Accession Number:

AD0256535

Title:

SPECTRAL ANALYSIS OF VOICE-MODULATED FM SIGNAL,

Descriptive Note:

Final rept.,

Corporate Author:

ARIZONA UNIV TUCSON APPLIED RESEARCH LAB

Personal Author(s):

Report Date:

1960-12-01

Pagination or Media Count:

30.0

Abstract:

The investigation concerns the calculation and measurement of the carrier and sideband spectrum of an electromagnetic wave when frequency modulated by a nonperiodic wave such as ordinary speech. The spectra for various deviation ratios were calculated and measured. Only the vowels and diphthongs were used for calculated spectra. The first three formant frequencies of the vowels and diphthongs used were corrected for their relative occurrence, relative time duration, and relative amplitude. The comparison of the calculated and experimental spectra indicates that the formant model of speech is valid for calculation of carrier power but is an over-simplification when applied to the frequency spectrum analysis of an FM signal. The experimental spectrum provides the carrier power relative to the unmodulated carrier power and required bandwidth estimations for narrowband voice-modulated FM. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE