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Audio interface carries data and power using a standard jack
17 May 2017, Electronics Technology

ams has come up with a technology that can carry data and power via a four-pole 3,5 mm audio jack, primarily devised as a way for noise-cancelling headsets to operate without a dedicated battery power supply. The new Accessory Communication Interface (ACI) invented by the company uses the microphone wire – one of four wires in a standard 3,5 mm audio cable – to carry power and bidirectional data with a rate of up to 16 Mbps, as well as digital audio signals.

An ACI equipped ANC headset can perform receive (Rx) noise cancellation and enable transmit (Tx) noise cancellation on voice calls which increases audio quality significantly. The device can use headset-mounted sensors to add features including gesture recognition, proximity sensing, heart rate measurement, temperature sensing and others. Moreover, a display or special light effects can be added to the headset, providing innovative opportunities for differentiation.

The solution consumes 60% less power than USB Type-C systems, keeping the drain on the handset’s battery to a minimum. The ACI system also requires fewer components than a USB Type-C system and therefore keeps system costs low, enabling manufacturers to afford to bundle an ANC headset with a mobile phone. In addition, the system is compatible with legacy headsets that do not have ACI technology.

For more information visit www.ams.com/ACI


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