White Noise for Sleeping in Hotels | Block Out Hallway Noise | 10 Hours Black Screen

▶ More like this:    • Black Screen Sleep Sounds — 8 to 10 Hours   For hotel rooms, where the noise is coming from a corridor you cannot do anything about. Nothing in this was recorded. All three layers are generated, which means this exact sound does not exist anywhere else, and there is no room tone, no traffic, no aircon compressor kicking in at 3am that came along with a recording. Pure white noise has equal energy at every frequency, which sounds harsh after about twenty minutes — all treble and no body. So the top is rolled off above 9kHz, and a pink noise layer sits underneath it to give the middle some weight. A third layer covers everything below 250Hz, which is the part that actually does the work against footsteps in a hallway and voices through a wall. Low frequencies pass through doors. That is why you can hear the conversation but not the words. Measured range across ten hours is 1.6 LU. Masking only works if it does not dip. 10 hours. Black screen. No music, no talking.