AirText

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Tap Listen on both devices, then send.

Settings

Symbol interval

Band

Bin pitch

Frequencies

The receiver listens only on its own band and bin pitch: both devices need the same band, pitch and frequencies. Any symbol interval is recognised.

Instruments

Measurement bench for the 17–19 kHz band. One device plays a signal at full scale; the other, with Listen on, records it and analyses it here. Levels are in dB relative to a full-scale tone at the microphone. Nothing leaves the page.

Distance between devices m · stored with every measurement below

Everything in one go

On the receiver: set the distance above, tap Measure all. On the sender: tap Play full sequence. The receiver records the 32 tones, the sweep, the three distance tones and a stretch of silence, then fills in every instrument below and adds one attenuation run per tone. Move, change the distance, repeat.

1 · Speaker ceiling and leakage

2 · Sweep: frequency response, echoes, RT60

3 · Attenuation versus distance

4 · Noise floor

Everything measured on this device: the latest result of each instrument above, every attenuation run with its distance, the page version and sample rate.