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| | Modulation - Wikipedia, the free encyclopedia |
 | | A device that performs modulation is known as a modulator and a device that performs the inverse operation of demodulation is known as a demodulator (sometimes detector or demod). |
 | | In the case of PSK, ASK and QAM, the modulation alphabet is often conveniently represented on a constellation diagram, showing the amplitude of the I signal at the x-axis, and the amplitude of the Q signal at the y-axis, for each symbol. |
 | | The term digital baseband modulation is synonymous to line codes, which are methods to transfer a digital bit stream over an analog lowpass channel using a discrete number of signal levels, by modulating a pulse train (a square wave instead of a sinusoidal waveform). |
| en.wikipedia.org /wiki/Modulation (1653 words) |
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