Module sounds 

Sounds to rest by or to focus with (docs/sounds.md), all made here, nothing downloaded, nothing to license, each looping without a seam (its end faded into its start):

• noise for focus: white, pink, brown; a minute each, mono;
• nature to rest by: waves on a beach, rain, wind in the trees, crickets at night, a distant storm; one to three minutes each, in stereo at 22 kHz (what they hold lies below 10 kHz, and the files stay small). Filtered noise shaped by waves, gusts and drops, and crickets’ chirps as pulsed tones, each sound seeded the same every time.

Recordings of your own are your files, in the notes’ sounds folder.

Structs

BandPass 🔒

A band-pass filter (RBJ’s cookbook, constant peak gain), its centre free to move.

Cricket 🔒

One cricket of a night: where it sits (its weight in this ear), its pitch, its rhythm.

LowPass 🔒

A one-pole low-pass filter, its cutoff free to move each sample.

Pink 🔒

Pink noise, one channel: Paul Kellett’s filter, as noise uses it.

Random 🔒

A small, seeded random source: the same noise each time.

Constants

FADE 🔒

The seam’s crossfade, in samples: two seconds.

NATURE

The sounds of nature made here.

NATURE_RATE 🔒

The sounds of nature’s rate: what they hold lies below 10 kHz.

NATURE_VERSION 🔒

Raised when the recipes change, so the files are made again (2: the noises were offset, their random source not centred; 3: crickets held in tune; 4: warmer waves).

NOISES

The noises made here.

RATE 🔒

SECONDS 🔒

Functions

add_ping 🔒

A sound that fades out quickly: a tone of frequency decaying in decay seconds, added at at with amplitude.

crickets 🔒

Crickets at night: a few field crickets chirping, each its pitch and rhythm, near and far, one tree cricket trilling softly; the night’s air under them.

events 🔒

Times of events, rate a second on average, at random (a Poisson process).

looped

A noise of seconds that loops: its last two seconds faded into its first, with equal power, so the end flows into the start. Quiet: about −20 dBFS.

nature

A sound of nature in stereo: its two channels, each looping, about −22 dBFS.

noise 🔒

count samples of a noise: white (flat), pink (−3 dB per octave, Paul Kellett’s filter), brown (−6 dB per octave, a leaky integration).

noise_file

The file of a noise or a sound of nature, made the first time in folder.

rain 🔒

Rain: a soft hiss, many small drops, a few larger ones on leaves and stones.

slow_curve 🔒

A slow, smooth random curve in [0, 1]: a new point every every seconds, joined by cosines; the same for every sample count.

thunder 🔒

Thunder far away: a low rumble rolling for seconds, every half minute or so.

wav 🔒

16-bit mono WAV bytes, at the noises’ rate.

wav_of 🔒

16-bit WAV bytes: channels interleaved, at rate.

waves 🔒

Waves on a beach: each swells (a few seconds), breaks (brighter, louder), then withdraws in a fizz of foam; a far surf under them all.

wind 🔒

Wind in the trees: gusts that rise and fall (a moving band of noise), and the leaves rustling with them.