Sound Filters
OUND filters which remove certain overtones without changing the pitch of the human voice recently have been developed in America for the talking pictures, and may also be used in broadcasting. It is claimed that they eliminate certain objectionable nasal qualities and enrich thin voices.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310403.2.52
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Radio Record, Volume IV, Issue 38, 3 April 1931, Page 17
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47Sound Filters Radio Record, Volume IV, Issue 38, 3 April 1931, Page 17
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