US4233564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for changing the scale of a logarithmic signal
Assignee: BAE Systems Aerospace Inc
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Filing: 1978-09-05
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Granted: 1980-11-11
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Expires: 1998-09-05
Abstract
Abstract With the apparatus described, the logarithmic slope of a signal may be changed so that a relatively flat signal has its scale expanded to make full use of the available voltage range. To do so the supplied logarithmic signal is clamped to a selected voltage level and then linearly amplified to develop an output signal having a logarithmic scale different from that of the supplied signal.
Inventors
- 👤 Sheldon J. Kerbel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:34
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
Apparatus for modifying the scale of a supplied logarithmic signal having a reference level, comprising: means for generating a clamping signal having a selected voltage level; a clamping circuit for clamping the level of said logarithmic signal to the level of said clamping signal; and means for linearly modifying the amplitude of said clamped logarithmic signal thereby to generate an output logarithmic signal having a different logarithmic scale than said supplied logarithmic signal.
Claim 2
Dependent Claim
73 words
Apparatus for modifying the scale of a supplied logarithmic signal having a reference level, comprising: means for generating a clamping signal having a selected voltage level; a clamping circuit for clamping the level of said logarithmic signal to the level of said clamping signal; and means for linearly modifying the amplitude of said clamped logarithmic signal thereby to generate an output logarithmic signal having a different logarithmic scale than said supplied logarithmic signal.
Claim 3
Dependent Claim
18 words
Apparatus as specified in claim 1 wherein said means for linearly modifying signal amplitude comprises a linear amplifier.
Claim 4
Dependent Claim
18 words
Apparatus as specified in claim 1 wherein said means for linearly modifying signal amplitude comprises a voltage divider.
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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |