She trembled as my hands moved to each new spot.I slid a hand between her legs up over her now smooth mound. The same, but oh so magnificently different. I let my hand rest there feeling nothing but skin as I slipped my thumb in between her folds and pressed deep. Kathy let out the long breath she must have been holding forever. Her body visibly shuddered and she relaxed slightly as I gently moved inside of her. I left my thumb deep in her as I pulled her closer to me and began exploring her with my mouth. I rotated my hand slightly so with effort my tongue could penetrate her. I prodded her sensitive opening with my tongue, entering her slightly before drawing up toward her already swollen clit. I circled that magnificent point of sensitivity, fully engaging it with my tongue. It was then that I felt Lisa’s weight on the bed and her little fingers joining mine between my wife’s legs. My wife felt her too and the gentle, radiating pleasure that we had created, spiked to an all over. “Now, it was determined that for a typical voice signal to be intelligible, the range of frequencies needed are only three hundred hertz to three point four kilohertz. So to squeeze more voice circuits onto a broadband trunk circuit, they restrict the frequencies with a bandpass filter,” I said. “Now, if we want to modulate our digital signal, in a process called ‘frequency shift keying’, we choose different frequencies for a logical zero and logical one. We need to make sure the frequencies we choose will pass through that filter”“But why go to all that trouble?” another student asked. “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.
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