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# Power-of-two FFTs

Module by: Douglas L. Jones. E-mail the author

Summary: FFTs of length equal to a power of two are by far the most commonly used. Radix-2 decimation-in-time and decimation-in-frequency algorithms are the simplest power-of-two algorithms. Radix-4 and higher-radix algorithms require somewhat fewer complex multiplications but the same number of complex additions. The split-radix algorithm requires fewer complex multiplies than other power-of-two algorithms.

The efficiency of an FFT implementation depends on more than just the number of computations. Efficient FFT programming tricks can make up to a several-fold difference in the run-time of FFT programs. Alternate FFT structures can lead to a more convenient data flow for certain hardware. As discussed in choosing the best FFT algorithm, certain hardware is designed for, and thus most efficient for, FFTs of specific lengths or radices.

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#### Definition of a lens

##### Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

##### What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

##### Who can create a lens?

Any individual member, a community, or a respected organization.

##### What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

#### Definition of a lens

##### Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

##### What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

##### Who can create a lens?

Any individual member, a community, or a respected organization.

##### What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks