Audacity is a free digital audio recorder and editor. Together with a sound card and soundcard probes, it can be used to record the input signal and the corresponding response from a circuit in a wav-file for subsequent analysis, e.g., in Matlab.
Open and unzip audacity-win-1.2.6.zip to a location of your choice.
To start the program, run audacity.exe.
When the program is run for the first time, you can choose to associate audacity project (.AUP) files with Audacity and you also get to choose the language that Audacity uses.
Make sure the line input is chosen.
Click on "Edit" and select "Preferences..." to adjustsome important settings before using Audacity for the first time.
Use the sound card (and not the Microsoft Sound Mapper) as the recording device.
Then select 2 channels (stereo) so that you can record both the input to a circuit and the response from it.
Next, set the default sample format to 16 bits and check that the sampling rate is 44100 Hz.
Set the uncompressed export format to Microsoft 16 bit PCM wav format.
Now you should be able to press the record button and record from the line input of the sound card.
== To be completed ==
©2003-2007, P. Mathys. Last revised: 2-01-07, PM.