A method is presented of remote-controlling the polar pattern of a condenser microphone which has standard phantom powering and the usual 3-pin XLR connector found in all studios. Remote control is affected with a stepping switch in P 48 power unit, which imposes the control information on the modulation leads. An interpretation circuit in the microphone senses the information in the remote position and selects the required polar pattern.
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https://aes2.org/publications/elibrary-page/?id=6572
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