Digital signal processing method and apparatus

An interpolation apparatus for interpolating a defective data block constituted by a predetermined number of bits, said defective data block having been produced during transmission of interleaved digital signal digitized by .SIGMA..DELTA. modulation, the apparatus comprising:

• an error detector for detecting defective data contained in the interleaved .SIGMA..DELTA. modulated digital signals;
• means for generating an error flag corresponding to the defective data in accordance with error detection information from the error detector;
• a de-interleave unit for de-interleaving the interleaved .SIGMA..DELTA. modulated digital signals;
• and
• an interpolator for replacing the defective data contained in selected de-interleaved digital signal with substitute data, wherein the interpolator includes a moving averaging unit for multiplying the defective data block with a predetermined coefficient and data ahead of and behind the defective data block with predetermined variable coefficients, an estimator for estimating a replacement data pattern of the de-interleaved digital signals based upon an output result of the averaging unit, and an interpolated data generator for determining the substitute data for the defective data block based upon the replacement data pattern estimated by the estimator and producing a .SIGMA..DELTA. modulated digital signal with a defective data block having been interpolated.

A receiving apparatus for receiving an interleaved digital data signal digitized by .SIGMA..DELTA. modulation from a transmitting means, comprising:

• error detecting means for detecting defective data contained in the interleaved .SIGMA..DELTA. modulated digital data signal;
• control means for generating error flag information corresponding to a location in the interleaved .SIGMA..DELTA. modulated digital data signal of the defective data in accordance with error detection information from the error detecting means;
• de-interleave means for de-interleaving the interleaved .SIGMA..DELTA. modulated digital signal and for receiving the error flag information from the control means;
• and
• interpolation means for replacing the defective data with interpolated data based upon a replacement data pattern generated by estimating a number of "1"s and "0"s contained in the defective data and producing a .SIGMA..DELTA. modulated digital data signal having defective data replaced with interpolated data.

A transmitting and receiving apparatus in which a transmitting unit transmits interleaved digital data to a receiving unit, comprising:

• converting means for converting an input analog audio signal into a digital data stream digitized by a .SIGMA..DELTA. modulation method;
• interleave means for interleaving data in the .SIGMA..DELTA. modulated digital data stream from the converting means;
• error detecting means for detecting defective data present in the interleaved .SIGMA..DELTA. modulated digital data stream from the interleave means;
• control means for generating digital error flag information corresponding to a location of the defective data in accordance with error detection information from the error detecting means;
• de-interleave means receiving the interleaved .SIGMA..DELTA. modulated digital data stream and the error detection information for de-interleaving the interleaved digital data stream;
• and
• interpolation means for replacing the defective data in the de-interleaved digital signal with substitute data and including estimating means for estimating a data pattern of the substitute data based on a moving average of the energy contained in the defective data, and interpolated data generating means for determining interpolated data for the defective data based upon the data pattern of the substitute data estimated by the estimating means and producing a .SIGMA..DELTA. modulated digital data stream having defective data replaced with interpolated data.