Type Definition spectrum_analyzer::ComplexSpectrumScalingFunction [−][src]
type ComplexSpectrumScalingFunction = Box<dyn Fn(f32, f32, f32, f32) -> Box<dyn Fn(f32) -> f32>>;
Describes the type for a function factory that generates a function that can scale/normalize
the data inside FrequencySpectrum.
Complex means it’s not basic. It has nothing to do with complex numbers.
This can archive exactly the same as crate::SimpleSpectrumScalingFunction
but is capable of doing more complex logic, i.e. you have access to min, max,
or median!
This can be used for example to subtract min value from all values,
if min is > 0. The signature is the following:
(min: f32, max: f32, average: f32, median: f32) -> fn(f32) -> f32
i.e. you provide a function which generates a function that gets
applied to each element. The input arguments are automatically calculated
by FrequencySpectrum.
The scaling only affects the value/amplitude of the frequency but not the frequency itself.