DSP Lab Manual.pdf

Continuous signal generation

Output:

Enter the value of frequency3

Enter the value of amplitude2.5

>>

Program:

clc;

clear all;

close all;

t=0:.001:1;

f=input('Enter the value of frequency');

a=input('Enter the value of amplitude');

subplot(3,2,1);

y=a*sin(2*pi*f*t);

plot(t,y,'r');

xlabel('time --->');

ylabel('amplitude --->');

title('sine wave')

grid on;

subplot(3,2,2);

z=a*cos(2*pi*f*t);

plot(t,z);



title('cosine wave')

grid on;

subplot(3,2,3);

s=a*square(2*pi*f*t);

plot(t,s);



title('square wave')

grid on;

subplot(3,2,4);

plot(t,t);



title('ramp wave')

grid on;

subplot(3,2,5);

plot(t,a,'r');



title('unit step wave')

grid on;

Discrete signal generation

Output:

Enter the value of frequency.04

Enter the value of amplitude2.5

Enter the length of unit step9

>>

Program:

clc;

clear all;

close all;

n=0:1:50;

f=input('Enter the value of frequency');

a=input('Enter the value of amplitude');

N=input('Enter the length of unit step');

subplot(3,2,1);

y=a*sin(2*pi*f*n);

stem(n,y,'r');



title('sine wave')

grid on;

subplot(3,2,2);

z=a*cos(2*pi*f*n);

stem(n,z);



title('cosine wave')

grid on;

subplot(3,2,3);

s=a*square(2*pi*f*n);

stem(n,s);



title('square wave')

grid on;

subplot(3,2,4);

stem(n,n);



title('ramp wave')

grid on;

x=0:N-1;

d=ones(1,N);

subplot(3,2,5);

stem(x,d,'r');



title('unit step wave')

grid on;

Linear Convolution

Output:

ENTER THE FIRST SEQUENCE [1 4 1 3]

ENTER THE SECOND SEQUENCE [4 5 2 6]

>>

Program: clc;

clear all;

close all;

x=input('ENTER THE FIRST SEQUENCE ');

h=input('ENTER THE SECOND SEQUENCE ');

y=conv(x,h);

figure(1);

subplot(3,1,1);

stem(x);

grid on;

xlabel('Amplitude---->');

ylabel('time----->');

title('FIRST SEQUENCE');

subplot(3,1,2);

stem(h);

grid on;



title('SECOND SEQUENCE');

subplot(3,1,3);

stem(y);

grid on;



title('LINEAR CONVOLUTION');

Circular Convolution

Output:

Enter the co-efficients of x1[n]=[1 2 3 2 5]

Enter the co-efficients of x2[n]=[5 2 3 1 3]

30 38 33 38 43

>>

Program:

clc;

clear all;

close all;

x=input('Enter the co-efficients of x1[n]=');

h=input('Enter the co-efficients of x2[n]=');

n1=length(x);

n2=length(h);

N=max(n1,n2);

x=[x,zeros(1,N-n1)];

h=[h,zeros(1,N-n2)];

for n=0:N-1;

y(n+1)=0;

for k=0:N-1;

j= mod(n-k,N);

y(n+1)=y(n+1)+x(k+1)*h(j+1);

end

end

subplot(3,1,1);

n=0:(length(x)-1);

stem(n,x);

grid on;

xlabel('TIME');

ylabel('AMPLITUDE');

title('x1[n]');

subplot(3,1,2);

n=0:(length(h)-1);

stem(n,h);

grid on;

xlabel('TIME');


title('x2[n]');

subplot(3,1,3);

n=0:(length(y)-1);

stem(n,y);

grid on;

disp(y)

xlabel('TIME');


title('OUTPUTx3[n]');

DIGITAL BUTTERWORTH FILTER

Output:

Enter the passband attenuation:.4

Enter the stop band attenuation:30

Enter the pass band frequency:.2*pi

Enter the stop band frequency:.4*pi

>>

Program :

clc;

clear all;

close all;

rp=input('Enter the passband attenuation:');

rs=input('Enter the stop band attenuation:');

wp=input('Enter the pass band frequency:');

ws=input('Enter the stop band frequency:');

[N,wn]=buttord(wp/pi,ws/pi,rp,rs);

