Frequency measuring apparatus and frequency measuring method
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United States of America Patent
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Feb 17, 1998
Grant Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Oct 22, 1993
priority date (Note) -
Expired
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Abstract
A frequency measuring apparatus for measuring the frequency of an input signal to be measured with high accuracy. The apparatus includes a crystal oscillator for generating an internal reference frequency, a temperature sensor provided on the crystal oscillator, a writable memory and an estimation control device for storing in the memory a correspondence relationship between an absolute frequency to be taken as a reference at a predetermined temperature measured by the temperature sensor and the internal reference frequency as error correction information and estimating the frequency ortho input signal in conformity with the internal reference frequency corrected by the error correction information upon the input signal.
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