| Line 8: | Line 8: | ||
% PART A | % PART A | ||
delta = 0.0005; | delta = 0.0005; | ||
| − | H=0:delta: 1; | + | H=0:delta: 1; %half |
| − | Q=0:delta:0.5; | + | Q=0:delta:0.5; %quacter |
| − | DQ_time=0:delta:0.75; | + | DQ_time=0:delta:0.75; %dotted quacter |
| − | EN=0:delta:0.25; | + | EN=0:delta:0.25; %one eighth |
| + | %Assign signals for each used note | ||
AH = sin(2*pi*220*H); | AH = sin(2*pi*220*H); | ||
BQ= sin(2*pi*493.88/2*Q); | BQ= sin(2*pi*493.88/2*Q); | ||
| Line 31: | Line 32: | ||
% PART B | % PART B | ||
| + | |||
| + | %half the duration | ||
| + | %we will hear the some plays at twice speed as before | ||
| + | |||
delta = 0.0005; | delta = 0.0005; | ||
H=0:delta: 0.5; | H=0:delta: 0.5; | ||
| Line 55: | Line 60: | ||
% PART C | % PART C | ||
| + | |||
| + | %Change the duration back to part a | ||
delta = 0.0005; | delta = 0.0005; | ||
H=0:delta: 1; | H=0:delta: 1; | ||
| Line 60: | Line 67: | ||
DQ_time=0:delta:0.75; | DQ_time=0:delta:0.75; | ||
EN=0:delta:0.25; | EN=0:delta:0.25; | ||
| + | |||
| + | %as we replace t with 2t,so double the time in signal function | ||
| + | %which also means double the frequency of each signal | ||
| + | %we will hear a song with higher pitch | ||
AH = sin(2*pi*2*220*H); | AH = sin(2*pi*2*220*H); | ||
Revision as of 17:49, 2 September 2008
%Hetong Li %09/01/08 %ECE301 hw1.1 clear; clc; % PART A delta = 0.0005; H=0:delta: 1; %half Q=0:delta:0.5; %quacter DQ_time=0:delta:0.75; %dotted quacter EN=0:delta:0.25; %one eighth %Assign signals for each used note AH = sin(2*pi*220*H); BQ= sin(2*pi*493.88/2*Q); DBQ=sin(2*pi*277.18*Q); DDQ = sin(2*pi*293.66*DQ_time); DQ = sin(2*pi*293.66*Q); EEN =sin(2*pi*329.63*EN); GBQ=sin(2*pi*369.99*Q); GQ=sin(2*pi*392*Q); GEN=sin(2*pi*392*EN); FEN= sin(2*pi*349.23*EN); GBEN=sin(2*pi*369.99*EN); notes= [AH BQ DBQ DDQ EEN GBQ GBQ GQ GEN GEN DQ EEN FEN GBEN]; sound (notes,1/delta); wavwrite(notes,1/delta,32,'music-a.wav'); % PART B %half the duration %we will hear the some plays at twice speed as before delta = 0.0005; H=0:delta: 0.5; Q=0:delta:0.25; DQ_time=0:delta:0.375; EN=0:delta:0.125; AH = sin(2*pi*220*H); BQ= sin(2*pi*493.88/2*Q); DBQ=sin(2*pi*277.18*Q); DDQ = sin(2*pi*293.66*DQ_time); DQ = sin(2*pi*293.66*Q); EEN =sin(2*pi*329.63*EN); GBQ=sin(2*pi*369.99*Q); GQ=sin(2*pi*392*Q); GEN=sin(2*pi*392*EN); FEN= sin(2*pi*349.23*EN); GBEN=sin(2*pi*369.99*EN); notes= [AH BQ DBQ DDQ EEN GBQ GBQ GQ GEN GEN DQ EEN FEN GBEN]; sound (notes,1/delta); wavwrite(notes,1/delta,32,'music-b.wav'); % PART C %Change the duration back to part a delta = 0.0005; H=0:delta: 1; Q=0:delta:0.5; DQ_time=0:delta:0.75; EN=0:delta:0.25; %as we replace t with 2t,so double the time in signal function %which also means double the frequency of each signal %we will hear a song with higher pitch AH = sin(2*pi*2*220*H); BQ= sin(2*pi*2*493.88/2*Q); DBQ=sin(2*pi*2*277.18*Q); DDQ = sin(2*pi*2*293.66*DQ_time); DQ = sin(2*pi*2*293.66*Q); EEN =sin(2*pi*2*329.63*EN); GBQ=sin(2*pi*2*369.99*Q); GQ=sin(2*pi*2*392*Q); GEN=sin(2*pi*2*392*EN); FEN= sin(2*pi*2*349.23*EN); GBEN=sin(2*pi*2*369.99*EN); notes= [AH BQ DBQ DDQ EEN GBQ GBQ GQ GEN GEN DQ EEN FEN GBEN]; sound (notes,1/delta); wavwrite(notes,1/delta,32,'music-c.wav');
