Signal processing apparatus, signal recording apparatus, and signal reproducing apparatus

摘要

A signal processing circuit for equalizing includes circuitry for down-sampling an original signal of a one-bit digital signal having a sampling frequency fs (Hz) to a lower sampling frequency used for converting the signal into a multi-bit signal, extracting a given band from the multi-bit signal, equalizing the extracted band, over-sampling the equalized band through the effect of an interpolation filter for converting it to a multi-bit signal, and adding the over-sampled multi-bit signal to the original signal delayed by a given time.