초록 ▼

A device for wireless, secure transmission of digital information signals utilizing carrier sense multiple access (CSMA) packet communications, or spread spectrum code division multiple access (CDMA) circuits, between a plurality of stations. The device is intended for use within motor vehicles. The

A device for wireless, secure transmission of digital information signals utilizing carrier sense multiple access (CSMA) packet communications, or spread spectrum code division multiple access (CDMA) circuits, between a plurality of stations. The device is intended for use within motor vehicles. The digital information signals may be data or compressed voice signals. Each device operates using a visual network access schema under which the operator of each station manually enters, into the device keyboard, the license plate number of the Target vehicle to be contacted. The license plate number of the Target motor vehicle is used by the Sender device to identify the transmission parameters to the Target device. These parameters are the network address, data link address, frequency channel, code division multiple access (CDMA) code, and encryption key. A Target device uses its own license plate number and that of the Sender vehicle to identify the transmission parameters for delivering a response. Each device contains two receive channels; one for reception of broadcast packet messages or CDMA circuits, and the other for directed packet messages, including signalling messages for the CDMA circuits. To support broadcast messages, the use of a pseudo license plate number, or common address, is entered by the operator of the Sender device. A preferred set of broadcast addresses supports specific types of broadcasts, such as, emergency distress messages (“EBROAD”), traffic reports (“TBROAD”), or general broadcast messages (“GBROAD”). The device consists of ten major components.

대표청구항 ▼

A device for two-way communications of digital information signals over an electromagnetic medium between geographically separate and distinct entities, each said entity being equipped with said device and identifiable by a unique alpha-numeric identifier; said device consisting of a man-machine int

A device for two-way communications of digital information signals over an electromagnetic medium between geographically separate and distinct entities, each said entity being equipped with said device and identifiable by a unique alpha-numeric identifier; said device consisting of a man-machine interface means, a message processor means, a communications control processor means, and a transceiver means; said man-machine interface means providing a mechanism for input of said alpha-numeric entity identifiers and information from said operator; said man-machine interface means communicating with said message processor for transfer of said alpha-numeric entity identifiers and operator-entered information; said message processor means providing a menu generation and control function for said man-machine interface means, and a function for formatting of said operator-entered information; said message processor means interfaces with said communications control processor means for transfer of said alpha-numeric entity identifiers and said operator-entered information; said communications control processor means providing a function for reformatting said operator-entered information received from said message processor means and said transceiver means, a function for identifying network communications parameter values from said alpha-numeric entity identifiers, and a function for configuring transceiver subsystems with said network communications parameter values; said communications control processor means interfaces with said transceiver means for conveyance of said operator-entered message information and said network communications parameter values; said transceiver means comprising a link control unit means, a digital modem unit means, and a radio frequency unit means to support electro-magnetic communications between devices.