Audio playing device having earphone jack with rotation detector

摘要

An audio playing device may operate in a first mode or a second mode. The audio playing device includes a speaker, an earphone jack receiving an earphone plug of an earphone, a sound output driver, a rotation angle detector, and a processor. The sound output driver only drives the speaker when the audio playing device operates in the first mode and only drives the earphone when the audio playing device operates in the second mode. The rotation angle detector generates a first mode change signal when the earphone plug is rotated in the earphone jack along a first direction over a predetermined angle. The processor changes operation of the audio playing device between the first mode and the second mode when the processor receives the first mode change signal from the rotation angle detector.

主权项

1. An audio playing device operating in a first mode or a second mode, the audio playing device comprising:
a speaker; an earphone jack configured to receive an earphone plug of an earphone; a sound output driver only driving the speaker when the audio playing device operates in the first mode, and only driving the earphone when the audio playing device operates in the second mode; a rotation angle detector detecting rotation of the earphone plug received in the earphone jack, and generating a first mode change signal when the earphone plug is rotated in the earphone jack along a first direction over a predetermined angle; and a processor changing operation of the audio playing device between the first mode and the second mode when the processor receives the first mode change signal from the rotation angle detector; wherein the rotation angle detector further generates a second mode change signal when the earphone plug is rotated in the earphone jack along a second direction over the predetermined angle; the processor changes the operation of the audio playing device from the first mode to the second mode when the processor receives the first mode change signal, and changes the operation of the audio playing device from the second mode to the first mode when the processor receives the second mode change signal; the processor records a first sound volume Vi of the sound outputted by the speaker when the audio playing device operates in the first mode without the earphone plug inserted into the earphone jack, and calculates a second sound volume Vi′ according to the first sound volume Vi to control the sound outputted by the earphone when the audio playing device operates in the second mode, the second sound volume Vi′ is calculated by a formula of Vi′=Vi*(Vb/Va), wherein Va represents a maximum sound volume outputted by the speaker and Vb represents a maximum sound volume outputted by the earphone.