Sharp Kabushiki Kaisha Corporation

Ichirou Konno

Satoshi Murakami

Kouji Mori

A digital VTR using Automatic Track Finding (ATF) of a four frequency pilot signal system, employing a multiple segment recording system for high density recording and wide band recording. In a recording mode, a segment code signal is recorded on each track in response to a frame synchronizing signal. In a reproduction mode, the phase difference between the reproduced segment code signal and the frame synchronizing signal is detected by phase comparing circuit 26. The rotation speed of capstan motor 29 is controlled so that the phase relation of one signal in the reproduction mode becomes the same as that in the recording mode. As a result, it is possible to reproduce a stable video in the VTR using the segment recording system.

Magnetic recording/reproducing apparatus using segment recording system

A plurality of first codeword pairs each including a 15-bit codeword of which CDS is equal to +3 and a 15-bit codeword of which CDS is equal to -1 and a plurality of second code pairs each including a 15-bit codeword of which CDS is equal to +1 and a 15-bit codeword of which CDS is equal to -3 are produced. One of the plurality of first code pairs and one of the plurality of second code pairs are assigned to each 8-bit data word, and one of the first and second code pairs assigned to each 8-bit data word is selected so that the number of continuous identical bits in a 15-bit codeword sequence is not less than 2 and not more than 8. One of two 15-bit codewords included in the selected code pair is selected so that DSV at the last bit of each 15-bit codeword periodically varies.

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Chiba, Japan

Ichirou Konno