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An Introduction to Research in the Com
Researches in Speech and Hearing
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alkali metal amplifier antenna average power broadcasting called carry communica communication channel communication system connection cost cycles per second cylinder device diphthong disc distance electrical communication electrical currents electrical impulses electrical signals elements ether waves field film frequency band fricative consonants HARVEY FLETCHER hear human HYBRID COIL intensity knowledge laboratory larynx long-wave magnetic material means messages methods mission motion picture munication nerve octave operation optic nerve organization original oscillograph phonograph photo-electric cell picture transmission system pitch possible present problems produced quency radio-telephone receiving apparatus receiving end requirements research and development ribbon rotating scanning sending end short-wave shown in Figure sideband sound waves speech currents speech sounds speed spoken spot of light stop consonants talking pictures tele telegraph telephone circuits telephone lines television things tion tone trans trans-oceanic transmitted vacuum tube variations vibration voice currents vowel wire word