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demo_blockproc_slidingsgram.m    60 lines (45 with data), 1.4 kB

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function demo_blockproc_slidingsgram(source,varargin)
%DEMO_BLOCKPROC_SLIDINGSGRAM Basic real-time rolling spectrogram visualization
% Usage: demo_blockproc_slidingsgram('gspi.wav')
%
% For additional help call |demo_blockproc_slidingsgram| without arguments.
%
% This demo shows a simple rolling spectrogram of whatever is specified in
% source.
if demo_blockproc_header(mfilename,nargin)
return;
end
% Basic Control pannel (Java object)
p = blockpanel({
{'GdB','Gain',-20,20,0,21},...
});
% Basic sepctrogram figure (Java object)
fobj = blockfigure();
%
bufLen = 1024;
% Setup blocktream
fs=block(source,varargin{:},'loadind',p,'L',bufLen);
% Using dgtreal with 20ms hann window, hop factor 80, 1000 channels.
% Redundancy factor 12.5
winLenms = 30;
a = 80;
M = 1000;
F = frame('dgtreal',{'hann',floor(fs*winLenms/1e3)},a,M);
F = blockframeaccel(F, bufLen,'segola');
flag = 1;
%Loop until end of the stream (flag) and until panel is opened
while flag && p.flag
% Obtain the global gain value
gain = blockpanelget(p,'GdB');
gain = 10^(gain/20);
% Read the next block of samples
[f,flag] = blockread();
f=f*gain;
% Do analysis using the specified frame.
c = blockana(F, f);
% Draw the first channel coefficients
blockplot(fobj,F,c(:,1));
% Enqueue to play
blockplay(f);
end
blockdone(p,fobj);