Encoder/decoder for emergency alert system
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United States of America Patent
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-
Nov 30, 1999
Grant Date -
N/A
app pub date -
Jan 28, 1997
filing date -
Jan 28, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An encoder/decoder for an emergency alert system to enable broadcasters to receive, store, re-broadcast and originate emergency alert messages. Multiple emergency alert signals are received by the encoder/decoder. A digital signal processor of the encoder/decoder scans the reception of the multiple emergency alert messages to determine the presence of an incoming emergency alert signal. The digital signal processor provides digital implementation of a frequency shift key modulation and a frequency shift key demodulation to encode and decode emergency alert messages. Additionally, the digital signal processor functions as a central processing unit to control input/output ports over a digital signal processor bus for performing all encoding and decoding functions and to control all encoding and decoding functions.
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