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Frequency Modulation (or FM) synthesis is a simple and powerful method for creating and controlling complex spectra, introduced by John Chowning of Stanford University around 1973. In its simplest ...

The general case of two modulating tones is mainly considered, and the amplitudes of the various frequency components appearing at the output of an ideal envelope detector are evaluated, including ...

The use of various forms of carrier reduction, to save electricity in AM transmission, is known technically as MDCL, for modulation-dependent carrier level. It has taken off both internationally and ...

In a semiconductor illuminated by a strong terahertz (THz) field, optically excited electron–hole pairs can recombine to emit light in a broad frequency comb evenly spaced by twice the THz frequency.

Amplitude modulation, or AM, is probably the simplest method of getting a voice or some music onto a radio signal and then sending that signal off to some far distant place. Because of that simplicity ...

Xperi and several U.S. broadcast groups are pushing back against an effort to modify the FCC’s order allowing asymmetric digital sidebands. In September the commission allowed most FM stations to ...