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# Beeps
A program for generating soundtracks of recurrent beeps.
## Beeps
The following beeps can be heard:
* Pairs of recurring beeps every 15 seconds. A high pitch beep immediately
followed by a low pitch beep marks the transition to a 15 second period filled
with 3 second interval beeps. A low pitch beep immediately followed by a high
pitch beep marks the transition to a 15 second period of silence.
* Beeps at 3 second intervals only heard during every other 15 second interval
starting with the first interval.
* Double chirps at 5 minute intervals overlapping with the period transition
beeps.
* A final set of wind-down beeps at the end of the specified duration.
This is useful if you have a task you need to repeatedly do for the duration of
15 seconds at a rate of one every 3 seconds with breaks of 15 seconds to do a
different task. For example some kind of physical exercise.
The 5 minute chirps help track progress through the track.
The final wind-down beeps let you know when you should stop.
## Usage
Run `beeps 300` for a roughly 5 minute track (additional time required for
initial beep and wind-down beeps). The program will output a 8 bit unsigned 8kHz
PCM track. This can be piped directly into a program like `aplay` or converted
into other formats.
The provided `GNUMakefile` (which depends on GNU Make) can be used to produce
Ogg Vorbis or MP3 files containing tracks of 5, 10 and 15 minute duration.
## Samples
* 5 minutes
[Download 5m.ogg (60KiB)][5m.ogg]
[Download 5m.mp3 (295KiB)][5m.mp3]
* 10 minutes
[Download 10m.ogg (114KiB)][10m.ogg]
[Download 10m.mp3 (588KiB)][10m.mp3]
* 15 minutes
[Download 15m.ogg (168KiB)][15m.ogg]
[Download 15m.mp3 (881KiB)][15m.mp3]
[5m.ogg]: https://the-tk.com/files/beeps/5m.ogg
[5m.mp3]: https://the-tk.com/files/beeps/5m.mp3
[10m.ogg]: https://the-tk.com/files/beeps/10m.ogg
[10m.mp3]: https://the-tk.com/files/beeps/10m.mp3
[15m.ogg]: https://the-tk.com/files/beeps/15m.ogg
[15m.mp3]: https://the-tk.com/files/beeps/15m.mp3
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