This page provides information on how and by whom WaveSurfer was developed, why WaveSurfer was selected for a clinical tool for articulation therapy, and what microphone is recommended for use with WaveSurfer in the clinic.
WaveSurfer is an free open source program developed by Kåre Sjölander and Jonas Beskow at the Centre for Speech Technology (CTT) at KTH in Stockholm, Sweden. When a program is called “open source,” the developers allow others to make modifications or improvements to the program. The first version was released in January 2000 but it has since been updated numerous times; its latest release was on February 2, 2011.
You can read more details about WaveSurfer in this article written by the developers.
After extensive research and a thorough search for an affordable and accessible speech visualization tool, I selected WaveSurfer for this project as a tool to dispense to practicing speech-language pathologists for the following reasons:
- Provides real-time analysis
- Compatible on both PC and Mac computers
- Cost: Free
- Settings can be easily modifiable for multiple clinical purposes
- Spectrograms of target productions can be easily displayed below client productions by opening a second window of WaveSurfer and positioning it accordingly
- Extra features: formant tracing, target line
Because WaveSurfer uses your computer’s own audio processor, it does not require additional expensive and bulky hardware components to convert the signal into a spectrogram. Coupled with a simple and inexpensive microphone like the Logitech USB desktop microphone, it is easy for traveling clinicians to download the program on a laptop and use virtually anywhere. Read more.