Left and right earphones are independently wireless such that the left and right earphones are not physically connected when worn by a user. Each earphone comprises a speaker, a body portion, and an earbud extending from the body portion. The body portion comprises a downwardly extending portion that extends straight downwardly when the earphone is worn by the user, a wireless communication circuit for receiving signals transmitted wirelessly to the earphone from a remote source, a microphone, a rechargeable battery, a memory and a processor. Each earphone is configured to receive from a remote computing device, and store in the memory, a firmware update.

Left and right earphones are independently wireless such that the left and right earphones are not physically connected when worn by a user. Each earphone comprises a speaker, a body portion, and an earbud extending from the body portion. The body portion comprises a downwardly extending portion that extends straight downwardly when the earphone is worn by the user, a wireless communication circuit for receiving signals transmitted wirelessly to the earphone from a remote source, a microphone, a rechargeable battery, a memory and a processor. Each earphone is configured to receive from a remote computing device, and store in the memory, a firmware update.

Provided is a method of adjusting volume of an audio signal output from an electronic device, the method including: connecting the electronic device and a mobile terminal; receiving, by the electronic device, at least one of setting information regarding adjusting of the volume of the audio signal and usage history information of the at least one mobile terminal; receiving, by the electronic device, event generation information from the at least one mobile terminal; determining, by the electronic device, a volume adjusting operation to be performed on the audio signal based on the at least one of the setting information and the usage history information, and the event generation information; and adjusting the volume of the audio signal according to the volume adjusting operation.

Provided is a method of adjusting volume of an audio signal output from an electronic device, the method including: connecting the electronic device and a mobile terminal; receiving, by the electronic device, at least one of setting information regarding adjusting of the volume of the audio signal and usage history information of the at least one mobile terminal; receiving, by the electronic device, event generation information from the at least one mobile terminal; determining, by the electronic device, a volume adjusting operation to be performed on the audio signal based on the at least one of the setting information and the usage history information, and the event generation information; and adjusting the volume of the audio signal according to the volume adjusting operation.

Systems and methods for automatically adjusting device volume based on learned volume preferences are disclosed herein. A first device receives a wireless signal from a second device. A signal strength of the wireless signal is determined, and a location of the second device is determined based on the signal strength of the wireless signal. Historical volume level data for the first device is retrieved from memory. A target volume level for the first device is determined based on the location of the second device and the historical volume level data. A volume setting of the first device is automatically adjusted to the target volume level.

According to a first aspect of the embodiments, a microphone mixer is provided comprising: an input adapted to receive differential microphone (mic) output signals; a gain-trim circuit adapted to receive the differential mic output signals, and which includes a substantially fully differential amplifier adapted to amplify the received differential mic output signals through use of a gain-trim output adjustment device that provides a variable gain amount ranging from a first gain-trim gain value to a second gain-trim gain value, to produce differential gain-trim circuit output signals; a fader circuit adapted to receive the differential gain-trim circuit output signals, and which includes a differential amplifier adapted to attenuate the received differential gain-trim circuit output signals through use of a fader output adjustment device that provides a variable gain amount ranging from a first fader gain value to a second fader value; and a common adjustment apparatus that mechanically ties the gain-trim output adjustment device with the fader output adjustment device such that the first gain-trim gain value and first fader gain value are obtained substantially simultaneously at a first position of the common adjustment apparatus, and the second gain-trim gain value and second fader gain value are obtained substantially simultaneously at a second position of the common adjustment apparatus.

Embodiments relate generally to hearing protection devices which incorporate a calibration mode which allows the user to perform a calibration test to determine an individualized hearing threshold. Embodiments of the device may also comprise a normal mode to prevent input signals greater than the individualized hearing threshold from being transmitted to the user's ear canal. In addition, embodiments may comprise a normal mode configured to limit input signals to less than or equal to a standard industry threshold in the case no calibration test has been completed by the user. This may increase user comfort and prevent hearing damage.

Embodiments relate generally to hearing protection devices which incorporate a calibration mode which allows the user to perform a calibration test to determine an individualized hearing threshold. Embodiments of the device may also comprise a normal mode to prevent input signals greater than the individualized hearing threshold from being transmitted to the user's ear canal. In addition, embodiments may comprise a normal mode configured to limit input signals to less than or equal to a standard industry threshold in the case no calibration test has been completed by the user. This may increase user comfort and prevent hearing damage.

Provided is a semiconductor integrated circuit including a pad Pd1 provided on one end side of a resistive element R1 externally provided, a pad Pd5 provided on a different end side of the resistive element R1; an operation amplifier A1, a signal line L11 wired between an output terminal of the operation amplifier A1 and the pad Pd1, a signal line L21 wired between an inverting input terminal of the operation amplifier A1 and the pad Pd5, a ESD protection element r11 provided to the signal line L11, and a signal line L31, through which a voltage signal of the pad Pd1 is transmitted. The signal line L31 is connected to the pad Pd1.

Provided is a semiconductor integrated circuit including a pad Pd1 provided on one end side of a resistive element R1 externally provided, a pad Pd5 provided on a different end side of the resistive element R1; an operation amplifier A1, a signal line L11 wired between an output terminal of the operation amplifier A1 and the pad Pd1, a signal line L21 wired between an inverting input terminal of the operation amplifier A1 and the pad Pd5, a ESD protection element r11 provided to the signal line L11, and a signal line L31, through which a voltage signal of the pad Pd1 is transmitted. The signal line L31 is connected to the pad Pd1.