The Effect Of Filtering Of Side-Tone Upon Speaker Intelligibility

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Abstract
Speakers (24) read 2 intelligibility tests under 6 conditions of low-pass filtering of side-tone and under 6 conditions of high-pass filtering of side-tone. The listeners served in panels with a minimum of 12 listeners responding to each speaker. The side-tone cut-off frequencies for high-pass filtering conditions were 150, 300, 600, 900, 1200, 1500, and for low-pass 300, 600, 900, 1200, 1500, and 1800 cycles per second (cps). Mean speaker intelligibility increases with lowering of the low-pass cut-off point to 300 and 600 cps, and when the frequencies above the 600 cps were attenuated in the side-tone signal.
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