Error analysis of ADPCM-FFT
Mahesh Mohan M. R., V. Rao · IEEE Transactions on Acoustics Speech and Signal Processing · 1979
A realization of the discrete Fourier transform using the ADPCM as the analog-to-digital conversion scheme is presented. Quantitative analysis is given for the output noise due to truncation error, roundoff error, input quantization, and due to finite bit representation of coefficients.