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“Why not just send the digital data directly down the line?”“It’s all to do with that bandpass filtering,” I said. “Imagine we have a sequence of zeros and ones, so we would be sending what would be a square wave. Has everyone heard of Fourier synthesis?” Everyone nodded their heads. “So you know that a square wave actually consists of a combination of harmonic sine waves, like this.”I put up a transparency on the overhead projector, showing how a harmonic series of sine waves combine to produce a square wave.“Now, because of the high frequency cut off, if our data rate is too high, then that square wave will become distorted, and the receiving end may not detect state transitions properly. If, however, we modulate the digital signal in this FSK manner, provided our choice of modulation frequencies is below that 3.4kHz cutoff frequency, we don’t have that problem. All that is required is to demodulate the FSK signal at the receiving end, and we have our original digital signal.. "What's going on Michael? And where's Catherine?"I just nodded my head at Catherine who was standing behind her. Anna turned to look, but stopped as she stared at the young woman looking back at her."Catherine?" she exclaimed. "What has happened to you? You look twenty years younger!"Catherine just looked at me as she arched a single eyebrow. I could feel the 'I-told-you-so' in her expression."I thought I would try to repair some of the damage around her eyes. You know, remove a few wrinkles and such. But I may have gone a bit too far," I explained."I'll agree that it looks like you went overboard," Anna said. "Just out of curiosity, how long did it take to do all that?"I looked to Catherine, unsure how to answer Anna's question. When I'm doing it, I tend to lose track of time."I'd say less than five minutes, but I didn't actually put a stopwatch on him," Catherine replied."You did all that in under five minutes?" Anna responded in disbelief. "I figured you were going to tell me it.
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