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2G029 Measuring frequencies, analyzing spectra
G01R23/00 -23/20@Z
G01R23/00-23/15@Z AA AA00
MEASURED QUANTITIES 		AA01 AA02 AA03 AA04 AA05 AA06 AA07 AA08 AA09
. Periods . Frequencies . . Fundamental frequencies, center frequencies . Frequency differences, frequency sums, frequency ratios for two input signals . Deviation from a standard value, rate of frequency variation . Detecting frequency fluctuations, abnormalities . Detecting the presence of specific frequencies . . Measuring the frequency with which specific frequencies are generated . Detecting whether frequencies are within a specific frequency range
AB AB00
WHAT IS MEASURED 		AB01 AB02 AB03 AB04 AB05 AB06
. Commercial power sources . Received signals, radio waves . Modulated waves, carrier waves . Frequency sweep signals . Output signals from the equipment being measured . . Output signals from oscillating circuits
AC AC00
CIRCUITS THAT PROCESS MEASURED SIGNALS 		AC01 AC02 AC03 AC04 AC05 AC06 AC07 AC08 AC09 AC10
. Multiplying circuits, frequency multiplying circuits . Frequency dividing circuits, dividing circuits . Mixing circuits, frequency converting circuits . Phase locked loop (i.e., PLL) circuits, substituting oscillating circuits . Delay circuits . Shift registers, RAM . Circuits that synchronize with the clock . Filters, noise elimination circuits . Circuits that make intermittent signals continuous, elongating circuits . Variants characterized by waveform reshaping circuits
AD AD00
MEASURING CIRCUITS 		AD01 AD02 AD03 AD04 AD05 AD06 AD07 AD08 AD09 AD10
. Counters . . Reversible counters, subtracting counters . . Preset counters . . Variants that add, subtract prescribed values . . Variants having multiple counters . Shift registers . Variants using calculating circuits . . Variants that calculate sampling values . . Variants that calculate correlation functions . Variants that sample and hold values corresponding to frequencies
AE AE00
COUNTING CIRCUIT FUNCTIONS 		AE01 AE02 AE03 AE04 AE05 AE06 AE07 AE08 AE09 AE10
. Synchronization of gate pulses, count pulses with input signals . Range switching circuits . . Gate time switching . . Clock pulse frequency switching . . Variants using frequency converting circuits . . Switching the frequency dividing ratio, multiplying ratio of the measured signals . . Variants that switch ranges automatically . Input signals and reference clocks are counted independently and a ratio is found . Automatic switching between period measurement and frequency measurement . Variants that measure differences in time with the reference periods
AE11 AE12 AE13 AE14 AE15 AE16 AE17 AE18 AE19
. Variants where periods are converted to frequencies . . Variants where clock frequencies are changed within the frequency measuring period . . Variants where frequency signals correspond to period count values . . Variants having a memory to replace period-frequency . . Variants having period-frequency replacement calculating circuits . Compensation for one-count errors . . Variants that measure asynchronous error in gate signals and count pulses . . Variants that cause the phases of gate signals, count pulses to fluctuate . Variants that count multiple signals with one counter using time sharing
AF AF00
PROCESSING THE RESULTS OF COUNTING 		AF01 AF02 AF03 AF04 AF05 AF06 AF07 AF08 AF09
. Digital-analog converting circuits . Variants that store in memory circuits . . Variants that calculate memory output . Variants that move the results to shift registers . . Variants that add, subtract the output of multiple shift registers . Code converting circuits, base number converting circuits . Variants that calculate multiple calculated values . Variants having circuits to correct calculated values . Partial enlarging circuits, level shift circuits
AG AG00
DISPLAYING THE RESULTS OF MEASUREMENT 		AG01 AG02 AG03 AG04 AG05 AG06 AG07 AG08 AG09
. Cathode ray tubes, bar graph display tubes . Voltmeters, ammeters, indicating meters . Liquid crystals, fluorescent materials, piezoelectric elements . Recorders . Light-emitting elements, lamps . Digital displays . . Switching of display units . . Combined use of both digital displays and other displays . . Overflow displays
AH AH00
CONTROL, PURPOSE 		AH01 AH02 AH03 AH04 AH05 AH06 AH07 AH08
. Control using computers, CPU's . Calibration, testing of measuring devices . Preventing flicker in digital displays . Preventing counter malfunctions . Temperature compensation . Preventing malfunctions caused by level fluctuations . Shielding, circuit insulation . Variants that detect the presence of input signals and signal levels
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