Servo system

Details Servo system Servo system

1985-05-17

1987-03-03

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

369 50, 360 73, G05B 1929

Patent

active

046478280

ABSTRACT:
A servo system for controlling a motor rotation to rotate a disc having thereon information modulated in run length limited code is disclosed, which includes a circuit for counting the number of pulses of the maximum transition interval in the information reproduced from the disc, a loop for controlling the motor rotation at a constant linear velocity in response to the output of the counting circuit, a phase comparator for digitally phase-comparing a phase information signal of the signals reproduced from the disc with a reference signal having a frequency N times that of the phase information signal at every N times and a loop for controlling the phase of the motor through the output of the phase comparator.

REFERENCES:
patent: 3978285 (1976-08-01), Tan et al.
patent: 4275466 (1981-06-01), Yamamoto
patent: 4338683 (1982-07-01), Furukawa et al.
patent: 4386300 (1983-05-01), Ogawa
patent: 4392162 (1983-07-01), Yamamoto
patent: 4397011 (1983-08-01), Ogawa
patent: 4418406 (1983-11-01), Ogawa
LM567/LM567C Tone Decoder Linear Databook, National Semiconductor Co.
Tone-Alert Decoder the Encyclopedia of Electronic Circuits Rudolf F. Graf, p. 213.

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