DoCoMo Shows Sound QR Technology
DoCoMo labs has demonstrated that they can insert audio data on broadcast signals – in music and voice – which can be translated by enabled mobile phones into text messages and URL links. The so-called “Sound QR” uses OFDM modulation technology which is transmitted in parallel by using two or more frequencies at the same time to suppress the influence of area noise and address the potential tone quality deterioration.
The “hTc Z” Windows Mobile terminal was used to demonstrate their application program during the Wireless Japan trade-show at Tokyo Big Site last week. When a radio commercial voice came from a speaker in the booth the data was received for a few seconds and URL is displayed. According to the article it can transmit text volume of about 100 characters at about 1kbps in 1-2 seconds.