B2.3 The method used to hide the signal specifies that the carrier frequency changes at a
regular interval. Identify the number of carrier frequencies and store this in N. Using
N and the total duration of the signal, determine the interval (in seconds) at which the
carrier switches and store this in stream. Carrier frequencies will not repeat in the signal
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you are provided.
B2.4 Create a matrix streams, where each row of streams contains a stream second interval
of hiddenSignal – that is, row 1 contains the time interval [0, Tstream), row 2 contains
the time interval (stream, 2 • Tstream), and so on. The number of rows of streams
should match the number of carriers.
B2.5 Compute the row-wise Fourier transform of streams, and store it in STREAMS. Create
a time vector t1 and frequency vector k1 suitable for plotting the rows of streams and
STREAMS, respectively. Plot the time domain from streams and magnitude spectrum from
STREAMS of every interval in separate subplots.
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