how to do wavwrite on this mat file

Hi i am having mat file which is having DTMF tones i am listening tones by this

x = load('dtmfsig.mat')   
f = fieldnames(x) 
soundsc(x.(f{1}), 8000)

Now i want to save this tone in a wave file

i know wavread command but how to use it here??

[tammna abid]

Hello there ,

i also have same problem , want to convert .mat file to .wav file with this code but unable to do so

x=load('read.mat');

wavwrite(x,8000,16,'foo.wav');

i also did the method mention below x.f{1} but of no help, pls help me out

Answer 1

[Wayne King]

fieldnames() returns a cell array. So

f = fieldnames(x);

is returning the fieldnames of x in the cell array f

x.(f{1}) is addressing the field of x that is in the first element of that cell array.

Is that what you want to write? It might be x.(f{2}), etc. depending on how the structure array is formed.

[Wayne King]

For example (this is just my example!)

x = struct('Fs',8000,'data',randn(1e3,1));

f = fieldnames(x);

x.(f{1}) % this is 8000, the sampling frequency

plot(x.(f{2})); % is the data field (the signal)

% but

x = struct('data',randn(1e3,1),'Fs',8000);

f = fieldnames(x);

plot(x.(f{1})) % this is the signal

x.(f{2}) % this is the sampling frequency

[tammna abid]

what actually 'data' here above stand for ? means data of .mat file ?, i didnt get your example above

Answer 2

[Honglei Chen]

To write a wave file, you need at least the signal and the sampling frequency. From you example, it seems you can just do

wavwrite(x.(f{1}),8000,'foo.wav')

where you can replace foo.wav to whatever the name you choose for your wav file.

HTH

[tammna abid]

Siri am having the same problem , pls figure it out where i am wrong

x=load('read.mat');

>> f=fieldnames(x);

>> wavwrite(x.(f{1}),8000,'foo.wav')

Warning: Data clipped during write to file:foo.wav

> In wavwrite>PCM_Quantize at 247

In wavwrite>write_wavedat at 267

In wavwrite at 112

>>

what these warning actually means ?

Answer 3

[moonman]

ok thanks can u kindly eexplain abt x.(f{1})

why 1 is there

[Fangjun Jiang]

It's in your code, man!

[Fangjun Jiang]

You are loading 'dtmfsig.mat'. x.(f{1}) will be the first (alphabetically) variable in the .mat file.