Harushige Nakagaki

A Study On The Method on Double The Data Rate For Recording/reproducing And Search Speed For DAT

A method to double the search speed and the data transmission rate for recording/reproducing has been studied for a DAT (digital audio tape recorder). A high speed search up to 400 times the normal playback speed was realized. Using this DAT, the search time for programs from the beginning to the end of a 2-hour long tape was reduced to 26 sec from 44 sec, the latter value being that for a conventional DAT. With this technology, a high-speed search system has been developed for a DAT using magnetic tape as the recording medium. >

A high-functional compact and light weight mechanism for R-DAT

Digital audio tape (DAT) drive mechanisms are discussed with emphasis on the mechanical problems involved in high-precision positioning of the tape with respect to the recording head. Positioning systems used for compact disk players and a DAT drive system developed by the authors are compared. The various forces applied or induced on the recording media are considered. >

Automatic Loop Gain Control System Of Compact Disk (CD) Player's Tracking Servo

We developed the Automatic Loop gain Control System of CD Players tracking servo. It measures Frame error numbers with changing the loop gain in playback, and enlarges the loop gain by a fixed value from the loop gain when the error numbers increase suddenly. Consequently, we were able to decrease the lens actuator noise and to adjust the deviation of track loop gain by disc characteristics.