Patent US4236118A successfully refreshed from Google Patents.
US4236118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized remote sensing high fidelity apparatus
Assignee: Individual
•
Filing: 1978-12-18
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Granted: 1980-11-25
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Expires: 1998-12-18
Abstract
Abstract In a high-fidelity sound reproducing system wherein the speaker is located remotely from the amplifier and therefore the electrical signals reaching the speaker are subject to distortion from the capacitive and inductive reactance of the conductors joining the amplifier to the speaker, and further subject to pickup of hum and other forms of interference, the distortion of the signal is substantially eliminated by the use of a negative feedback network connected between the input terminal of the load and the input terminal of the amplifier and by a positive feedback network connected between the input terminal of the amplifier and the return terminal of the load, the feedback loops operating on the amplifier to alter its output in such a way that the signal applied at the terminals of the remote speaker more nearly resembles the signal applied as an output to the amplifier.
Inventors
- 👤 Wheeler M. Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:57
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/002; H03; H03F; H03F3/00; H03F3/181; H03F3/183; H03F3/187
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
138 words
An improved amplifier system for driving a remotely located load wherein it is desired that the amplified signal applied to the load be a high-fidelity reproduction of an input signal, said system comprising: a load remotely located from the amplifier system and having an input terminal and a return terminal; an amplifier having an input terminal, and having an output terminal connected to the input terminal of the load, and having a return terminal connected to the return terminal of the load; a negative feedback network connected between the input terminal of the load and the input terminal of the amplifier, and applying to the input terminal of the amplifier a negative feedback signal related to the difference between the signal present at the input terminal of the load and a high fidelity reproduction of the input signal.
Claim 2
Dependent Claim
138 words
An improved amplifier system for driving a remotely located load wherein it is desired that the amplified signal applied to the load be a high-fidelity reproduction of an input signal, said system comprising: a load remotely located from the amplifier system and having an input terminal and a return terminal; an amplifier having an input terminal, and having an output terminal connected to the input terminal of the load, and having a return terminal connected to the return terminal of the load; a negative feedback network connected between the input terminal of the load and the input terminal of the amplifier, and applying to the input terminal of the amplifier a negative feedback signal related to the difference between the signal present at the input terminal of the load and a high fidelity reproduction of the input signal.
Claim 3
Dependent Claim
15 words
The system of claim 1 wherein said negative feedback network is located adjacent said amplifier.
Claim 4
Dependent Claim
25 words
The system of claim 1 further comprising means for altering said negative feedback network to control the amount of negative feedback applied to said amplifier.
Claim 5
Dependent Claim
138 words
An improved amplifier system for driving a remotely located load wherein it is desired that the amplified signal applied to the load be a high-fidelity reproduction of an input signal said system comprising: a load remotely located from the amplifier system and having an input terminal and a return terminal; an amplifier having an input terminal, and having an output terminal connected to the input terminal of the load, and having a return terminal connected to the return terminal of the load; a positive feedback network connected between the input terminal of the amplifier and the return terminal of the load, and applying to the input terminal of the amplifier a positive feedback signal related to the difference between the signal present at the input terminal of the load and a high fidelity reproduction of the input signal.
Claim 6
Dependent Claim
138 words
An improved amplifier system for driving a remotely located load wherein it is desired that the amplified signal applied to the load be a high-fidelity reproduction of an input signal said system comprising: a load remotely located from the amplifier system and having an input terminal and a return terminal; an amplifier having an input terminal, and having an output terminal connected to the input terminal of the load, and having a return terminal connected to the return terminal of the load; a positive feedback network connected between the input terminal of the amplifier and the return terminal of the load, and applying to the input terminal of the amplifier a positive feedback signal related to the difference between the signal present at the input terminal of the load and a high fidelity reproduction of the input signal.
Claim 7
Dependent Claim
15 words
The system of claim 4 wherein said positive feedback network is located adjacent said amplifier.
Claim 8
Dependent Claim
25 words
The system of claim 4 further comprising means for altering said positive feedback network to control the amount of positive feedback applied to said amplifier.
