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Extensive theoretical study and experimentation reveal that theoretical models do not approximate actual singing situations to better than the first order. Measurements of singing amplitudes, however, indicate that, in many cases, attenuation of singing must be of the order of 40 db in order to produce a useful record. Based on these observations, a system was designed using cascaded frequency-domain filters and empirically determined parameters to remove the singing-complex from tape-recorded data. Application of this system to singing records from various areas of both the eastern and western hemispheres has been spectacularly successful.
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