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US5963849A System for using a microphone in a baseball base 失效
在棒球场使用麦克风的系统

System for using a microphone in a baseball base
摘要:
A microphone and transmitter are mounted to a baseball base such that they do not interfere with the baseball game. The microphone senses audio data and the transmitter sends the audio data to a receiver. The receiver communicates the audio data to a mixer which can insert the audio data into a television or radio signal.
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