Headset type detection and configuration techniques

摘要

A circuit including headset type detection provides compatibility with different transducer types, such as headphones provided by different manufacturers. An audio circuit that generates or receives an audio signal includes electrical terminals for coupling to a transducer device, at least one of which carries the audio signal. A transducer device type detection circuit is included and detects a type of a transducer device coupled to the audio device from characteristics measured at the multiple electrical terminals when the transducer is coupled to the audio device. The circuit also includes a configuration control circuit for altering a configuration of the audio device according to a detected type of the transducer device.

主权项

1. An audio device comprising:
an output audio circuit for generating at least one output audio signal; an audio input circuit for receiving at least one input audio signal; multiple electrical terminals for coupling a transducer device to the audio device, wherein a first terminal of the multiple electrical terminals is coupled to the at least one output audio signal and a second terminal of the multiple electrical terminals is coupled to the audio input circuit when the audio device is configured in an operational configuration; a bias circuit for supplying a bias voltage to the second terminal at least when the audio device is configured in a detection configuration; a transducer device type detection circuit for detecting a type of the transducer device when the transducer device is coupled to the audio device from characteristics measured at the second terminal when the audio device is configured in the detection configuration; and a configuration control circuit for altering the detection configuration to apply the bias voltage in a first polarity and a second polarity to the second terminal, wherein the transducer type detection circuit detects the type of the transducer device from differences between the characteristics measured when the bias voltage is applied in the first polarity and when the bias voltage is applied in the second polarity, wherein the configuration control circuit further alters the operational configuration of the audio device according to the type of the transducer device detected by the transducer device type detection circuit.