Computing devices and methods for converting audio signals to text

A computer-implemented method for improving the accuracy of voice to text conversion, the method comprising:

• receiving an input audio signal that includes spoken language uttered by a speaker;
• and
• analyzing the input audio signal;
• wherein the analyzing the input audio signal includes:
• comparing, with a computing device, one or more measured formant values to one or more model formant values, wherein each of the one or more measured formant values corresponds to a respective measured formant component of one or more measured formant components of an individual phoneme in the input audio signal, and wherein each of the one or more model formant values corresponds to a respective model formant component of one or more model formant components of the individual phoneme in a trained model of an automatic speech recognition (ASR) application;
• and
• determining, with the computing device, one or more differences between the one or more measured formant values and the one or more model formant values.