Sound data interpolating circuit

Abstract

A sound data interpolating circuit includes data converting means for converting inputted serial sound data to parallel sound data to thereby output the same; pulse generating means for generating interpolating pulses, channel gating pulses and loading pulses according to a double error signal outputted from a BCH error correction circuit and a clock signals generated from clock generating means; data extracting means for maintaining prior data during a double error occurrence and outputting data interpolated using the prior and following non-erroneous data in accordance with the interpolating pulses inputted from the pulses and clock signals generated from the clock generating means; data selecting means for outputting data outputted from the data extracting means according to a sound channel; and average value calculating means for striking an average from the data outputted from the data converting means and data selecting means to thereafter output the average value. The sound data interpolating circuit improves tone quality by performing an average value interpolation using the prior and following non-erroneous samples per respective sound channels in the case of an individual double error, and by performing pre-interpolation in the case of continuous double error occurrence, in a state where correction is impossible by way of BCH error correction during occurrence of sample errors in aural PCM data.