higrid package¶

higrid consists of the following modules:

Microphone module¶

Microphone class that is to be expanded in the future versions of the package.

class Microphone.EigenmikeEM32¶

Bases: Microphone.MicrophoneArray

Eigenmike em32 class that inherits from the MicrophoneArray class.

returnAsStruct()¶

Returns the attributes of the Eigenmike em32 as a struct

Returns:	dict object with the name, type, thetas, phis, radius, weights, version, numelements, directivity, info fields

class Microphone.Microphone(name='Generic', version='1.0', direct='Omnidirectional')¶

Bases: object

Microphone class

getname()¶

Getter for the name

Returns:	Name (str) of the microphone object

getversion()¶

Getter for the version

Returns:	Version (str) of the microphone object

setname(name)¶

Setter for the name attribute

Parameters:	name – Name of the microphone (str)

setversion(version)¶

Setter for the version attribute

Parameters:	name – Version of the microphone (str)

class Microphone.MicrophoneArray(name, typ, version, direct)¶

Bases: Microphone.Microphone

MicrophoneArray Class that inherits from the Microphone class

gettype()¶

Getter for array type

Returns:	Type of the array (str)

settype(typ)¶

Setter for array type

Parameters:	typ – Type of the array (str)

TreeClusteri module¶

Submodule containing functions used in clustering multiresolution SRPD maps

TreeClusteri.hpneighbouridx(level, idx)¶

Neighbours of a Healpix pixel (in nested format)

Parameters:	level – Resolution level idx – Index of the Healpix pixel
Returns:	Neighbouring nodes of the pixel

TreeClusteri.neighboursofset(cset)¶: Return all the neighbours of a set of Healpix pixels (in nested format) :param cset: :return:

TreeClusteri.preprocess(trr, tLevel)¶

Eliminate leaf nodes that are below the mean

Parameters:	trr – Healpix tree (as a defaultdict) tLevel – Level at which the leaf nodes are
Returns:	Tree as a defaultdict after mean thresholding

TreeClusteri.treeCluster(trr, tLevel)¶

Neighbouring Nodes Labelling (NNL) for clustering pixels

Parameters:	trr – Healpix tree (as a defaultdict) tLevel – Level at which the leaf nodes are
Returns:	Healpix pixel clusters that belong to a single source

Treei module¶

Tree selection based on spatial entropy

dpd module¶

Submodule including functions used for the direct path dominance (DPD) test

emulate module¶

Submodule used for creating emulated recordings using acoustic impulse responses

emulate.combinescene(sg1, sg2)¶

Linearly combines two scenes pertaining to em32 recordings

Parameters:	sg1 – Scene 1 (32 x samples numpy array) sg2 – Scene 2 (32 x samples numpy array)
Returns:	Combined scene (32 x samples numpy array)

emulate.composescene(filelist, dirset, samples=(0, 96000), roomstr='ii-s05')¶

Compose an emulated scene using a number of anechoic sound signals and measured AIRs

Parameters:	filelist – List of files to be used dirset – Set containing tuples with (X, Y, Z) as the AIR indices samples – Start and end points of samples to be prococessed as a tuple (sstart, send) roomstr – Used to select from a specific directory (default is ‘ii-s05’ as we only provided AIRs for that room)
Returns:	32 channels of audio from an emulated em32 recording.

emulate.emptyscene(sha=(32, 48000))¶

Returns an empty scene

Parameters:	sha – Tuple containing number of channels and number of samples (nchan, samples) (default = (32, 48000))
Returns:	An empty scene containing nchan channels and the given number of samples (empty numpy array)

emulate.emulatescene(insig, gain, irspath)¶

Emulates a scene by convolving a source input signal with em32 AIRs

Parameters:	insig – (Single-channel) input signal gain – Gain (scalar) irspath – Path to the AIRs to be used
Returns:	32 channels of audio from an emulated em32 recording.

emulate.realrec(dirpath, prefix, samples)¶

Create a scene from real em32 recordings

Parameters:	dirpath – Path containing the em32 recordings prefix – samples – Number of samples to use
Returns:	32 channel em32 recording

higridestimate module¶

Main submodule that includes functions used in DOA estimation with the HiGRID algorithm

shd module¶

Submodule that includes functions related to spherical harmonic decomposition (SHD)

testpos3d module¶

Submodule for selecting emulated source positions

testpos3d.angle(tupl1, tupl2, mtupl)¶

Returns the angle between two vectors

Parameters:	tupl1 – Tuple containing the coordinates of a point tupl2 – Tuple containing the coordinates of another point mtupl – Tuple containing the coordinates of origin
Returns:	Angle between the two vectors (in radians)

testpos3d.histclust(drrmat, dind, N, numthr)¶

Returns a number of clusters of sources positions based on their D/R ratios

Parameters:	drrmat – Matrix containing coordinates of source oposition on the grid and its D/R ratio dind – Histogram bin to choose N – Number of bins to use numthr – At least this many sources in a given bin has to be present
Returns:

testpos3d.measgrid()¶

Returns the measurement positions and DRR values for emulations

Returns:	Defaultdict containing tuple (xindex, yindex, zindex) as keys and DRR as values

testpos3d.select(grd, n=4, dind=3, dclust=8, thcond=<MagicMock name='mock.__truediv__()' id='139952313190496'>)¶

