Hitachi, Ltd.

Izumi Kimura

Toshifumi Takeuchi

Hiroshi Tadokoro

Munehiro Nishioka

Yutaka Nagai

Takao Arai

Osamu Kawamae

Shinichi Obata

A disk reproducing apparatus is provided which can cope with the intermittent access due to track jump in the conventional CD reproducing system and which can reproduce data at N times the normal speed and produce the reproduced data at the normal speed. The disk reproducing apparatus includes a memory for storing the data and time information reproduced from the disk to match with each other, another external memory, a detection circuit detecting the time difference between the finally produced output data and the data which is being accessed, and a control circuit detecting the overflow/underflow of the external memory and controlling it to be written. The construction can absorb the time difference between the system operation speed and data output speed even during an intermittent access so that continuous data can be produced.

Disk reproducing apparatus controlling read signal from a disk by using demodulated identifying signal and stored identifying signal in a memory

Disk reproducing apparatus controlling read signal from a disk by using

Disk reproducing apparatus

Disk reproducing apparatus and method for reproducing an audio signal

In a reproducing apparatus for an optical disc recorded at a constant linear velocity (CLV), so as to increase the reproducing access speed, a first clock generator for generating a reproducing clock corresponding to the transmission rate of a digital information signal, an oscillator for oscillating at a fixed frequency, a second clock generator for generating a master clock which is a reference of operations of a first controller for controlling the linear velocity, a digital signal processor, and a second controller for controlling the storage from the clock generated by the oscillator, a third clock generator for generating a master clock which is a reference of operations of the digital signal processor and the second controller without using the oscillator, and a switch for switching the master clock which is a reference of operations of the digital signal processor and the second controller to one of the clock by the second clock generator and the clock by the third clock generator are provided.

Disc reproducing apparatus

A digital signal reproduction device including a data strobe circuit high in margin against noise and rapid in recovery from dropout of data and a digital signal reproduction method performed in such device. The digital signal reproduction device includes a pair of data strobe circuits and a switching circuit for selecting one of the outputs of the pair of data strobe circuits, and a circuit for generating from the received signal a signal to control the switching circuit. The data strobe circuits ensure high reliability of the received signal against noise and a short time from dropout of the received signal to acquisition of a reproduction clock. The data strobe circuit is selectable which is suitable for the reproduction state of the reproduced signal.

Digital signal reproduction devices, integrated circuits for use

A digital signal recording method and apparatus for recording first digital data and second digital data on a writable disc without an interleave discrepancy therebetween. The first digital data is previously recorded and the second digital data is at least one of overlapped and joined with the first digital data on a writable disc so that no interleave discrepancy occurs.

Digital signal overlapped or joined recording method and apparatus

Growing community of inventors

Yokohama, Japan

Izumi Kimura