radiophony
/ˌreɪdɪˈɒfəni/ /ˌreɪdɪˈɒf(ə)ni/noun
1Originally: any of various techniques for producing or transmitting sound or electrical signals using beams of light; especially = photophony. In later use: the theory or technique of transmitting sound using radio waves; (more generally) radio broadcasting. Now historical.
2The production and use of synthetic sound effects.
Origin
Late 19th century; earliest use found in The Athenaeum. Originally from radio- + -phony, after French radiophonie. In later use from radio- + -phony.