Programmable electronic siren

Details Programmable electronic siren Programmable electronic siren

G - Physics

10

K

84/1.1

G10K 7/00 (2006.01) G08B 3/10 (2006.01) G10K 15/02 (2006.01)

Patent

CA 1068139

Abstract of the Disclosure A dynamic loudspeaker is driven by chopped d.c. from the collector of a transistor. A free wheeling diode is con- nected in parallel with the speaker circuit to dissipate the inductive energy in the speaker voice coil when the transistor is turned off. The transistor is controlled by a voltage con- trolled oscillator which, under control of other elements, can be made to produce a wide variety of cyclically varying output signals for producing a wide range of sounds, tones and signals from the loudspeaker. This permits selection of a tone which differs sufficiently from the ambient noise to assure attracting attention. By the use of chopped d.c. to drive the speaker, the expense, weight and bulk of an impedance matching transformer is eliminated. A plurality of individually operable switches are provided for switching circuit elements in and out of circuit to modify wave shapes and alter sound output. Another group of in- dividually operable switches mixes selected wave shapes to pro- duce various compound waves and produce additional sound vari- ations. One switch provides pitch control and another provides output volume control.

277685

Affiliated with

Also associated with

Rating

Programmable electronic siren does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Programmable electronic siren, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable electronic siren will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1132178