1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
% Copyright David Rowe 2012
% This program is distributed under the terms of the GNU General Public License
% Version 2
%
% codec2_demo.m
% Designed as an educational tool to explain the operation of Codec 2
% for conference and user group presentations on a projector. An
% alternative to static overhead slides.
%
% Derived from codec2-dev/octave/plamp.m
%
% usage:
% octave:1> plamp("../src/hts2a",40)
%
% Then press:
% c - to cycle through the wavform being displayed on the figure
% n - next frame
% b - back one frame
%
% tip: hold down n or b to animate the display
%
% The text files used as input are generated using c2sim:
%
% /codec2-dev/src$ c2sim ../raw/hts2a.raw --dump hts2a
%
% The Codec 2 README explains how to build c2sim with dump files
% enabled.
function codec2_demo(samname, f)
sn_name = strcat(samname,"_sn.txt");
Sn = load(sn_name);
sw_name = strcat(samname,"_sw.txt");
Sw = load(sw_name);
model_name = strcat(samname,"_model.txt");
model = load(model_name);
figure(1);
k = ' ';
wf = "Sn";
do
if strcmp(wf,"Sn")
clf;
s = [ Sn(2*f-1,:) Sn(2*f,:) ];
plot(s);
axis([1 length(s) -20000 20000]);
end
if (strcmp(wf,"Sw"))
clf;
plot((0:255)*4000/256, Sw(f,:),";Sw;");
end
if strcmp(wf,"SwAm")
Wo = model(f,1);
L = model(f,2);
Am = model(f,3:(L+2));
plot((0:255)*4000/256, Sw(f,:),";Sw;");
hold on;
plot((1:L)*Wo*4000/pi, 20*log10(Am),"+;Am;r");
axis([1 4000 -10 80]);
hold off;
end
if strcmp(wf,"Am")
Wo = model(f,1);
L = model(f,2);
Am = model(f,3:(L+2));
plot((1:L)*Wo*4000/pi, 20*log10(Am),"+;Am;r");
axis([1 4000 -10 80]);
end
% interactive menu
printf("\rframe: %d menu: n-next b-back w-cycle window q-quit", f);
fflush(stdout);
k = kbhit();
if (k == 'n')
f = f + 1;
end
if (k == 'b')
f = f - 1;
end
if (k == 'w')
if strcmp(wf,"Sn")
next_wf = "Sw";
end
if strcmp(wf,"Sw")
next_wf = "SwAm";
end
if strcmp(wf,"SwAm")
next_wf = "Am";
end
if strcmp(wf,"Am")
next_wf = "Sn";
end
wf = next_wf;
end
until (k == 'q')
printf("\n");
endfunction
|
