Design of efficient digital interpolation filters and sigma-delta modulator for audio DAC

A narrowband sigma-delta (SigmaDelta) audio digital-to-analog converter (DAC) with a digital signal interpolation part and single loop, 5-bit SigmaDelta modulator in the final stage is developed. To reduce sensitivity of digital-to-analog converter (DAC) nonlinearities of the last stage, dynamic element matching (DEM) is introduced. This paper presents a MATLAB description modelling approach of the proposed DAC architecture. The SigmaDelta modulator design can be configured as a 3^rd or 5^th order and allows 24-bit PCM at sampling rate of 64 kHz for DVD audio application.