Inventor

YOKOGAWA FUMIHIKO

JP53 patents

⚠️ This page may combine multiple inventors who share the name “YOKOGAWA FUMIHIKO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

YOKOGAWA FUMIHIKO

PIONEER ELECTRONIC CORP

Multi-layered recording disk and recording/reproducing system using the same

Constant angular velocity type optical disk, double density recording method therefor, and reproducing method for such recorded optical disk

Clock generator circuit and a synchronizing signal detection method in a sampled format system and a phase comparator circuit suited for generation of the clock

Optical disk, tracking error signal generating apparatus, and tracking control apparatus

Digital signal reproducing apparatus for reproducing digital signals from a recording medium

Disc playing and recording apparatus having a pair of heads controlled to prevent interruptions during play

Optical recording apparatus

Method and apparatus for data recording and reproducing with error reduction

Optical information recording apparatus

Phase-locked loop circuit

Clock generator circuit and a synchronizing signal detection method in a sampled format system and a phase comparator circuit suited for generation of the clock

Clock signal generating circuit for a data storing and reproducing system

Method and apparatus for identifying the type of servo system to be used with a given disc

Clock pulse generating circuit

Amplitude modulated high frequency signal detection device

Automatic loading disc player

Digital modulation signal reading device

Spindle servo circuit in an apparatus for playing an optical disk having synchronous marks and data marks satisfying certain criteria

Optical disk having synchronous marks and data marks to satisfy certain criteria

Optical disc with heat blocking bands between tracks

Optical disk of sampled servo type having synchronization a marks for simple synchronization detection

Tracking apparatus for sampled servo system which performs tracking control using signals identifying tracks as even or odd numbered

Apparatus for playing optical recording medium with combination tracks and plural beams tracking servo

Optical recording medium and apparatus for playing such a medium

Optical recording medium

Duty factor control circuit with variable output pulse width function

Apparatus for generating a tracking error signal

AC amplifying RF signal processing circuit for optical disk player

Optical data recording and reproducing system with control of high frequency superposed signal applied to semiconductor laser

Electronic impedance device for providing a variable impedance

Automatic loading disc player

Servo circuit for generating a tracking error signal for optical disk player

Automatic loading disc player

Audio signal compression and expansion system

Non-linear reflectance optical information recording layer irradiated by a light beam controlled with an amplitude filter

Optical disc and system for generating a tracking error signal for the optical disc

Tracking servo apparatus for use in an optical disk player

Optical disk, tracking error signal generating apparatus, and tracking control apparatus

Spindle control device in optical disk recording/reproducing apparatus

Spindle servo utilizing a vertical sync mark

Duty factor control circuit with variable output pulse width function

Optical disc with pregrooves and recording method and apparatus using an optical disc of that type

Actuator drive circuit

Digital data transmitting method

PIONEER CORP

Video disc having an aspect ratio information and video disc player having an aspect ratio converting function

High density optical recording medium and method for reproducing thereof

TOSHIBA KK

Digital data transmitting method

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD

Digital modulation apparatus, a digital modulation method, and a recording medium therefor

PIONEER ELECTRIC CORP

Spindle control device in optical disk recording/reproducing apparatus

HITACHI LTD

Electronic impedance circuit including a compensation arrangement for d.c. offset