Substitutions in Simple Analog Modulation Example
Modification of Process
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Modifications in the Code
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Set the carrier signal's initial phase to phs, measured in radians.
| y = amodce(x,[Fs phs],'amdsb-tc');
z = ademodce(y,[Fs phs],'amdsb-tc');
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Use a lowpass filter after demodulating. num and den are row vectors that give the coefficients, in descending order, of the numerator and denominator of the filter's transfer function.
| z = ademodce(y,Fs,'amdsb-tc',0,num,den);
(For other demodulation methods, the 0 in the statement above would be unnecessary. See the reference page for ademodce for details.)
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(AM-SSB only) Use a Hilbert filter in the time domain. num and den are as above.
| y = amodce(x,Fs,'amssb/time',num,den);
z = ademodce(y,Fs,'amssb');
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(AMDSB only) Use a Costas phase-locked loop.
| z = ademodce(y,Fs,'amdsb-tc/costas');
or
y = amodce(x,Fs,'amdsb-sc');
z = ademodce(y,Fs,'amdsb-sc/costas');
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(AMDSB-TC only) Shift the signal values by offset before modulating and after demodulating.
| y = amodce(x,Fs,'amdsb-tc',offset);
z = ademodce(y,Fs,'amdsb-tc',offset);
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