Patent US3692959A successfully refreshed from Google Patents.
US3692959A
Expired / Lapsed
US
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Digital hearing aid gain analyzer
Assignee: Electone Inc
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Filing: 1970-10-28
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Granted: 1972-09-19
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Expires: 1990-10-28
Abstract
Abstract A digital display hearing aid gain analyzer is provided for measuring the gain of hearing aids over a predetermined frequency range. A sine wave oscillator generates a predetermined sine wave frequency in an anechoic chamber. The hearing aid to be tested is then connected in the chamber to a microphone pickup housed in a 2 cubic centimeter coupler and picks up and amplifies the sine wave signal in the chamber which is then converted from a linear sine wave signal to a logarithmic signal to a digital type signal indicative of the gain of the hearing aid which is then displayed on Nixie tubes.
Inventors
- 👤 Paul F Lamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:48
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
A gain analyzer apparatus for measuring the gain of audio amplifying devices comprising in combination: a. chamber means; b. signal generating means for generating predetermined audio frequencies; c. transducer means coupled to said signal generating means and located in said chamber means for producing said audio frequencies in said chamber means; d. microphone means located in said chamber means and having means for acoustically coupling the output of an audio amplifying device thereto, whereby said audio amplifying device is adapted to amplifying said audio frequencies in said chamber means and apply said amplified audio frequencies to said micropHone means; e. analog to digital conversion means coupled to said microphone means for generating digital signals from the output from said microphone means, said digital signals being indicative of the gain of the amplifying device being analyzed; and f. counting means coupled to said analog to digital conversion means for counting digital signals received from said analog to digital conversion means.
Claim 2
Dependent Claim
159 words
A gain analyzer apparatus for measuring the gain of audio amplifying devices comprising in combination: a. chamber means; b. signal generating means for generating predetermined audio frequencies; c. transducer means coupled to said signal generating means and located in said chamber means for producing said audio frequencies in said chamber means; d. microphone means located in said chamber means and having means for acoustically coupling the output of an audio amplifying device thereto, whereby said audio amplifying device is adapted to amplifying said audio frequencies in said chamber means and apply said amplified audio frequencies to said micropHone means; e. analog to digital conversion means coupled to said microphone means for generating digital signals from the output from said microphone means, said digital signals being indicative of the gain of the amplifying device being analyzed; and f. counting means coupled to said analog to digital conversion means for counting digital signals received from said analog to digital conversion means.
Claim 3
Dependent Claim
15 words
The apparatus according to claim 1 in which said chamber means is an anechoic chamber.
Claim 4
Dependent Claim
33 words
The apparatus according to claim 1 in which said counting means includes Nixie display tubes for displaying the counted digital signals as the gain of said amplifying device at a predetermined input frequency.
Claim 5
Dependent Claim
14 words
The apparatus according to claim 3 in which said transducer means is a speaker.
Claim 6
Dependent Claim
28 words
The apparatus according to claim 4 in which said microphone means includes a microphone in a 2 cubic centimeter coupler for coupling the amplifying device to said microphone.
Claim 7
Dependent Claim
21 words
The apparatus according to claim 5, in which said microphone is located in a coupler having a simulated human ear cavity.
Claim 8
Dependent Claim
17 words
The apparatus according to claim 6 in which said signal generating means is a sine wave oscillator.
Claim 9
Dependent Claim
38 words
The apparatus according to claim 7 in which said amplifying devices are hearing aids having microphones amplifiers and receivers with said receivers coupled to said microphone means for transmitting sound picked up and amplified by said hearing rectifying
Claim 10
Dependent Claim
55 words
The apparatus according to claim 1 in which said analog to digital conversion means includes a rectifying means for rectifying said signals from said microphone means and a logarithmic amplifier for converting linear signals from said rectifying means to logarithmic signals whereby the output of said analog to digital conversion means will be in decibels.
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |