| 摘要 |
<p>PURPOSE:To provide a recorder with a small circuit scale and generating a notch part and a pilot signal. CONSTITUTION:An input data group is inputted to a bit 0 insertion circuit 1 and a bit 1 insertion circuit 2, and by respective circuits, a special bit is inserted making 0 and the special bit is inserted making 1 at every m bit. The outputs of the bit 0 insertion circuit 1 and the bit 1 insertion circuit 2 are inputted to a precoder 3 and the precoder 4 respectively. By the precoders 3, 4, prescribed precode are performed to output to a DSV calculation circuit 5. In the DSV calculation circuit 5, the DSV of the outputs of the precoders are calculated to be outputted to a frequency component extraction circuit 7. In the frequency component extraction circuit 7, the frequency components of f1 and f2 of the output of the DSV calculation circuits 5, 6 are extracted to be outputted to a comparator circuit 8. In the comparator circuit 8, the frequency component when the special bit is made 0 is compared with the same when the speial bit is made 1, and the special bit close to a required frequency characteristic is decided to be outputted by an output selection circuit 9.</p> |
