Frequency and amplitude measurement tool for electronic displays

Details Frequency and amplitude measurement tool for electronic displays Frequency and amplitude measurement tool for electronic displays

1995-06-07

1997-05-20

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345157, G09G 536

Patent

active

056316674

ABSTRACT:
A frequency and amplitude measurement tool for electronic displays is provided. The measurement tool automatically draws a measurement scale (24) on an electronic display screen (12) based upon operator inputs from an input device (18). The operator selects a first point (x.sub.0,y.sub.0) by depressing a key (19) on the input device (18), and selects a second point (x.sub.1,y.sub.1) by subsequent movement of the input device (18). The measurement tool draws a measurement scale (24) extending between the first and second points. The measurement scale (24) includes horizontal lines and vertical hash lines (54) that subdivide the horizontal distance between the first and second points so that the frequency calculated is an average frequency over the number of cycles represented by the subdivisions. The horizontal lines allow the operator to make amplitude measurements, and the vertical hash lines (54) allow the operator to align the measurement scale (24) with consecutive peaks or valleys of a waveform so that the average frequency of a portion of the waveform can be calculated.

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