%DIGITAL BUTTERWORTH LOW PASS FILTER

[b,a]=butter(N,wn,'low');

figure(1);

freqz(b,a);

title('DIGITAL BUTTERWORTH LOW PASS FILTER');

%DIGITAL BUTTERWORTH HIGH PASS FILTER

[N,wn]=buttord(wp/pi,ws/pi,rp,rs);

[b,a]=butter(N,wn,'high');

figure(2);

freqz(b,a);

title('DIGITAL BUTTERWORTH HIGH PASS FILTER');

%DIGITAL BUTTERWORTH BAND PASS FILTER

wpb=[wp,ws];

wsb=[wp-.1*pi,ws+.1*pi];

[N,wn]=buttord(wpb/pi,wsb/pi,rp,rs);

[b,a]=butter(N,wn,'bandpass');

figure(3);

freqz(b,a);

title('DIGITAL BUTTERWORTH BAND PASS FILTER');

%DIGITAL BUTTERWORTH BAND STOP FILTER

wps=wsb;

wss=wpb;

[N,wn]=buttord(wps/pi,wss/pi,rp,rs);

[b,a]=butter(N,wn,'stop');

figure(4);

freqz(b,a);

title('DIGITAL BUTTERWORTH BAND STOP FILTER');

DIGITAL CHEBYSHEV(TYPE-1) FILTER

Output:

Enter the passband attenuation:20

Enter the stop band attenuation:50

Enter the pass band frequency:0.3*pi

Enter the stop band frequency:0.4*pi

>>

Program:

clc;

clear all;

close all;

rp=input('Enter the passband attenuation:');

rs=input('Enter the stop band attenuation:');

wp=input('Enter the pass band frequency:');

ws=input('Enter the stop band frequency:');

%DIGITAL CHEBYSHEV LOW PASS FILTER

[N,wn]=cheb1ord(wp/pi,ws/pi,rp,rs);

[b,a]=cheby1(N,rp,wn,'low');

figure(1);

freqz(b,a);

title('DIGITAL CHEBYSHEV LOW PASS FILTER');

%DIGITAL CHEBYSHEV HIGH PASS FILTER

[N,wn]=cheb1ord(wp/pi,ws/pi,rp,rs);

[b,a]=cheby1(N,rp,wn,'high');

figure(2);

freqz(b,a);

title('DIGITAL CHEBYSHEV HIGH PASS FILTER');

%DIGITAL CHEBYSHEV BAND PASS FILTER

wpb=[wp,ws];

wsb=[wp-.1*pi,ws+.1*pi];

[N,wn]=cheb1ord(wpb/pi,wsb/pi,rp,rs);

[b,a]=cheby1(N,rp,wn,'bandpass');

figure(3);

freqz(b,a);

title('DIGITAL CHEBYSHEV BAND PASS FILTER');

%DIGITAL CHEBYSHEV BAND STOP FILTER

wps=wsb;

wss=wpb;

[N,wn]=cheb1ord(wps/pi,wss/pi,rp,rs);

[b,a]=cheby1(N,rp,wn,'stop');

figure(4);

freqz(b,a);

title('DIGITAL CHEBYSHEV BAND STOP FILTER');

FIR FILTER USING HANNING WINDOW

Output:

Enter the value of N:28

Enter cutoff frequency:0.5*pi

>>

Program:

clc;

clear all;

close all;

N=input('Enter the value of N:');

wc=input('Enter cutoff frequency:');

%FIR LOW PASS FILTER USING HANNING WINDOW

h=fir1(N,wc/pi,hanning(N+1));

figure(1);

freqz(h);

title('DIGITAL HANNING LOW PASS FILTER');

%FIR HIGHPASS FILTER USING HANNING WINDOW

h=fir1(N,wc/pi,'high',hanning(N+1));

figure(2);

freqz(h);

title('DIGITAL HANNING HIGH PASS FILTER');

%FIR BAND PASS FILTER USING HANNING WINDOW

wcc=[wc-.2*pi,wc+.2*pi];

h=fir1(N,wcc/pi,hanning(N+1));

figure(3);

freqz(h);

title('DIGITAL HANNING BAND PASS FILTER');

%FIR STOP PASS FILTER USING HANNING WINDOW

h=fir1(N,wcc/pi,'stop',hanning(N+1));

figure(4);

freqz(h);

title('DIGITAL HANNING BAND STOP FILTER');

