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absorption acoustic power alternating current amplitude antenna apparatus audience auditorium average power basilar membrane Bell Laboratories binaural circuit cochlea complex sound components corresponding curve cycles per second decibels device diaphragm distortion eardrum effect electrical ear electro-acoustical electrons engineer equally loud equipment Figure film filter fundamental hall harmonics hearing helicotrema higher human ear increase input instruments intensity interval larynx listener loudness level loudspeaker magnetic masking measurements ment method microphone microwatt minimum perceptible mirror modulation molecules monaural motion musical tones musician natural vibrations noise level octave operation orchestra oscillators oscillographic oscilloscope output overtones pattern peaks percent phonograph piano picked pitch possible power level pressure produce pure tone Pythagoras quency radio range of frequencies ratio receiver recording reproduced result reverberation scale sensation sinusoidal sound wave speech string studio telephone threshold of audibility tion translating transmission transmitted tube vacuum variations vibrations voltage Weber-Fechner law wire