Input arguments must be 'double'

Hi, I'm doing a speech recognition code with neural networks fot the purpose of doing voice commands. When I try to determine the coefficients of a forward linear predictor with LPC function it gives me this error : "Input arguments must be 'double'". Parte of the code I have is

 for i= 1:1:samp 
fprintf('say AHEAD immediately after hitting enter');
input('');
x= audiorecorder(Fs, 16,2);
[s(i,:),g] = lpc(x,12); % 12+1 features
%plot(s(i,:));
end

Can anyone help me?

[Guillaume]

What is F ?

[David Costa]

Hi Guillaume, thank you for the answering. I forgot to say that F is the audiorecorder.

Answer 1

[Guillaume]

If x is an audiorecorder object it's no wonder you get this error. You need to use the object to actually record and then get the recorded data, something like

recorder = auiorecorder(Fs, 16, 2);
input('say AHEAD immediately after hitting enter');
recorder.recordblocking(2);  %to record for 2 seconds
[s(i, i), g] = lpc(recorder.getaudiodata, 12);

Answer 2

[Ritikh Deo]

clc;

close all;

clear all;

Fs=8000;

Nseconds = 1;

samp=6;

words=5;

for i= 1:1:samp

fprintf('say AHEAD immediately after hitting enter');

input('');

recorder = audiorecorder;%(Fs, 16, 1);

recordblocking(recorder,2); %to record for 2 seconds

s(i,:)= (getaudiodata(recorder));

%[s(i, :), g] = lpc(getaudiodata(recorder));

%x= wavrecord(Nseconds*Fs,Fs,'double');

%[s(i,:),g] = lpc(x,12); % 12+1 features

%plot(s(i,:));

end

for i= (samp+1):1:2*samp

fprintf('say STOP immediately after hitting enter');

input('');

recorder = audiorecorder(Fs, 16, 1);

recordblocking(recorder,2); %to record for 2 seconds

s(i,:)= (getaudiodata(recorder));

%[s(i, :), g] = lpc(getaudiodata(recorder));

%x= wavrecord(Nseconds*Fs,Fs,'double');

%[s(i,:),g] = lpc(x,12); % 12+1 features

%plot(s(i,:));

end

for i= (2*samp+1):1:3*samp

fprintf('say BACK immediately after hitting enter');

input('');

recorder = audiorecorder(Fs, 16, 1);

recordblocking(recorder,2); %to record for 2 seconds

s(i,:)= (getaudiodata(recorder));

%[s(i, :), g] = lpc(getaudiodata(recorder));

%x= wavrecord(Nseconds*Fs,Fs,'double');

%[s(i,:),g] = lpc(x,12); % 12+1 features

%plot(s(i,:));

end

for i= (3*samp+1):1:4*samp

fprintf('say LEFT immediately after hitting enter');

input('');

recorder = audiorecorder(Fs, 16, 1);

recordblocking(recorder,2); %to record for 2 seconds

s(i,:)= (getaudiodata(recorder));

%[s(i, :), g] = lpc(getaudiodata(recorder));

%x= wavrecord(Nseconds*Fs,Fs,'double');

%[s(i,:),g] = lpc(x,12); % 12+1 features

%plot(s(i,:));

end

for i= (4*samp+1):1:5*samp

fprintf('say RIGHT immediately after hitting enter');

input('');

recorder = audiorecorder(Fs, 16, 1);

recordblocking(recorder,2); %to record for 2 seconds

%[s(i, :), g] = lpc(getaudiodata(recorder));

%x= wavrecord(Nseconds*Fs,Fs,'double');

%[s(i,:),g] = lpc(x,12); % 12+1 features

%plot(s(i,:));

end

% for i= (5*samp+1):1:6*samp

%

% fprintf('say sLOW immediately after hitting enter');

% input('');

% x= wavrecord(Nseconds*Fs,Fs,'double');

% [s(i,:),g] = lpc(x,12); % 12+1 features

% plot(s(i,:));

% end

%

% for i= (6*samp+1):1:7*samp

%

% fprintf('say SPEED immediately after hitting enter');

% input('');

% x= wavrecord(Nseconds*Fs,Fs,'double');

% [s(i,:),g] = lpc(x,12); % 12+1 features

% plot(s(i,:));

% end

S=zeros(1,13);

for i=1:1:samp

S=cat(1,S,s(i,:));

S=cat(1,S,s(samp+i,:));

S=cat(1,S,s(2*samp+i,:));

S=cat(1,S,s(3*samp+i,:));

S=cat(1,S,s(4*samp+i,:));

% S=cat(1,S,s(5*samp+i,:));

% S=cat(1,S,s(6*samp+i,:));

end

S(1,:)=[];

%S=[s(1,:);s(17,:);s(33,:); s(2,:);s(18,:);s(34,:); s(3,:);s(19,:);s(35,:); s(4,:);s(20,:);s(36,:); s(5,:);s(21,:);s(37,:); s(6,:);s(22,:);s(38,:); s(7,:);s(23,:);s(39,:); s(8,:);s(24,:);s(40,:);s(9,:);s(25,:);s(41,:);s(10,:);s(26,:);s(42,:);s(11,:);s(27,:);s(43,:);s(12,:);s(28,:);s(44,:);s(13,:);s(29,:);s(45,:);s(14,:);s(30,:);s(46,:);s(15,:);s(31,:);s(47,:);s(16,:);s(32,:);s(48,:)]; %48 X 13 matrix

save speechp.mat S