FIR FILTER USING HAMMING WINDOW

Output:



>>

Program:

clc;

clear all;

close all;



%FIR LOW PASS FILTER USING HAMMING WINDOW

h=fir1(N,wc/pi,hamming(N+1));

figure(1);

freqz(h);

title('DIGITAL HAMMING LOW PASS FILTER');

%FIR HIGHPASS FILTER USING HAMMING WINDOW

h=fir1(N,wc/pi,'high',hamming(N+1));

figure(2);

freqz(h);

title('DIGITAL HAMMING HIGH PASS FILTER');

%FIR BAND PASS FILTER USING HAMMING WINDOW


h=fir1(N,wcc/pi,hamming(N+1));

figure(3);

freqz(h);

title('DIGITAL HAMMING BAND PASS FILTER');

%FIR STOP PASS FILTER USING HAMMING WINDOW

wcs=[wc-.3*pi,wc+.3*pi];

h=fir1(N,wcs/pi,'stop',hamming(N+1));

figure(4);

freqz(h);

title('DIGITAL HAMMING BAND STOP FILTER');

FIR FILTER USING BLACKMAN WINDOW

Output:



>>

Program:

clc;

clear all;

close all;



%FIR LOW PASS FILTER USING BLACKMAN WINDOW

h=fir1(N,wc/pi,blackman(N+1));

figure(1);

freqz(h);

title('DIGITAL BLACKMAN LOW PASS FILTER');

%FIR HIGHPASS FILTER USING BLACKMAN WINDOW

h=fir1(N,wc/pi,'high',blackman(N+1));

figure(2);

freqz(h);

title('DIGITAL BLACKMAN HIGH PASS FILTER');

%FIR BAND PASS FILTER USING BLACKMAN WINDOW


h=fir1(N,wcc/pi,blackman(N+1));

figure(3);

freqz(h);

title('DIGITAL BLACKMAN BAND PASS FILTER');

%FIR STOP PASS FILTER USING BLACKMAN WINDOW


h=fir1(N,wcs/pi,'stop',blackman(N+1));

figure(4);

freqz(h);

title('DIGITAL BLACKMAN BAND STOP FILTER');

FIR FILTER USING RECTANGULAR WINDOW

Output:



>>

Program:

clc;

clear all;

close all;



%FIR LOW PASS FILTER USING RECTANGULAR WINDOW

h=fir1(N,wc/pi,rectwin(N+1));

figure(1);

freqz(h);

title('DIGITAL RECTANGULAR LOW PASS FILTER');

%FIR HIGHPASS FILTER USING RECTANGULAR WINDOW

h=fir1(N,wc/pi,'high',rectwin(N+1));

figure(2);

freqz(h);

title('DIGITAL RECTANGULAR HIGH PASS FILTER');

%FIR BAND PASS FILTER USING RECTANGULAR WINDOW


h=fir1(N,wcc/pi,rectwin(N+1));

figure(3);

freqz(h);

title('DIGITAL RECTANGULAR BAND PASS FILTER');

%FIR STOP PASS FILTER USING RECTANGULAR WINDOW


h=fir1(N,wcs/pi,'stop',rectwin(N+1));

figure(4);

freqz(h);

title('DIGITAL RECTANGULAR BAND STOP FILTER');

DISCRETE FOURIER TRANSFORM

Output:

Enter your Choice: 1.DFT 2.IDFT1

Enter the value of N4

Enter the input sequence X(n):[1 2 3 4]

in =

1 2 3 4

out =

10.0000 -2.0000 + 2.0000i -2.0000 -2.0000 - 2.0000i

>>

Program:

clc;

clear all;

close all;

ch=input('Enter your Choice: 1.DFT 2.IDFT');

ifch==1

N=input('Enter the value of N');

x=input('Enter the input sequence X(n):');

t=0:N-1;

y=fft(x,N);

in=x

out=y

elseifch==2

N=input('Enter the value of N=');

y=input('Enter the sequence y[n]=');

t=0:N-1;

x=ifft(y,N);

in=y

out=x

end

subplot(2,1,1);

stem(t,in);

xlabel('TIME --->');

ylabel('AMPLITUDE --->');

title('INPUT SIGNAL');

grid on;

subplot(2,1,2);

stem(t,out);

xlabel('TIME --->');

ylabel('AMPLITUDE --->');

title('OUTPUT SIGNAL');

grid on;

INVERSE DISCRETE FOURIER TRANSFORM

Output:

Enter your Choice: 1.DFT 2.IDFT2

Enter the value of N=4

Enter the sequence y[n]=[10 -2+2i -2 -2-2i]

in =

10.0000 -2.0000 + 2.0000i -2.0000 -2.0000 - 2.0000i

out =

1 2 3 4

>>

Program:

Adder

;-------------------------------------------------

;Frontline Electronics Pvt Ltd, Salem, INDIA. 23-10-2001

;

;fix32add.asm - Fixed point 32bit addition.

