G - Physics
08
G
349/1, 349/29, 3
G08G 1/07 (2006.01) G08G 1/087 (2006.01)
Patent
CA 1322586
SIREN DETECTOR Abstract of the Disclosure A siren detector for detecting siren sounds which precess at known yelp, wail and high-low warble rates within a selected frequency band. A transducer detects siren sounds and produces a corresponding elec- trical output signal. The output signal is filtered to reject signal frequencies outside the selected frequency band. The signal amplitude is monitored and varied as required to produce a constant amplitude output signal. The constant amplitude output signal is low pass fil- tered for detection of siren high-low sounds and is also low pass filtered for detection and output of precession signals which pass through a selected centre frequency. Subsequent filters are provided for detecting signals which vary at the wail and yelp warble rates. Wail, high-low and yelp warble rate signals output by the var- ious filters respectively trigger don't walk and yelp clock generators which in turn drive don't walk and red light output flip-flops respectively. Operation of the red light output flip-flop is controlled by a delay mechanism which provides a further filtration level to prevent false triggering.
575871
Hargrove J. Lloyd
Shaw Brian
Oyen Wiggs Green & Mutala Llp
Traffic Systems L.l.c.
LandOfFree
Siren detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Siren detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Siren detector will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1259827