System object: comm.FMBroadcastModulator
Package: comm
Apply FM broadcast modulation
modSig = step(fmbMod,audioSig)
modSig = step(fmbMod,audioSig,rbdsSig)
Note
Starting in R2016b, instead of using the step method
to perform the operation defined by the System object™, you can
call the object with arguments, as if it were a function. For example, y
= step(obj,x) and y = obj(x) perform
equivalent operations.
modSig = step(fmbMod,audioSig) pre-emphasizes
the audio signal, audioSig, and modulates it onto
a baseband FM signal. The audio signal can be real or complex with
a single-precision or a double-precision data type. If the Stereo property
of fmbMod is set to true, stereo
encoding is performed after pre-emphasis and the audio signal must
have at least two channels. If Stereo is false,
the audio signal must be a column vector. The length of the modulated
signal, modSig, is (SampleRate/AudioSampleRate) × length(audioSig).
modSig = step(fmbMod,audioSig,rbdsSig) also
modulates a baseband RBDS signal at 57 kHz. You can pass rbdsSig as
an input only if you set the RBDS property to
true. The length of output vector modSig is (SampleRate/AudioSampleRate) × length(audioSig).
Note
fmbMod specifies the System object on
which to run this step method.
The object performs an initialization the first time the step method
is executed. This initialization locks nontunable
properties and input specifications, such as dimensions, complexity,
and data type of the input data. If you change a nontunable property
or an input specification, the System object issues an error.
To change nontunable properties or inputs, you must first call the release method
to unlock the object.