 Combined keypad and protective cover |
| OF THE PREFERRED EMBODIMENTS FIG. 1 shows a personal intelligent communicator of the background ... |
|
| Method and system for indicating link quality among neighboring wireless base station |
| A method for indicating the quality of the links between wireless base stations is described in ... |
|
| Receiver having capability of selective storage of received message |
| It is an object of the invention to provide a receiver capable of selectively storing a desired ... |
|
| Communication device having multiple displays and method of operating the same |
| OF THE PREFERRED EMBODIMENTS According to the present invention, a portable communication device ... |
|
| Billing records enhanced by called party names from subscriber phone book |
| The inventors of the current invention have realised that conventional billing approaches are ... |
|
| Selective call receiver having a variable frequency vibrator |
| Briefly, according to the invention, a electronic device comprises a receiver for receiving a ... |
|
| Electromagnetic radiation alerting device for use with a cellular telephone |
| The striking deficiencies of existing technologies, outlined above, lead to the inescapable ... |
|
| Foldable portable terminal |
| The invention claimed is: 1. A portable terminal comprising: a first cabinet comprising a display ... |
|
|
Cellular telephone interface system for AMPS and CDMA data services
| Details |
Inventors: Willkie, James J.; Phillips, Marc S.; Doan, David B.;
Assignee: Qualcomm Incorporated (San Diego, CA)
Primary Examiner: Dolinar; Andrew M.
Assistant Examiner:
Attorney, Agent or Firm: Miller; Russell B., Edmonston; Brian S., Brown; Charles D.
The cellular telephone interface system has the capability to automatically choose between AMPS and CDMA cellular transmission protocols for data transmissions. The cellular telephone interface system includes a PC-modem card, such as a PCMCIA card, for interconnecting the cellular telephone to a data source, such as a laptop computer, portable facsimile machine, or the like. The cellular telephone is capable of transmission in accordance with either AMPS or CDMA transmission protocols. For AMPS, the PC-modem card converts data signals received from the data source into PCM signals for forwarding to the cellular telephone. The cellular telephone converts the PCM signals into AMPS formatted signals for transmission to a local cellular base station. For CDMA transmission, the PC-modem card converts the data signals received from the data source into RS-232E signals for transmission to the cellular telephone. The cellular telephone converts the RS-232E signals into CDMA formatted signals for transmission to the local base station. A variety of data formatting and data compressing protocols are also provided including TCP, IP, PPP and V42.bis. In one embodiment, hardware and software for implementing the protocols are provided primarily within the PC-modem card to thereby reduce the cost, size and power consumption of the cellular telephone itself. In another embodiment, hardware and software for implementing the TCP, IP and PPP protocols are provided within the cellular telephone. Method and apparatus embodiments of the invention are disclosed. |
|
DETAILED DESCRIPTION In accordance with the invention, a cellular telephone system for transmitting data received from a data source, such as a laptop computer or facsimile machine, to a local cellular base station using either AMPS or CDMA protocols is provided.
In an exemplary embodiment, the system includes a personal computer accessory "PC-modem" card, such as a PCMCIA card, for connecting the data source to a cellular telephone.
The PC-modem card includes means for transferring data between the data source and the cellular telephone.
In an AMPS mode, the data is transferred as pulse code modulated (PCM) signals.
In a CDMA mode, the data is transferred as RS-232E signals.
The cellular telephone includes AMPS processing means for receiving PCM data from the PC-modem card and transmitting the data using AMPS format signals to a local base station.
The cellular telephone also includes CDMA processing means for receiving RS-232 data from the PC-modem card and transmitting the data using CDMA format signals to the base station.
A single interconnection cable interconnects the PC-modem card and the cellular telephone.
The single connection line includes individual lines for carrying both PCM signals and RS-232E signals.
Hence, only a single connection port on the cellular telephone is required.
Also, only a single connection port (the PCMCIA card slot) is required on the laptop computer.
In one embodiment, the means for transferring data between the data source and the cellular telephone includes means, including an AT control system, for interpreting AT commands, which are well known in the art, a data processing unit, a modem, and a CODEC (coder-decoder), for converting signals received from the data source into PCM tone signals suitable for transmission to the cellular telephone while in the AMPS mode.
The use of PCM tones facilitates manipulation and processing of the associated data and therefore is preferred, however, uncoded analog data samples may also be used in alternative embodiments of the invention
|
|
Ring Tones 
