industrial bus SCI; Also be connected with status signal light emitting diode display circuit, clock oscillation circuit and power supply respectively by line.Digital to analog converter is connected with microphone with clock oscillation circuit, signal converter WIN-flex, loud speaker respectively by line.Signal converter WIN-flex is connected with wireless interface chip WIN-EDPD by line.Wherein, master chip WIN-56303, signal converter WIN-f1ex and wireless interface chip WIN-CDPD are the special chips of this Shengli Science and Technology Co., Ltd., Nanning.From Fig. 2, know, wireless interface chip WIN-CDPD is by the identification of signal transceiver, signal amplifier, wireless data transmission network CDPD server and client identity validator, and antenna, identification error withdraw from circuit and the authentication failed formations such as circuit that exit network.Their connection is joined with line according to the order that signal transceiver, signal identification amplifier, wireless data transmission network CDPD server and visitor produce identity verifier thereof, and identification error withdraws from circuit and is connected with the output of signal identification amplifier; The authentication failed circuit that exits network is connected with the output of client identity validator.The workflow of whole modulator-demodulator is: the signal of data information transfer network C DPD is crossed antenna entering signal transceiver, be defeated by signal identification amplifier, signal is not if satisfy the requirement of this network, then withdrawing from circuit from identification error withdraws from, signal is if satisfy network C DPD requirement, then can enter this webserver and client identity validator, at this moment digital signal processor can send a signal and gets in touch to the webserver and the Network Provider of CDPD net, signal is tested, after service and checking to signal client identity and the agreement followed etc., entering signal transducer WIN-flex, for satisfying the semaphore request of digital signal processor, signal is strengthened, the signal some enters digital signal processor, another one enters digital to analog converter and transfers digital signal to and just enter digital processing unit, if signal is a multi-media signal, and can be again through digital to analog converter output audio and vision signal.Digital signal processor and accessory circuit are done a series of works of treatment such as data heap, demodulation, protocol verification with the signal of input, and signal is defeated by computer, and processor also mails to the light-emitting diode indicating operating status with the status signal that produces; The transmission of signal is the opposite sequence of said process, is sent to network C DPD by signal transceiver.
Claims (2)
1, a kind of radio modem based on wireless data transmission network, it is characterized in that: with digital signal processor (WIN56303) is master chip, is connected with computer with data register, program register, sequential register, digital to analog converter, signal converter (WIN-flex) respectively by each bus; Also be connected with light emitting diode display circuit, clock oscillation circuit and power supply by line; Signal converter wherein also is connected with wireless interface chip (WIN-CDPD), and the work of this wireless interface chip is got in touch with wireless mode and wireless data transmission network CDPD.
2, a kind of radio modem based on wireless data transmission network according to claim 1 is characterized in that: wireless interface chip (WIN-CDPD) is connected and composed in regular turn by signal transceiver, signal identification amplifier, wireless data transmission network server and client identity validator; Wherein, signal identification amplifier also withdraws from circuit with identification error and is connected; The client identity validator also is connected with the authentication failed circuit that exits network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00114437 CN1267159A (en) | 1999-08-24 | 2000-03-18 | Wireless modem based on wireless data transmission network |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99243616 | 1999-08-24 | ||
| CN99243616.8 | 1999-08-24 | ||
| CN 00114437 CN1267159A (en) | 1999-08-24 | 2000-03-18 | Wireless modem based on wireless data transmission network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1267159A true CN1267159A (en) | 2000-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00114437 Pending CN1267159A (en) | 1999-08-24 | 2000-03-18 | Wireless modem based on wireless data transmission network |
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| CN (1) | CN1267159A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1750526B (en) * | 2004-09-01 | 2010-06-23 | 株式会社东芝 | Digital signal transfer device |
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2000
- 2000-03-18 CN CN 00114437 patent/CN1267159A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1750526B (en) * | 2004-09-01 | 2010-06-23 | 株式会社东芝 | Digital signal transfer device |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |