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Signal Quality Check: Part 3/3 - Analyzing Noise Floor
• You can check for RF interference
by plotting the FFT of the Silence
Recording . This is the VA1210
noise floor.
• A clean noise floor (see
looks like a 1/f slope with a ~30dB
resonant peak at 4.5kHz.
• If there is RF interference, it can
look like sharp peaks on the noise
floor (see
red
curve at 5-6kHz).
• Bluetooth interference can be
identified by the noise frequency.
The peaks are usually multiples of
133Hz (i.e. 133Hz, 266Hz, 400Hz)
10
blue
curve)
Vesper - Confidential
VA1210 noise
recording with RF
interference
Clean VA1210 noise recording
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