| 摘要 |
In a device or a recording apparatus for converting n-bit data into m-bit data with different conversion methods, and selecting and outputting one of a plurality of converted m-bit data, when controlling output means in accordance with the plurality of m-bit data, a specific signal component is extracted from each of the plurality of m-bit data, the absolute values of the plurality of extracted outputs are obtained, and at least one of the plurality of absolute values or the extracted output corresponding thereto is selectively output (recorded). Thus, superposition and suppression of a specific frequency component can be realized by a single circuit having a very simple circuit configuration. As a result, the size and the cost of a digital signal recording apparatus utilizing a modulation circuit of this kind can be reduced.
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