Beyond Visible Light
LIFE v1.0 maps acoustic frequencies to visible light - the range human eyes can perceive, from approximately 380nm (violet) to 700nm (red). The scaling constant 2⁴⁰ was chosen specifically to bridge the audible range to this part of the electromagnetic spectrum.
But the electromagnetic spectrum extends far beyond what we can see. And the scaling constant is a choice, not a constraint.
The full picture
The electromagnetic spectrum spans an enormous range:
| Region | Frequency range | Wavelength |
|---|---|---|
| Radio waves | Hz - MHz | kilometres to metres |
| Microwaves | GHz | centimetres to millimetres |
| Infrared | THz | micrometres |
| Visible light | 430 - 770 THz | 700nm - 380nm |
| Ultraviolet | PHz | nanometres |
| X-ray | EHz | picometres |
| Gamma | ZHz | femtometres |
LIFE v1.0 targets only the bold row. Everything else is unexplored.
Different constants, different media
The relationship between octaves is always a doubling of frequency - a ratio of 2:1. The number of octaves between the audible range and any target frequency range can always be calculated, and expressed as a power of 2.
To target microwave frequencies - the GHz range - a different constant would be needed. The mathematics is identical. The medium changes.
This matters for a specific reason.
Radio and SETI
Radio waves are what SETI listens to. For decades, the Search for Extraterrestrial Intelligence has scanned the radio spectrum for structured signals - signals that look mathematical rather than random.
A LIFE-encoded signal transmitted in the radio spectrum would look exactly like that. It would contain harmonic ratios. It would have internal mathematical structure. It would be self-describing - the preamble would contain the decoding instructions.
We are not claiming that a LIFE-encoded radio transmission would be immediately intelligible to another civilisation. We are claiming that it would be more likely to be recognised as structured than a signal without harmonic organisation.
The Voyager connection
The Voyager Golden Record carried music - structured frequency relationships - on a physical disc. The implicit assumption was that harmonic ratios might be recognisable to a receiver that understood wave physics.
LIFE makes that assumption explicit and gives it a formal specification.
A LIFE-encoded radio transmission of Brandenburg Concerto No. 2 - the same piece that opened the Golden Record - would carry the same harmonic relationships, in a self-describing format, at the speed of light.
The Golden Record travels at 17 kilometres per second. Light travels at 299,792 kilometres per second.
Status
Version 1.1 of the LIFE specification will address multi-spectrum encoding - the ability for a single .life file to target multiple frequency ranges simultaneously, with different scaling constants per channel.
This is an open question and an active area of development. Contributions welcome at hello@life-codec.org.