;-------------------------------------------------

.mmregs;initialise all registers.

.ds 1000h

X1 .word 55h ;X input -> X1 X0 (32 bits)

X0 .word 66h

Y1 .word 77h ;Y input -> Y1 Y0 (32 bits)

Y0 .word 88h

Z1 .word 0 ;Z output -> Z1 Z0 (32 bits)

Z0 .word 0

.listoff

;-------------------------------------------------

;Frontline Electronics Pvt Ltd, Salem, INDIA.

;

;Begin1.asm - Example programs beginning code.

; (without AIC initialization).

;-------------------------------------------------


;-------------------------

;Main Program starts here.

;-------------------------

.ps 0a00h ;set program segment starting address.

.entry ;set entry point,used in down loading program.

START: SETC INTM ;disable all Interrupts.

LDP #00 ;data page pointer = 0.

OPL #0834h,PMST;set processor mode status reg.

LACC #00 ;accumulator = 00.

SAMM CWSR ;storeaccu. in CWSR & PDWSR.

SAMM PDWSR ;clear wait state registers.

SPLK #02h,IMR ;enable INT2.

;you must enable INT2 always,because

;it is used for serial communication

;between starter kit & host computer.

CLRC INTM ;clear interrupt mask bit.

.liston

ADD32:

ldp #X0 ;set data page pointer.

lacc X1,16 ;Acc = X1 00

adds X0 ;Acc = X1 X0

adds Y0 ;Acc = X1 X0 + 00 Y0

add Y1,16 ;Acc = X1 X0 + Y1 Y0

sacl Z0 ;store Z0 result.

sach Z1 ;store Z1 result.

hlt: b hlt ;halt program.

.END ;end of program.

Program:

Multiplier

;-------------------------------------------------


;

;fx16m_s.asm - Fixed point signed 16bit multiplication.

;-------------------------------------------------


.ds 1000h

X0 .word 55h ;X input -> X0 (16 bits)

Y0 .word 77h ;Y input -> Y0 (16 bits)


Z0 .word 0

.listoff

;-------------------------------------------------


;



;-------------------------------------------------


;-------------------------


;-------------------------







SAMM CWSR ;storeaccu. in CWSR & PDWSR.







.liston

MUL16:


lt X0 ;load X0 in T register.

mpy Y0 ;multiply T * Y0 (signed).

spl Z0 ;store Product reg. low in Z0.

sph Z1 ;store Product reg. high in Z1.



Program:

Sine Wave Generator

;---------------------------------------------------------


;

;sine.asm - Example program to generate sinewave.

; (FEPL 5X DSK target board).

;---------------------------------------------------------


.ds 1000h

.include "sinetbl.dat" ;load 800 point wavetable

;f1= fs/D = 8000/800 = 10hz.

.ds 0f00h

temp .word 0

mod .word 100 ;Required freq. = mod * f1 = 100*10 = 1000hz.

scale .q15 0.5

;---------------------------------

;Interrupt vectors

;---------------------------------

.ps 080ah

rint b getdata ;receive interrupt

xint b xint ;transmit interrupt

.ps 0a00h ;program entry point

.entry

;---------------------------------

;Processor initialization

;---------------------------------

;--------------------------------------------------------

;Frontline Electronics Pvt Ltd, Salem, INDIA. 04-FEB-2001

;

;TMS320c50 Processor initialization program for DSP LAB.

; (FEPL 5X EVM target board).

