The high-pass filter attenuates incoming audio signals lower in frequency than the specified cutoff frequency. This can reduce the effects of wind noise and other low-frequency sounds on the quality of your recordings.
- Options
- 8 kHz
- Default
- 16 kHz
For every factor of two below the cutoff frequency, the audio at that frequency is
reduced in amplitude by 12 dB.
If
the high-pass filter is set to a cutoff frequency of 16 kHz, sound at 8 kHz will be
attenuated by 12 dB, and sound at 4 kHz will be attenuated by 24 dB.
Recommended High-Pass Filter Setting for Bat Monitoring
If none of your bat vocalizations of interest extend below 16 kHz, set the High-Pass Filter to 16 kHz for the best noise-reduction effects. If you need to record frequencies between 8 and 16 kHz, set the High-Pass Filter to 8 kHz.