In 1936, Edwin H. Armstrong demonstrated his invention of FM radio in Washington D.C. to a fact-finding investigation by the Federal Communications Commission into the future of radio and TV. His method modulated the frequency of a broadcast radio wave to carry the audio signal (FM), instead of the existing amplitude modulation (AM). Armstrong's system used a higher frequency band than existing commercial radio. It eliminated all static and outside interference. Several hundred representatives of the radio industry were present. Armstrong compared the old and new methods with a series of recordings of the same program under the different conditions. FM was clear of the hissing, buzzing and crackling static noises of AM.«