Apparatus for warning of approaching emergency vehicle and metho

Details Apparatus for warning of approaching emergency vehicle and metho Apparatus for warning of approaching emergency vehicle and metho

1993-03-15

1994-01-11

Peng, John K.

Communications: electrical

External condition vehicle-mounted indicator or alarm

Transmitter in another vehicle

340903, 340904, 340906, 367199, G08G 100

Patent

active

052785530

ABSTRACT:
A method and apparatus for warning a motor vehicle operator of an approaching emergency motor vehicle having a sounding siren. The method comprehends selecting two frequencies A'-B' that fall within the siren frequency range and providing a microphone for detecting the sound signals including the siren signals and filtering out the electrical siren signals by a band pass filter. The selected A' and B' frequency signals are individually detected to provide output indications thereof representative of an A'-B' frequency transition. The output indications are processed for determining the preselected number of frequency transitions and producing a warning signal representative of the approaching emergency vehicle. The warning signal is utilized to give the motor vehicle operator an audible alarm and/or a visible alarm and deenergizing the motor vehicle's sound system.

REFERENCES:
patent: 3568144 (1971-03-01), Streb
patent: 3859623 (1975-01-01), Koehler
patent: 4158190 (1979-06-01), Stefanov
patent: 4238778 (1980-12-01), Ohsumi
patent: 4380004 (1983-04-01), Coats et al.
patent: 4587522 (1986-05-01), Warren
patent: 4625206 (1986-11-01), Jensen
patent: 4747064 (1988-05-01), Johnston
patent: 4785474 (1988-11-01), Bernstein
patent: 4794394 (1988-12-01), Halstead
patent: 4864297 (1989-09-01), Shaw et al.
patent: 4956866 (1990-09-01), Bernstein et al.
patent: 6806931 (1989-02-01), Nelson

Affiliated with

Also associated with

Rating

Apparatus for warning of approaching emergency vehicle and metho does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for warning of approaching emergency vehicle and metho, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for warning of approaching emergency vehicle and metho will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1634131