LISNR® is an advanced, near-ultrasonic, ultra-low power data transmission technology that enables fast, reliable, and secure communication between devices via a speaker and/or microphone.
Acting as a secure local proxy for data transmission, our technology is removing the need for complex, expensive, and power-consuming wireless technologies.
LISNR® is the creator of a proprietary near-ultrasonic protocol that sends data-over-audio. Originally coined Smart Tones™ in 2012, our audio technology has evolved into the KAB® (Kilo Audio Bit). LISNR®’s protocol sends data-over-audio across bandwidths (14.5 kHz-19.2 kHz) that are audible or inaudible, depending on use case and distribution method, to ensure optimal performance.
The tone preamble announces the presence of a tone to begin SDK demodulation.
The header contains metadata about the payload and security logic.
The payload is the actual data-containing portion of the tone.
We’ve created multiple tone types and profiles, optimized for varying payload and environment characteristics of the use case. All tone profiles and types are compatible with a single SDK.
Inaudible: Has a frequency range of 18.75-19.2 kHz. This profile has been optimized to solve the problem of reverberation and increase reliability.
Audible: Has a frequency range of 14.55-15 kHz. Similar to our standard profile, but optimized for implementations that have frequency range restrictions such as FM radio, video, and audio streaming.
Inaudible: Has a frequency range of 18.0-19.2 kHz. This profile has been optimized to work best in live environments at close distances.
Displays as an image, web link, video, etc. but needs the API to communicate to the server so it cannot be locally generated. However, content preloading allows applications to store content locally on a user’s device that is activated when the associated LISNR tone is heard by the device.
Displays as text only (ASCII) and can be locally generated in offline environments.
Displays as binary data and can be locally generated in offline environments.
LISNR®’s technology is built within a C-library base conveniently allowing adaptability across the connected world ecosystem. This library allows interoperability across all software applications from device operating systems to chip-level embedded systems.
In order to decode the data present in the waveform, the audio is run through a software program. Our SDKs only recognize LISNR® audio that falls within the specified frequency range, filtering out the rest.
This is the central developer dashboard to access, manage, and demo LISNR® technology use.
The LISNR® software development kit encapsulates the functions needed for devices to utilize our technologies on various platforms, allowing for tone modulation and demodulation. We currently support the following platforms:
*Full modulation & demodulation
Our CMS (Content Management System) assists clients in interacting with the API and data in a more visual manner
Our application program interface allows customers to seamlessly integrate LISNR® services within their systems by making simple HTTP requests.
This allows clients to view specific metrics related to how their customers are interacting with their LISNR® integration.
Available to LISNR® Portal users, this is used for testing tones and content created via the LISNR® Portal and local device-to-device transmission over sound
Our library offers support documentation to create and facilitate deployment.
Broadcasting and receiving data via is sound is powered by integrating our software. We provide a simple communication method that can be layered into any existing software, device, service, or media. As you design the ideal experience, the end user can be the broadcaster, the receiver, or both. LISNR® can carry the current data you are using offline from one device to the next. To meet LISNR security standards, additional tokenization should be applied to LISNR® ’s header and encryption to the payload.
Learn how to start sending data over audio, or just drop us a line. We'd love to hear from you.