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US 4,233,564 AGranted
Apparatus for changing the scale of a logarithmic signal
AssigneeHazeltine Corporation
InventorSheldon J. Kerbel
Life of this patent
Estimating the term…
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.
Claims3
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.
Dependencies are inferred from the claim text.