a problem when I try to save and process the data points

[chrisqi2008]

Hi,
I am new to this software, I have a problem when I try to save and process the data and I didn't find much information in their help
Say I record a sound for 10 second. I can see the peaks in time domain during recording (the waveform's amplitude normalized 1), when I try to export these data points, the only place I know is "Analyze"--> "Plot spectrum", it shows the data after FFT. But after I did IFFT in Matlab, the waveform doesn't have any peaks as it's shown during the recording.
so my question is
what is their normalized amplitude 1?
how they do their FFT? (use the air reference pressure 20 micropascal or not, since all the data in negative 20~70dB)
how to export data points in time domain only?
Can anyone help me with this? THanks a LOOOOOOOT~!

angela

[Gale Andrews]

Hi,
I am new to this software, I have a problem when I try to save and process the data and I didn't find much information in their help
Say I record a sound for 10 second. I can see the peaks in time domain during recording (the waveform's amplitude normalized 1), when I try to export these data points, the only place I know is "Analyze"--> "Plot spectrum", it shows the data after FFT. But after I did IFFT in Matlab, the waveform doesn't have any peaks as it's shown during the recording.
so my question is
what is their normalized amplitude 1?
how they do their FFT? (use the air reference pressure 20 micropascal or not, since all the data in negative 20~70dB)
how to export data points in time domain only?
Can anyone help me with this?

We cannot offer you help with Matlab. You can read the MATLAB docs or contact Mathworks support.

There are better free audio analysis tools than Audacity, such as Sonic Visualiser.

There is no direct way to export sample vs.time data from Audacity. As a workaround you can send data from an Audacity track to SOX using the Audacity command line encoder.



Gale