Audiowrite clipping warning issue..

Hey all,

Part of my program is creating a melody of various sine waves and this all works as it should. It also saves the melody as a wav using audiowrite. When it saves, in the command line, i get orange warnings saying the signal clipped a bit.

Here's part of my code for the melody creation:

    % CREATE A LOW PASS FILTER TO AVOID CLICKS IN THE FULL MELODY..
    LPfiltX=designfilt('lowpassfir', 'PassbandFrequency', 1000, 'StopbandFrequency', 1100, 'PassbandRipple', 1, 'StopbandAttenuation', 60, 'SampleRate', Fs);

    % FOR: LOOP THROUGH THE 7 USER CHOSEN NOTES..
    for i = 1:7;
        tX = 0:1/Fs:1; % TIME..
        f = out(i); % FREQUENCY..
        SineZ{i} = sin(2*pi*f*tX); % CREATE SINE WAVE..
    end
    % END FOR..

    % CONCATENATE SINEZ ARRAY INTO ONE VARIABLE..
    Wave = cell2mat(SineZ); % CONCATENATE VECTORS..
    t_p = linspace(0, length(Wave), length(Wave)); % CREATE MATCHING TIME VECTOR..

% FILTER THE MELODY WITH THE LP FILTER..
MyOPfiltCREATE=filter(LPfiltX,Wave);

Here's the orange warning text:

Warning: Data clipped when writing file. 
> In audiowrite>clipInputData (line 396)
  In audiowrite (line 176)
  In EPM_gui_form>btSAVEWAV_Callback (line 269)
  In gui_mainfcn (line 95)
  In EPM_gui_form (line 33)
  In matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)EPM_gui_form('btSAVEWAV_Callback',hObject,eventdata,guidata(hObject))

Is there any way to stop it clipping. Can i assign a maximum amplitude to the melody (signal) or apply a filter or something at the creation stage to keep the signals below a certain level?

Any ideas?

Thanks,

Paul..

Answer 1

[Walter Roberson]

http://www.mathworks.com/help/matlab/ref/audiowrite.html#input_argument_y

The valid range for the data in y depends on the data type of y. 
   double    -1.0 ≤ y ≤ +1.0

If you data is out of that range you should divide it by max( abs(YourData(:)) )