Functions
init variable compute	d (tau) x1

	d2 (1+lag)

	if (length(mloc)>0) I

	if (length(I)>0) candf0lag

candf0lag-1	d2 ()

id	f0lag ()

compute candidate frequency in Hz	if (ac > 0.2)%voiced/unvoiced threshold f0=0

Variables
function	f0

function	fs

function	ws

function	minf0

function	maxf0

maximum lag	th = 0.1

set threshold	d = zeros(maxlag,1)

init variable	d2 = zeros(maxlag,1)

	cumsumx = sum(x1.^2)

	cumsumxl = cumsumx

	xy = xcorr(x(1:ws*2),x1)

for	lag

end	cumsum = 0

end limit the search to the target range	minf0lag = 1+round(fs./minf0)

compute lag corresponding to minf0	maxf0lag = 1+round(fs./maxf0)

compute lag corresponding to maxf0 if(maxf0lag >1 &&maxf0lag< maxlag) d2(1 avoid lags shorter than maxf0lag end if(minf0lag >1 &&minf0lag< maxlag) d2(minf0lag avoid lags larger than minf0lag end find the best candidate	mloc = 1 + find((d2(2:end-1)<d2(3:end)).*(d2(2:end-1)<d2(1:end-2)))

minima	candf0lag = 0

	else [Y, I2] = min(d2(mloc))

	val = d2(candf0lag)

	rval = d2(candf0lag+1)

end end	ac = min(d2)

	f0lag = candf0lag-1

Function Documentation

init variable compute d ( tau )

d2 ( 1+ lag )

candf0lag-1 d2 ( )

virtual

id f0lag ( )

virtual

if	(	length(mloc)	,
		0
	)

if	(	length(I)	,
		0
	)

compute candidate frequency in Hz if	(	ac	,
		0.	2
	)

pure virtual

Variable Documentation

end end ac = min(d2)

Definition at line 54 of file f0detectionyin.m.

candf0lag = 0

Definition at line 36 of file f0detectionyin.m.

end cumsum = 0

Definition at line 18 of file f0detectionyin.m.

cumsumx = sum(x1.^2)

Definition at line 10 of file f0detectionyin.m.

cumsumxl = cumsumx

Definition at line 11 of file f0detectionyin.m.

set threshold d = zeros(maxlag,1)

Definition at line 6 of file f0detectionyin.m.

init variable d2 = zeros(maxlag,1)

Definition at line 7 of file f0detectionyin.m.

else[Y, I2] = min(d2(mloc))

Definition at line 42 of file f0detectionyin.m.

function f0

Initial value:

= f0detectionyin(x,fs,ws,minf0,maxf0)

% x: input signal

fs

function fs

Definition: f0detectionyin.m:1

x

Discrete Time axis x

Definition: FFT of a Simple Sinusoid.m:10

ws

function ws

Definition: f0detectionyin.m:1

input

these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame This method is called when a frame is wanted on an output For an input

Definition: filter_design.txt:216

maxf0

function maxf0

Definition: f0detectionyin.m:1

minf0

function minf0

Definition: f0detectionyin.m:1

Definition at line 1 of file f0detectionyin.m.

f0lag = candf0lag-1

Definition at line 55 of file f0detectionyin.m.

function fs

Definition at line 1 of file f0detectionyin.m.

for lag

Initial value:

=0:maxlag-1

d(1+lag) = cumsumx + cumsumxl - 2*xy(1+lag)

cumsumx

Definition: f0detectionyin.m:10

cumsumxl

Definition: f0detectionyin.m:11

d

set threshold d

Definition: f0detectionyin.m:6

xy

Definition: f0detectionyin.m:12

lag

for lag

Definition: f0detectionyin.m:14

Definition at line 14 of file f0detectionyin.m.

function maxf0

Definition at line 1 of file f0detectionyin.m.

compute lag corresponding to minf0 maxf0lag = 1+round(fs./maxf0)

Definition at line 27 of file f0detectionyin.m.

function minf0

Definition at line 1 of file f0detectionyin.m.

end limit the search to the target range minf0lag = 1+round(fs./minf0)

Definition at line 26 of file f0detectionyin.m.

compute lag corresponding to maxf0 if (maxf0lag>1 && maxf0lag<maxlag) d2(1 avoid lags shorter than maxf0lag end if (minf0lag>1 && minf0lag<maxlag) d2(minf0lag avoid lags larger than minf0lag end find the best candidate mloc = 1 + find((d2(2:end-1)<d2(3:end)).*(d2(2:end-1)<d2(1:end-2)))

Definition at line 35 of file f0detectionyin.m.

rval = d2(candf0lag+1)

Definition at line 50 of file f0detectionyin.m.

maximum lag th = 0.1

Definition at line 5 of file f0detectionyin.m.

val = d2(candf0lag)

Definition at line 49 of file f0detectionyin.m.

function ws

Definition at line 1 of file f0detectionyin.m.

xy = xcorr(x(1:ws*2),x1)

Definition at line 12 of file f0detectionyin.m.

Paris Hackday Code

Functions

Variables

Function Documentation

Variable Documentation