Question
Is there an error in the documentation for the CHIRP function using a logarithmic sweep in Signal Processing Toolbox 6.2.1 (R14SP1)? The instantaneous frequency sweep equation for the CHIRP function does not match what I observe in the output of the function in Signal Processing Toolbox 6.2.1 (R14SP1).
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Expert Answer
Neeta Dsouza
PhD Expert
Answered Nov 20, 2025
This change has been incorporated into the documentation in Release 14 Service Pack 3 (R14SP3). For previous releases, read below for any additional information:
This has been verified as an error within the documentation for Signal Processing Toolbox 6.2.1 (R14SP1) in the help for the CHIRP function. The documentation should read as follows:
logarithmic specifies an instantaneous frequency sweep fi(t) given by
fi(t) = f0 * (beta)^t
wherer
beta = (f1/f0) ^ (1/t1)
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