Sampling method and circuit
AssigneeNihon Kohden Corporation
InventorHajime Harada
Life of this patent
Estimating the term…
Abstract
A method and circuit for sampling input waveform signals at a predetermined periodic rate by detecting a peak and a bottom value during each period. The method further includes holding a peak value and a bottom value of an input waveform signal whenever they are generated as hold values and resetting the hold value to the current input waveform signal level so as to obtain a high-fidelity sampling output. The peak level or the bottom level is generated as a sampling value according to which is operating, the peak hold or bottom hold, at the sampling time. If both are currently not operating, then outputting the hold which was the last in operation.
Claims4
A method of sampling input waveform signals during a predetermined sampling period by detecting a peak and a bottom in each period, the improvement comprising:
- generating as hold values a peak level and a bottom level of an input waveform signal;
- holding one of the peak level and bottom level as hold values by resetting one of a peak hold means and a bottom hold means to the level of said input waveform signal at a time of generating the hold values;
- determining whether the peak hold means or the bottom hold means is resetting at a time of sampling or at a time prior to sampling;
- and
- generating a bottom level as a sampling value when the peak hold means is resetting at a time of sampling and generating a peak level as a sampling value when the bottom hold means is resetting at the time of sampling.
A circuit for sampling input waveform signals during a predetermined sampling period by detecting a peak and a bottom in each period, the improvement comprising:
- peak hold means for holding a peak level of an input waveform signal by resetting the peak hold means to a level of the input waveform signal, said peak hold means generating an actuating signal;
- bottom hold means for holding a bottom level of an input waveform signal by resetting the bottom hold means to a level of the input waveform signal, said bottom hold means generating an actuating signal;
- a flip-flop means triggered by an actuating signal from one of said peak hold means and bottom hold means, the actuating signal indicating whether said peak hold means or said bottom hold means is operating;
- a signal selection means for generating said bottom level as a sampling value when the flip-flop means is triggered by the peak hold means actuating signal, said signal selection means generating said peak level as said sampling value when the flip-flop means is triggered by the bottom hold means actuating signal.
Dependencies are inferred from the claim text.