Abstract: A headset for audio play, comprising one or more sensor circuit and a control module. The control module comprises a secondary processor circuit and a primary processor circuit. The sensor circuit generates sensor data according to structural deformations of the headset. The secondary processor circuit receives the sensor data and calculates measured values related to the structural deformations of the headset. The primary processor circuit coupled to the secondary processor circuit controls an audio play operation in the headset, and enters a sleep mode when the audio play operation is not required. The secondary processor circuit determines a usage status of the headset according to the measured value and one or more threshold value. The secondary processor circuit wakes the primary processor circuit according to the usage status, and adaptively adjusts at least one threshold value according to the usage status.

Abstract: A sonic ranging method for a mobile phone and a wireless earphone. Firstly, the mobile phone performs an acoustic response test on the wireless earphone. The mobile phone generates a first audio sequence at a first time slot. The wireless earphone recognizes the first audio sequence to generate a second audio sequence. When the mobile phone recognizes the second audio sequence, the mobile phone estimates a length of elapsed time according to the time difference between a current time slot and the first time slot. When the mobile phone obtains the length of elapsed time, a distance between the wireless earphone and the mobile phone may be determined according to a delay compensation parameter and the length of elapsed time. Various potential applications can be implemented based on the invention without the needs for additional hardware circuits in the mobile phone.