The cl-dct Reference Manual

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The cl-dct Reference Manual

This is the cl-dct Reference Manual, version 1.0.0, generated automatically by Declt version 2.3 "Robert April" on Wed Mar 14 03:14:18 2018 GMT+0.


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1 Introduction

cl-dct

Build Status Coverage Status

Discrete cosine transform (DCT) is a signal processing algorithm that compresses a signal. It's similar to a Fourier transform. DCT is often used in speech recognition for computing MFCC features.

There are a number of different versions and implementations of DCT. This implementation mimics the one in Matlab. You should also get the same results in scipy with the command:

scipy.fftpack.dct([4., 3., 5., 10.], norm='ortho')

The idct() implementation is equivalent to the Matlab implementation and the scipy command:

scipy.fftpack.idct([4., 3., 5., 10.], norm='ortho')

This is an O(n²) implementation. O(n log(n)) implementations are also possible.


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2 Systems

The main system appears first, followed by any subsystem dependency.


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2.1 dct

Author

Ben Lambert <belambert@mac.com>

License

Apache-2.0

Description

Discrete cosine transform.

Version

1.0.0

Dependency

alexandria

Source

dct.asd (file)

Component

src (module)


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3 Modules

Modules are listed depth-first from the system components tree.


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3.1 dct/src

Parent

dct (system)

Location

src/

Components

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4 Files

Files are sorted by type and then listed depth-first from the systems components trees.


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4.1 Lisp


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4.1.1 dct.asd

Location

dct.asd

Systems

dct (system)


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4.1.2 dct/src/package.lisp

Parent

src (module)

Location

src/package.lisp

Packages

dct


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4.1.3 dct/src/dct.lisp

Dependency

package.lisp (file)

Parent

src (module)

Location

src/dct.lisp

Exported Definitions

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5 Packages

Packages are listed by definition order.


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5.1 dct

Source

package.lisp (file)

Use List

common-lisp

Exported Definitions

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6 Definitions

Definitions are sorted by export status, category, package, and then by lexicographic order.


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6.1 Exported definitions


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6.1.1 Functions

Function: dct ARRAY &key TRUNCATED

Discrete cosine transform (DCT).
DCT-II taken from:
http://en.wikipedia.org/wiki/Discrete_cosine_transform#DCT-II
Further multiplied the X0 term by 1/√2 and multiply the resulting matrix by an overall scale factor of √(2/N) ...(?)

Package

dct

Source

dct.lisp (file)

Function: idct ARRAY

Adapted from: http://www.mathworks.com/help/toolbox/signal/ref/idct.html

Package

dct

Source

dct.lisp (file)


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Appendix A Indexes


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A.1 Concepts

Jump to:   D   F   L   M  
Index Entry  Section

D
dct.asd: The dct<dot>asd file
dct/src: The dct/src module
dct/src/dct.lisp: The dct/src/dct<dot>lisp file
dct/src/package.lisp: The dct/src/package<dot>lisp file

F
File, Lisp, dct.asd: The dct<dot>asd file
File, Lisp, dct/src/dct.lisp: The dct/src/dct<dot>lisp file
File, Lisp, dct/src/package.lisp: The dct/src/package<dot>lisp file

L
Lisp File, dct.asd: The dct<dot>asd file
Lisp File, dct/src/dct.lisp: The dct/src/dct<dot>lisp file
Lisp File, dct/src/package.lisp: The dct/src/package<dot>lisp file

M
Module, dct/src: The dct/src module

Jump to:   D   F   L   M  

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A.2 Functions

Jump to:   D   F   I  
Index Entry  Section

D
dct: Exported functions

F
Function, dct: Exported functions
Function, idct: Exported functions

I
idct: Exported functions

Jump to:   D   F   I  

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A.3 Variables


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A.4 Data types

Jump to:   D   P   S  
Index Entry  Section

D
dct: The dct system
dct: The dct package

P
Package, dct: The dct package

S
System, dct: The dct system

Jump to:   D   P   S