Frame Tool

The Frame analysis tool is apart of the Enhancement application and provides useful information into the short-time Fourier and time domain representations of a speech signal. On this page you will find information on how to use the frame analysis tool.

What is the frame analysis tool?

This tool allows the interpretation of small blocks or slices of the spectrogram both in time and frequency directions, the slice size is the window duration taken from the AMS configuration. If the window duration is changed the time and frequency content in this tool changes.

STFT of speech

short time Fourier analysis of a speech signal

How to interpret frame analysis graphs

There are three main components to the frame analysis tool: 1. the time domain of the desired window; 2. The Fourier magnitude spectrum of the desired window; and,  3. the spectrogram (bottom), which is taken from the input speech signal. The AMS configuration, window duration, frame shift and analysis window all have great affects on what is displayed in the frame analysis tool. This is can be used to demonstrate stationarity concerns with a speech signal and windowing methods [1].

How to use the frame analysis tool

This tool is easy to use and only requires you to drag the red cursor across the spectrogram to select the desired frame to view its corresponding time and magnitude graphs. Above and to the right of the spectrogram is the selected frame number and total frame count.

How to view and share frame analysis graphs

Once you choose to view or share in the menu, three images are created. Those three imaged are: 1. short-time magnitude spectrum, 2. time domain graph, and 3. both the magnitude and time graphs. These images are formatted in such away to allow placement directly into academic or educational literature.

These images can be shared through e-mail, bluetooth, social networks and any other supporting applications by pressing:

menu > Share

References

[1] J. Proakis and D. Manolakis, “Digital Signal Processing: Principals,Algorithms, and Applications”. New Jersey, USA: Pearson Prentice Hall, 2007.