Signal processing apparatus, signal recording apparatus, and signal reproducing apparatus
AssigneeSony Corporation
InventorsYuji Tsuchida, Ayataka Nishio
Life of this patent
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Abstract
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.
Claims7
A signal processing apparatus comprising:
- means for down-sampling an input signal having a sampling frequency fs;
- means for extracting selected band components from an output signal of said means for down-sampling;
- signal processing means for performing a predetermined signal treatment on said selected band components extracted by said means for extracting;
- over-sampling means for over-sampling an output signal from said signal processing means and producing a signal having the sampling frequency fs;
- delaying means for delaying said signal having said sampling frequency fs by a cumulative processing time of said means for down-sampling, said means for extracting, said signal processing means, and said over-sampling means;
- and
- means for adding an output signal of said delaying means to said signal having the sampling frequency fs produced by said over-sampling means.
A signal recording apparatus comprising:
- means for down-sampling an input signal having a sampling frequency fs;
- means for extracting selected band components from an output signal of said means for down-sampling;
- signal processing means for performing a predetermined signal treatment on said selected band components extracted by said means for extracting;
- means for over-sampling an output signal from said signal processing means and producing a signal having said sampling frequency fs;
- means for delaying said input signal having said sampling frequency fs by a cumulative processing time of said means for down-sampling, said means for extracting, said signal processing means, and said over-sampling means;
- means for adding an output signal of said means for delaying to said signal having said sampling frequency fs produced by said means for over-sampling;
- and
- means for sigma-delta modulating an output signal of said means for adding into a one-bit digital signal;
- and
- means for recording said one-bit digital signal from said means for sigma-delta modulating.
A signal reproducing apparatus comprising:
- means for down-sampling an input signal having a sampling frequency fs;
- means for extracting selected band components from an output signal of said means for down-sampling;
- signal processing means for performing a predetermined signal treatment on said selected band components extracted by said means for extracting;
- means for over-sampling an output signal from said signal processing means and producing a signal having said sampling frequency fs;
- means for delaying said input signal having said sampling frequency fs by a cumulative processing time of said means for down-sampling, said means for extracting, said signal processing means, and said means for over-sampling;
- means for adding an output signal of said means for delaying to said signal having said sampling frequency fs produced by said means for over-sampling;
- means for sigma-delta modulating an output signal of said means for adding into a one-bit digital signal;
- and
- means for converting said one-bit digital signal from said means for sigma-delta modulating into an analog signal.
Dependencies are inferred from the claim text.