Patent US3729598A successfully refreshed from Google Patents.
US3729598A
Expired / Lapsed
US
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Earphone receiver attenuation measurement technique
Assignee: United States Department of the Navy
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Filing: 1971-11-11
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Granted: 1973-04-24
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Expires: 1991-11-11
Abstract
Abstract A system for measuring the effectiveness of the sound attenuating function of an earphone sound attenuation cover by employing the earphone transducer as a microphone and measuring the noise level with the ear cover in place on the user''s ear and with the cover removed, the difference in decibels being interpreted as the acoustic attenuation provided by the ear cover.
Inventors
- 👤 R Tegt
- 👤 D Robertson
- 👤 T Blattel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:04
CPC Classifications
H; H04; H04R; H04R29/00; A; A61; A61F; A61F11/00; A61F11/06; A61F11/14; A61F11/145; H04R1/00; H04R1/10; H04R1/1008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
A method for measuring the sound attenuating effectiveness and seal fit of an earphone ear cover in a noise environment, comprising the steps of: a. using an earphone as a microphone to transmit the noise level within the ear cover, first, with the ear cover in place on the user, and second, with the ear cover removed; b. measuring the output transmitted by the transducer in both instances, the difference between the outputs being the acoustic attenuation provided by the ear cover.
Claim 2
Independent Claim
82 words
A method for measuring the sound attenuating effectiveness and seal fit of an earphone ear cover in a noise environment, comprising the steps of: a. using an earphone as a microphone to transmit the noise level within the ear cover, first, with the ear cover in place on the user, and second, with the ear cover removed; b. measuring the output transmitted by the transducer in both instances, the difference between the outputs being the acoustic attenuation provided by the ear cover.
Claim 3
Dependent Claim
29 words
A method as in claim 1 wherein the effectiveness of the sound attenuating function of said ear cover is read-out directly in decibels on a sound level measuring means.
Claim 4
Dependent Claim
22 words
A method as in claim 1 wherein said output level is measured by means responsive to select frequencies of the noise spectrum.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |