Adding duration in second as x axis

I have recorded and saved the sound signal and now would like to recreate the plot same as displayed using dsp.timeScope object.

plot(duration,data)

I have tried duration = start:step:end but it ended up having an extra 1 more data point in duration.(Must start with 0 not 1) Is there anyway to overcome this problem? Sampling rate is 44100Hz

Answer 1

[dpb]

Don't alias the builtin duration; that will create problems working with time objects.

You don't really want a duration, you just want sampled time.

dt=1000/44100;          % sampling time, ms
N=(length(data);        % number samples in record
T=(length(data)-1)*dt;  % sample time, ms
t=linspace(0,T,N);      % make the time vector match the size of the data stream
plot(t,data)            % plot, axis will be in msec; adjust xlim, xtick as wanted

If you really, really wanted to use one of the fancier ML features, use a timeseries

[masnoob]

Thanks a lot !