. Elements of acoustical engineering. Electro-acoustics; Sound. PICKUP COIL ./VOICE CONE f COIL MICROPHONE/. ^ Fk5. Loud speaker and amplifier feedback systems. A. The output of the pickup coil is fed into the input side of the amplifier. B. The output of the microphone is fed into the input side of the amphfier. The graph shows the pressure response characteristics of system A: 1. without feedback, 2. with feedback, 3. with feedback and compensation. to employ feedback in this way because of the very special control required of phase shifts in the amplifier and loud speaker system. Unle
. Elements of acoustical engineering. Electro-acoustics; Sound. PICKUP COIL ./VOICE CONE f COIL MICROPHONE/. ^ Fk5. Loud speaker and amplifier feedback systems. A. The output of the pickup coil is fed into the input side of the amplifier. B. The output of the microphone is fed into the input side of the amphfier. The graph shows the pressure response characteristics of system A: 1. without feedback, 2. with feedback, 3. with feedback and compensation. to employ feedback in this way because of the very special control required of phase shifts in the amplifier and loud speaker system. Unless certain phase relations ^-^ are maintained, oscillation will occur. Figure shows feedback applied to an amplifier and loud speaker. In Fig. 1 .WA a pick- up coil is attached to the cone. The output from the pickup coil is fed into the input of the amplifier out of phase with the signal input. The response characteristic of the amplifier loud speaker without feedback is shown in Fig. The same loud speaker and amplifier with 15 db nega- tive feedback from the pickup coil are also shown in Fig. It will be «Nyquist, H., Bell Syst. Tech. Jour., Vol. 11, No. 1, p. 126, 1932. 9 Black, H. C, Bell Syst, Tech. Jour., Vol. 13, No. 1, p. 1, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Olson, Harry Ferdinand, 1901-. New York, D. Van Nostrand company, inc.
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