There is an assumption that most Iternet of Thing (IoT) systems will be connected by some form. However, if there isn’t any WiFi, Bluetooch or cellular connectivity, what will happen? Researcher will answer the question by audio signals transmittion.
The connection form chosen by communication of IoT equipment depends on the size of the payload to be transmitted, the distencce of and the power of trsnsmitting device. The choice of using protocol is affected by conflicting radio signals and other electric device. The problems should be solved are working in ‘noisy’ environments and consuming less power.
Bluetooth works in 2.4 GHz under the area of 33 feets, while, WiFi works in 2.4 GHz under the area of 60 feets depending on obstructions. The operating frequncy of audio signals is much lower than 20 to 20000Hz. Audio signals can be used by simple microphones and speakers in the distence of over 500 feet with little power. While, a number of data transmitted with audio signals is much less than with WiFi and Bluetooth.
There are three benefits to transmit communication by audio signals. First, the data to be transmitted can sure the properties of a new encoded signal without an existing audio signals. Sencod, encoding and decoding imformation to be transmitted in real-time without any external resources that might need connection by network. Third, it is suitable for small dynamic payloads.
Client can simplely put phone near the device by the “Chirp” function inside home monitor when the monitor can’t connect with WiFi. Then, technicist can inquire the status of home monitor by chirp sound signals.
Chirp is a data transmitting communication campany. Their technology is inserted in sensors and IoT devices. It allows data to be encoded on sending devices, then the data will be transmitted at reciving devices or decoded device group by radio transmission.
Chirp is integrated through a software development kit (SDK). These SDKs work on different technology platforms like android, iOS, Windows UWP, and so on. This allows sensors to connect with a series of devices. Devices can generate chirp by dynamic data. In addition, the chirp will be saved to play later as an audio file– like a sonic barcode.