US 7,321,620 B2 | ||
Equalizer and reproduction signal processing device | ||
Hiroyuki Nakahira, Kyoto (Japan); Koichi Nagano, Osaka (Japan); Koji Okamoto, Osaka (Japan); and Akira Yamamoto, Osaka (Japan) | ||
Assigned to Matsushita Electric Industrial Co., Ltd., Osaka (Japan) | ||
Filed on Mar. 10, 2003, as Appl. No. 10/383,746. | ||
Claims priority of application No. 2002-086120 (JP), filed on Mar. 26, 2002. | ||
Prior Publication US 2003/0185291 A1, Oct. 02, 2003 | ||
Int. Cl. H03H 7/30 (2006.01); H03H 7/40 (2006.01); H03K 5/159 (2006.01) |
U.S. Cl. 375—232 [375/231; 360/65] | 6 Claims |
1. An equalizer for performing a waveform equalization on an input signal, comprising:
a signal delay section including a plurality of delay elements connected in series with one another for delaying the input
signal by the delay elements;
selection signal production means for producing a selection signal for selecting one of a plurality of tap signal coefficient
groups as a selected coefficient group based on a reference signal, which is one of a plurality of tap signals output from
the signal delay section;
a coefficient multiplication section for selecting the selected coefficient group based on the selection signal, and multiplying
the tap signals output from the signal delay section with selected tap coefficients that belong to the selected coefficient
group by using a plurality of coefficient units provided in the coefficient multiplication section, respectively; and
an adder for adding together the tap signals from the coefficient multiplication section, which have been multiplied with
the selected tap coefficients, to output a sum as a waveform-equalized signal.
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