In 1915, an American named E. S. Pridham put a telephone listener at the time on a horn that played a record sound, and when the sound could be heard by a group of people celebrating Christmas in San Francisco, electroacoustics was born. When the First World War ended, at the inauguration of President Harding of the United States, the Bell Company of the United States connected the dynamic receiver of the telephone to the horn of the record player at the time, and the sound was transmitted to watch the inauguration of the president. A large group of people at the ceremony produced a lot of professional sound research and development of the science of sound reinforcement engineering. Sound researchers are not simply trying to improve sound equipment, but also doing various experiments on different sound to understand the human response to hearing. But the most advanced acoustic researchers all understand that acoustics is a holistic study. They have to understand every aspect of audio equipment and the physiological response of humans to hearing. They have made a great contribution.
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