how can i show up to 6 periods of this signal only, while being able to see the top and bottom of the wave?

(the "signal was recorded with a sampling frequency of 22050Hz)

The MATLAB code:

t = 1:length(clarinet);
plot(t,clarinet)
xlabel('index t')
ylabel('Amplitude')

Answer 1

[William Rose]

@Thabo Dube,

Nice answer from @Les Beckham.

Or, if you simply want to change the x-axis range, you can do

xlim([0 0.01]);

after the plot command. Change 0.01 to a different value, as you prefer.

If you mean "How can I automatically determine the dominant frequency, and then plot 6 cycles", I suggest you make a separate question. Good luck!

[Walter Roberson]

I notice that it is apparently a recording of a clarinet. The implication is that although there might be dominent frequences for particular periods of time, that "6 periods" of the entire unfiltered signal is probably not really defined. (The more dominent frequencies you want to deal with simultaneously, the longer the plot you would need to have 6 complete periods of the composite signal.)

Answer 2

[Les Beckham]

Check out this section of the documentation: zoom xon

This can also be done interactively but it is harder to explain. See this doc page: here