Patent ID: 9299335
Filing Date: 2016-03-29
CPC Classification: G10K,H04R

Claim Text:
1. A handheld electronic device, comprising: a connection interface, comprising a first pin, a second pin and a third pin, wherein the first pin is configured to transmit a first speaker signal and the second pin is configured to transmit a second speaker signal; a first impedance unit, electrically connected between the second pin and a power supply voltage; a second impedance unit, electrically connected between the second pin and a reference voltage; a voltage supply unit, electrically connected to the third pin; and a baseband circuit, electrically connected to the second pin, the third pin and the voltage supply unit, wherein the baseband circuit is configured to determine whether there is a headphone being electrically connected to the connection interface according to a voltage change at the second pin, wherein when there is a headphone being electrically connected to the connection interface, the baseband circuit is further configured to control the voltage supply unit to provide a first voltage to the third pin and then determine a type of the headphone according to a voltage at the third pin, wherein when the headphone is determined as a noise-canceling headphone and the handheld electronic device decides to activate a noise-canceling function of the noise-canceling headphone, correspondingly the baseband circuit is configured to control the voltage supply unit to provide a second voltage to the third pin, wherein the second voltage is functioned as an operation power of a noise-canceling circuit, for providing the noise-canceling function, of the noise-canceling headphone.