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very
weak or badly distorted, see Fig. 14. The output from the hearing
aid
earphone
is picked up by
a second
precision measuring microphone
and after
amplification sent
to the
SIGNAL
INPUT
of
the Tracer which
indicates
the
frequency response
of
the hearing aid on
the screen.
An example of such an
indication is
seen
in
Fig.
15.
25
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