US3789952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise dosimeter
Assignee: Individual
•
Filing: 1972-05-15
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Granted: 1974-02-05
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Expires: 1992-05-15
Abstract
Abstract A noise dosimeter having noise pick-up means for generating an analog signal in correspondence to picked-up noise, signal processing means for generating pulses in correspondence to the analog signal, and means for adding and storing the pulses.
Inventors
- 👤 L Widegren
- 👤 T Keskitalo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:08
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/26; G01H; G01H3/00; G01R19/00; G01R19/25; G01R19/252
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A noise dosimeter comprising in combination, a microphone responsive to noise for generating a corresponding electrical noise signal, filter circuit means receiving said electrical noise signal, squaring circuit means including in series a logarithmic-doubler circuit means followed by an anti-logarithmic circuit means, said squaring circuit means connected to receive the output of said filter circuit means, polarity inverting circuit means operatively associated with said squaring circuit means and responsive to signals of one polarity to provide output signals of the opposite polarity to ensure thereby that the output of said squaring circuit means is of the same predetermined polarity irrespective of the polarity of the input signals applied thereto, an integrator for integrating the output of said squaring circuit, a voltage-frequency convertor responsive to the output of said integrator, and a pulse summing circuit for summing the output of said converter.
Claim 2
Dependent Claim
141 words
A noise dosimeter comprising in combination, a microphone responsive to noise for generating a corresponding electrical noise signal, filter circuit means receiving said electrical noise signal, squaring circuit means including in series a logarithmic-doubler circuit means followed by an anti-logarithmic circuit means, said squaring circuit means connected to receive the output of said filter circuit means, polarity inverting circuit means operatively associated with said squaring circuit means and responsive to signals of one polarity to provide output signals of the opposite polarity to ensure thereby that the output of said squaring circuit means is of the same predetermined polarity irrespective of the polarity of the input signals applied thereto, an integrator for integrating the output of said squaring circuit, a voltage-frequency convertor responsive to the output of said integrator, and a pulse summing circuit for summing the output of said converter.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |