CN2463879Y - Personal digital assistant device with one-way communication and two-way transmission function - Google Patents
Personal digital assistant device with one-way communication and two-way transmission function Download PDFInfo
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- CN2463879Y CN2463879Y CN 01200553 CN01200553U CN2463879Y CN 2463879 Y CN2463879 Y CN 2463879Y CN 01200553 CN01200553 CN 01200553 CN 01200553 U CN01200553 U CN 01200553U CN 2463879 Y CN2463879 Y CN 2463879Y
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Abstract
A personal digital assistant device with one-way communication and two-way transmission function includes a one-way communication module and a two-way transmission module for receiving the signal transmitted by service provider and making the personal digital assistant device and peripheral electronic products generate two-way signal to and fro through the two-way transmission module, in which the transmitted data and signal can be deciphered, judged and processed by central processing unit. Moreover, since the bidirectional transmission module can be formed by a bluetooth module, it can be used to control an electronic product having a transmission chip around it, or download the required program or data from the related electronic device, thereby further improving the function of the pda.
Description
It is relevant that the utility model relates to a kind of personal digital assistant device, particularly a kind of personal digital assistant device with one-way communication system and double-direction radio, non-directional transmission system.
Along with electronics technology develops fast with progressive, the electronic product of a new generation often all tends to compact, function is many and processing speed is used as design direction soon, so that meet the demand that modern society lives in design.For example, (Personal DigitalAssistant PDA), owing to it is convenient for carrying, and can handle a large amount of numerical informations, therefore is subjected to society and generally likes and use with at present very popular personal digital assistant device.Particularly for being engaged in the consumer of business activity, personal digital assistant device also can store a large amount of names, address and telephone number except important stroke, transaction journal can being got off, and therefore can provide great facility and help.
In order to handle and show important information in real time, in present personal digital assistant device, often comprised and to have carried out the relevant apparatus of one-way communication, so that the user is provided information flow environment more easily.Wherein, by the receiving trap that uses such as pager (paging receiver), can be by the system service dealer with real-time information, updated information or Application Software Program, one-way transmission is in user's digital assistant.Yet, because the one-way communication device, only can folk prescription to ground by the system service supplier, personal digital assistant device is summoned action.Therefore concerning the user, can only carry out the reception program passively, and can't pass through personal digital assistant device, externally transmit data or information.
In present relevant design, though can utilize the cable ways of connecting with personal digital assistant device and other electronic product lines, and carry out the round transmission of data or signal.But for the user, need, in case of need, too bother really with the connection cable.And,, also can't make to produce between electronic product and the personal digital assistant device to link by cable in case electronic product and user distance that desire connects are far away excessively.In addition, only manage certain personal digital assistant device partly, adopt the mode of infrared transmission, and realize wireless link between other electronic product.But in the application of reality, be limited by infrared transmission and need possess directivity, and its coverage is too short, make and use the infrared transmission mode, still have considerable difficulty in personal digital assistant device.
The purpose of this utility model provides a kind of personal digital assistant device that has unidirectional transfering function (as beeper) and transmitted in both directions function simultaneously, and provide this personal digital assistant device can non-directional/wireless mode, carry out the exchange of data and signal with electronic product on every side.
Another purpose of the present utility model provides a kind of personal digital assistant device with transmitted in both directions function, can carry out exchanges data with electronic product on every side, and allow the user operate this personal digital assistant device, reaches and controls the purpose of electronic product on every side.
The purpose of this utility model is achieved in that a kind of personal digital assistant device with one-way communication and transmitted in both directions function, it is characterized in that: this personal digital assistant device comprises: the one-way communication module, in order to receive one way signal by the ISP transmitted; The transmitted in both directions module can make this personal digital assistant device and electronic product on every side carry out wireless and direction-free two-way signaling and transmit and receive; Central processing unit is coupled in this one-way communication module and this transmitted in both directions module respectively, in order to understand, to judge and to handle this one way signal and this two-way signaling; Memory component in response to the requirement of this central processing unit, and transmits data, data and the application program be stored in this memory component to this central processing unit; And display device, be coupled in this central processing unit, in order to the state that shows this personal digital assistant device, the information of reception, with the data of handling.
Wherein above-mentioned memory component comprises at least: mask ROM, in order to master database and the built-in application program that stores this personal digital assistant device; Flash memory in order to storing the data that received by this one-way communication module and this transmitted in both directions module, and uses when this central processing unit executive utility is provided; And random access memory, in order to be written into this built-in application program of carrying out, to accelerate the execution speed of this central processing unit.
Wherein more comprise a user interface, be connected in this central processing unit, in order to control this central processing unit executive utility, store information, output data.
Wherein more comprise a sound interface, be coupled in this central processing unit and this transmitted in both directions module respectively, can external microphone and loudspeaker, so that the user can talk via this transmitted in both directions module and other users.
Wherein this transmitted in both directions module can be connected to this central processing unit via the RS-232 serial line interface.
Wherein this display device more comprises: lcd screen, in order to the state that shows this personal digital assistant device, the information of reception and the data of processing, wherein has a touch-control flat board on this lcd screen surface, in order to providing the user directly to press, click with data and write and carry out function with operating pen or finger; The LCD power supply device is in response to this central processing unit, so that this lcd screen electricity needs to be provided; And backlight control apparatus, respond this central processing unit, start when environment light source is not enough around, thereby make things convenient for the user to read.
Wherein above-mentioned one-way communication module more comprises: receiving antenna, in order to receive radiowave by this ISP's transmission; The RF device is in response to this receiving antenna, in order to this radiowave is demodulated to digital signal; And demoder, in response to this RF device, digital signal can be decoded according to communications protocol, and be reduced into data.
Wherein the employed communications protocol of this one-way communication module comprises POCSAG or FLEX form.
Wherein above-mentioned transmitted in both directions module is made of blue bud module.
Wherein more comprise: the both-way communication module, be coupled in this central processing unit, can carry out the transmission and the reception of two-way signaling with this ISP; And the SIM control device, be coupled in this central processing unit, can external Subscriber Identity Module (SIM card), and by the identification number that reads the user on this Subscriber Identity Module with access to your password, and provide this user to talk via this both-way communication module and other communicating ends.
The utility model is a kind of personal digital assistant device with one-way communication and transmitted in both directions function.Wherein, this personal digital assistant device has comprised an one-way communication module, in order to receive the one way signal by the ISP transmitted.And, one transmitted in both directions module such as blue bud module, can provide this personal digital assistant device and electronic product on every side to carry out the transmission and the reception of two-way signaling, and these electronic products are controlled, or download required data and program by relevant electronic equipment.In addition, a central processing unit is coupled in one-way communication module and blue bud module, in order to understand, to judge or to handle one way signal and the two-way signaling that transmits.And a memory component can be in response to the command request of central processing unit, and output is stored in data, data and application program in the memory component.So, the user can read the data of state, reception information and the processing of personal digital assistant device by the display device that is connected in central processing unit.
The utility model is a kind of personal digital assistant device that has one-way communication function and transmitted in both directions function simultaneously.By the one-way communication module that provides simultaneously about the about 285MHz of receive frequency, can make personal digital assistant device can receive information and the signal that is transmitted by the system service supplier.Simultaneously, by bidirectional transmission system, can make this personal digital assistant device and electronic product on every side carry out the exchange of signal and data, and these electronic products are controlled such as blue bud module.
Describe structure of the present utility model, feature and effect in detail below in conjunction with accompanying drawing and preferred embodiment:
The functional block diagram of the personal digital assistant device that Fig. 1 is provided according to the utility model first embodiment for demonstration with one-way communication system and transmitted in both directions module;
Fig. 2 for demonstration according to the utility model second embodiment provided have one-way communication system, transmitted in both directions module and such as the functional block diagram of the personal digital assistant device of the both-way communication module of GSM.
Fig. 3 is the circuit diagram of first central processing unit 14 (CPU) in the utility model.
Fig. 4 is the circuit diagram of memory cell 16 in the utility model, includes Mask ROM, Flash and RAM respectively.
Fig. 5 is the circuit diagram of RF in the utility model (one-way communication module 10).
Fig. 6 is the control interface circuit figure of user interface 22 in the utility model (Touch Pannel).
Fig. 7 is the LCM interface circuit figure in the utility model, and CPU is interface circuit and display device 18 couplings by this.
Fig. 8 is the circuit diagram of the RS232 interface (UART24) in the utility model.
Fig. 9 is the circuit diagram of the power supply supply 26 in the utility model.
Figure 10 is the circuit diagram of the sound interface 32 in the utility model.
Figure 11 is the circuit diagram of the SIM control 70 in the utility model.
Figure 12 is the circuit diagram of the blue bud module 28 in the utility model.
Please refer to Fig. 1, this figure shows the detailed functions calcspar of first embodiment of the utility model personal digital assistant device.What specify is, understand feature of the present utility model and the necessity of using related elements for convenience, in the description of following embodiment, and describe relation, specification and function between each element in detail, but this description partly, be not in order to qualification the utility model, and only represent the situation that preferred embodiment is provided according to the utility model.
As Fig. 1 and Fig. 3-Figure 12 shows that first embodiment of personal digital assistant device that the utility model provides.Wherein, comprise an one-way communication module 10, in order to receiving the radiowave that is transmitted by ISP 12, and be decoded into digital signal, be reduced into data again.Then, one-way communication module 10 can be sent to the data after the reduction in the central processing unit 14, to understand and to judge.This central processing unit 14 also is connected to memory component 16, so that in needs, can export required data, data or application program from memory component 16, and the data that receive are handled.Perhaps, also data that receive or the information of handling can be stored in the memory component 16 again.
Generally speaking, above-mentioned one-way communication module 10 has comprised receiving antenna, RF device and demoder.Wherein receiving antenna can receive the radiowave of aerial transmission, and is demodulated to digital signal through the RF device, is sent in the demoder again, with the communications protocol according to signal, decodes action and is reduced into data.Then can use (but being not limited to) POCSAG or FLDX form as for selected communications protocol.As for central processing unit 14, can select to have 16 bits central processing unit (CPU) of above (containing), with operational order, handle relevant data according to the user.In preferred embodiment, can select to make by Motorola, have the central processing unit of 32 bits, 68K.
In addition, in order to give full play to the function of personal digital assistant device, can store relevant application program such as stock market, finance, news, network, mobile communication, personal information in the memory component 16.In preferred embodiment, this memory component 16 comprised mask ROM (Mask ROM) 16a, flash memory (Flash RAM) 16b, with random-access memory (ram) 16c.Wherein, the memory capacity of MaskROM 16a is about 8MB, is mainly used in master datas such as storing China and British, set of digits, handwriting identification database, dictionary, and the required basic utility of system or the like.Flash RAM16b then has the capacity of 4MB-8MB approximately, except can storing the mass data of being downloaded by PC, pager or mobile phone, uses when the system executive utility also can be provided.Capacity as for RAM16c is about 1MB-2MB, is mainly used to be written into the built-in application program of carrying out, with the faster procedure execution speed.
In addition, for the user, also can control central processing unit 14, so that executive utility, store information, output desired data by operation such as user interfaces such as keyboard 20 ... Deng relative program.Perhaps, utilize the above-mentioned touch-control flat board that is positioned on the lcd screen 18b, and directly press screen, carry out every function and click or write data program with operating pen or finger.Wherein, no matter be the instruction or the data of touch-control flat board or keyboard input, all can carry out the ISN conversion via AD frequency converter 22, the signal after will changing again is sent to central processing unit 14, to cooperate relevant application program, the processing action of the line correlation of going forward side by side.
In addition, above-mentioned central processing unit 14 and be connected to UART unit (UniversalAsynchronous Receiver, Transmitter; General asynchronous reception/delivery unit) 24, so that the user can be connected personal digital assistant device with PC COM Port, and carry out serial signal transmission, and directly carry out the download of data or upload by PC or relevant electronic product.Wherein, in preferred embodiment, can use the serial line interface of RS-232 to be used as 24 uses of UART unit.
Above-mentioned personal digital assistant device more comprises power supply supply 26, links to each other with central processing unit 14 via AD frequency converter 22, to provide system operation required electric power.Generally speaking, this power supply supply 26 has comprised DC adapter and battery modules.Wherein, by using the DC adapter, directly the AC power in the junction chamber is supplied electric power, perhaps can select battery modules (lithium battery of general mobile phone) to supply electric power.And, in personal digital assistant device and built-in charging circuit and program so that after connecting voltage stabilizer, can be directly to the lithium battery action of charging.
What specify is, has the transfer function of wireless two-way in order to make this personal digital assistant device, and the bidirectional transmission system such as blue bud module 28 can be provided, and comes to link with central processing unit 14.Wherein, blue bud module 28 can carry out the transmission of numerical datas such as sound, image on the radio frequency band of 2.4-2.5GHZ.And, in blue bud module 28 and have a 48-bit address of formulating, and can be in the about 10 meters distance of scope, carry out point-to-point (point to point) or a bit to the signal transmission of multiple spot (point to broadcast) according to IEEE 802 standards.Particularly, because the volume of transmitted data of blue bud module 28 up to 1MB p.s., therefore can significantly promote the efficient of wireless two-way data transmission.In addition,, can protect by encipheror, and switch the use channel,, also can not be subjected to Electromagnetic Interference so in operation, be not easy interception into other people with the frequency of per minute 1,600 times by the signal that blue bud module 28 is sent.
Thus, by the utilization of blue bud module 28, the electronic product 30 that can make personal digital assistant device and other have the identical traffic chip produces and links.Also promptly, can make personal digital assistant device and mobile phone, computer, facsimile recorder, other PDA ... Xin Yidai information household appliances (IA) carry out the exchange of signal even, and integrate functions such as therebetween data transmission, printing, control.Particularly, because blue bud module 28 when transmitting, has direction-free characteristic.Therefore, even between personal digital assistant device and other electronic product, be not arranged in a straight line, still can transmit data wirelessly.And be unlikely to as infrared transmission, need two transmitting devices in line aligned with each other, just there is way to transmit data.And, because effective transmission scope of blue bud module 28 reaches 10 meters, so, still can carry out the transmission of data up to the speed of per second 1MB even across wall, pocket or briefcase.In preferred embodiment, can handy UART unit such as the RS-232 serial port, connect blue bud module 28 and central processing unit 14,, and the data that come and go are calculated and handle so that control the transmitted in both directions function of blue bud module 28 by managing device 14 outside the central authorities.
In addition, a sound interface 32 is connected to central processing unit 14 and blue bud module 28, to carry out the transmission of message data.Wherein, this sound interface 32 can be external microphone 34 and loudspeaker 36, and allow the user can be via the transmitted in both directions function of blue bud module 28, by such as equipment such as mobile phone, phones, talk with the user of other ends.For example, by the function of the blue bud module 28 of operation, may command user's mobile phone, and other use sides are carried out dial action by the operator of system, talk by external microphone 34 and loudspeaker 36 again.Perhaps, when the distance of using more in short-term, also can be directly come and other user links up via the double-direction radio transmission of blue bud module 28.Thus, for the user, can be under the situation of hand-free mobile phone or telephone set, the direct control personal digital assistant device, and reach the purpose of conversing with other use sides.
Please refer to Fig. 2, this figure has shown second embodiment of the present utility model.Wherein, one-way communication module 50 and blue bud module 52 are connected in series to display device 56 via central processing unit 54 respectively.So, can receive data, the information that sends by ISP 58 by one-way communication module 50.And the signal that carries out double-direction radio with other electronic product 60 with transmission chip by blue bud module 52 transmits.As for, 54 of central processing units can be according to the operational order by 62 inputs of user interfaces such as touch-control flat board or keyboard, or the signal of being imported by one-way communication module 50, blue bud module 52, and by output in the memory component 64 required data, data or application program, and the signal of handling understood, judges or carries out, be resent to display device 56 confession users and browse.
In addition, central processing unit 54 herein, except being used for handling the basic function of personal digital assistant device, and can be in conjunction with one-way communication module 50, and use (unidirectional transfering function) as the pager receiver.Or in conjunction with the transmitted in both directions module such as blue bud module 52 etc., and use (two-way transfering function) as telepilot or short-range message exchange media of household appliances.Wherein, when this personal digital assistant device is used to carry out the short distance message exchange, can connect microphone 68 and earphone (loudspeaker) 70, and talk with other use side or the exchange of data via sound interface 66.As for, memory component 64 herein, then identical with first embodiment, comprised Mask ROM 64a, FlashRAM 64b, with RAM 64c.In addition, central processing unit 54, and can be connected with the external world by UART unit 72, so that carry out the action of swap data, information.
It should be noted that because blue bud module 52 only can carry out the transmission and the exchange of data at (about about 10 meters) under short-range condition.So, in order further to promote the function that this personal digital assistant device carries out remote double-direction radio transmission, can connect both-way communication module 74 on central processing unit 54, to receive the radiowave that is transmitted by ISP 58, and with its decoding, be reduced into data, be resent to central processing unit 54, to understand and to judge.Perhaps, also data that central processing unit 54 can be transmitted via both-way communication module 74, and with the pattern of radiowave, send to ISP 58, and form the form of two-way communication.Wherein, central processing unit 54 and via SIM (Subscriber Identity Module) control device 76, and external SIM card (Subscriber Identity Module) with 16K or 32K storer so that the identification number that reads the user via SIM card with access to your password.Thus, the user just can be via microphone external on the sound interface 66 68 and loudspeaker 70, and allow the user carry out telephone talk via both-way communication module 74 with other users.Similar to one-way communication module 50, both-way communication module 74 has herein also comprised dual-mode antenna, RF device and demoder.Wherein dual-mode antenna can receive the radiowave of aerial transmission, and is demodulated to digital signal through the RF device, is sent in the demoder again, with the communications protocol according to signal, decodes action and is reduced into data.Opposite, when user's tendency to develop carry information or when conversing, then can be by user interface 62 input informations, or carry out conversation voice by sound interface 66, and pass through central processing unit 54 and both-way communication module 74 again, transmit to ISP 58.Then can use (but being not limited to) GSM, GPRS, CDMA, PHS or bi-directional call communications protocol as for selected communications protocol.
What specify is that the one-way communication module 10 and 50 in the utility model can be used as pager receiver (paging receiver) and uses, and produces the function of individual's call or broadcast data.When using as pager, its receivable information still comprises numerical data, as numeral, Chinese, English etc. except single-tone is called out.And inbound pacing that can about 1600-6400bps is come the electric wave signal of the about 284-285MHz of receive frequency.Particularly because information that pager transmitted has cheapness, a large amount of, real-time characteristic, thus for ISP 58, can be promptly in the mode of one-to-many, the information with most user is concerned about is sent to the user in real time and browses for it at the moment.
In addition, owing in the utility model, utilize blue bud module 28 and 52 to carry out the short-distance wireless transmitted in both directions, behind external microphone and loudspeaker, can carry out two-way communication with other electronic product with transmission chip.In other words, in suitable regional extent, can utilize blue bud module and wirelessly, operating handset transmits the wireless Internet data of short message, Email or any WAP specification.Or come data download, information wirelessly to personal digital assistant device via mobile phone, to provide the user to browse or to utilize.Person more by utilizing blue bud module, and can make personal digital assistant device produce with various electronic product on every side to get in touch, and so the user can control and operate these electronic products with transmission chip by the operation personal digital assistant device.For example, when the user needs, can carry out the exchange of information with other users' personal digital assistant device directly by the transmitted in both directions function of blue bud module.Perhaps, can utilize personal digital assistant device to come the various household electrical appliances that make user's periphery have the transmission chip are operated.
As in second embodiment of the present utility model, then except using the two-way blue bud module 52 of one-way communication module 50 and short distance, more used both-way communication module 74, respond central processing unit 54 and SIM control device 76, and the function of generation Global Link digital mobile phone (GSM, G1obal Systemfor Mobile communi cation).Wherein, when personal digital assistant device started, central processing unit 54 was just by SIM control device 76, and the relevant information on the reading SIM card again by both-way communication module 74, is linked up and registration with radiowave and ISP 58.Then, just keep with ISP 58 sustainably and link and receive or transmit data.This both-way communication module 74 and three functions frequently that can support 900MHz, 1800MHz and 1900MHz simultaneously, and can use GPRS (General Package Radio Service) and promote data rate and arrive per second 44K-115K.So, can transmit the wireless Internet data of any WAP (Wireless Application Protocal) specification easily, and make the personal digital assistant device of the present utility model can be according to the needs of surrounding environment and condition, select to use blue bud module 52 or both-way communication module 74, even both carry out the fast and exchange of biography of information in conjunction with this.
Claims (10)
1, a kind of personal digital assistant device with one-way communication and transmitted in both directions function, it is characterized in that: this personal digital assistant device comprises: the one-way communication module, in order to receive one way signal by the ISP transmitted; The transmitted in both directions module can make this personal digital assistant device and electronic product on every side carry out wireless and direction-free two-way signaling and transmit and receive; Central processing unit is coupled in this one-way communication module and this transmitted in both directions module respectively, in order to understand, to judge and to handle this one way signal and this two-way signaling; Memory component in response to the requirement of this central processing unit, and transmits data, data and the application program be stored in this memory component to this central processing unit; And display device, be coupled in this central processing unit, in order to the state that shows this personal digital assistant device, the information of reception and the data of processing.
2, the personal digital assistant device with one-way communication and transmitted in both directions function as claimed in claim 1, it is characterized in that: wherein above-mentioned memory component comprises at least: mask ROM, in order to master database and the built-in application program that stores this personal digital assistant device; Flash memory in order to storing the data that received by this one-way communication module and this transmitted in both directions module, and uses when this central processing unit executive utility is provided; And random access memory, in order to be written into this built-in application program of carrying out, to accelerate the execution speed of this central processing unit.
3, the personal digital assistant device with one-way communication and transmitted in both directions function as claimed in claim 1, it is characterized in that: wherein more comprise a user interface, be connected in this central processing unit, in order to control this central processing unit executive utility, store information, output data.
4, the personal digital assistant device with one-way communication and transmitted in both directions function as claimed in claim 1, it is characterized in that: wherein more comprise a sound interface, be coupled in this central processing unit and this transmitted in both directions module respectively, can external microphone and loudspeaker, so that the user can talk via this transmitted in both directions module and other users.
5, the personal digital assistant device with one-way communication and transmitted in both directions function as claimed in claim 1, it is characterized in that: wherein this transmitted in both directions module can be connected to this central processing unit via the RS-232 serial line interface.
6, the personal digital assistant device with one-way communication and transmitted in both directions function as claimed in claim 1, it is characterized in that: wherein this display device more comprises: lcd screen, in order to the state that shows this personal digital assistant device, the information of reception and the data of processing, wherein has a touch-control flat board on this lcd screen surface, in order to providing the user directly to press, click with data and write and carry out function with operating pen or finger; The LCD power supply device is in response to this central processing unit, so that this lcd screen electricity needs to be provided; And backlight control apparatus, respond this central processing unit, start when environment light source is not enough around.
7, the personal digital assistant device with one-way communication and transmitted in both directions function as claimed in claim 1, it is characterized in that: wherein above-mentioned one-way communication module more comprises: receiving antenna, in order to receive radiowave by this ISP's transmission; The RF device is in response to this receiving antenna, in order to this radiowave is demodulated to digital signal; And demoder, in response to this RF device, digital signal can be decoded according to communications protocol, and be reduced into data.
8, the personal digital assistant device with one-way communication and transmitted in both directions function as claimed in claim 1 is characterized in that: wherein the employed communications protocol of this one-way communication module comprises POCSAG or FLEX form.
9, the personal digital assistant device with one-way communication and transmitted in both directions function as claimed in claim 1 is characterized in that: wherein above-mentioned transmitted in both directions module is made of blue bud module.
10, the personal digital assistant device with one-way communication and transmitted in both directions function as claimed in claim 1, it is characterized in that: wherein more comprise: the both-way communication module, be coupled in this central processing unit, can carry out the transmission and the reception of two-way signaling with this ISP; And the SIM control device, be coupled in this central processing unit, can external Subscriber Identity Module (SIM card), and by the identification number that reads the user on this Subscriber Identity Module with access to your password, and provide this user to talk via this both-way communication module and other communicating ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01200553 CN2463879Y (en) | 2001-01-12 | 2001-01-12 | Personal digital assistant device with one-way communication and two-way transmission function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01200553 CN2463879Y (en) | 2001-01-12 | 2001-01-12 | Personal digital assistant device with one-way communication and two-way transmission function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2463879Y true CN2463879Y (en) | 2001-12-05 |
Family
ID=33622815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01200553 Expired - Lifetime CN2463879Y (en) | 2001-01-12 | 2001-01-12 | Personal digital assistant device with one-way communication and two-way transmission function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2463879Y (en) |
-
2001
- 2001-01-12 CN CN 01200553 patent/CN2463879Y/en not_active Expired - Lifetime
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Expiration termination date: 20110112 Granted publication date: 20011205 |