Programmer Guide/Command Reference/EVAL/dft - Revision history

Jw at 08:14, 18 April 2018

2018-04-18T08:14:18Z

← Older revision		Revision as of 10:14, 18 April 2018
Line 2:		Line 2:
	Inverse or forward discrete fourier transform (dft).		Inverse or forward discrete fourier transform (dft).
	;Usage:<code>dft(<var>x</var> {, <var>type</var>)</code>		;Usage:<code>dft(<var>x</var> {, <var>type</var>)</code>
	:;<var>x</var>the data vector to be transformed		:;<var>x</var>:the data vector to be transformed
	:;<var>type</var>:selects the data type of the argument and result and the transformation to be performed (default=0)		:;<var>type</var>:selects the data type of the argument and result and the transformation to be performed (default=0)
	;Result:A vector ''y'' containing the result of the transformation. The length and content of ''y'' depends on ''x'' and ''type''.		;Result:A vector ''y'' containing the result of the transformation. The length and content of ''y'' depends on ''x'' and ''type''.

2011-04-21T09:33:46Z

← Older revision		Revision as of 11:33, 21 April 2011
Line 37:		Line 37:
	\|-		\|-
	\|}		\|}
	;See also: [[../fft\|fft]], [[../ifft\|ifft]], [[../dct\|dct]], [[../cepstrum\|cepstrum]], [../lpc\|lpc]], [[../complex arithmetic\|complex arithmetic]]		;See also: [[../fft\|fft]], [[../ifft\|ifft]], [[../dct\|dct]], [[../cepstrum\|cepstrum]], [[../lpc\|lpc]], [[../complex arithmetic\|complex arithmetic]]

	[[../#Functions\|<function list>]]		[[../#Functions\|<function list>]]

2011-04-21T09:33:28Z

← Older revision		Revision as of 11:33, 21 April 2011
Line 37:		Line 37:
	\|-		\|-
	\|}		\|}
	;See also: [[~~Programmer_Guide/Command_Reference/EVAL~~/fft\|fft]], [[~~Programmer_Guide/Command_Reference/EVAL~~/ifft\|ifft]], [[~~Programmer_Guide/Command_Reference/EVAL~~/dct\|dct]], [[~~Programmer_Guide/Command_Reference/EVAL~~/cepstrum\|cepstrum]], [~~[Programmer_Guide/Command_Reference/EVAL~~/lpc\|lpc]], [[~~Programmer_Guide/Command_Reference/EVAL~~/complex arithmetic\|complex arithmetic]]		;See also: [[../fft\|fft]], [[../ifft\|ifft]], [[../dct\|dct]], [[../cepstrum\|cepstrum]], [../lpc\|lpc]], [[../complex arithmetic\|complex arithmetic]]

	[[~~Programmer_Guide~~/~~Command_Reference/EVAL~~#Functions\|<function list>]]		[[../#Functions\|<function list>]]

2011-04-13T13:53:41Z

← Older revision		Revision as of 15:53, 13 April 2011
Line 13:		Line 13:
	\|complex spectrum with N/2+1 values		\|complex spectrum with N/2+1 values
	\|N+2		\|N+2
	\|forward <code>real->complex</code> dft<BR>note: only the first half (values: 0..N/2) of the conj. sym. complex spectrum is stored in ''y''		\|forward <code>real→complex</code> dft<BR>note: only the first half (values: 0..N/2) of the conj. sym. complex spectrum is stored in ''y''
	\|-		\|-
	\|'''1'''		\|'''1'''
Line 20:		Line 20:
	\|complex spectrum with N values		\|complex spectrum with N values
	\|2N		\|2N
	\|forward <code>complex->complex</code> dft		\|forward <code>complex→complex</code> dft
	\|-		\|-
	\|'''2'''		\|'''2'''
Line 27:		Line 27:
	\|real signal with N samples		\|real signal with N samples
	\|N		\|N
	\|inverse <code>complex->real</code> dft<BR>note: this is the inverse of ''type''=0		\|inverse <code>complex→real</code> dft<BR>note: this is the inverse of ''type''=0
	\|-		\|-
	\|'''3'''		\|'''3'''
Line 34:		Line 34:
	\|complex signal with N samples		\|complex signal with N samples
	\|2N		\|2N
	\|inverse <code>complex->complex</code> dft		\|inverse <code>complex→complex</code> dft
	\|-		\|-
	\|}		\|}

2011-04-12T11:06:47Z

← Older revision		Revision as of 13:06, 12 April 2011
Line 37:		Line 37:
	\|-		\|-
	\|}		\|}
	;See also: [[Programmer_Guide/Command_Reference/EVAL/fft\|fft]], [[Programmer_Guide/Command_Reference/EVAL/ifft\|ifft]], [[Programmer_Guide/Command_Reference/EVAL/dct\|dct]], [[Programmer_Guide/Command_Reference/EVAL/cepstrum\|cepstrum]], [[Programmer_Guide/Command_Reference/EVAL/lpc\|lpc]], , [[Programmer_Guide/Command_Reference/EVAL/complex arithmetic\|complex arithmetic]]		;See also: [[Programmer_Guide/Command_Reference/EVAL/fft\|fft]], [[Programmer_Guide/Command_Reference/EVAL/ifft\|ifft]], [[Programmer_Guide/Command_Reference/EVAL/dct\|dct]], [[Programmer_Guide/Command_Reference/EVAL/cepstrum\|cepstrum]], [[Programmer_Guide/Command_Reference/EVAL/lpc\|lpc]], [[Programmer_Guide/Command_Reference/EVAL/complex arithmetic\|complex arithmetic]]

	[[Programmer_Guide/Command_Reference/EVAL#Functions\|<function list>]]		[[Programmer_Guide/Command_Reference/EVAL#Functions\|<function list>]]

2011-04-12T11:05:23Z

← Older revision		Revision as of 13:05, 12 April 2011
Line 27:		Line 27:
	\|real signal with N samples		\|real signal with N samples
	\|N		\|N
	\|inverse <code>complex->real</code> dft<BR>note: the inverse of ''type''=0		\|inverse <code>complex->real</code> dft<BR>note: this is the inverse of ''type''=0
	\|-		\|-
	\|'''3'''		\|'''3'''

2011-04-12T11:04:55Z

← Older revision		Revision as of 13:04, 12 April 2011
Line 13:		Line 13:
	\|complex spectrum with N/2+1 values		\|complex spectrum with N/2+1 values
	\|N+2		\|N+2
	\|forward <code>real->complex</code> dft<BR>:*only the first half (values: 0..N/2) of the conj. sym. complex spectrum is stored in ''y''		\|forward <code>real->complex</code> dft<BR>note: only the first half (values: 0..N/2) of the conj. sym. complex spectrum is stored in ''y''
	\|-		\|-
	\|'''1'''		\|'''1'''

2011-04-12T11:04:34Z

← Older revision		Revision as of 13:04, 12 April 2011
Line 13:		Line 13:
	\|complex spectrum with N/2+1 values		\|complex spectrum with N/2+1 values
	\|N+2		\|N+2
	\|forward <code>real->complex</code> dft<BR>~~note~~: only the first half (values: 0..N/2) of the conj. sym. complex spectrum is stored in ''y''		\|forward <code>real->complex</code> dft<BR>:*only the first half (values: 0..N/2) of the conj. sym. complex spectrum is stored in ''y''
	\|-		\|-
	\|'''1'''		\|'''1'''

2011-04-12T11:03:57Z

← Older revision		Revision as of 13:03, 12 April 2011
Line 13:		Line 13:
	\|complex spectrum with N/2+1 values		\|complex spectrum with N/2+1 values
	\|N+2		\|N+2
	\|<code>real->complex</code> ~~forward~~ dft<BR>note: only the first half (values: 0..N/2) of the conj. sym. complex spectrum is stored in ''y''		\|forward <code>real->complex</code> dft<BR>note: only the first half (values: 0..N/2) of the conj. sym. complex spectrum is stored in ''y''
	\|-		\|-
	\|'''1'''		\|'''1'''
Line 20:		Line 20:
	\|complex spectrum with N values		\|complex spectrum with N values
	\|2N		\|2N
	\|<code>complex->complex</code> ~~forward~~ dft		\|forward <code>complex->complex</code> dft
	\|-		\|-
	\|'''2'''		\|'''2'''
Line 27:		Line 27:
	\|real signal with N samples		\|real signal with N samples
	\|N		\|N
	\|<code>complex->real</code> ~~inverse~~ dft<BR>note: the inverse of ''type''=0		\|inverse <code>complex->real</code> dft<BR>note: the inverse of ''type''=0
	\|-		\|-
	\|'''3'''		\|'''3'''
Line 34:		Line 34:
	\|complex signal with N samples		\|complex signal with N samples
	\|2N		\|2N
	\|<code>complex->complex</code> ~~inverse~~ dft		\|inverse <code>complex->complex</code> dft
	\|-		\|-
	\|}		\|}

2011-04-12T11:02:06Z

← Older revision		Revision as of 13:02, 12 April 2011
Line 13:		Line 13:
	\|complex spectrum with N/2+1 values		\|complex spectrum with N/2+1 values
	\|N+2		\|N+2
	\|~~'''~~real->complex~~'''~~ forward dft<BR>note: only the first half (values: 0..N/2) of the conj. sym. complex spectrum is stored in ''y''		\|<code>real->complex</code> forward dft<BR>note: only the first half (values: 0..N/2) of the conj. sym. complex spectrum is stored in ''y''
	\|-		\|-
	\|'''1'''		\|'''1'''
Line 20:		Line 20:
	\|complex spectrum with N values		\|complex spectrum with N values
	\|2N		\|2N
	\|~~'''~~complex->complex~~'''~~ forward dft		\|<code>complex->complex</code> forward dft
	\|-		\|-
	\|'''2'''		\|'''2'''
Line 27:		Line 27:
	\|real signal with N samples		\|real signal with N samples
	\|N		\|N
	\|~~'''~~complex->real~~'''~~ inverse dft<BR>note: the inverse of ''type''=0		\|<code>complex->real</code> inverse dft<BR>note: the inverse of ''type''=0
	\|-		\|-
	\|'''3'''		\|'''3'''
Line 34:		Line 34:
	\|complex signal with N samples		\|complex signal with N samples
	\|2N		\|2N
	\|~~'''~~complex->complex~~'''~~ inverse dft		\|<code>complex->complex</code> inverse dft
	\|-		\|-
	\|}		\|}