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1.ËÑË÷ÐźÅÖ÷º¯Êý£º

function SignalSearch(Obj,handles)

%ËÑË÷Ðźź¯Êý

lowlim=str2double(get(handles.edit_f1,'String'));

gdbase=str2double(get(handles.edit_gdbase,'String'));

err=str2double(get(handles.edit_err,'String'));

ishand=get(handles.checkbox_hand,'Value');

index=get(handles.datalist,'Value');

if(index<1)

return

end

data=Obj.DM.datas{index};

autocut=get(handles.checkbox_autocut,'Value');

[signaldata cut]=Obj.test1(data,lowlim,autocut,ishand,gdbase,err);

Obj.DM.signaldatas{index}=signaldata;

Obj.DM.cuts{index}=cut;

return

2.ËÑË÷ÐźÅÖ÷º¯ÊýÖе÷ÓõÄtest1º¯Êý£¬ÓÃÀ´²éÕÒÐźźͽµÔë

function [signals num]=findsignal(data2,base,d,lowlim,start,num)%¶ÔÒ»¸öÊý¾Ý¶ÎÑ°ÕÒÐźŵĺ¯Êý

data=data2(:,2);

c_signals=find(data<(base-d));%ËùÓÐÒÉËÆÐźŵãµÄλÖõÄÊý×é

if(isempty(c_signals))

signals=[];

return

end

len=length(data);

signals_place=find(c_signals(2:end)-c_signals(1:end-1)>1);

d_signals=[[1;signals_place+1] [signals_place;length(c_signals)]];% ÒÔ×óÓÒÁ½¶ËµÄÐÎʽ½«ÒÉËÆÐźŷÅÈën*2Êý×é

e_signals=c_signals(d_signals);

if(length(e_signals)==2)

e_signals=e_signals';

end

f_signals=[e_signals(:,1)*2-e_signals(:,2) e_signals(:,2)*2-e_signals(:,1)];% ¼ì²âµç´ÅÐźŵķ¶Î§£ºÇ°ºóÓëÐźų¤¶ÈÏàͬµÄ³¤¶È·¶Î§f_signals(f_signals<1)=1;

f_signals(f_signals>len)=len;%È¥³ýÎÞЧֵ

g_signals=[e_signals(:,1)-10 e_signals(:,2)+10];%ÓÃÓÚÑ°ÕÒÁ½¶ËµÄ·¶Î§

g_signals(g_signals<1)=1;

g_signals(g_signals>len)=len;%È¥³ýÎÞЧֵ

signals=[];

i=1;

while(i<=size(e_signals,1))

minpoint=base-min(data(e_signals(i,1):e_signals(i,2)));

bdata=data(f_signals(i,1):f_signals(i,2));

maxpoint=max(bdata)-base;

if(maxpoint>minpoint)%¸ù¾ÝÊÇ·ñº¬Óеç´Å¸ÉÈÅɸѡ

e_signals(i,:)=[];

f_signals(i,:)=[];

g_signals(i,:)=[];

else

if(g_signals(i,2)<40||g_signals(i,1)>length(data)-40)

e_signals(i,:)=[];

f_signals(i,:)=[];

g_signals(i,:)=[];

else

bddata=data(g_signals(i,1):g_signals(i,2));

diffdata=[0;diff(bddata)];

e_signals(i,1)=g_signals(i,1)-1+find(diffdata<=0.27*min(diffdata),1);

temp=find(diffdata>=0.25*max(diffdata));

e_signals(i,2)=g_signals(i,1)-1+temp(end);

num=num+1;

if(e_signals(i,2)

temp=e_signals(i,2);

e_signals(i,2)=e_signals(i,1);

e_signals(i,1)=temp;

end

signals{i}=SignalAnalysis(data2,e_signals(i,:),start,num);

i=i+1;

end

end

end

end

²Î¿¼ÎÄÏ×£º

1. ºú¹ãÊé. Êý×ÖÐźŴ¦Àí[M]. ±±¾©:Ç廪´óѧ³ö°æÉç, 2003. 1-3

2. ¶¡¿Ë¼ó, Õź£Ñà, ºúºì¸Õ, ÕÔºìÃô, ¹Øΰ¾ü, ÂíÔ»Ô. ÉúÎï´ó·Ö×ÓÄÉÃ׿׷ÖÎö¼¼ÊõÑо¿½øÕ¹[C]. ±±¾©:·ÖÎö»¯Ñ§, 2010. 280-285

3. Jacob, K, Rosenstein, Meni, Wanunu, Christopher, A, Merchant, Marija, Drndic, Kenneth, L, Shepard. Integrated nanopore sensing platform with sub-microsecond temporal resolution[C]. New York, USA:nature methods, 2012. 487-487

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¹Ø¼ü×Ö£ºÊý×ÖÐźŴ¦Àí FTÓëDFT MATLAB

Abstract:Along with the rapid development of information science and computer technology, digital signal processing has exploded in recent years and it is becoming an extremely important subject. This article discusses the applications of the soft ware MATLAB in digital signal processing, and describes how to make it simple and straight for the complicated computations and abstract problems.

Key Words:Digital signal processing

FT and DFT MATLAB

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