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audio frequency shift keying (AFSK)

Audio Frequency Shift Keying (AFSK) is audio frequency shift keying. This shift keying differs from frequency shift keying in that the carrier frequency

is modulated with audio tones. AFSK modulation is used in the shortwave band, such as in amateur radio for radio teletype (RTTY). In this radio transmission, the carrier frequency is modulated with two tones at 1275 Hz and 1445 Hz or at 1995 Hz and 2125 Hz. The two tones represent the digital states "Mark" or "1" and "Space" or "0". Audio Frequency Shift Keying works with the modulation codesA2B and F2B, which stands for digitally transmitted information in double sideband or frequency modulation for telegraphy.

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Englisch: audio frequency shift keying - AFSK
Updated at: 07.04.2011
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Translations: DE