| 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, special bits are inserted making 0, 1 at every m bit of the input data group respectively. The outputs of the bit 0 insertion circuit 1 and the bit 1 insertion circuit 2 are inputted to precoders 3, 4 respectively, and prescribed precode is performed to be outputted to DSV calculation circuits 5, 6. In the DSV calculation circuits 5, 6, the DSV of inputted precode data at every (m+1) bit are calculated to be outputted to subtracters 8, 9. In a reference DSV generation circuit 7, the reference DSV with the frequency of the generated pilot signal is generated to be outputted to the subtracters 8, 9. In the subtracters 8, 9, differences between the DSVs of the precode data when the special bit is 0 and when the special bit is 1 calculated by the DSV calculation circuits 5, 6 respectively and the reference DSV generated by the reference DSV generation circuit is taken to be outputted to a digital filter 10.</p> |
