yading@10: function y = sinemodel(x, w, N, t)
yading@10: % Analysis/synthesis of a sound using the sinusoidal model
yading@10: % x: input sound, w: analysis window (odd size), N: FFT size,
yading@10: % t: threshold in negative dB, y: output sound
yading@10: M = length(w); % analysis window size
yading@10: Ns= 1024; % FFT size for synthesis (even)
yading@10: H = 256; % analysis/synthesishop size
yading@10: N2= N/2+1; % size of positive spectrum
yading@10: soundlength = length(x); % length of input sound array
yading@10: hNs = Ns/2; % half synthesis window size
yading@10: hM = (M-1)/2; % half analysis window size
yading@10: pin = max(N2,1+hM); % initialize sound pointer to middle of analysis window
yading@10: pend = soundlength-max(N2,hM); % last sample to start a frame
yading@10: fftbuffer = zeros(N,1); % initialize buffer for FFT
yading@10: y = zeros(soundlength,1); % initialize output array
yading@10: w = w/sum(w); % normalize analysis window
yading@10: sw = zeros(Ns,1);
yading@10: ow = triang(2*H-1); % overlapping window (triangular window to avoid too much overlapping)
yading@10: ovidx = Ns/2+1-H+1:Ns/2+H; % overlap indexes
yading@10: sw(ovidx) = ow(1:2*H-1);
yading@10: bh = blackmanharris(Ns); % synthesis window
yading@10: bh = bh ./ sum(bh); % normalize synthesis window
yading@10: sw(ovidx) = sw(ovidx) ./ bh(ovidx);
yading@10: while pin<pend
yading@10: %-----analysis-----%
yading@10: xw = x(pin-hM:pin+hM).*w(1:M); % window the input sound
yading@10: %zero phased window
yading@10: fftbuffer(:)=0;
yading@10: fftbuffer(1:(M+1)/2) = xw((M+1)/2:M); % zero-phase window in fftbuffer
yading@10: fftbuffer(N-(M-1)/2+1:N) = xw(1:(M-1)/2);
yading@10: 
yading@10: X = fft(fftbuffer); % compute the FFT
yading@10: mX = 20*log10(abs(X(1:N2))); % magnitude spectrum of positive frequencies
yading@10: pX = unwrap(angle(X(1:N/2+1))); % unwrapped phase spectrum
yading@10: ploc = 1 + find((mX(2:N2-1)>t) .* (mX(2:N2-1)>mX(3:N2)).* (mX(2:N2-1)>mX(1:N2-2))); % find peaks
yading@10: [ploc,pmag,pphase] = peakinterp(mX,pX,ploc); % refine peak values
yading@10: %-----synthesis-----%
yading@10: plocs = (ploc-1)*Ns/N+1; % adapt peak locations to synthesis FFT
yading@10: Y = genspecsines(plocs,pmag,pphase,Ns); % generate spec sines
yading@10: yw = fftshift(real(ifft(Y))); % time domain of sinusoids
yading@10: y(pin-hNs:pin+hNs-1) = y(pin-hNs:pin+hNs-1) + sw.*yw(1:Ns); % overlap-add
yading@10: pin = pin+H; % advance the sound pointer
yading@10: end