Generating a sequence of tones

I am trying to generate a sequences of tones (of a standard frequency and duration) separated by a standard interval. For example, a series of 5 tones (1000 Hz, 1 sec.) with an interval of 2 seconds between the onset of each tone. What is the best way to go about this?

Answer 1

[Star Strider]

This works:

Fs = 8192;                          % Default Sampling Frequency (Hz)
Ts = 1/Fs;                          % Sampling Interval (s)
T = 0:Ts:(Fs*Ts);                   % One Second
Frq = 1000;                         % Tone Frequency
Y = sin(2*pi*Frq*T);                % Tone
Y0 = zeros(1, Fs*2);                % Silent Interval
Ys = [repmat([Y Y0], 1, 4) Y];      % Full Tone With Silent Intervals
soundsc(Ys,Fs);                     % Play Sound

[Kelsey S.]

Thanks for your response! I'm getting an error message after: Ys=[repmat([Y Y0],1,4)Y]; It says "Unexpected Matlab expression". Any idea what I might be doing wrong here?

[Star Strider]

My pleasure!

It could be version problems, since it worked perfectly for me in R2014b. I don’t remember when repmat was introduced.

If all else fails, just brute-force it:

Ys = [Y Y0 Y Y0 Y Y0 Y Y0 Y];

[Kelsey S.]

It worked! I'm working off of 2014a (Student version) , that must have been the issue. Thanks again!

[Star Strider]

My pleasure!

I’m glad it worked. The repmat glitch still mystifies me.

[Image Analyst]

repmat() has been around for hundreds of years, if not millennia. He's missing a space or comma after the right parenthesis in

Ys=[repmat([Y Y0],1,4)Y];

[Star Strider]

I would agree, except that my original code (as posted, with the space, and correctly formatted in my Answer) worked without error when I ran it. I always test my code if possible before I post it, or clearly label it as untested. Perhaps a comma would have made it more robust, but it works as posted. Copy, paste, run.