Chirping Devices
Sending data over sound
Orlando IoT - August 2019
Agenda
Chirp - Introduction
Acoustic Transmission Usecases
Demo
Using Chirp SDK in embedded devices
Hello👋
I'm Siva
Architect @ Computer Enterprises Inc
#Mobile #IoT #Cloud
Orlando
@ksivamuthu
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Introduction
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What is Chirp?
Chirp is a communications system based on data-over-sound that is packaged as a suite of SDKs.
What does it do?
- Chirp's data-over-sound solution enables the exchange of data between devices.
- The data is encoded into a series of audible/inaudible tones to form a "sonic barcode".
- The encoded data is sent over air, to a receiving device or group of devices where the data is then decoded.
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Transmitter, Channel & Receiver
- The transmitter is a device (e.g. a mobile phone, embedded board, laptop) containing audio output, loudspeaker(s) and running the Chirp SDK
- The channel is typically an acoustic environment or any medium that is able to carry audio.
- The receiver is a device containing audio input, microphone(s) and running the Chirp SDK
Encoding / Decoding
- Chirp uses Frequency Shift Keying for its modulation scheme. Chirp uses an M-ary FSK scheme, encoding input symbols as one of M unique frequencies.
- Patented DSP methods for removal of acoustic artifacts and environmental effects.
- Error detection (CRC) and error correction (Reed-Solomon)
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Transmission Rate
In typical real-world environments, Chirp can transmit at approximately the following rates:
- 1000bps at NFC range (30cm)
- 150bps at peer-to-peer range (3m)
- 15bps at long range (100m)
Frequency
Both Audible & Ultrasonic frequencies are supported.
By default, four protocols are available to use:
- standard: audible transmission, for peer-to-peer ranges
- ultrasonic: inaudible transmission, for peer-to-peer ranges
- 16kHz: intended for embedded devices supporting a 16kHz sample rate
- 16kHz-mono: intended for embedded devices supporting a 16kHz sample rate
Acoustic Transmission Use cases
Transactions
Create fast, secure transactions without a network connection. From ticketing to payments, Chirp connects devices using audible or inaudible frequencies to transmit sensitive data for authentication.
Provisioning
Enable zero-friction, proximity-aware M2M connectivity by integrating Chirp into your embedded devices
![](https://s3.amazonaws.com/media-p.slid.es/uploads/921668/images/6426719/pasted-from-clipboard.png)
Proximity
Discover nearby devices and create seamless, secure connections to broadcast informations, build user groups or transmit data within a smart home or office
![](https://chirp.io/static/beatbugs.7e4bbf9f.png)
Enabling toys to interact with content on any device, Hijinx launched this technology powered by Chirp into the official Beat Bugs toys to accompany the Netflix series.
![](https://hijinxtoys.com/wp-content/uploads/2017/05/New-OverallBB-Head-525x397.png)
Using Chirp SDKs
![](https://s3.amazonaws.com/media-p.slid.es/uploads/921668/images/6423878/Screen_Shot_2019-08-06_at_4.34.09_PM.png)
Demo
Dev Brand Colors
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Reference
Action Items
- Learn and explore Chirp - Data over sound
- Be Kind & Spread Your Awesomeness ...
- Let's break and build
ksivamuthu
![](https://s3.amazonaws.com/media-p.slid.es/uploads/921668/images/5258816/pasted-from-clipboard.png)
ksivamuthu
![](https://s3.amazonaws.com/media-p.slid.es/uploads/921668/images/5959492/pasted-from-clipboard.png)
Thank you !!!
Chirping Devices
By Sivamuthu Kumar
Chirping Devices
Chirping Devices - Sending Data Over Sound - Orlando IoT Meetup Group August 2019
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