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US4086589A Expired / Lapsed US ⏱️ 0.0 years remaining

Audible electronic warning system

Assignee: INDUSTRIAL ELECTRONICS SERVICE Co
•
Filing: 1977-03-10
•
Granted: 1978-04-25
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Expires: 1997-03-10
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Abstract

Abstract This invention is an electronic siren producing a siren sound having a sound wave produced on a slowly rising and falling frequency. A major cycle is pulsed at intervals with variations in frequency. The variations in each major cycle represent minor cycles. The invention utilizes an electronic circuit to effect such major and minor frequency cycles with existing speaker equipment to project the sound. The electronic circuit includes one or more complex variable rate pulse oscillators wherein the variability of the oscillator is flexible so that it can be programmed internally, or controlled by the speed of the vehicle, or controlled by an operator, or dependent on other circuitry in the unit, or random. The present circuit has for its purpose to combine, superimpose, add, mix, or multiply, various signals from audio sweep oscillators in the circuitry including a plurality of such oscillators with the outputs thereof combined particularly by mixing means which includes multiplexing and simultaneous mixing as well.

Inventors

  • 👤 Richard F. Cieslak
  • 👤 John V. Balding

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 21:14
CPC Classifications
G; G08; G08B; G08B3/00; G08B3/10; B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0269; B06B1/0284

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 83 words
An electronic siren system including a first timing oscillator and a shaping network, a second timing oscillator and a shaping network, a mixing means, and first and second sweep oscillators, said first and second timing oscillators and shaping networks directing their respective outputs to the respective first and second sweep oscillators, and said sweep oscillators directing their outputs to said mixing means, said mixing means combining the audio outputs from the respective sweep oscillators and delivering the combined output to an audio stage.
Claim 2
Dependent Claim 83 words
An electronic siren system including a first timing oscillator and a shaping network, a second timing oscillator and a shaping network, a mixing means, and first and second sweep oscillators, said first and second timing oscillators and shaping networks directing their respective outputs to the respective first and second sweep oscillators, and said sweep oscillators directing their outputs to said mixing means, said mixing means combining the audio outputs from the respective sweep oscillators and delivering the combined output to an audio stage.
Claim 3
Dependent Claim 17 words
An electronic siren system as set forth in claim 1 wherein said mixing means comprises a multiplexer.
Claim 4
Dependent Claim 22 words
An electronic siren system as set forth in claim 2 wherein a multiplex rate clock regulates the multiplexing action of said multiplexer.
Claim 5
Dependent Claim 38 words
An electronic siren system as set forth in claim 1 wherein each of said sweep oscillators is in a separate circuit including a timing oscillator and a second oscillator, and said shaping networks are disposed in said circuits.
Claim 6
Dependent Claim 39 words
An electronic siren system as set forth in claim 3 wherein each of said sweep oscillators is disposed in a separate circuit including a timing oscillator and a variable oscillator, and said shaping networks are disposed in said circuits.
Claim 7
Dependent Claim 44 words
An electronic siren system as set forth in claim 1 wherein one of said sweep oscillators is in a separate circuit including a timing oscillator and a second oscillator, said shaping network associated with said one sweep oscillator being disposed in said separate circuit.
Claim 8
Dependent Claim 17 words
An electronic siren system as set forth in claim 6 wherein said mixing means comprises a multiplexer.
Claim 9
Dependent Claim 22 words
An electronic siren system as set forth in claim 7 wherein a multiplex rate clock regulates the multiplexing action of said multiplexer.

References Cited (Backward Citations)

US3747092A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-04-24 1981-10-24 1982-04-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-04-24 1985-10-24 1986-04-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-04-24 1989-10-24 1990-04-25 $7700.00 Window Closed / Lapsed

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