Wind-Blox Performance - Based on their own audio files
A company by the name of Wind-Blox makes a wind noise reduction product that attaches to the leading straps on a cycling helmet and, as the name suggests, blocks wind. According to a recent Wind-Blox press release... '"At 80.2% noise reduction, Wind-Blox reduces the most wind noise," Since this is a very high (i.e. 'too good to be true') percentage and surprisingly 'accurate' measurement, we decided to evaluate the 'With Wind-Blox' and 'Without Wind-Blox' audio files on the Wind-Blox website. We sampled each audio file several times and produced 1/3 octave FFT's. We then converted the dB's to dB(A) values and calculated the correct loudness percent reduction.
Measurements from the Wind-Blox audio files*:
dB reduction = ~12
dB(A) reduction = ~13
Loudness Percent Reduction Calculation:
*We are happy to share the audio files if anyone wants to confirm our dB / FFT analysis.
Our analysis of the Wind-Blox audio files indicates that the correct dB(A) wind noise reduction is only 60% (±5%). In addition, it appears that the microphone they used has less than the desired full 20 - 20,000 Hz range. It also looks like the microphone captured a significant amount of false 'pseudosound'. This is a good example of audio / testing / measurement inaccuracies - leading to grossly overstated / misleading performance claims. In addition, any qualified engineer who has measured wind noise knows that tenth of percent accuracy is nonsense. So it goes.
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