Original sentence: Audio frequency-shift keying (AFSK) is a modulation technique by which digital data is represented by changes igggggggggggn the frequency (pitch) of an audio tone, yielding an encoded signal suitable for transmission via radio or telephone
Edited sentence: Audio frequency-shift keying (AFSK) is a modulation technique by which digital data is represented by changes in the frequency (pitch) of an audio tone, yielding an encoded signal suitable for transmission via radio or telephone