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% Parameter analysis for the Harmonic Model + Phase Distortion (HMPD)
%
% Octave compatible
%
% This the main entry point for estimating the parameters of the HMPD vocoder.
%
% Please read the README.txt file for general information about HMPD before
% using it.
%
% Inputs
% wav : The samples of the waveform to analyse
% fs : [Hz] The sampling rate of the waveform
% [f0s] : [s, Hz] [Mx2] A time/data column vector with time instants t[s] and
% fundamental frequency f0[Hz] estimated at each time t.
% It can be empty. In this case, it will be estimated by the SRH method
% provided in COVAREP.
% WARNING: Even if you do not provide your own f0 curve, it is still
% important to adapt the f0min and f0max values in the options
% according to the analysized voice!
% It is very likely that the output features will not be estimated
% at the time instants t. They will be given at regular time instants
% (see option opt.regularstepsize), regardless the f0s argument.
% [opt] : Additional options (see code below)
% Even though this argument is optional, it is highly recommended to
% adapt the f0min and f0max options if no f0s argument is provided.
%
% Outputs
% f0s : [s, Hz] [Nx2] A time/data column vector, as above, containing the
% used fundamental frequency curve.
% AE : [NxD] A matrix containing the amplitude envelope.
% D is either opt.dftlen/2+1 (from hmpd_features_compute.m), or
% opt.amp_order+1, depending if compression is disabled or enabled.
% PDM : [NxD] A matrix containing the Phase Distortion Mean.
% D is either opt.dftlen/2+1 or opt.pdm_order+1, depending if
% compression is disabled or enabled.
% PDD : [NxD] A matrix containing the Phase Distortion Deviation.
% D is either opt.dftlen/2+1 or opt.pdd_order+1, depending if
% compression is disabled or enabled.
% opt : The options used for the analysis.
%
% Copyright (c) 2012 University of Crete - Computer Science Department (UOC-CSD)
%
% License
% This file is under the LGPL license, you can
% redistribute it and/or modify it under the terms of the GNU Lesser General
% Public License as published by the Free Software Foundation, either version 3
% of the License, or (at your option) any later version. This file is
% distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
% without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
% PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
% details.
%
% This function is part of the Covarep project: http://covarep.github.io/covarep
%
% Author
% Gilles Degottex <degottex@csd.uoc.gr>
%
function [f0s, AE, PDM, PDD, opt] = hmpd_analysis(wav, fs, f0s, opt)
if nargin<4
% Options for the f0 estimation
% (used only if f0s not provided in argument)
opt.f0min = 60;
opt.f0max = 440;
opt.f0refine = false;
% Options for the harmonic analysis
opt.highpass = []; % High-pass the signal before sinusoidal analysis
opt.sin = sin_analysis();
opt.sin.use_f0time = true; % Use the times adapted to f0 curve.
opt.sin.fharmonic = true; % Force strict harmonicity
opt.sin.use_ls = true; % By default, use Least Square (LS) solution
opt.sin.fadapted = true; % and adapt the frequency basis to f0 curve
opt.sin.debug = 0; % Do not print anything while running
% features computation
opt.sin_nbat = 4; % Number of analysis instant per period
opt.dftlen = 1024; % Used DFT length (e.g. for uncompressed features)
opt.regularstepsize = 0.005;% [s] step size for features resampling
% Amplitude
opt.amp_enc_method = 1; % 1:envelope; % 2:cepstral
opt.amp_f0norm = true;
opt.amp_log = false;
opt.amp_order = opt.dftlen/2; % 24mfcc smells for 32kHz, 32 good
opt.amp_logfn = @frq2mel;
opt.amp_def = -300; % [dB] def value that replaces zero values
opt.pd_vtf_rm = true; % Remove the VTF phase from the phase measurement
% Phase
opt.dc_phase = 0; % keep ori. phase if empty; otherwise, set to value
opt.polarity_inv = false; % (applied after dc_phase is set)
opt.pdm_nbper = 6; % Number of period to consider for PDM
opt.pdm_log = false; % If true, compress the phase coefficients using
% a log scale on a harmonic scale
opt.pdm_log_hb = 8; % Below this harmonic limit, the scale is linear
% Then it is logarithmic (similar to the mel scale)
opt.pdm_order = opt.dftlen/2;% PDM's order for compression
opt.pdd_nbper = 2; % Number of period to consider for PDD
opt.pdd_log = false; % lin&log scale (kind of a mel scale)
opt.pdd_order = opt.dftlen/2; % PDD's order for compression
% Misc
opt.usemex = false; % Use mex fn, faster but use linear interpolation
opt.debug = 1;
end
if nargin==0; f0s=opt; return; end
if nargin<3; f0s=[]; end
if opt.amp_enc_method==1; opt.amp_order=opt.dftlen/2; end
if exist('OCTAVE_VERSION'); opt.usemex=false; end
% Estimate sinusoidal harmonic parameters
frames = hmpd_analysis_harmonic(wav, fs, f0s, opt);
% Compute amplitude envelope and phase statistics
[f0s, AE, PDM, PDD] = hmpd_analysis_features(frames, fs, opt);
return