chirp
Purpose:
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Generate swept-frequency cosine signal
Enter:
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chirp <priority> <output_variable> <active> [duration] [start_freq] [final_freq] [method] [initial_phase]
Where:
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priority
Specify the task priority.
output_variable
Specify the output variable of chirp – to be used as a FF term in the controller for system ID.
active
The active ON/OFF flag; specify the name of the logical variable which represents the flag.
duration
Optional. Specify the duration of sweep in seconds (another sweep will start after the interval elapses). If omitted, the default duration of a sweep is 1 second (1s)
start_freq
Optional. Specify the starting frequency in Hz. If omitted, the default is f0 = 0Hz
final_freq
Optional. Specify the final frequency in Hz. If omitted, the default is f1 = 25Hz
method
Optional. Specify the method. If omitted, the default is ‘lin’. Other options are ‘quadr’ and “log”.
initial_phase
Optional. Specify the initial phase in deg. If omitted, the default is phi = 0 deg
Example:
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chirp 19 chirp_out chirp_active 10 0.1 10 ‘lin’ 3.14 &’