Significance of the electro-acoustic system (ELA)
The history of electroacoustic systems (ELA) dates back to the early 1920s, when the first attempts were made to transmit sound signals via electrical cables. In the 1930s, companies such as Siemens and Telefunken began to develop ELA systems for use in public buildings, factories and other commercial facilities. However, these early systems were still quite primitive and could only transmit simple voice announcements. In the 1950s and 1960s [...]
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