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.
About 20 dB SPL (sound pressure level).
A whisper typically measures around 20-30 decibels.
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.