US3884086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio dosimeter
Assignee: Ball Corp
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Filing: 1973-07-27
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Granted: 1975-05-20
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Expires: 1993-07-27
Abstract
Abstract An audio dosimeter for determining the exposure to noise as a function of both time and noise level. Input sound energy is appropriately weighted so as to account for the effect thereof on the human ear. The weighted sound signal is then utilized to gate pulses of selected discrete frequency levels to a counter, such that as the sound level increases, correspondingly higher frequency pulses are coupled to the counter. The counter stores the count therein until read out by an appropriate display device.
Inventors
- 👤 James O Steger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:51
CPC Classifications
G; G01; G01H; G01H3/00; G01H3/10; G01H3/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
An audio dosimeter means for sensing and converting sound to an electrical signal representing said sound, weighted filter means for filtering said signal, said filter having a frequency response which approximates the human ear frequency response, means for generating a DC voltage having a magnitude that is proportional to the filtered output of said weighted filter, voltage divider means including a plurality of output terminals for dividing said DC voltage, a plurality of comparator means each being connected to one of said output terminals of said voltage divider, each succeeding comparator generating an output when said DC voltage raises by a predeteRmined magnitude, a source of clock pulses, a divider means having multiple outputs for providing sequentially decreasing discrete frequency outputs, a plurality of gating means one each connected to an output of said divider, each being enabled by the output of an associated comparator to gate said pulses from said divider to said counter, and means for reading out the count of said counter.
Claim 2
Dependent Claim
165 words
An audio dosimeter means for sensing and converting sound to an electrical signal representing said sound, weighted filter means for filtering said signal, said filter having a frequency response which approximates the human ear frequency response, means for generating a DC voltage having a magnitude that is proportional to the filtered output of said weighted filter, voltage divider means including a plurality of output terminals for dividing said DC voltage, a plurality of comparator means each being connected to one of said output terminals of said voltage divider, each succeeding comparator generating an output when said DC voltage raises by a predeteRmined magnitude, a source of clock pulses, a divider means having multiple outputs for providing sequentially decreasing discrete frequency outputs, a plurality of gating means one each connected to an output of said divider, each being enabled by the output of an associated comparator to gate said pulses from said divider to said counter, and means for reading out the count of said counter.
Claim 3
Dependent Claim
19 words
The audio dosimeter of claim 1 further comprising: means for indicating when said counter has reached a predetermined level.
Claim 4
Dependent Claim
21 words
The audio dosimeter of claim 1 wherein each succeeding comparator generates an output when the input noise level raises by 5dB(A).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |