Pioneer Electronic Corporation

Tsuneyoshi Nagashita

Toshiyuki Kimura

Yoshio Aoyagi

Hiroyuki Abe

Takayuki Iijima

Akira Haeno

Akio Namiki

Yoshihiko Watanabe

Kimito Kobayashi

Isao Matsumoto

Kazuto Shimokawa

Isamu Nomura

Susumu Niinuma

Susumi Niinuma

A method of operating a disk player that reproduces information recorded on a disk. Programs on the disk are addressed from a directory in a memory and the programs are sequentially accessed according to the order in the directory. The directory can be filled by inserting random numbers or by scanning through the programs or over the tracks. A table of contents at the beginning of the disk is read if possible. The tracks can be scanned and only tracks having new programs are reproduced. Also a playback position servo operates with a dead-zone in the drive voltage.

Record information reproducing method with content identifiers

A pulse-width modulation drive circuit for a load such as a motor, particularly, a motor used in a compact disc player or the like, in which losses in diodes used to absorb reverse EMF are substantially eliminated. For this purpose, the pulse widths of pulse signals used to on-off control drive current flow through the load are controlled so as to eliminate the diode losses. The circuits of the various embodiments of the invention are designed so as to be easily implemented in integrated circuit form.

Pulse-width modulation drive circuit

Growing community of inventors

Saitama, Japan

Tsuneyoshi Nagashita