light rainfall
20 decibels
20 to 50 decibels (dB).
Twice as loud. Decibels are measured on a logarithmic scale, so an increase of 20 decibels represents a tenfold increase in intensity.
It is approx 20 decibels.
20 decibels is considered a very quiet sound, similar to a whisper or rustling leaves. It is around the noise level of a ticking watch.
20 decibles
This varies from cat to cat. I have had cats that don't purr at all and some that purr quite loudly. I would not be surprised if my current kitten purred at least 20 dB.
The decibel scale is logarithmic, with each increase of 10 decibels representing a tenfold increase in sound intensity. This means that a sound at 20 decibels is 10 times more intense than a sound at 10 decibels, and a sound at 30 decibels is 100 times more intense than a sound at 10 decibels.
A whisper typically measures around 20-30 decibels.
About 20 dB SPL (sound pressure level).
The process gain (or 'processing gain') is the ratio of the spread (or RF) bandwidth to the unspread (or baseband) bandwidth. It is usually expressed in decibels (dB).For example, if a 1 kHz signal is spread to 100 kHz, the process gain expressed as a numerical ratio would be 100,000/1,000 = 100. Or in decibels, 10log10(100) = 20 dB.
The process gain (or 'processing gain') is the ratio of the spread (or RF) bandwidth to the unspread (or baseband) bandwidth. It is usually expressed in decibels (dB).For example, if a 1 kHz signal is spread to 100 kHz, the process gain expressed as a numerical ratio would be 100,000/1,000 = 100. Or in decibels, 10log10(100) = 20 dB.