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Inventor:
Yamawaki; Chiaki
Address:
Habikino, JP
No. of patents:
7
Patents:












Patent Number Title Of Patent Date Issued
6049182 Motor speed control device April 11, 2000
A sinusoidal wave data stream for correcting a torque ripple of a motor is stored in a torque ripple corrective memory. As the motor rotates, rotational angle information is computed from a rotational pulse signal and a rotor magnetic pole position pulse signal, which are generated a
6031966 Motor speed control device February 29, 2000
The motor speed control device of the present invention is provided with an FG sensor and a waveform shaping circuit for obtaining N pulse signals (N.gtoreq.1 where N is an integer) in one rotation of a motor so as to control the rotation speed of the motor in accordance with period
5920163 Phase detecting circuit of brushless motor and magnetic recording and reproducing apparatus usin July 6, 1999
A differential amplifier amplifies a PG reproduction signal to a level permitting signal processing. A low-pass filter makes the signal waveform of a PG detection signal generated by the differential amplifier substantially uniform irrespectively of the rotational speed of a rotating
5834761 Image input apparatus having a spatial filter controller November 10, 1998
The Invention is an image input apparatus equipped with means of image shifting which is capable of inputting images of different resolutions, and enables the transmission band of the spatial filter to be switched in accordance with resolution in order to prevent moire. When a flat t
5668746 Reproduced waveform equalization circuit September 16, 1997
Low-frequency components of a reproduced modulated signal is attenuated by an analog high-pass filter. The modulated signal with its low-frequency components attenuated is converted into a digital signal by means of an A/D converter. Then, the digital signal is directly introduced to a f
5517369 Multi-track magnetic signal reproducing apparatus May 14, 1996
In a multi-track magnetic signal reproducing apparatus, a plurality of MR heads including MR (Magneto Resistance Effect) elements are provided correspondingly to tracks on a magnetic tape. At the time of reproduction, constant current from a constant current power supply is sequentially
5355392 Digital data detector for reducing errors due to frequency variations October 11, 1994
A digital receive signal is sampled by an A/D converter, and the position of a point at which the receive signal crosses a reference level is obtained in response to sampling data by an exclusive OR gate. A phase interval between the present sampling point and the point at which the










 
 
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