samer@1: classdef sigempty < sigbase
samer@1: 	methods
samer@1: 		function s=sigempty(channels,rate)
samer@1: 			if nargin<2, rate=nan; end
samer@1: 			s=s@sigbase(channels,rate);
samer@1: 		end
samer@1: 
samer@1: 		function s=tostring(sig), s='sigempty'; end
samer@1: 		function s=construct(sig)
samer@1: 			s.start   = @nop;
samer@1: 			s.stop    = @nop;
samer@1: 			s.dispose = @nop;
samer@1: 			s.reader = @reader;
samer@1: 
samer@1: 			function r=reader(n)
samer@1: 				r = @next;
samer@1: 				buf=zeros(sig.channels,double(n));
samer@1: 				function [x,rem]=next, x=buf; rem=n; end
samer@1: 			end
samer@1: 		end
samer@1: 	end
samer@1: end