Returns a single test scene instance

Parameters:	grd – Measurement grid from measgrid() n – Number of sources to choose (default = 4) dind – Cluster index (default = 3) dclust – Number of bins to use in histogram for D/R ratio clustering (default = 8) thcond – Minimum angle between consecutive sources (in radians) (default = pi/4)
Returns:	One test instance and the average D/R ratio at the selected positions

testpos3d.selectset(grd, n=4, dind=3, dclust=8, thcond=<MagicMock name='mock.__truediv__()' id='139952313289248'>, trialcount=1)¶

Returns a number of test scene instances with similar D/R ratio and a prescribed minimum angle between them

Parameters:	grd – Measurement grid from measgrid() n – Number of sources to choose (default = 4) dind – Cluster index (default = 3) dclust – Number of bins to use in histogram for D/R ratio clustering (default = 8) thcond – Minimum angle between consecutive sources (in radians) (default = pi/4) trialcount – Number of randomly selected scenes (default = 1)
Returns:	List containing trialcount number of test instances and the average D/R ratio at the selected positions

testpos3d.vdist(a, b)¶

Returns the angle between two vectors

Parameters:	a – Vector 1 b – Vector 2
Returns:	Normalised angle [-1,+1] between the two vectors

treeutils module¶

Submodule including some utility functions for manipulating tree representation

treeutils.children(level, idx)¶

Return all the children of the Healpix pixel idx at level (in nested format)

Parameters:	level – Resolution level idx – Pixel index
Returns:	All the parents of the pixel

treeutils.parent(level, idx)¶

Return the parent of a given healpix pixel (in nested format)

Parameters:	level – Resolution level idx – Index at the given level
Returns:	Tuple (lvl, idp) including the level and the index of the parent pixel

treeutils.parents(level, idx)¶

Return all the (grand-)parents of the Healpix pixel idx at level (in nested format)

Parameters:	level – Resolution level idx – Pixel index
Returns:	All the parents of the pixel

treeutils.siblings(level, idx)¶

Return the siblings of the Healpix pixel idx at level (in nested format)

Parameters:	level – Resolution level idx – Pixel index
Returns:	Return the siblings of the pixel

utils module¶

Submodule including some general utility functions

utils.cart2sph(x, y, z)¶

r, th, ph = cart2sph(x, y, z)

Return the spherical coordinate representation of point(s) given in Cartesian coordinates

As usual r is the radius, th is the elevation angle defined from the positive z axis and ph is the azimuth angle defined from the positive x axis

utils.fulltree(tLevel=3, val=0)¶

Create a defaultdict containing all the pixels in a healpix grid, initialised with the default value

Parameters:	tLevel – Healpix resolution level (default = 3) val – Value of each pixel (default = 0)
Returns:	defaultdict containing all the pixels in the healpix grid at the given resolution

utils.histtotree(H, the, phe, tLevel)¶

Convert 2D DOA histogram to a healpix tree representation

Parameters:	H – 2D DOA histogram matrix the – Array of azimuth angles corresponding to columns of the 2D histogram matrix phe – Array of inclination angles corresponding to columns of the 2D histogram matrix tLevel – Healpix resolution level (default = 3)
Returns:	defaultdict containing healpix grid st the given resolution containing the 2D histogram

utils.loadpixbasis()¶

Returns the

Returns:

utils.node2vec(level, idx)¶

Converts the centre direction of a Healpix pixel to a unit vector

Parameters:	level – Resolution level idx – Index of the pixel
Returns:	3x1 array containing the unit vector

utils.processirs(irs, monosnd)¶

Returns an emulated recording of em32 using acoustic impulse responses and an anechoic sound signal

Parameters:	irs – Acoustic impulse responses obtained using em32 monosnd – Monophonic sound signal to be convolved with the AIRs
Returns:	32-channels emulated recording of em32 as a numpy array

utils.selectbinindx(fidx, tidx, Pnm, Ndec=4)¶

Returns the SHD vectors of a given time-frequency bin

Parameters:	fidx – Frequency index tidx – Time index Pnm – List of SHD-STFT matrices Ndec – SHD order (default = 4)
Returns:	SHD vector, SHD order

utils.selectsome(idx, idy, maxnum)¶

Randomly selects a given number of time-frequency bins

Parameters:	idx – List containing frequency indices of selected bins idy – List containing time indices of selected bins maxnum – Maximum number of bins to select (in None, return all indices)
Returns:

utils.sph2cart(r, th, ph)¶

Converts vector in spherical coordinates to Cartesian coordinates

Parameters:	r – Radius th – Azimuth angle ph – Inclination angle
Returns:	Vector in Cartesian coordinates

utils.sph_jnyn(N, kr)¶

Returns spherical Bessel functions of the first (jn) and second kind (yn) and their derivatives

Parameters:	N – Function order kr – Argument
Returns:	jn, jn’, yn, yn’

NOTE: Emulates the behaviour of sph_jnyn() in early versions of scipy (< 1.0.0).

utils.wavread(wave_file)¶

Returns the contents of a wave file

Parameters:	wave_file – Path to the wave_file to be read
Returns:	(signal, sampling rate, number of channels)

NOTE: Wavread solution was adapted from https://bit.ly/2Ubs9Jp