Patent ID: 7395175

Claim:
A digital data recording apparatus that records chronological changes in a physical quantity by acquiring a detection signal, which changes in response to the physical quantity, as digital data at respective sampling timings on a time base, which is based on a reference clock signal, and records the digital data in association with a sampling time at which the digital data was acquired, the digital data recording apparatus comprising: a reference clock generating device, which generates the reference clock signal; a dividing device, which divides the reference clock signal to generate the respective sampling timings on the time base; a first counter device, which counts a clock of the reference clock signal that is generated by the reference clock generating device in an interval between an arbitrary reference timing on the time base, and a sampling timing that is generated by the dividing device; a first temperature measuring device, which measures a first detection temperature proximate to the reference clock generating device; a recording device, which stores a count value, which is counted by the first counter device, and the first detection temperature, which is detected by the first temperature measuring device at a time of the count; and a calculating device; wherein the calculating device calculates a normal sampling time based upon the count value and the first detection temperature stored in the recording device, using a first relationship information that expresses a correlation between the first detection temperature and an oscillation frequency of the reference clock signal.