This video tutorial shows how to modulate a carrier signal with a real speech signal from a text file to produce a DSB-SC signal using Cadence Orcad Capture + PSPICE simulation. In this modulation, the AD633 analog multiplier is used to obtain DSB-SC signal. The speech text file for this example is provided below and it is used in the circuit schematic using the VPWL_F_RE_FOREVER signal source as shown in the video. The carrier frequency used is 100KHz. The DSB-SC signal waveform and the spectrum is viewed. The designed circuit can be further processed to produce a printed circuit board.
Video: DSB-SC Modulation with real speech signal using Cadence Orcad Capture
Speech text file is below for download:
http://www.filefactory.com/file/58683www192n/n/speech.txt
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