function?ab（speichernwgMpauswahlhandles）
warning（‘off‘‘MATLAB:dispatcher:InexactCaseMatch‘）%（modified?2008）
%?Abw鋜tstastung?eines?Tiefpa?Signals
%
%?Inhalt:
%?-------
%?Abw鋜tstastung?wenn?eingegebene?Grenzfrequenz
%?kleiner?als?wg/M?ansonsten?Dezimation.
%?Achtung:?Das?hei遲?nicht?da?wir?in?Realit鋞?
%?je?nach?Signal?wahlweise?abw鋜tstasten?oder?
%?dezimieren?k鰊nen!!!
%
%?Ziel:?
%?-----
%?Zeigen?der?Auswirkung?von?Aliasing
%
%?L鰏ung:
%?-------
%?Anti-Aliasing?Filter?=>?Dezimation
%
%?Variablen:
%?----------
%?p??????Phasenversatz
%?M??????Dezimationsfaktor?
%?wg?????Grenzfrequenz?des?Tiefpass-Signals
%?
%?Funktionsaufruf:?z.?B.?abwaertstastung（0.15*pi4）

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%?Berechnung?des?bandbegrenzten?Signals
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%?Der?erste?Aufruf?mit?zwei?Parametern?bewirkt?die?Initialisierung
%?der?graphischen?Oberflaeche.
%?Wird?kein?Parameter?uebergeben?so?werden?zusaetzlich?wg?und?M?gesetzt.
%?Bei?jedem?weiteren?Aufruf?die?Parameter?nicht?mehr?setzen

if?nargin<4
????wg?=?0.15*pi;
????M?=?4;
????p?=?0;
????auswahl?=?1;
elseif?nargin<5
????auswahl?=?1;
end;

%?Graphische?Oberflaeche?initialisieren
%?und?uebergebene?Werte?in?GUI-Felder?eintragen
if?nargin<6
????ab_gui;
????handles?=?guihandles（ab_gui）;
????%?Systembild?plotten
????axes（handles.system）;
????image（imread（‘a(chǎn)b_graph.png‘））;?
????axis（[0?900?0?700]）;
????axis?off;
????speichern?=?0;
end;
set（handles.wg‘Value‘wg./pi）;
set（handles.wgtext‘String‘[num2str（wg./pi）]）;
set（handles.M‘Value‘M）;
set（handles.Mtext‘String‘M）;
set（handles.ptext‘String‘p）;

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%?Ueberpruefung?auf?Aliasing
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
if?（pi/M????set（handles.text‘String‘‘WARNUNG:?Aliasing‘）;
end;

%?Signal?ist?die?Impulsantwort?eines?Tiefpasses?
%?mit?der?Grenzfrequenz?wg?und?der?Filterlaenge?N
N=70;??????????????????????????%?Filterlaenge?

%?Entwurf?mit?Remez
Fre=[0?wg/pi-0.05?wg/pi?1];????%?Frequenz?[0?pi]->[0?1]
Mag=[1?1?0?0];?????????????????%?Amplitude
x=remez（N-1FreMag）;??????????%?Entwurf?mit?Remezverfahren

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%?Abtastung?mit?Dezimationsfaktor?4
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
x0=zeros（1N+p）;
x0（p+1:M:length（x））?=?x（p+1:M:length（x））;

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%?Abw鋜tstastung?
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
y?=?x（p+1:M:length（x））;

switch?（auswahl）
????case?1
????????%?Plotten?des?Signals?und?dessen?Spektrum
????????if?speichern
????????????figure（10）;
????????????subplot（211）;
????????????zeichne

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2008-11-29?00:29??Multiratensysteme_MATLAB（Chinese?Version）\
?????文件???????55286??2002-10-16?16:14??Multiratensysteme_MATLAB（Chinese?Version）\AAU.png
?????文件????????7689??2008-10-02?03:23??Multiratensysteme_MATLAB（Chinese?Version）\ab.m
?????文件???????15403??2008-10-02?03:23??Multiratensysteme_MATLAB（Chinese?Version）\ab_band.m
?????文件???????20824??2008-09-22?07:35??Multiratensysteme_MATLAB（Chinese?Version）\ab_band_gui.fig
?????文件???????12358??2008-09-28?15:56??Multiratensysteme_MATLAB（Chinese?Version）\ab_band_gui.m
?????文件???????25255??2002-06-20?22:25??Multiratensysteme_MATLAB（Chinese?Version）\ab_graph.png
?????文件???????16181??2008-07-30?01:40??Multiratensysteme_MATLAB（Chinese?Version）\ab_gui.fig
?????文件????????7516??2008-09-25?19:49??Multiratensysteme_MATLAB（Chinese?Version）\ab_gui.m
?????文件?????????612??2008-10-02?03:24??Multiratensysteme_MATLAB（Chinese?Version）\arrow.m
?????文件???????17893??2008-10-02?03:24??Multiratensysteme_MATLAB（Chinese?Version）\asynau.m
?????文件???????18572??2008-09-28?22:03??Multiratensysteme_MATLAB（Chinese?Version）\asynau_gui.fig
?????文件???????10988??2002-11-01?19:07??Multiratensysteme_MATLAB（Chinese?Version）\asynau_gui.m
?????文件????????8395??2008-10-02?03:24??Multiratensysteme_MATLAB（Chinese?Version）\auf.m
?????文件???????32236??2008-09-24?23:42??Multiratensysteme_MATLAB（Chinese?Version）\auf_graph.png
?????文件???????16129??2008-09-25?21:43??Multiratensysteme_MATLAB（Chinese?Version）\auf_gui.fig
?????文件????????5979??2002-07-12?00:46??Multiratensysteme_MATLAB（Chinese?Version）\auf_gui.m
?????文件?????????381??2003-10-07?21:05??Multiratensysteme_MATLAB（Chinese?Version）\ausblenden.m
?????文件?????????181??2002-08-15?22:52??Multiratensysteme_MATLAB（Chinese?Version）\ausblenden2.m
?????文件?????????180??2002-06-20?17:22??Multiratensysteme_MATLAB（Chinese?Version）\ausblenden_dezint.m
?????文件????????6550??2008-10-02?03:24??Multiratensysteme_MATLAB（Chinese?Version）\AUSGABE.m
?????文件???????36299??2008-10-02?03:48??Multiratensysteme_MATLAB（Chinese?Version）\DATEN.mat
?????文件???????12596??2008-10-02?03:27??Multiratensysteme_MATLAB（Chinese?Version）\dcs.m
?????文件???????53545??2002-08-15?23:49??Multiratensysteme_MATLAB（Chinese?Version）\dcs_graph.png
?????文件???????22644??2008-09-30?11:17??Multiratensysteme_MATLAB（Chinese?Version）\dcs_gui.fig
?????文件????????7756??2008-09-30?12:24??Multiratensysteme_MATLAB（Chinese?Version）\dcs_gui.m
?????文件????????1069??2008-10-02?03:27??Multiratensysteme_MATLAB（Chinese?Version）\delta.m
?????文件????????1178??2008-10-02?03:27??Multiratensysteme_MATLAB（Chinese?Version）\delta_bp.m
?????文件????????9027??2008-10-02?03:27??Multiratensysteme_MATLAB（Chinese?Version）\dezimation.m
?????文件???????32906??2008-09-24?23:33??Multiratensysteme_MATLAB（Chinese?Version）\dezimation_graph.png
?????文件???????16099??2008-07-30?05:06??Multiratensysteme_MATLAB（Chinese?Version）\dezimation_gui.fig
............此處省略206個文件信息