| Patent Number |
Title Of Patent |
Date Issued |
| 5058093 |
Signal level deviation detecting apparatus |
October 15, 1991 |
| A signal level deviation detecting apparatus for detecting an amplitude deviation of an alternating signal is disclosed. This apparatus comprises: at least two waveform shaping circuit shaving different threshold values for converting an input alternating signal into at least two rectang |
| 4876679 |
Digitally controlled positioning system for quickly moving and then finely positioning an object |
October 24, 1989 |
| A positioning system having a velocity feedback loop for positioning an object has two modes--a high speed moving mode and a fine positional resolution moving mode. The system requires a wide range in the high speed moving mode and a high resolution in the fine positional resolution movi |
| 4688202 |
Tracking control system for an information reproducing apparatus |
August 18, 1987 |
| An information reproducing apparatus for tracking control has a high-pass filter and a low-pass filter of closed loops connected in parallel to each other and has a storage quantity control circuit which controls an input signal of the high-pass filter in response to a defect detection s |
