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Help with DSB-SC signal

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yuvalmaimona

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"If a ‘DSBSC’ signal had a small amount of carrier present what effect would this have as observed at the output of a synchronous demodulator?"

i think that it mean the demodulator will keep the DC part of the signal, but what does in mean exactly?
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It means that there will be a DC offset on the demodulated output that is proportional to the carrier. Asuming an IQ detector. If it is a single product dtector then the DC offset will be proportional to the carrier * the cos of the phase difference between the input and reference.
The carrier can be considered as a modulating signal at zero Hz.
 
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