SIGNAL PROCESSING DEVICE, SIGNAL RECORDING DEVICE AND SIGNAL REPRODUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a signal processing device, a signal recording device and a signal reproducing device in which signal processing such as equalizing processing is realized with small scale and inexpensive hardware. SOLUTION: A decimation filter 4 applies down-sampling to a digital signal of 64fs /1-bit outputted from aΣΔmodulator 3 (fs : sampling signal). A signal processing circuit 5 applies equalizing processing to a fs /24-bit digital signal from the decimation filter 4. A delay device 6 delays the fs /24-bit digital signal by a processing time in the signal processing circuit 5. A subtractor 7 calculates a difference between the fs /24-bit digital output signal from the signal processing circuit 5 and the fs /24-bit digital delay signal. An interpolation filter 8 applies oversampling to the result of the subtraction of the fs /24 bit digital signal to obtain a 24 bit digital signal with a sampling frequency of 64fs . A delay device 9 delays the 64fs /1-bit digital signal from theΣΔmodulator 3 by a total processing time of the decimation filter 4, the signal processing circuit 5, the subtractor 7 and the interpolation filter 8.