11. Popular analog modulation techniques include amplitude modulation and frequency modulation . 12. His main research interests during this period were in frequency modulation and parametric oscillations. 13. Channels 1-3 must use " narrowband " frequency modulation ( 2.5 kHz deviation ). 14. In frequency modulation , amplitude variation at the microphone causes the transmitter frequency to fluctuate. 15. One of the station's listeners was the inventor of frequency modulation , Edwin Howard Armstrong. 16. Possibly his best known discovery was the wide-band frequency modulation . 17. Frequency modulation is most commonly generated at the operating frequency with the required deviation.18. The answer to both needs was wideband FM-frequency modulation . 19. FM broadcast signals also feature wide frequency modulation , hence EME reception is generally not possible. 20. The IBM PC cassette interface encodes data using frequency modulation with a variable data rate.
