Pioneer Corporation

Pioneer Dj Corporation

Ichiro Sugai

Kiyoshi Tateishi

Kazuo Takahashi

Mitsuru Sato

Akira Hattori

Takashi Matsumoto

The disclosed apparatus extracts particular instrument sounds included in music in real time during music reproduction. The audio processing sectionhas an attack decision sectionthat decides attack positions of the bass drum sounds in audio signals, a bass drum sounds decision sectionthat decides sound periods of the bass drum in the audio signals, and a bass drum sounds extraction sectionthat extracts bass drum sounds using a time varying type filter for the attack positions and an adaptive type filter for the sound periods.

Audio processing apparatus, reproduction apparatus, audio processing method and program

A tempo detecting deviceincludes an envelope detecting meansthat detects an envelope of musical composition data, a frequency-component detecting meansthat performs a discrete Fast Fourier Transform processing on the detected envelope to thereby detect a frequency spectrum, and a tempo detecting meansthat detects, based on a characteristic of the detected frequency spectrum, a tempo of the musical composition data.

Tempo detecting device and tempo detecting program

An optical pickup is provided for preventing an objective lens from colliding with an optical recording medium at the stage of initial adjustments. The optical pickup device comprises a servo circuit, and a lens driver for driving an objective lens. In the servo circuit, a drive signal generator supplies the lens driver with one of a first focus drive signal for moving the objective lens in a direction closer to an information recording layer, and a second focus drive signal for moving the objective lens in a direction away from the information recording layer. A controller in a timing generator switches a signal supplied to the lens driver from the first focus drive signal to the second focus drive signal when the level changes by a predetermined range or more in a servo signal which is generated during a period in which the first focus drive signal is being supplied to the lens driver.

Optical pickup device and apparatus for reading data from optical storage medium

An apparatus including a first engaging portion for holding an optical pickup, a second engaging portion to be engaged with the first engaging portion, a transfer portion for driving the second engaging portion to transfer the first engaging portion in a radial direction, a calculating portion for calculating a backlash value between the first and second engaging portions in a transfer direction of the first engaging portion, and a driving control unit. The driving control unit controls a driving portion to transfer the optical pickup based on a calculated backlash value.

Optical pickup transfer apparatus

An optical disc player having an optical pickup records and retrieves information on an optical disc while the optical disc is rotating. A rotation pulse is generated each time the optical disc rotates through a prescribed angle. A rotation frequency data representing a frequency of the rotation pulse is also generated. A servo processor performs servo processing for rotation control on the optical disc in accordance with the rotation frequency data. A sampling pulse generator performs computational processing on an input data signal to generate a sampling pulse. The sampling pulse generator also corrects the rotation frequency data based on a phase error between the sampling pulse and the rotation pulse to use a corrected rotation frequency data as the input data signal. Another servo processor performs servo processing for repetitive control on the optical pickup using the sampling pulse.

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Tokorozawa, Japan

Ichiro Sugai