Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1997-05-09
1999-03-02
Snow, Walter E.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324160, 360 7302, 369239, G01P 342, G01P 348, G01P 354
Patent
active
058776230
ABSTRACT:
A method is disclosed for measuring the linear velocity of recording of data recorded a CD using a Hall sensor. A Hall sensor is placed in the spindle motor of a CD drive to produce a signal based on alternating magnetic flux in the spindle motor. An amplified and processed version of the signal output from the Hall sensor during operation of the CD drive is monitored to measure the timing of three successive inversions of the signal. Based on this timing measurement, the rotational speed of the spindle motor is determined. The recording linear velocity of the data recorded on the CD presently mounted in the CD drive is obtained based on the rotational speed determined from the Hall signal and on a reference rotational speed. As a result of using this method for obtaining the recording linear velocity of the data recorded on the CD, no errors are generated based on the number of tracks the pickup is moved across, and the time necessary for measuring the recording linear velocity is reduced.
REFERENCES:
patent: 4388713 (1983-06-01), Tatsuguchi
Samsung Electronics Co,. Ltd.
Snow Walter E.
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