The advent of radio broadcasting, electrical recording of disk records, and sound motion pictures all in the 1920`s stimulated the development and commercialization of high quality studio microphones as follows: The omnidirectional condenser and dynamic microphones of the 1920`s. The bidirectional velocity and omnidirectional microphones of the early 1930`s. Microphones are still classified in these three basic types of directivity. Important and significant state-of-the-art improvements have been made through the years to the present time.
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