A two-channel approach to the removal of impulsive noise from archived recordings

We discuss the extraction of two signals from a monophonic gramophone record, and observe that the impulsive noise is significantly different in the two. This, coupled with the redundancy of the desired parts of the signals, has great advantages in the processes of impulsive noise detection and removal. It is simple to obtain two suitable signals by using a stereo replay cartridge, and we develop detection and interpolation algorithms that use such a pair of signals. We present the results of computer simulations and informal listening tests on archive material. In both cases the two-channel method is found to be an improvement over a similar single-channel algorithm, with little change in computational cost.<
>