US4088995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for selectively operable dual simultaneous siren broadcast from a single speaker
Assignee: International Telephone and Telegraph Corp
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Filing: 1977-02-25
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Granted: 1978-05-09
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Expires: 1997-02-25
Abstract
Abstract A system for broadcasting two siren sounds simultaneously over a single speaker. This function is performed by adding or subtracting the signals.
Inventors
- 👤 C. Alfred Paladino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:38
CPC Classifications
G; G08; G08B; G08B3/00; G08B3/10; G10; G10H; G10H1/00; G10H1/18; G10H1/26; G10H1/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A sound communication system comprising: a first modulating oscillator having a first output lead, said first modulating oscillator producing a first signal on said first output lead thereof; a second modulating oscillator having a second output lead, said second modulating oscillator producing a second signal on said second output lead thereof, different from said first signal; a first voltage controlled oscillator (VCO) having a first input lead and a third output lead, said first VCO producing a third signal on said third output lead; a second VCO having a second input lead and a fourth output lead, said second VCO producing a fourth signal on said fourth output lead; a loudspeaker having an input lead, said first output lead being connected to said first input lead, said second output lead being connected to said second input lead; and means connected from said third output lead and said fourth output lead to said loudspeaker input lead for impressing a signal upon said loudspeaker input lead directly proportional to the sum of said third and fourth signals.
Claim 2
Dependent Claim
175 words
A sound communication system comprising: a first modulating oscillator having a first output lead, said first modulating oscillator producing a first signal on said first output lead thereof; a second modulating oscillator having a second output lead, said second modulating oscillator producing a second signal on said second output lead thereof, different from said first signal; a first voltage controlled oscillator (VCO) having a first input lead and a third output lead, said first VCO producing a third signal on said third output lead; a second VCO having a second input lead and a fourth output lead, said second VCO producing a fourth signal on said fourth output lead; a loudspeaker having an input lead, said first output lead being connected to said first input lead, said second output lead being connected to said second input lead; and means connected from said third output lead and said fourth output lead to said loudspeaker input lead for impressing a signal upon said loudspeaker input lead directly proportional to the sum of said third and fourth signals.
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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |