The same mirrored line is in fact present in hrec, but at 6 kHz (see attached figure). Since DARM is sampled at 10kHz, this gets aliased at 4kHz.
The origin of this line is still unknown, but most probably it is at 6 kHz rather than 4kHz.
The same mirrored line is in fact present in hrec, but at 6 kHz (see attached figure). Since DARM is sampled at 10kHz, this gets aliased at 4kHz.
The origin of this line is still unknown, but most probably it is at 6 kHz rather than 4kHz.