Ricoh Company, Ltd.

Tetsuroh Tatebe

Toshiaki Tokita

Tomohiko Kamatani

Hidetaka Noguchi

Koji Kawahata

A signal level adjustment apparatus includes a detector configured to detect both a plurality of peak levels of an input signal having a sinusoidal waveform or a substantially sinusoidal waveform and a plurality of bottom levels of the input signal; and a level adjuster configured to adjust, in a predetermined zone of the input signal, levels of the input signal based on the plurality of peak levels and the plurality of bottom levels detected by the detector.

Signal level, adjustment apparatus, phase detection apparatus, motor drive controller, conveyer, image forming apparatus, and signal level adjustment method

A voltage level detecting device is provided including comparators, a detection circuit, a trigger signal output circuit, a delayed control signal output circuit, a delayed comparison result signal output circuit, a circuit, and a control circuit. The comparators compare a voltage level of an input signal with each threshold level to generate and output a comparison result signal. The detection circuit detects a change in the comparison result signal and outputs a detection signal. The trigger signal output circuit outputs a trigger signal when a predetermined time has elapsed. The delayed control signal output circuit outputs a delayed control signal indicating a value of the control signal. The delayed comparison result signal output circuit outputs a delayed comparison result signal indicating the value of the comparison result signal. The circuit outputs a voltage level signal indicating a voltage level of the input signal. The control circuit outputs the control signal.

Voltage level detecting device, motor driving apparatus, motor driving system, and method for detecting voltage level

A signal amplifier for a phase detector, based on plural sensor signals having amplitude levels in accordance with a rotational position of a rotor of a motor to detect the rotational position thereof includes a first phase detector; a phase counter; a signal amplification factor operation circuit; a signal amplification factor controller; and a signal amplification unit.

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Hyogo, Japan

Tetsuroh Tatebe