The Fourier analysis window is used to invoke the cvanal soundfile utility, which performs a single Fourier transform on its input. The resulting data can be used to perform convolutions via the convolve opcode.

The following controls are present in the window:

Sound Input File

The name of the file containing the sound to be analyzed. For realtime input, enter either adc or devaudio.
NOTE: Realtime sound input is only available when the Csound Server is running.
This is a mandatory entry field.

Analysis Output File

The name of the generated file containing the resulting data.
This is a mandatory entry field.

Sample Rate

If present, indicates the sample rate of the sound input file. If omitted, the sample rate in the sound file's header is used. For headerless files, analysis assumes a default sample rate of 10000Hz.

Channel Number

Selects one of the channels in the sound input file. Default is channel 1.

Begin Time

Offset (in seconds) from the start of the input file to the start of the segment to be analyzed.

Duration

Length (in seconds) of the analyzed segment of the input file. If this parameter is omitted, analysis proceeds to the end of the file.

Analyze

Clicking on this button (when enabled) starts analysis using the given parameters.

Abort

Clicking on this button (when enabled) causes a running analysis to be aborted.