Amplitude and Frequency Modulation for Facsimile Transmission and Other Applications

reportActive / Technical Report | Accesssion Number: AD1204337 | Open PDF

Abstract:

The bandwidth required for the transmission of intelligence by f-m waves is found to be as great or greater than that required by a-m transmission. The spacing of radio-frequency channels, however, is normally not a function of intelligence bandwidth, but is dependent on the rate at which the side band amplitudes decrease outside this band. When modulating functions with discontinuities are employed, the channel spacing required by frequency modulation may be less than that required by a amplitude modulation.

Author(s):
Watt, A. D.
Author Organization(s):
NAVAL RESEARCH LAB WASHINGTON DC
Funding Organization(s):
NAVAL RESEARCH LAB WASHINGTON DC, WASHINGTON , DC
Document Type:
Technical Report/Formal Report
Publication Date:
1947 Sep 01
Pagination:
55

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution Code:
A - Approved For Public Release
Distribution Statement: Public Release

RECORD

Collection: TRECMS
Identifying Numbers
Report Number(s):
NRL-FR-3154
Project Number(s):
39R01-11
Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
amplitude modulation, frequency modulation, modulation, radio frequency, channel spacing, bandwidth, frequency, amplitude, discontinuities
Keyword(s):
radio circuits, am (AMPLITUDE MODULATION), am waves, fm (FREQUENCY MODULATION), fm waves
Subject Categories:
Communications; Physics
Creation Date:
2023 Jun 26
Update Date:
2023 Sep 13