AMS turns 3.5mm jack into power and signal interface
This means that a 3.5mm jack complying with the AMS’ Accessory Communication Interface (ACI) allows the design of noise-cancelling headsets that do not need a dedicated rechargeable battery power supply.
AMS uses the microphone (MIC) wire – one of four wires in a standard 3.5mm audio cable – to carry power and bidirectional data at a rate of up to 16 Mbit/s, as well as digital audio signals but remains compatible with legacy 3.5mm systems.
An ACI equipped ANC headset performs Receive (Rx) noise cancellation and enables 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. The ACI consumes 60 percent 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.
“Not only can OEMs make headsets smaller, lighter and more convenient, but with the addition of sensors, LEDs or displays they can add a variety of features which helps them differentiate their products,” said Christian Feierl, marketing manager at AMS, in a statement.
The ACI standard is implemented by the AS3440 master and AS3445 slave transceiver pair plus the AS3418 which can be used to implement automatic noise cancellation.
The systems is available for sampling.
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