;--------------------------------------------------------

start: ldp #0 ;data page pointer to page zero

setc INTM ;globally disable interrupts

setc SXM ;set sign extension mode

setc OVM ;set saturation on arithmetic overflow

clrc CNF ;configure B0 as data memory.

spm 0 ;no product register shift.

splk #0834h,PMST ;set processor mode status reg.

lacl #0 ;accumulator = 00.

samm CWSR ;store accu. in CWSR & PDWSR.

samm PDWSR ;clear wait state registers.

clrc CNF ;B0 is in data memory.

splk #0,gotflag ;zero data received flag

splk #0,outbuff ;zero output storage flag

splk #012h,IMR ;enable RINT & INT2.

call ac01_init ;call to initialize serial port & AC01.

clrc INTM ;enable all interrupts.

wait: nop ;wait for interrupt.

b wait

;---------------------------------

;Receive interrupt handler

;---------------------------------

getdatasplk #1,gotflag ;set a flag to indicate data available.

lamm DRR

ldp #mod ;set data page pointer.

lacc mod ;load modifier

samm INDX ;store modifier in INDX register.

callwavgen ;calculate current sample output from wavetable.

and #0FFFCh,0 ;only 14 MSBs are used in ADC &DAC,So

; mask unused two LSBs.

samm DXR ;send digital data to DAC to produce analog o/p.

clrc INTM ;enable interrupt.

rete ;return back to main from interrupt routine.

offset .set 1320h ;table length = 800 + table start address.

;-------------------------------------------------


;

;wavgen.asm - waveform generation module.

;-------------------------------------------------

wavgen:

ldp #temp ;set Data page pointer.

mar *,AR1 ;set current ARP to AR1(wavetable pointer)

lt *0+ ;load T-reg with wavetable current data,

;and modify pointer to point next data.

sar AR1,temp

lacc temp

sub #offset,0 ;subtract offset, to check end of table.

bcndn_oflw,LT

or #1000h,0 ;if table exceeds limit, initialize

sacl temp ;wavetable pointer(circular buffer effect).

lar AR1,temp

n_oflw: mpy scale ;scaling correction.

apac ;accumulator = scaled sample.

sach temp,1

lacc #0

lacl temp

ret ;return.

;---------------------------------

;AC01 register initialization.

;---------------------------------

REG1 .set 0124h

; 0000000100100100b ;36 -> 8ks/sec @ 10.368Mhz clockin

REG2 .set 0212h

; 0000001000010010b ;reg 2 = B register 18(18,default),8ks/sec

; ||||||||||||||||

; ||||||||++++++++-- data

; |||+++++---------- address

; ||+--------------- 0 = write

; ++---------------- phase shift

REG4 .set 0417h

; 0000010000010111b ;reg4 amplifier gain sellect

; ||||||||||||||++-- output 0=sq, 1=0 dB, 2=-6 dB, 3=-12 dB

; ||||||||||||++---- input 0=sq, 1=0 dB, 2=+6 dB, 3=+12 dB

; ||||||||||++------ monitor 0=sq, 1=0 dB, 2=-8 dB, 3=-18 dB

; ||||||||++-------- not used

; |||+++++---------- address

; ||+--------------- 0 = write

; ++---------------- phase shift

REG5 .set 0505h

; 0000010100000101b ;reg5 Analog configuration

; ||||||||||||||++-- 0=loopback, 1=norm i/p, 2=aux i/p, 3=both

; |||||||||||||+---- 0=hp filter on, 1=hpfilter off

; ||||||||||||+----- 0=echo off, 1=echo on

; ||||||||++++------ not used

; |||+++++---------- address

; ||+--------------- 0 = write

; ++---------------- phase shift

;---------------------------------

;Serial port and AC01 initialization

;---------------------------------

;--------------------------------------------------------

;Frontline Electronics Pvt Ltd, Salem, INDIA. 04-FEB-2002

;

;AC01INZ.asm - AC01-AIC chip initialisation program for DSP LAB.

; (FEPL 5X EVM target board).

;--------------------------------------------------------

;---------------------------------

;Internal memory buffers

;---------------------------------

gotflag .set 60h ;used to signal that an interrupt

;came from the serial port.

ac01_init

;set up serial port

splk #0,dxr ;zero data transmit register

splk #08h,SPC ;use external clock and sync.

opl #0c0h,SPC ;take it out of reset.

splk #0ffffh,IFR ;clear all interrupt flag bits

clrc INTM ;enable interrupts

callwaitint ;wait for interrupt from serial port.

