Annunciator system with mobile receivers
US5784006A · kind A · utility
Inventor
Key dates
| Filing date | Jul 5, 1996 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Jul 5, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H20/61
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system for annunciating traffic information includes a plurality of stationary transmitters (42,46) for generating relatively short range, highly directional beam signals (44,48) containing a burst data stream signal (10) to each of a plurality of mobile receivers (50,52,54). The stationary transmitter (42) includes a transmitter (42a) connected to a transmitter antenna (56) for generating the beam signal (44) and to a transmitter control (60) which is connected to a transmitter memory (68) for storing a plurality of compressed data voice messages which are read by the transmitter control and generated as data packet signals (16,20,22) in the burst data stream signal (10). The mobile receiver (54) includes a receiver antenna (58) for receiving the beam signal (44), a receiver (54a) for separating the burst data stream signal (10) from the beam signal, a receiver control (70) for reading the data packet signals, a data decompression circuit (72) for decompressing the data packet signals and an audio playback device (78) for audibly reproducing the messages. A traffic signal (36) connected to the transmitter control (60) generates traffic signal state signals which are generated as…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.