Reproduction signal processing device
First Claim
1. A reproduction signal processing device, comprising:
- an A/D converter for quantizing an input analog reproduction signal into digital reproduction signal data;
an adaptive equalizer for equalizing the reproduction signal data with a characteristic controlled according to data input to the adaptive equalizer and data output from the adaptive equalizer; and
a PLL circuit for outputting a clock signal which is in synchronization with the reproduction signal data;
an analog filter for removing noise from the reproduction signal; and
a digital filter provided between the A/D converter and the adaptive equalizer, the digital filter equalizing the reproduction signal data with a fixed characteristic, wherein the PLL circuit outputs the clock signal based on an output of the digital filter.
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Abstract
For the purpose of achieving reproduction of data recorded in an optical disc, or the like, with high accuracy and hence increasing the recording density, a digital filter is provided at a position between an A/D converter and an adaptive equalizing filter and between the A/D converter and a PLL circuit. Basically, an analog filter has only a low pass function. In a learning period prior to reproduction, a controller section sets various tap coefficients in the digital filter to determine a tap coefficient such that a jitter value detected in the PLL circuit is minimum. In a reproduction operation, the determined tap coefficient is set in the digital filter to perform optimum pre-equalization, and as a result, reproduction of data is performed with high accuracy.
65 Citations
15 Claims
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1. A reproduction signal processing device, comprising:
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an A/D converter for quantizing an input analog reproduction signal into digital reproduction signal data;
an adaptive equalizer for equalizing the reproduction signal data with a characteristic controlled according to data input to the adaptive equalizer and data output from the adaptive equalizer; and
a PLL circuit for outputting a clock signal which is in synchronization with the reproduction signal data;
an analog filter for removing noise from the reproduction signal; and
a digital filter provided between the A/D converter and the adaptive equalizer, the digital filter equalizing the reproduction signal data with a fixed characteristic, wherein the PLL circuit outputs the clock signal based on an output of the digital filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification