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).
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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