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Ratio of Frequency Swing to Phase Swing in Phase- and Frequency-Modulation Systems Transmitting Speech

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2 Author(s)
Gannett, D.K. ; Bell Telephone Laboratories, Inc., New York, N.Y. ; Young, W.R.

Computed and measured data are presented bearing on the relation between the phase and the frequency swing in phase- and frequency-modulation systems when transmitting speech. The results were found to vary with different voices, with the microphone and circuit characteristics, and with the kind of volume regulation used. With a particular carbon microphone, it was found that a phase deviation of 10 radians corresponds to a frequency deviation of between 11 and 15 kc in a phase-modulation system, and between 6 and 12 kc in a frequency-modulation system, depending on conditions.

Published in:

Proceedings of the IRE  (Volume:37 ,  Issue: 3 )

Date of Publication:

March 1949

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