US3889256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control for audible electronic warning system
Assignee: METROCOM COMMUNICATIONS Inc A CORP OF
•
Filing: 1973-07-09
•
Granted: 1975-06-10
•
Expires: 1993-07-09
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.
Inventors
- 👤 Richard F Cieslak
- 👤 John V Balding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:58
CPC Classifications
G; G08; G08B; G08B3/00; G08B3/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
253 words
An electronic siren including an audio speaker and an amplifier for producing sound at continual maximum audio output from said speaker in response to frequency variations transmitted to said amplifier, including frequency respOnsive amplifying means for an audio speaker, a voltage controlled sweep oscillator circuit for supplying a variable frequency to said amplifying means to provide frequencies distinguished from ambient sounds, modulating means for supplying a variable control voltage to said oscillator circuit, a timing oscillator circuit, said timing oscillator circuit including variable and settable means for supplying a pulsating voltage, a shaping network for changing the pulsating voltage of said oscillator circuit into a slowly rising and falling voltage which repeats in a cyclic manner, a variable rate pulse oscillator controlled by the output of said shaping network, a second shaping network for shaping the output of said variable rate pulse oscillator circuit means for imposing a varying cyclic voltage from said second shaping network on the voltage wave form supplied by said first shaping network in said modulating means to thereby produce a number of periodically rising and falling minor voltage variation on the main voltage wave supplied to said sweep oscillator circuit to thereby produce an amplifier control frequency having the characteristic of a cyclically recurring, slowly rising and falling main frequency of sound occurring over a preselected interval of time and a number of rising and falling minor frequencies occurring within said major frequency variation during each cycle of said main frequency while it is at maximum continual level.
Claim 2
Dependent Claim
253 words
An electronic siren including an audio speaker and an amplifier for producing sound at continual maximum audio output from said speaker in response to frequency variations transmitted to said amplifier, including frequency respOnsive amplifying means for an audio speaker, a voltage controlled sweep oscillator circuit for supplying a variable frequency to said amplifying means to provide frequencies distinguished from ambient sounds, modulating means for supplying a variable control voltage to said oscillator circuit, a timing oscillator circuit, said timing oscillator circuit including variable and settable means for supplying a pulsating voltage, a shaping network for changing the pulsating voltage of said oscillator circuit into a slowly rising and falling voltage which repeats in a cyclic manner, a variable rate pulse oscillator controlled by the output of said shaping network, a second shaping network for shaping the output of said variable rate pulse oscillator circuit means for imposing a varying cyclic voltage from said second shaping network on the voltage wave form supplied by said first shaping network in said modulating means to thereby produce a number of periodically rising and falling minor voltage variation on the main voltage wave supplied to said sweep oscillator circuit to thereby produce an amplifier control frequency having the characteristic of a cyclically recurring, slowly rising and falling main frequency of sound occurring over a preselected interval of time and a number of rising and falling minor frequencies occurring within said major frequency variation during each cycle of said main frequency while it is at maximum continual level.
Claim 3
Dependent Claim
102 words
An electronic siren system having an audio section projecting a square form sound wave at continual maximum audio output, electronic means for generating said sound wave of square form and slowly rising and falling frequency on a major cycle different from that of predominant ambient sound, and electronic means to pulse said major cycle and generate minor cycles to produce variable frequencies in said sound wave, said audio output being varied in rate and direction of frequency change represented by said minor cycles to change the frequency rate while it is at maximum continual level whereby to simulate a changing audio level.
Claim 4
Dependent Claim
102 words
An electronic siren system having an audio section projecting a square form sound wave at continual maximum audio output, electronic means for generating said sound wave of square form and slowly rising and falling frequency on a major cycle different from that of predominant ambient sound, and electronic means to pulse said major cycle and generate minor cycles to produce variable frequencies in said sound wave, said audio output being varied in rate and direction of frequency change represented by said minor cycles to change the frequency rate while it is at maximum continual level whereby to simulate a changing audio level.
Claim 5
Dependent Claim
39 words
An electronic siren system as set forth in claim 2 wherein said means for generating said sound wave includes an electronic circuit, and said means to pulse said major cycle includes a variable rate pulse oscillator in said circuit.
Claim 6
Dependent Claim
32 words
An electronic siren system as set forth in claim 3 wherein said electronic circuit includes a shaping network imposed on said major cycle, and a shaping metwork imposed on said minor cycles.
Claim 7
Dependent Claim
27 words
An electronic siren system as set forth in claim 3 wherein said electronic circuit includes a timing oscillator for applying a variable frequency to said sound wave.
Claim 8
Dependent Claim
32 words
An electronic siren system as set forth in claim 5 wherein said electronic circuit includes a shaping network imposed on said major cycle, and a shaping network imposed on said minor cycles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |