This example VI utilizes the Advanced Signal Processing Toolkit to perform voice analysis on a sound file.
I unfortunately cannot get credit for this package but I don't know who the author is. For a very detailed tutorial on the subject of voice recognition and the original files, please visit Using LabVIEW for Voice Signal Analysis. The Advanced Signal Processing Toolkit includes the Modeling and Prediction VIs that you can use to obtain the LPC coefficients or AR model coefficients, as shown in the figures below. The LabVIEW Signal Processing VIs include the Scaled Time Domain Window VI and the FFT VI. You can use these VIs to apply a window to the source signal and calculate the DFT of the signal block, respectively. The Advanced Signal Processing Toolkit also includes the Correlation and Spectral Analysis VIs that you can use to calculate the real cepstrum of a signal. In the figures below, you use the WA Multiscale Peak Detection VI to detect the resonance peaks in the cepstrum.