;reset AC01 AIC

lacc #080h ;accu = 00000080h

sacl GREG ;set GREG to 0080h,to select global memory

lar ar0,#0FFFFh ;set AR0 = 0ffffh.

rpt #10 ;repeat following instruction 10 times.(delay).

lacc *,0,ar0 ;dummy read to reset AIC.

lacl #0

sacl GREG ;remove global memory.

;setup codec - only need to reprogram those registers that need

; to be changed from their defaults

;reg 0 = default

lacc #REG1,0 ;reg 1 = A register (18 = default)

callprogreg

lacc #REG2,0 ;reg 2 = B register (18 = default)

callprogreg

;reg3 = A' register = default.

lacc #REG4,0 ;reg4 amplifier gain sellect

callprogreg

lacc #REG5,0 ;reg5 Analog configuration

callprogreg

;reg6, digital configuration = default

;reg7, frame sync delay = default

;reg8, frame sync number = default

ret

;---------------------------------

;wait for interrupt subroutine

;---------------------------------

waitint

laccgotflag

bcndwaitint,EQ ;wait for semaphore to be changed

splk #0,gotflag ;set it again

ret

;------------------------------------

;AC01 register programming subroutine

; input: ACC = register command

;------------------------------------

progregsacb ;backup command in Acc B

splk #03h,dxr ;request secondary communication.

callwaitint ;wait for transmission

lacb ;load commnd from Acc B

sammdxr ;send value

callwaitint ;wait

ret


Sine wave generation


.ds 1000h

.include "sinetbl.dat" ;load 800 point wavetable

;f1= fs/D = 8000/800 = 10hz.

.ds 0f00h

temp .word 0

mod .word 100 ;Required freq. = mod * f1 = 100*10 = 1000hz.

scale .q15 0.5

.ps 080ah

rint b getdata ;receive interrupt

xint b xint ;transmit interrupt

.ps 0a00h ;program entry point

.entry

.include "c5xinz.asm"

splk #012h,IMR ;enable RINT & INT2.

call ac01_init ;call to initialize serial port & AC01.

clrc INTM ;enable all interrupts.

wait: nop ;wait for interrupt.

b wait

getdatasplk #1,gotflag ;set a flag to indicate data available.

lamm DRR

ldp #mod ;set data page pointer.

lacc mod ;load modifier

samm INDX ;store modifier in INDX register.

callwavgen ;calculate current sample output from wavetable.

and #0FFFCh,0 ;only 14 MSBs are used in ADC &DAC,So

; mask unused two LSBs.

samm DXR ;send digital data to DAC to produce analog o/p.

clrc INTM ;enable interrupt.

rete ;return back to main from interrupt routine.

offset .set 1320h ;table length = 800 + table start address.

.include "wavgen.asm" ;includewavgen module.

REG1 .set 0124h

; 0000000100100100b ;36 -> 8ks/sec @ 10.368Mhz clockin

REG2 .set 0212h

; 0000001000010010b ;reg 2 = B register 18(18,default),8ks/sec

; ||||||||||||||||

; ||||||||++++++++-- data

; |||+++++---------- address

; ||+--------------- 0 = write

; ++---------------- phase shift

REG4 .set 0417h

; 0000010000010111b ;reg4 amplifier gain sellect

; ||||||||||||||++-- output 0=sq, 1=0 dB, 2=-6 dB, 3=-12 dB

; ||||||||||||++---- input 0=sq, 1=0 dB, 2=+6 dB, 3=+12 dB

; ||||||||||++------ monitor 0=sq, 1=0 dB, 2=-8 dB, 3=-18 dB

; ||||||||++-------- not used

; |||+++++---------- address

; ||+--------------- 0 = write

; ++---------------- phase shift

REG5 .set 0505h

; 0000010100000101b ;reg5 Analog configuration

; ||||||||||||||++-- 0=loopback, 1=norm i/p, 2=aux i/p, 3=both

; |||||||||||||+---- 0=hp filter on, 1=hpfilter off

; ||||||||||||+----- 0=echo off, 1=echo on

; ||||||||++++------ not used

; |||+++++---------- address

; ||+--------------- 0 = write

; ++---------------- phase shift

.include "ac01inz.asm"


Adder


.ds 1000h

X1 .word 55h ;X input -> X1 X0 (32 bits)

X0 .word 66h

Y1 .word 77h ;Y input -> Y1 Y0 (32 bits)

Y0 .word 88h


Z0 .word 0

.include "begin1.asm" ;Initialisation routine.

