Present-day television audio technique often requires that a small microphone be placed near the performer or even be worn by him. The mechanical and acoustical requirements of such a microphone differ from those of a conventional dialogue microphone. Real voice measurements employing an integrating audiospectrometer are used to indicate the nature of the frequency response characteristic required by a chest microphone to provide a normal overall balance. Some market variations in the speech spectra at different points on the chest are observed. The new RCA BK-6A microphone is desinged especially for use as a chest microphone. It is intended for -informal,- -off-mike- use as contrasted with the -formal- manner of address customary with microphones of the type common in AM broadcasting and in recording practice. Real voice spectrograms of this microphone and of the RCA 77-D microphone are presented, showing the similarity in overall speech balance obtained.
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