| 摘要 |
PROBLEM TO BE SOLVED: To provide an equalizer circuit which has a simple configuration and less noise and has parameter easily adjusted. SOLUTION: The equalizer circuit includes a first amplification circuit 50 for amplifying an input signal and then outputting it, a filter circuit 51 having the input signal applied thereto, a second amplification circuit 52 having an output signal of the filter circuit 51 input thereto, and an addition circuit 53 for adding an output signal of the first amplification circuit 50 and that of the second amplification circuit 52 in opposite phases. A plurality of pairs of filter circuits 51 and second amplification circuits 52 may be included. Furthermore, the equalizer circuit includes an equalization characteristic setting circuit 54 for controlling gains of amplification circuits and characteristics of filter circuits. The equalizer circuit does not require components and elements of high precision or low noise and has a simple circuit configuration. Since the equalizer circuit is not made sensitive to a high band, noise reduction is achieved. Furthermore, characteristics of the equalizer circuit can be continuously changed. COPYRIGHT: (C)2007,JPO&INPIT
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