Yes. View the LISNR Tech Overview sheet.
LISNR does not record any audio. LISNR technology utilizes bandpass filters around the frequencies of interest and all other frequencies (including voice) are rejected. An audio buffer is used to detect the LISNR Tone, and this buffer gets overwritten constantly and is never stored.
We have tested playing tones for long periods of time with no negative effects. The LISNR tone is inaudible to the the majority of people. A very small population may be able to hear audio in the range of the LISNR tone however, this does not cause any negative side effect.
Please visit one of our LISNR Solutions Pages above to view our current use cases.
Some animals can hear the tone, however, the LISNR tone is broadcasted in the FCC safe range for audio frequencies. Reference the How LISNR Smart Tones Affect Animals and Hearing for more information.
We support two tone profiles and three types of tones:
LISNR enables offline authentication, single use tones combined with metadata and tokenization between devices to ensure a completely secure connection. Please reference our Security Whitepaper to learn more. You can also encrypt your data before you modulate it into the payload of a tone, and decrypt the data after you demodulate the tone.
Output, or “volume”, determines the range of a LISNR Tone. In basic terms, increasing the volume increases the range, while decreasing the volume shortens the range. For mobile device to mobile device, average distance for Standard tone is ~20 ft and Precision is ~3ft. Can be increased with external speakers.
Depending on the chosen Tone Profile and payload size of your transmission, your detection rates will vary. Throughput of Standard profile is 33.3 bits/second, 66.6 bits/second (wideband). Throughput of Precision profile is 1000 bits/second, 2000 bits/second (wideband). For example, a Standard Tone (wideband) with a payload of 6 bytes will detect in 1.7 seconds. A Precision Tone with a payload of 6 bytes will detect in 0.43 seconds.
No. All LISNR Tones are decoded locally on the device.
LISNR frequencies live in the 18kHz-20kHz range which is higher than the majority of human voices and environmental noise.
We currently support iOS, Android, Linux -x86 64-bit, Raspberry Pi, Windows -64 bit, Vista+. Our core C library can be built into a variety of other systems and platforms. By using the LISNR API, you can also generate and play tones on other platforms that have a network connection. Please reach out to email@example.com to learn more.
Reference the App Knowledge for more information.