(57) A waveform displaying device, in which a measured analogue signal is converted into
a digital signal by means of an analogue to digital converter and thereafter the digital
signal is directly inputted in a display device (19) such as a raster scanning display,
a liquid crystal display device, effecting the display while controlling the brightness
of pixels so as to reproduce to display waveform of the measured analogue signal.
In the present device the brightness of pixels is varied, depending on slew rate of
the waveform, so that the brightness of interpolation lines is increased, when differences
between inputted waveform data are small, and the brightness is decreased, when the
differences are small. Further places, where the density of waveforms is high, are
displayed brightly by accumulating the brightness thereof. In this way, since peculiar
points in the waveforms such as points, at which the phase, the frequency or the amplitude
is varied, are displayed as points, at which the brightness is varied, it is possible
to find easily these points and further observation is easy, also in the case where
a number of waveforms are displayed, superposed on each other.
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