One of the factors that should be considered in determining how wide a transmission band is required for high fidelity broadcasting is the ability of people to perceive the effects of restricting the band to various limits, when listening to typical radio programs.—Tests are described in which this was directly measured. The tests were concerned only with the physical ability to hear the differences in band width and disregarded the question of the enjoyment or aesthetic appreciation of wider bands. It is concluded that changes in band width are detectable about twice as readily with music as with speech; that one must go from 8 to 15 kc. to obtain a change as readily detected as a change from 5 to 8 kc; and that both these changes, for speech, are just sufficient to have an even chance of being detected by listeners having experience in such tests.
A communication system for the pick-up and reproduction in auditory perspective of symphonic music must be designed properly with respect to the acoustics of the pick-up auditorium and the concert hall involved. The reverberation times and sound distribution in the two auditoriums/ the location of the microphones and loud speakers, and the response-frequency cali bration of the system and its equalization are considered. These and other impor tant factors entering into the problem are treated in this, the sixth and final paper of the symposium.
A communication system for the pick‐up and reproduction in auditory perspective of symphonic music must be designed properly with respect to the acoustics of the pick‐up auditorium and the concert hall involved. The reverberation times and sound distribution in the two auditoriums, the location of the microphones and loud speakers, and the response‐frequency calibration of the system and its equalization are considered. These and other important factors entering into the problem are treated in this paper.
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