Personal listening device with self-adjusting sound volume

摘要

An exemplary personal listening device includes thermo-sensitive elements in its transducers. Each thermo-sensitive element senses temperature change of a corresponding transducer and changes a current flowing through the transducer according to temperature change of the transducer, to reflect the amount of time for which the personal listening device has been working.

主权项

1. A personal listening device, comprising:
two earphone assemblies wearing on the ears of a user, each earphone assembly of the two earphone assemblies comprising:
a housing;two input terminals, coupled to the housing, for receiving electric audio signals generated from an external sound player; anda transducer, in the housing, connected between the two input terminals and configured for converting the electric audio signals to an audible sound, the transducer comprising:a thermo-sensitive element, the thermo-sensitive element configured for sensing a temperature change of the transducer and for changing a current flowing through the transducer according to the temperature change of the transducer, and when the temperature sensed by the thermo-sensitive element increases to a critical value, the current flowing through the transducer sharply decreases so that a volume of the audible sound is automatically reduced to protect the user's ear, and the thermo-sensitive element functions as a vibration coil of the transducer for converting the electric audio signals to the audible sound.