Development of an Error Correction Technique for Audio Signals Recorded on Optical Compact Disk
A. O. Atijosan
Department of Electronic and Electrical Engineering, Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria.
S. A. Adeniran
Department of Electronic and Electrical Engineering, Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria
R. A. Badru *
Department of Electronic and Electrical Engineering, Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
The occurrence of high random bit error rates alongside long burst errors in playback audio signal recorded on compact disk (CD) poses a problem beyond what the usual Cross Interleaved Reed-Solomon Code (CIRC) may handle. In this paper we propose a technique that makes use of the orthogonality properties of Walsh code to handle these types of errors. Results obtained show that the technique can correct for burst errors exceeding 7000 bits and random errors at Signal to Noise Ratio of -5dB at the recording channel. This performance exceeds that of CIRC in terms of maximum correctible burst error length and random error correction rate. The proposed technique will effectively correct long burst and high random bit errors in playback audio signals recorded on optical CD.
Keywords: Walsh code, random error, burst error, CIRC, audio signal