Apparatus and method for communicating with moving receivers
First Claim
1. An apparatus for communicating with mobile receivers comprising:
- a transmitter configured to transmit compressed data in burst mode over a selected localized area;
a plurality of receivers configured to receive said transmitted data; and
,a sensing device capable of measuring the speed of at least one of said receivers relative to said transmitter,wherein said transmitter is further configured to modify at least one parameter of said transmission in response to said speed measurement.
0 Assignments
0 Petitions
Accused Products
Abstract
An apparatus for communicating with mobile receivers for emergency notification and other purposes comprises a localized (low power) transmitter capable of transmitting short bursts of compressed audio or video messages over a selected spatial range. The apparatus further contains a means of measuring the relative speed of the transmitter and receiver(s) and adjusting the transmission accordingly (for example by increasing the output power, shortening the burst length, or increasing the burst repetition rate). In this way, the effective “footprint” of the transmitter and/or the message length is matched to the time the receiver(s) pass within range of the transmitter so that each receiver is able to capture at least one complete burst in the available time. The transmitter may be relatively fixed, for instance on a highway overpass, for communicating with vehicles passing on the highway. Alternatively, the transmitter may be mounted on an emergency vehicle to warn vehicles ahead or on intersecting roads that the emergency vehicle is approaching. In this case, the transmitter may adjust its effective range based on the speed of the emergency vehicle itself.
-
Citations
16 Claims
-
1. An apparatus for communicating with mobile receivers comprising:
-
a transmitter configured to transmit compressed data in burst mode over a selected localized area; a plurality of receivers configured to receive said transmitted data; and
,a sensing device capable of measuring the speed of at least one of said receivers relative to said transmitter, wherein said transmitter is further configured to modify at least one parameter of said transmission in response to said speed measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An apparatus for communicating with mobile receivers comprising:
-
a mobile transmitter configured to transmit compressed data in burst mode over a selected localized area; a plurality of receivers; and
,a sensing device configured to measure the speed of said mobile transmitter, wherein said transmitter is further configured to modify at least one parameter of said transmission in response to said speed measurement. - View Dependent Claims (9, 10, 11, 12)
-
-
13. A method for communicating with mobile receivers comprising the steps of:
-
a. compressing a selected message sufficiently to allow said message to be transmitted in burst mode in less than about two seconds at a selected frequency; b. operating a transmitter in burst mode at a selected power level that defines a selected effective range; c. measuring the relative speed of said transmitter and at least one of said receivers; and
,d. adjusting at least one transmission parameter of said transmitter in response to said relative speed. - View Dependent Claims (14, 15, 16)
-
Specification