HW 13b - Revision history

Fonggr: /* Adaptive Filter */

2008-12-18T00:02:34Z

Adaptive Filter

← Older revision		Revision as of 17:02, 17 December 2008
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	===Adaptive Filter===		===Adaptive Filter===
	~~<code>~~
	~~% LMS algorithm for adaptive noise cancellation~~
	~~h = zeros(N,1);~~
	~~mu = 1/(10Nvar(n));~~
	~~%mu = 1.0;~~
	~~for k=N:Ls~~
	~~xk = n(k:-1:(k-N+1));~~
	~~nhat(k) = h'*xk';~~

	e(k) = - y(k) + nhat(k);		Ls = length(Noise2); % Noise & SignalNoise is an Ls by 1 matrix.
	h = h - mue(k)xk';		N = 20; % Length of adaptive filter
	%/(xk'*xk); % ~~For the previous line.~~		h = zeros(N,1); % Adaptive filter coefficients
	end		mu = 1/(1000Nvar(Noise2)); % Need to change
	~~</code>~~		for k=N:Ls % Offset by the length of the adaptive filter to "start up"
			xk = Noise2(k:-1:(k-N+1)); % Flip shift
			nhat(k) = (h')*(xk'); % Multiply integrate
			e(k) = - SignalNoise(k) + nhat(k); % Error term
			h = h - mue(k)xk'/(xk*xk'); % Dividing by D^2 makes it independant of mu
			end

	====Questions====		====Questions====

2008-12-12T06:08:45Z

Questions

← Older revision		Revision as of 23:08, 11 December 2008
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	*Is h the adaptive filter coefficients? Yes!		*Is h the adaptive filter coefficients? Yes!
	*When you save the voice, is it an Nx1 or 1xN matrix?		*When you save the voice, is it an Nx1 or 1xN matrix?
	*~~Whos~~ (octave) will show all variables and their dimensions		*whos (octave) will show all variables and their dimensions

	===Possibly promising links===		===Possibly promising links===

2008-12-12T05:47:53Z

Adaptive Filter

← Older revision		Revision as of 22:47, 11 December 2008
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	===Adaptive Filter===		===Adaptive Filter===
			<code>
	% LMS algorithm for adaptive noise cancellation		% LMS algorithm for adaptive noise cancellation

	h = zeros(N,1);		h = zeros(N,1);
	mu = 1/(10Nvar(n));		mu = 1/(10Nvar(n));
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	%/(xk'*xk); % For the previous line.		%/(xk'*xk); % For the previous line.
	end		end
			</code>

	====Questions====		====Questions====

2008-12-12T05:40:19Z

Adaptive Filter

← Older revision		Revision as of 22:40, 11 December 2008
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	====Questions====		====Questions====
	*Is h the adaptive filter coefficients?		*Is h the adaptive filter coefficients? Yes!
	*When you save the voice, is it an Nx1 or 1xN matrix?		*When you save the voice, is it an Nx1 or 1xN matrix?
			*Whos (octave) will show all variables and their dimensions

	===Possibly promising links===		===Possibly promising links===

2008-12-12T05:23:23Z

Octave Help

@@ Line 23: / Line 23: @@
 ===Octave Help===
 [http://wiki.aims.ac.za/mediawiki/index.php/Octave Octave Wiki]
 ===Possibly promising links===

2008-12-12T04:50:06Z

SSB Demodulation

← Older revision		Revision as of 21:50, 11 December 2008
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	*Low pass filter to single out the signal at the baseband (and to throw out the signal at +/- 2f)		*Low pass filter to single out the signal at the baseband (and to throw out the signal at +/- 2f)
	*Use your favorite sink to hear/see the results		*Use your favorite sink to hear/see the results

			===Octave Help===
			[http://wiki.aims.ac.za/mediawiki/index.php/Octave Octave Wiki]

	===Possibly promising links===		===Possibly promising links===

2008-12-11T07:28:32Z

Possibly promising links

← Older revision		Revision as of 00:28, 11 December 2008
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	[http://gnuradio.org/trac/wiki/Octave Using GNU Radio with Octave]		[http://gnuradio.org/trac/wiki/Octave Using GNU Radio with Octave]

			[https://www.cgran.org/wiki/DttSP DttSP + GNU Radio]

2008-12-11T01:43:13Z

Possibly promising links

← Older revision		Revision as of 18:43, 10 December 2008
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	===Possibly promising links===		===Possibly promising links===
	[http://gnuradio.org/doc/doxygen/group__filter.html dOxygen filters]		[http://gnuradio.org/doc/doxygen/group__filter.html dOxygen filters]

	[http://gnuradio.org/trac/wiki/Octave Using GNU Radio with Octave]		[http://gnuradio.org/trac/wiki/Octave Using GNU Radio with Octave]

2008-12-11T01:43:06Z

Possibly promising links

← Older revision		Revision as of 18:43, 10 December 2008
Line 23:		Line 23:
	===Possibly promising links===		===Possibly promising links===
	[http://gnuradio.org/doc/doxygen/group__filter.html dOxygen filters]		[http://gnuradio.org/doc/doxygen/group__filter.html dOxygen filters]
			[http://gnuradio.org/trac/wiki/Octave Using GNU Radio with Octave]

2008-12-11T00:58:36Z

← Older revision		Revision as of 17:58, 10 December 2008
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	===Possibly promising links===		===Possibly promising links===
	[http://gnuradio.org/doc/doxygen/group__filter.html dOxygen filters]		[http://gnuradio.org/doc/doxygen/group__filter.html dOxygen filters]

	~~===Questions===~~
	*What is dOxygen
	*How to incorporate filters into GNU Radio/Companion