Patent US4085299A successfully refreshed from Google Patents.
US4085299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peak amplitude protection system for ribbon loudspeakers
Assignee: Individual
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Filing: 1977-06-24
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Granted: 1978-04-18
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Expires: 1997-06-24
Abstract
Abstract A current limiting capacitor together with a special impedance matching transformer, is inserted between a power amplifier and the input terminals of a ribbon loudspeaker, such transformer having a sharply saturable magnetic core which limits the time integral of the voltage of the audio signal applied to the ribbon of the ribbon loudspeaker to a safe value for providing protection of the ribbon from excessive peak amplitudes.
Inventors
- 👤 Gilbert L. Hobrough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:52
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/02; H02H9/021; H04; H04R; H04R3/00; H04R3/007
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
In combination: a. a ribbon loudspeaker having an input circuit; b. a power amplifier having an output circuit; c. a transformer having an input circuit coupled to the output circuit of said power amplifier and an output circuit coupled to the input circuit of said ribbon loudspeaker and a magnetic core which saturates at a value of the time integral of the voltage applied to said input circuit of said transformer low enough to prevent extraordinary large amplitude fluctuations of the ribbon of said ribbon loudspeaker; and d. a current limiting device for preventing said loudspeaker from drawing substantial power from said power amplifier due to saturation of said magnetic core.
Claim 2
Dependent Claim
111 words
In combination: a. a ribbon loudspeaker having an input circuit; b. a power amplifier having an output circuit; c. a transformer having an input circuit coupled to the output circuit of said power amplifier and an output circuit coupled to the input circuit of said ribbon loudspeaker and a magnetic core which saturates at a value of the time integral of the voltage applied to said input circuit of said transformer low enough to prevent extraordinary large amplitude fluctuations of the ribbon of said ribbon loudspeaker; and d. a current limiting device for preventing said loudspeaker from drawing substantial power from said power amplifier due to saturation of said magnetic core.
Claim 3
Dependent Claim
34 words
The combination as set forth in claim 1 wherein said current limiting device comprises a capacitor for limiting the transmission of signals produced by said power amplifier which could otherwise damage said ribbon loudspeaker.
Claim 4
Dependent Claim
16 words
The combination as set forth in claim 1 wherein said core has a sharp saturation characteristic.
Claim 5
Dependent Claim
16 words
The combination as set forth in claim 2 wherein said core has a sharp saturation characteristic.
Claim 6
Dependent Claim
128 words
In combination: a. a ribbon loudspeaker having an input circuit; b. a power amplifier having an output circuit; c. a transformer having an input circuit coupled to the output circuit of said power amplifier and an output circuit coupled to the input circuit of said loudspeaker and a sharply saturable magnetic core which saturates at a value of the time integral of the voltage applied to said input circuit of said transformer low enough to prevent extraordinary large amplitude fluctuations of the ribbon of said ribbon loudspeaker; and d. a current limiting device coupled between the output circuit of said power amplifier and the input circuit of said transformer for preventing said loudspeaker from drawing substantial power from said power amplifier due to saturation of said magnetic core.
Claim 7
Dependent Claim
128 words
In combination: a. a ribbon loudspeaker having an input circuit; b. a power amplifier having an output circuit; c. a transformer having an input circuit coupled to the output circuit of said power amplifier and an output circuit coupled to the input circuit of said loudspeaker and a sharply saturable magnetic core which saturates at a value of the time integral of the voltage applied to said input circuit of said transformer low enough to prevent extraordinary large amplitude fluctuations of the ribbon of said ribbon loudspeaker; and d. a current limiting device coupled between the output circuit of said power amplifier and the input circuit of said transformer for preventing said loudspeaker from drawing substantial power from said power amplifier due to saturation of said magnetic core.
Claim 8
Dependent Claim
34 words
The combination as set forth in claim 5 wherein said current limiting device comprises a capacitor for limiting the transmission of signals produced by said power amplifier which could otherwise damage said ribbon loudspeaker.
Claim 9
Dependent Claim
81 words
In a sound reproduction system including a ribbon loudspeaker driven by a power amplifier, an improved coupling device coupled therebetween comprising: a. a transformer having a magnetic core which saturates at a value of the time integral of the voltage applied to said transformer low enough to prevent extraordinary large amplitude fluctuations of the ribbon loudspeaker together with a current limiting device for preventing said loudspeaker from drawing substantial power from said power amplifier due to saturation of said magnetic core.
Claim 10
Dependent Claim
81 words
In a sound reproduction system including a ribbon loudspeaker driven by a power amplifier, an improved coupling device coupled therebetween comprising: a. a transformer having a magnetic core which saturates at a value of the time integral of the voltage applied to said transformer low enough to prevent extraordinary large amplitude fluctuations of the ribbon loudspeaker together with a current limiting device for preventing said loudspeaker from drawing substantial power from said power amplifier due to saturation of said magnetic core.
Claim 11
Dependent Claim
35 words
The coupling device as set forth in claim 7 wherein said current limiting device comprises a capacitor for limiting the transmission of signals produced by said power amplifier which could otherwise damage said ribbon loudspeaker.
Claim 12
Dependent Claim
17 words
The coupling device as set forth in claim 7 wherein said core has a sharp saturation characteristic.
Claim 13
Dependent Claim
16 words
The combination as set forth in claim 8 wherein said core has a sharp saturation characteristic.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |