Signal package
The signal package is part of the Octave Forge project and provides signal processing algorithms for use with Octave. The functions provided by the signal package include creation of waveforms, FIR and IIR filter design, spectral analysis, Fourier and other transforms, window functions, and resampling and rate changing. There are also some wavelet functions included, because there is no separate wavelet package, at least for now.
You may also be interested in the LTFAT package.
Contribution
There are many ways to contribute to the development and maintenance of the signal processing package, including but not limited to testing, writing new test cases, reviewing and editing documentation, creating useful demos or examples of how to use the functions in the package, fixing bugs in existing functions, improving compatibility with Matlab, and writing completely new functions.
Missing Tests
Octave functions can be written to include their own built-in self tests that work with the test function, see Tests.
Several functions in the signal package do not have exhaustive test suites or do not include any built-in self tests at all. This is a list of functions in the signal package that do not yet have any tests.
- ar_psd
- arburg
- aryule
- besselap
- bilinear
- buttap
- cceps
- cheb
- cheb1ap
- cheb2ap
- clustersegment
- cmorwavf
- cohere
- cpsd
- csd
- dct
- dct2
- dctmtx
- dftmtx
- diric
- dwt
- ellipap
- firls
- freqs
- freqs_plot
- gmonopuls
- hilbert
- idct
- idct2
- iirlp2mb
- interp
- invfreq
- invfreqs
- invfreqz
- kaiserord
- levinson
- mexihat
- meyeraux
- morlet
- movingrms
- mscohere
- ncauer
- pburg
- polystab
- primitive
- pwelch
- pyulear
- qp_kaiser
- sampled2continuous
- sawtooth
- schtrig
- sftrans
- sgolayfilt
- shanwavf
- sigmoid_train
- square
- ss2tf
- ss2zp
- tf2ss
- tf2zp
- tfe
- tfestimate
- wconv
- wkeep
- wrev
- xcorr
- xcov
- zp2ss
- zp2tf
- zplane
Missing Functions
This is a list of functions that are not yet implemented in the Octave signal package. Patches for some of these functions are available on the patch tracker and are undergoing review. You could help us by implementing the missing functions and adding them to the patch tracker, or by helping us review the ones that are already there. This list is subject to change and may not be complete in any sense. However, it is a starting point when looking for missing functionality or for possible projects to work on.
Signal Generation
- demod
- modulate (see patch #9409)
- seqperiod
- strips
- vco
Correlation and Convolution
- corrmtx
- dtw (please refer to open feature request bug #51572, only pseudocode so far)
Signal Measurement
- bandpower (see patch #8697)
- dutycycle
- enbw
- falltime
- midcross
- overshoot
- pulseperiod
- pulsesep
- pulsewidth
- risetime
- settlingtime
- sfdr
- slewrate
- statelevels (see patch #9199)
- undershoot
Filter Analysis
- filternorm
- filtord
- firtype
- impzlength
- isallpass
- islinphase
- ismaxphase
- isminphase
- isstable (see patch #9265)
- phasedelay
- phasez
- stepz (see patch #8630)
- zerophase
Filter Conversion
- cell2sos
- filt2block
- latc2tf
- latcfilt
- realizemdl
- sos2cell
- sos2ss
- ss2sos
- tf2latc
- tf2zpk
FIR Filter Design
- cfirpm
- equiripple
- fircls
- fircls1
- firpm (see patch #8535)
- firpmord (see patch #8535)
firrcos(superseded by rcosdesign)- freqsamp
- gaussfir
- intfilt
- kaiserwin
- maxflat
- polyscale
- rcosdesign
remezord(superseded by firpmord)
IIR Filter Design
- lp2bp
- lp2bs
- lp2hp
- lp2lp (please refer to open feature request bug #46440, only partial code snippets so far)
- yulewalk
Transforms
- goertzel (see patch #8495)
- icceps
Spectral Analysis
- db
- pcov
- peig
- pmcov
- pmtm (please refer to open feature request bug #55714)
- pmusic
- rooteig
- rootmusic
- spectrogram (please refer to open feature request bug #45232)
Window Functions
- dpss
- dpssclear
- dpssdir
- dpssload
- taylorwin (see patch #8506)
System Identification
- ac2poly
- ac2rc
- arcov
- armcov
- is2rc
- lar2rc
- lpc (see patch #8575)
- lsf2poly (see patch #8726)
- poly2ac
- poly2lsf (see patch #8726)
- poly2rc
- prony
- rc2ac
- rc2is
- rc2lar
- rc2poly
- rlevinson
- schurrc
- stmcb
Object Oriented Filter Design
- design
- designmethods
- designopts
- fdesign
- fdesign.arbmag
- fdesign.bandpass
- fdesign.bandstop
- fdesign.differentiator
- fdesign.highpass
- fdesign.hilbert
- fdesign.lowpass
- fdesign.pulseshaping
- setspecs
- validstructures
Interactive Design Tools
- dspfwiz
- fdatool
- filterbuilder
- sptool
- wintool
- wvtool