High speed optical information system and method

Abstract

A high speed optical information search system, comprising a scanning device means for scanning along the vertical lines on the optical magnetic tape, a pick-up device for sensing and accumulating data of the tape and for shift-transmitting and outputting the accumulated data in accordance with a shift clock, a memory circuit for writing and reading digital data information outputted from the pick-up device, a clock for generating clock signals corresponding to a transmission bit speed and to a speed of 5 times of a data transmission bit speed, a reading address counter for counting in accordance with a clock signal corresponding to the data transmission bit speed outputted from the clock during high and normal speed regeneration, a writing address counter for counting according to a clock signal corresponding to predetermined times of the transmission bit speed outputted from the clock during the high speed search, a writing address control circuit for controlling the output signals from the pick-up device to be written in the memory circuit in accordance with the address counted by the writing address counter during a predetermined time span of the frame period under the high speed search mode, a demodulating circuit for demodulating digital signals of the memory circuit to analogue video signals, and a writing/reading control circuit for detecting odd and even fields from the synchronizing signals loaded on composite video signals outputted from the demodulating circuit and for outputting control signals to control the writing/reading to and from the memory circuit.