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Gear / Technical Help => Microphones & Setup => Topic started by: johnferrier on December 02, 2010, 12:48:21 AM
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re: EM172
Max input sound level = 122 dB
self noise = 14 dB
(delta of 108 dB)
Yet, the rated signal to noise ratio is only 80 dB.
What is S/N, if not the difference between max input and the self noise?
Thanks, in advance, for relevant information.
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re: EM172
Max input sound level = 122 dB
self noise = 14 dB
(delta of 108 dB)
Yet, the rated signal to noise ratio is only 80 dB.
What is S/N, if not the difference between max input and the self noise?
Thanks, in advance, for relevant information.
SNR = 94dB - self noise (dB)
94dB is 1Pa which is the standard sound pressure level used.
Noise is measured in dBA (A weighting of spectrum).
You're right in a sense, if you allow louder sound levels, the effective SNR is increased. In reality, SNR is the difference between the maximum sound level *you measure* and the self noise of the mic. So, for quieter sources, your effective SNR will be less than the quoted number.
Richard
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SNR = 94dB - self noise (dB)
94dB is 1Pa which is the standard sound pressure level used.
That's what I was missing. Thanks, so much Richard!