Claim 9
Dependent Claim
195 words
An improved amplifier system for driving a remotely located load wherein it is desired that the amplified signal applied to the load be a high-fidelity reproduction of an input signal, said system comprising: a load remotely located from the amplifier system and having an input terminal and a return terminal; an amplifier having an input terminal, and having an output terminal connected to the input terminal of the load, and having a return terminal connected to the return terminal of the load; a negative feedback network connected between the input terminal of the load and the input terminal of the amplifier and applying to the input terminal of the amplifier a negative feedback signal related to the difference between the signal present at the input terminal of the load and a high fidelity reproduction of the input signal; and a positive feedback network connected between the input terminal of the amplifier and the return terminal of the load, and applying to the input terminal of the amplifier a positive feedback signal related to the difference between the signal present at the input terminal of the load and a high fidelity reproduction of the input signal.
Claim 10
Dependent Claim
195 words
An improved amplifier system for driving a remotely located load wherein it is desired that the amplified signal applied to the load be a high-fidelity reproduction of an input signal, said system comprising: a load remotely located from the amplifier system and having an input terminal and a return terminal; an amplifier having an input terminal, and having an output terminal connected to the input terminal of the load, and having a return terminal connected to the return terminal of the load; a negative feedback network connected between the input terminal of the load and the input terminal of the amplifier and applying to the input terminal of the amplifier a negative feedback signal related to the difference between the signal present at the input terminal of the load and a high fidelity reproduction of the input signal; and a positive feedback network connected between the input terminal of the amplifier and the return terminal of the load, and applying to the input terminal of the amplifier a positive feedback signal related to the difference between the signal present at the input terminal of the load and a high fidelity reproduction of the input signal.
Claim 11
Dependent Claim
20 words
The system of claim 7 wherein said negative feedback network and said positive feedback network are located adjacent said amplifier.
Claim 12
Dependent Claim
46 words
The system of claim 7 further comprising means for altering said negative feedback network to control the amount of negative feedback applied to said amplifier, and further comprising means for altering said positive feedback network to control the amount of positive feedback applied to said amplifier.
Claim 13
Dependent Claim
115 words
In a system of the type in which a power amplifier is connected by a lead and a return conductor to a distant load and in which it is desired that the signal applied by the lead to the distant load be a high-fidelity reproduction of an input signal applied to the power amplifier, the improvement comprising: a negative feedback network connected between the input of the power amplifier and the point at which the lead is connected to the distant load, and applying to the input of the power amplifier feedback signals related to the difference between the signal applied by the lead to the load and a high-fidelity reproduction of the input signal.
Claim 14
Dependent Claim
115 words
In a system of the type in which a power amplifier is connected by a lead and a return conductor to a distant load and in which it is desired that the signal applied by the lead to the distant load be a high-fidelity reproduction of an input signal applied to the power amplifier, the improvement comprising: a negative feedback network connected between the input of the power amplifier and the point at which the lead is connected to the distant load, and applying to the input of the power amplifier feedback signals related to the difference between the signal applied by the lead to the load and a high-fidelity reproduction of the input signal.
Claim 15
Dependent Claim
115 words
In a system of the type in which a power amplifier is connected by a lead and a return conductor to a distant load and in which it is desired that the signal applied by the lead to the distant load be a high-fidelity reproduction of an input signal applied to the power amplifier, the improvement comprising: a positive feedback network connected between the input of the power amplifier and the point at which the return conductor is connected to the distant load, and applying to the input of the power amplifier feedback signals related to the signal at the point where the return conductor is connected to the load and to the input signal.
Claim 16
Dependent Claim
115 words
In a system of the type in which a power amplifier is connected by a lead and a return conductor to a distant load and in which it is desired that the signal applied by the lead to the distant load be a high-fidelity reproduction of an input signal applied to the power amplifier, the improvement comprising: a positive feedback network connected between the input of the power amplifier and the point at which the return conductor is connected to the distant load, and applying to the input of the power amplifier feedback signals related to the signal at the point where the return conductor is connected to the load and to the input signal.
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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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |