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Entries found for search: FM

AFM : (1) Audio Frequency Modulation. A processing scheme used for recording high-quality analog audio in videocassette recorders equipped with "Hi-fi" stereo audio. (2) American Federation of Musicians. The union that represents professional musicians in all their client and employer relations.

EFM : Eight-to-Fourteen Modulation. The data encoding scheme used in CDs in order to optimize the process of reading off the disk. Groups of eight data bits are regrouped into fourteen-bit blocks by EFM modulator during cutting of the CD master, permitting about 25% greater data density to be laser-inscribed on the disc and allowing easier error recognition. An EFM demodulator in the CD player decodes the data.

FM sync : The 13.5kHz frequency-modulated sync pulse recorded on Nagra IV-S recorders.

FM synthesis : A sound synthesis technique which multiplies sine waves together in an attempt to generate complex waveforms more quickly (than additive synthesis), usuallytends to add ing several of these products together in an attempt to get its more effective results, which is why a 6-operator FM sounds better than a 4-operator FM as more products are being summed. See sound synthesis.

frequency modulation (FM) : (1) A change in the frequency (pitch) of a signal. At low modulation rates, FM is perceived as vibrato or some type of trill. When the modulation wave is in the audio range, FM is perceived as a change in timbre. FM synthesizers, commonly found on soundcards, create sounds using audio-range frequency modulation. See FM synthesis. (2) Frequency modulation is the instantaneous changing of the frequency of a carrier in response to a modulation signal, usually an audio waveform. As the signal voltage varies up and down as it follows the waveform, the frequency of the carrier varies up and down from its nominal unmodulated value. The FM receiver is tuned to the carrier frequency, and the received signal, after suitable conditioning, is applied to a special circuit called an FM detector, also called a demodulator or discriminator, which recovers the audio signal. See amplitude modulation.



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