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Digital electronic devices have specifications using IC as the main component where the signal processing on the circuit board was processed digitally. Signal analog process signals with digital devices through the ADC / DAC (Analog-to-Digital Converter / Digital-to-Analog Converter) procedure. In the ADC mechanism, analog signals through sampling, quantization and coding processes, so its become digital signals in the form of binary code. Then the binary code is input into the DAC. Many techniques and methods can be used by DAC to process digital signals to recover the desired analog signal, one of which is the interpolation technique. In this study, two interpolation methods will be analyzed to determine the performance of the audio signal performance on the DAC mechanism, namely Newton Interpolation and Lagrange Interpolation. Performance of each method is expressed as signal-to-noise ratio (SNR). The research methods that will be carried out include making software, reading audio sound data, process and signal analysis through ADC / DAC procedures, signal processing and analysis with interpolation techniques, and calculating SNR output signals. The results of the analysis are graphical and SNR values. Next, SNR is compared between Newton Interpolation and Lagrange Interpolation techniques.