diff --git a/ld1/kcmpnd.m b/ld1/kcmpnd.m
index 24acc5e..cf485fa 100644
--- a/ld1/kcmpnd.m
+++ b/ld1/kcmpnd.m
@@ -1,6 +1,6 @@
 function Kcmp = kcmpnd(Ain,Str)
 % Kompresora pastiprinajuma koeficients
-Kcmp = zeros (size(Ain));
-Kcmp(Ain>0)=log10(Str*Ain(Ain>0)+1)./...
+Kcmp=zeros(size(Ain));
+Kcmp(Ain>0)=log10(Str*Ain(Ain>0)+1)./ ...
     Ain(Ain>0)/log10(Str+1);
-Kcmp(Ain<=0)=Str/log(Str+1);
\ No newline at end of file
+Kcmp(Ain<=0) = Str/log(Str+1);
\ No newline at end of file
diff --git a/ld1/kexpnd.m b/ld1/kexpnd.m
new file mode 100644
index 0000000..890f9c6
--- /dev/null
+++ b/ld1/kexpnd.m
@@ -0,0 +1,6 @@
+function Kexp = kexpnd(Arin,Str)
+% Kompresora pastiprinajuma koeficients
+Kexp=zeros(size(Arin));
+% Kexp=((Str + 1).^Arin - 1)./Str;
+% Kexp = (exp(Arin.*log(Str+1)) - 1 ) ./ Str;
+Kexp =  ((Str + 1).^Arin - 1)./(Arin.*Str);
\ No newline at end of file
diff --git a/ld1/ld1.m b/ld1/ld1.m
index 4a1828b..3d7f570 100644
--- a/ld1/ld1.m
+++ b/ld1/ld1.m
@@ -1,11 +1,85 @@
-%% % Runas signala komplresors analogajam signalam
-
+%% Funkcionalo un logisko shemu modelesana
+% Laboratorijas darbs Nr.1.
+% Runas signala kompresijas sistama
+% Autors: Imants Pulkstenis
+%
+figure (1)
 Ain = linspace(0,1);
 Ktr = kcmpnd(Ain,600);
-figure(1)
-plot(Ain,Ktr)
+plot(Ain,Ktr.*Ain,'LineWidth',2)
+title('Compressor A_{out}(A_{in})')
+xlabel('A_{in}')
+ylabel('A_{out}')
+grid on
 
+figure (2)
 Ain = linspace(0,1);
 Ktr = kcmpnd(Ain,600);
-figure(2)
-plot(Ain,Ktr.*Ain)
\ No newline at end of file
+plot(Ain,Ktr,'LineWidth',2)
+title('Compressor Gain')
+xlabel('A_{in}')
+ylabel('K_{tr}')
+grid on
+
+% Meroga koeficentu iegusana
+Str = [400; 450; 500; 550; 600];
+Aoutmax = log10(Str+1)*20;
+T = table(Str,Aoutmax),
+
+% Dekompresora raksturliknes
+syms Arin Str Arout
+% equ = Arin*log10(Str+1)-log10(Str*Arout+1);
+equ = Arin*log10(Str+1)-log10(Str*Arin*Arout+1);
+solve(equ,Arout);
+pretty(ans),
+
+Arin = linspace(0,1);
+Krc = kexpnd(Arin,600);
+
+figure(3)
+plot(Arin,Krc.*Arin,'LineWidth',2)
+title('Expander A_{rout}(A_{rin})')
+xlabel('A_{rin}')
+ylabel('A_{rout}')
+grid on
+
+figure(4)
+plot(Arin,Krc,'LineWidth',2)
+title('Expander Gain')
+xlabel('A_{rin}')
+ylabel('K_{rc}')
+grid on
+
+% linearitates parbaude
+figure(5)
+Ain = linspace(0,1);
+Arin = (Ain.*kcmpnd(Ain,600));
+Arout = Arin.*kexpnd(Arin,600);
+plot(Ain,Arout,'LineWidth',2)
+title('A_{rout}(A_{in})')
+xlabel('A_{in}')
+ylabel('A_{rout}')
+grid on
+
+% Vienkarsa LPF realizacija
+syms tau s z Fs
+Hs = 1/(tau*s+1);
+bilin = 2*Fs*(z-1)/(z+1);
+Hz = simplify(subs(Hs,s,bilin));
+Hz = collect(Hz);
+pretty(Hz),
+
+% RC kedes parvades raksturlikne
+figure(6)
+tau = 1e-3; Fs = 8000;
+f = linspace(0,10000,1000);
+hs = freqs(1,[tau,1],2*pi*f);
+b = [1,1];
+a = [1+2*tau*Fs,1-2*tau*Fs];
+hz = freqz(b,a,f,Fs);
+semilogx(f,abs(hs),'-b', f,abs(hz), '--b', 'LineWidth',2);
+title('Magnitudes for H(s) and H(z)')
+xlabel('Frequency [Hz]')
+%ylabel('magnitude')
+grid on
+legend ('H(s)','H(z)','Location','southwest')
\ No newline at end of file
diff --git a/ld1/ld1_simulink.slx b/ld1/ld1_simulink.slx
new file mode 100644
index 0000000..eeaa88b
Binary files /dev/null and b/ld1/ld1_simulink.slx differ