Teac Corporation

Shinji Umehara

Hiroshi Tsuyuguchi

Takayuki Honda

Ryotaro Hongo

Mitsuru Hasegawa

Teruyoshi Nakahashi

Yoshinobu Yanagibashi

Kohji Nagai

Yukinobu Nakamura

A DVD recorder system having a sleep state. When a predetermined period of a non-operation state has elapsed, a key controller switches the state of a power source circuit to interrupt voltage supply, thereby causing the system to shift to the sleep state. In this state, when a signal is input from the video input terminal, the key controller controls the power source circuit to turn ON, thereby causing the system to shift to the normal state. After recovery to the normal state, a DVD processor provides instructions to a DVD drive in accordance with recording conditions which are prestored in an EEPROM, and supplies an input video signal to the DVD drive so as to start recording. Also, when a medium is inserted in the DVD drive, the key controller detects an insertion signal to control the power source circuit to turn ON, thereby causing the system to return to the normal state.

Data recording/reproducing system using optical disk apparatus

A bidirectional, multitrack magnetic tape subsystem is disclosed which is for use with a two-reel, belt-driven tape cartridge in which the tape tension increases linearly with tape travel in either direction. Upon completion of writing or reading data along one track, the tape is stopped at one extremity thereof and then reversed toward the other extremity, with the head unit held on said one track. Only after the tape has been reversed a predetermined short distance is the head unit shifted from said one to another track, preferably with the tape held at a standstill during such shifting. Thus the head unit travels between the bidirectional tracks on the tape when the tape tension is substantially at a minimum, thereby avoiding possible damage to the tape.

Method and apparatus for moving head from one tape track to another

A compatible apparatus capable of reproducing digital data from magnetic tape cassettes employing two different recording schemes such as, typically, NRZI and write equalization. A series of common reproduce circuit elements (e.g. an attenuator, automatic grain control, low pass filter, and shaping circuit) are connected to a magnetic transducer via a preamplifier for use in processing the transducer output signal representative of both NRZI and write equalized data recovered from both types of tape cassettes. Serially inserted in the series connection of the common reproduce circuit elements is a parallel connection of a first exclusive reproduce circuit element (e.g. a differentiating amplifier) used exclusively for reproduction of the NRZI data, and a second exclusive reproduce circuit element (e.g. a flat amplifier) used exclusively for reproduction of the write equalized data. As each loaded tape cassette is automatically identified as being of the NRZI or write equalization type, the required one of the first and second exclusive reproduce circuit elements is switched into serial connection with the common reproduce circuit elements. Most of the reproduce circuit elements can thus be used in common for the processing of both NRZI and write equalized data.

Apparatus capable of data reproduction from digital tape cassettes or

Growing community of inventors

Kodaira, Japan

Shinji Umehara