Most human perception is logarithmic. A change in OVERALL LOUDNESS of
about 10 dB is perceived as twice (or half) as loud.
Changes in SIGNAL TO NOISE RATIO as small as 1 dB can be the difference
between copy or not. This is true for music as well as speech or CW.
When mixing live sound with multiple mics on instruments and voices,
once balance is achieved, very small changes in the gain for any mic are
usually required to stay in balance.
73, Jim K9YC
On 12/13/2018 9:16 AM, Dauer, Edward wrote:
A very unpleasant dinner last night at a restaurant with a reported
noise level of 84 db – about the same as a gas engine lawn mower
seated at the next table – raised what is probably an elementary
question. 3 db is the familiar doubling of power, and in an audio
environment is a doubling of acoustic energy, I understand. However,
I have read that ten db is what results in an apparent doubling of the
sound level as we hear it. Is the difference attributable to
something like an AGC circuit in the human auditory system? And as
for RF transmitter power, does it take a ten db increase rather than 3
to effect an apparent doubling of audio amplitude in the ears on the
other end of the QSO? Never mind the S meter – I mean the actual
ability to hear a signal over the noise, or over the QRM. Help, anyone?
Ted, KN1CBR
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
