Word: filteration
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Dates: during 1930-1939
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...apparatus picks up the noise to be analyzed through a microphone and passes it through an electric filter, cycles: the fundamental tone, the overtones, which produce the quality of sound, and the incidental sounds, such as the scratching of a violin...
...This filter admits into the apparatus all parts of the noise from...
Only one pitch, however, is admitted at a time. The sounds of each frequency or pitch are admitted through the filter for a small fraction of a second and deflect a spot of light, generated by a cathodes ray tube, along a horizontal line in proportion to their strength. The sport, moving back and forth as higher and higher pitched sounds with different intensities are admitted, is photographed on sensitized paper and leaves a line graph. This graph is a picture record of the noise, showing the relative loudness of each of its component parts...
...deaf person wants to regulate the fundamental tone of his speaking voice. He can only do this by regulating the "pitch." The new machine, by employing a distorting amplifier and a sound filter, can segregate and record the fundamental pitch even when it is so obscure in the original speech as to be hardly detectable by the usual instruments...
...contained. The first describes an early trans-continental flight to Australia, and it illustrates abundantly the devotion of Day Lewis to a strictly contemporary poetic diction, which takes account of the machine and the effect of machinery upon modern life. There is mention, for example, of 'petrol pump,' 'hangar,' 'filter,' 'magneto,' and other technical expressions. Dr. Johnson's strictures on this kind of poetic diction appear in his discussion of Dryden's "Annus Mirabilis," and though they posses a universal validity, they do not apply, with any exactness, to Day Lewis, for that poet has worked them into his verses...