LISNR is considered an ultrasonic technology. The industry has taken this as the standard to communicate the use of audio above human hearing level. All non-technical definitions define ultrasound and ultrasonic as “just above the human hearing level” implying that audio that can’t be heard by a human.
Ultrasonic and ultrasound is defined as above the human hearing level and to +90% of the population that is just about 18kHz. Even in scenarios where individuals can hear LISNR, we are often indistinguishable from background room noise.
LISNR is an ultrasonic inaudible technology; a communication protocol that sends data over audio. We use ultrasonic audio called Smart Tones™ to transmit information.
Click the green “PORTAL” link in the upper right hand corner, and request access. Once you request access to our portal, you will receive our SDKs, integration guides, and full documentation on using LISNR.
You can create and manage your very own Smart Tones and the content associated with them in the LISNR Portal. The LISNR Portal is a sleek, web-based portal with full documentation, content management, APIs, SDKs and Smart Tones.
The first 30 days are free of charge, allowing you to demo the technology. Pricing after your trial is based on your commerical use. For further pricing and payment information please Contact Us.
LISNR’s Smart Tones are comprised of audio signals that vary between frequencies of 18.75 kHz and 19.2kHZ and are inaudible to +90% of the human population. Most humans can only hear frequencies up to about 18 kHz, making LISNR Smart Tones imperceptible and essentially silent.
Under proper conditions, a Smart Tone can be broadcast as close as a few centimeters away or as far as a few hundred meters away depending on the device and speaker. Smart Tone range is a function of volume; the higher the volume of broadcast, the farther the tone can be picked up. We’ve successfully tested our SmartTone via large scale installations and have successfully detected a SmartTone a few miles away.
A device can recognize a Smart Tone in under 3 seconds. Once identified, a Smart Tone can be used to synchronize a device as a second screen accurate to within 1/10th of a second.
Once the LISNR SDK has been embedded into your app, it will leverage your device’s microphone to listen for and decode the Smart Tone.
LISNR has partners that build apps, however, we are not an app development company.
We Do Not Save or Record Any Audio or Personal Data
We do not collect or share any personally identifiable information, nor does LISNR record any audio on the device. We rely solely on the microphone to detect and decode our Smart Tones. All audio received from the microphone is filtered to only include the high frequency, inaudible sound waves that comprise our Smart Tones. LISNR receives and buffers approximately 10 seconds worth of the filtered inaudible audio. Once this data is processed and analyzed, it is overwritten by new data and cannot be saved or recovered in any way.
The LISNR technology was designed and built with power efficiency in mind. LISNR causes less battery drainage than most everyday tasks like GPS or browsing the internet.
LISNR’s Smart Tones are stored in common audio formats such as WAV, MP3, and M4A. Music software such as iTunes, Windows Media Player, or VLC are sufficient to play Smart Tones.
The LISNR SDK currently operates on both the latest Windows, iOS, Android operating systems. Additionally, LISNR also supports additional Linux & Java based SDK’s. LISNR also has a number of API’s that can enable some LISNR functionality.
The amount of data able to be carried will depend on the length of the Smart Tone. Longer tones can carry larger amounts of data. You can choose the length of your Smart Tone in the LISNR Portal.
The LISNR SDK can typically be integrated in less than one week.. The SDK, available for download in our portal, is a few lines of code that can be dropped into the existing codebase of any application.
The average dog can hear a range of up to 45kHz. Smart Tones are comprised of signals in a range of 18 – 20 kHz and are considered low frequency to pets. To animals, LISNR sounds like background noise as it’s hardly distinguishable in normal environments.