how to use soundsc with function

Hi i have written a code which is executing perfectly for DTMF tones with this command. I am listening tones in speaker

dtmf=dtmfdial([1 1 9 9 2 2 0 0]);

The last portion of my code is

dtmf = cat(2, D{:});

soundsc(dtmf,12000);

Now the book says that following matlab command should play the tones corresponding to input vector,input,through computer speaker

sound(dtmfdial([input]),12000)

How can i achieve this, what should i do with my final cell dtmf???

Answer 1

[Wayne King]

Your function is actually outputting a vector. Your code

dtmf = cat(2, D{:});

is producing a vector, soundsc() works on that vector. So the line

soundsc(dtmfdial([3 7 3]),8000)

Says "call dtmfdial with the input [3 7 3] which inside your code builds a signal (the vector dtmf) out of the frequencies defined by that input vector (in table). Play the output of dtmfdial() with a sampling frequency 8,000 Hz.

[moonman]

Thanks a lot Wayne King

I have understood now

Answer 2

[Wayne King]

Is your dtmf a Nx1 cell array? Can you do

soundsc(cell2mat(dtmf),Fs)

Answer 3

[moonman]

My dtmf is

1x38416 double

When i run ur command i get this error

>> soundsc(cell2mat(dtmf),fs) ??? Cell contents reference from a non-cell array object.

Error in ==> cell2mat at 43 cellclass = class(c{1});

But the book is asking very strange command

sound(dtmfdial([input]),12000)

Is it possible???

Answer 4

[Wayne King]

Transpose your cell array

dtmf = dtmf';

Then try

soundsc(cell2mat(dtmf),8000);

Answer 5

[moonman]

I think Wayne u r not getting the issue

this code is perfect and running fine

I am stuck to use this command

*The book says that following matlab command should play the tones corresponding to input vector,input,through computer speaker

sound(dtmfdial([input]),12000)*

Is it Possible

Answer 6

[moonman]

Thanks Wayne King I did not check the command and assumed it will not work but it worked without any change

but can u kindly explain me how does it work

soundsc(dtmfdial([3 7 3]),8000)

what i understand the soundsc command calls dtmfdial function

but how tone is generated, the tone is actually in output cell array dtmf but we never told matlab to use that

Does matlab automatically pick the output of function???

[Walter Roberson]

When a function A is given as an argument to another function B, then the first output of A becomes an input to B. *Only* the first output of A is accessible when you do this: there is NO way in MATLAB to have multiple outputs of a function used as inputs to another function, other than assigning those multiple outputs to variables and passing in the variables.