Analyzing Audio Files

• Steps to analyze audio data involve multiple formats and methods.

• Focus on identifying formants within the frequency range of 0 to 5,100 Hz.

• Important to create a new object called the "formed object" to store analysis results.

Spectrum Analysis

• LPC (Linear Predictive Coding) used for spectrum analysis.

• Knowledge of the sampling frequency required:

  • Default frequency for CD-quality audio is 44,100 Hz.

  • Can find sampling frequency by checking audio file info if unfamiliar.

• Make sure to input the correct sampling frequency for accurate measurements.

Spectrum Slice Adjustment

• Adjust cursor position to derive a spectrum from audio clips.

• Cursor should be positioned in the middle of the vowel sound.

• Spectral average is calculated based on this cursor location.

Understanding the LPC Spectrum

• The LPC spectrum displays frequency on the horizontal axis and amplitude on the vertical axis.

• Cursor click gives precise measures for formants (f1, f2, f3).

• Formant frequencies may vary based on recordings, showcasing the need for multiple approaches.

Practical Application

• Recommended to practice recording yourself first before measuring others.

• Discussion about the format used for recordings (WAV files recommended).

• Importance of confirming ability to open and analyze audio files prior to project due dates.

Project Submission Guidelines

• Required submissions include:

  • A word document containing descriptions of speakers, word lists, glosses, and tables of vowel measurements.

  • Several organized WAV files for analysis, ideally not too lengthy and sorted logically.

• Emphasize linguistic insights during file organization for clearer data analysis.

Measuring Frequencies

• Recommended to round frequency measurements to the nearest Hertz and milliseconds for clarity.

• Mention of MWC values related to average frequencies for male speakers as a reference point.

• Check your measurements against these established averages to assess anomalies.

Support and Troubleshooting

• Students encouraged to communicate issues or ask for guidance on measurement discrepancies.

• Final thoughts on the excitement of visualizing speech and the process of speech analysis.

• Upcoming discussions on advanced topics like supersymmetry within phonetic study.