ADD32:


lacc X1,16 ;Acc = X1 00

adds X0 ;Acc = X1 X0

adds Y0 ;Acc = X1 X0 + 00 Y0

add Y1,16 ;Acc = X1 X0 + Y1 Y0

sacl Z0 ;store Z0 result.

sach Z1 ;store Z1 result.



Multiplier


.ds 1000h

X0 .word 55h ;X input -> X0 (16 bits)

Y0 .word 77h ;Y input -> Y0 (16 bits)


Z0 .word 0

.include "begin1.asm"; Initialisation routine.

MUL16:


lt X0 ;load X0 in T register.

mpy Y0 ;multiply T * Y0 (signed).

spl Z0 ;store Product reg. low in Z0.

sph Z1 ;store Product reg. high in Z1.



PERIODOGRAM BASED ON SPECTRAL EFFICIENCY

Output:

Enter the length of the sequence4

length of the fft4

Sampling frequency500

Program: clc;

close all;

clear all;

n=input('Enter the length of the sequence');

window=hamming(n);

nfft=input('length of the fft');

fs=input('Sampling freq');

n=0:1:n-1;

x=cos(2*0.1*pi*n/fs)+sin(2*0.4*pi*n/fs)+0.01*rand(size(n));

subplot(2,1,1);

plot(n,x);

xlabel('n');

ylabel('x(n)');

[pxx,f]=periodogram(x,window,nfft,fs);

subplot(2,1,2);

plot(f/fs,10*log10(pxx));

grid;

xlabel('|omega| \pi');

ylabel('Power spectrum');

title('Periodogram');

Program: clc;

close all;

clear all;

t=0:1/200:10;

y=3*cos(2*pi*50*t/200)+1*cos(2*pi*100*t/200);

figure(1);

stem(y);

xlabel({'Times in seconds';'(a)'});

ylabel('Amplitude');

figure(2);

stem(decimate(y,20));

xlabel({'Times in seconds';'(b)'});


figure(3);

stem(interp(decimate(y,20),2));

xlabel({'Times in seconds';'(c)'});


DECIMATOR AND INTERPOLATOR

Output:

Program: clc;

clear all;

close all;

fm=15;

t=0:0.001:0.5;

in_sig=cos(2*pi*fm*t);

subplot(2,2,1);

plot(t,in_sig);

title('input sig');

fs1=2*fm;

t1=0:1/fs1:.5;

out_sig1=cos(2*pi*fm*t1);

subplot(2,2,2);

plot(2*pi*fm*t1,out_sig1);

title('fs=2fm');

fs2=2*fm+50;

t2=0:1/fs2:.5;


subplot(2,2,3);


title('fs>2fm');

fs3=2*fm-2;

t3=0:1/fs3:.5;


subplot(2,2,4);


title('fs<2fm(aliasing)');

SAMPLING AND EFFECT OF ALIASING

Output:

Program:

Division

;-------------------------------------------------


;

;fx16id.asm - Fixed point signed 16bit integer division.

;-------------------------------------------------

.mmregs ;initialise all registers.

.ds 1000h

TEMSGN .word 0

DENOM .word 05h

NUMERA .word 19h

QUOT .word 0

REM .word 0

.listoff

;-------------------------------------------------


;



;-------------------------------------------------

.mmregs ;initialise all registers.

;-------------------------


;-------------------------







SAMM CWSR ;store accu. in CWSR & PDWSR.







.liston

INTDIV:

setc sxm ;set sign extention.

clrc ovm ;clear overflow mode.

ldp #DENOM ;set data page pointer.

lt NUMERA ;determine sign of quotient.

mpy DENOM

sph TEMSGN ;save the sign.

lacc DENOM

abs ;make denominator and numerator positive.

sacl DENOM ;save absolute value of denominator.

lacc NUMERA

abs ;acc. = absolute value of numerator.

rpt #15 ;16 cycle division. Low accumulator contains

subc DENOM ;the quotient and high accumulator contains

;the remainder at the end of the loop.

bit TEMSGN,0;Test sign of quotient.

sach REM ;Save remainder.

xc 1,TC ;

neg ;if sign negative, negate quoitient.

sacl QUOT ;Store quotient.



Date post:	21-Jan-2016
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