📡 Sonic Chat

📡 Sonic Ping

Tap PING and any phone in earshot answers with a point noise. The carrier frequency is below or above your hearing — pick the one your hardware can actually transmit. Use the sweep below to find it.

Off

speech (0–8 kHz) carrier (16k ±1.5 kHz)

Carrier (Hz)

Mic waveform

200 ms burst at 16k · silent to most adults

Pings sent

Pings heard

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Last heard

Frequency sweep

Finds the best carrier for your speaker + mic. Plays tones from 8 kHz to 20 kHz and measures the loopback (speaker → air → mic on the same phone). Run it on both devices to compare.

Pair devices

Put both phones into pairing at the same time. Each cycles through every frequency, emitting a beacon and listening for the other. The highest frequency that round-trips on both devices becomes the new carrier.

Activity

Tap PING. Any listening phone nearby — including yours, since the speaker couples back into its own mic — will answer.