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Subjectively a signal with smaller field strength seems to be more quiet than a better received signal with the same modulation.
Motorola Inc. September 1999
English (United States)
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Page 1 of 2
MOlOROlA Technical Developments
AUTOMATIC LOUDNESS CORRECTION AT LOW RF SIGNAL STRENGTH
by Reiner Bingel and Hans-Peter G&-tner
INTRODUCTION This noise reduces the clarity of the information signal.
Subjectively a signal with smaller field strength seems to be more quiet than a better received signal The amount of distortion depends on the fre- with the same modulation. quency spacing of the channel, the wanted tone fre- quency as well as on their relative strengths.
PROBLEM TO BE SOLVED
The audio quality is substantially reduced from annoying noise.
'I. c 80
5 60 :'p
0 10 20 30 40 50 60 70 80 90 100 110 dE3 120
Nutzschallstiirka &bar der Hiir- + schwalla Bild 12. VerstGdlichkeit in Abh%ngigkeit vom Nutzschall- schallpegel
und vom Star-
IO8 September 1999
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Page 2 of 2
Developments Technical 0 M MOTOROLA
If you have a low signal strength then you have to raise the volume level to get the same feeling of loud- ness as with high signal strength.
PROPOSED SOLUTION TO THE PROBLEM
This volume increase can be done automatically. The RSSI level may cause the microprocessor to increase the audio pa level at low RF signal strength.
Automatic Loudness Correction At Low RF Signal Strength
0 Motomla,Inc. 1999 September 1999
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