| 摘要 |
<p>PURPOSE:To obtain high reliability by deciding which head is to be used in the state of a head switching pulse, deciding a pilot component generated from the head switching pulse and deciding the pilot component regardless of the bit error of an ID. CONSTITUTION:On the diagonal of a cylindrical cylinder, 2n (n>=1) pieces of a head are provided and made one set by two pieces and made the heads 2, 3 with the same azimuth. Since signals 12, 13 from an amplifier are not the continuous signals, are converted to the continuous signals 15 with a change over switch 7 by using a ch1 head switching pulse 14. On data 25, the pilot component at the time of composite photography is decided and generated by using the ch2 head switching pule 33 sent from a servo circuit 16 and recording data 26 is generated by a modulation circuit 17. Thus, the pilot component, at the beginning of recording at the time of the composite photography, is generated by the head switching pulse is decided and is not decided from the reproduced ID possible to have the bit error.</p> |
