FM, also known as frequency modulation, was invented by Edwin Howard Armstrong in 1933 to overcome the problem of radio-frequency interference, which plagued AM radio reception.
FM, nke a makwaara dị ka mgbanwe mgbanwe ugboro ugboro, bụ Edwin Howard Armstrong chepụtara na 1933 iji merie nsogbu nke nnyonye anya ugboro ugboro na redio, bụ nke mere ka nnweta redio na redio.