DocumentCode
1262621
Title
On the sibilance problem in FM sound transmission
Author
Lourens, J.G.
Author_Institution
Dept. of Electr. & Electron. Eng., Stellenbosch Univ., South Africa
Volume
37
Issue
3
fYear
1991
fDate
9/1/1991 12:00:00 AM
Firstpage
115
Lastpage
120
Abstract
An explanation for the sibilant distortion on FM sound transmissions is given. According to the proposed model, the effect is due to an overmodulation of the FM carrier, where the instantaneous frequency is proportional to the modulating signal. Pre-emphasis makes the effect worse, and the broadcast peak program meters (PPMs) do not indicate peaks in random signals. The explanation is backed up by simulation results and circumstantial evidence. A solution to the problem is offered: by clipping the signal after pre-emphasis the chances of overmodulation can be minimized
Keywords
detector circuits; electric distortion; frequency modulation; limiters; meters; noise; radio broadcasting; FM sound transmission; broadcast peak program meters; carrier overmodulation; instantaneous frequency; modulating signal; pre-emphasis; sibilant distortion; signal clipping; Acoustic noise; Acoustical engineering; Amplitude modulation; Broadcasting; Filters; Frequency modulation; Gaussian noise; Noise level; Radio frequency; TV;
fLanguage
English
Journal_Title
Broadcasting, IEEE Transactions on
Publisher
ieee
ISSN
0018-9316
Type
jour
DOI
10.1109/11.99091
Filename
99091
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