One embodiment provides a method including: receiving, using a microphone of an electronic device, user audio input; detecting, using a processor, at least one factor that impacts quality of the audio input received; and notifying, using an output device of the electronic device, a user of an event associated with the at least one factor. Other aspects are described and claimed.

Provided is a condenser microphone circuit that can support variation in power supply voltage of a phantom power supply using a wiring system of two lines. A condenser microphone circuit includes a microphone unit, an FET, a constant current diode, a collector grounding first transistor that generates an operation power supply of the FET, a first resistor that sets base potential of the first transistor, a collector grounding second transistor that amplifies an output signal from the FET, a second resistor that sets base potential of the second transistor, and an output circuit. A base of the first transistor is connected to a source of the FET, an emitter of the first transistor is connected to a drain of the FET, a base of the second transistor is connected to the drain of the FET, an emitter of the second transistor is connected to the output circuit, and the second resistor divides voltage on a cathode side of the constant current diode.

Provided is a headphone that can readily adjust the frequency response characteristics corresponding to the shape of a housing. The headphone includes a first sound emission unit and a head band. The first sound emission unit includes a driver unit, a baffle plate, a housing cover, and an acoustic resistor disposed between the driver unit and the housing cover. The housing cover defines a space together with the driver unit, and the baffle plate. The driver unit includes a diaphragm and a communication hole. The space has a first region and a second region. The diaphragm includes a main dome and an auxiliary dome. The communication hole includes a first communication hole facing the main dome and introducing first sound waves from the main dome to the first region and a second communication hole facing the auxiliary dome and introducing second sound waves from the auxiliary dome to the second region. The housing cover includes at least one vent hole establishing communication between the second region and the exterior of the housing cover.

An apparatus, method and system of enhancing a sound effect of VR glasses is disclosed. The method may include detecting angular velocity data of a turning of the VR glasses through a gyroscope sensor and detecting turning direction data of the VR glasses through a compass sensor when a user wears the VR glasses to watch video; acquiring, by a mobile terminal, the angular velocity data and the turning direction data, judging a change of the turning direction of the VR glasses using the turning direction data, controlling a change of a volume level according to the change of the turning direction, and accordingly adjusting an audio output of the mobile terminal, including volumes of left and right sound channels.

A headphone is disclosed that includes a headband and a pair of sound emitting units. The headband is a band-shaped body that is curved in an arch shape. The sound emitting units each have a flat shape and are disposed at both ends of the headband. The sound emitting units each include a piezoelectric actuator of a flat film shape disposed on a flat plane of a sound emission housing of a flat shape. The piezoelectric actuator includes a piezoelectric film made of an organic piezoelectric material such as PLLA, and first and second driving conductors disposed on opposing principal planes of the piezoelectric film.

An audio output device which outputs an audio signal that offsets a direct sound in the first speaker to offset the direct sound generated in the second speaker is provided. The audio output device according to various exemplary embodiments includes a first speaker configured to output a first audio signal, the first speaker being disposed at a first side of the audio output device, a second speaker configured to output a second audio signal, the second speaker being disposed at a second side of the audio output device, and an audio signal processor configured to control the first speaker to output the third audio signal to remove the element provided in the same direction with the first side among the second audio signal.

An audio output device which outputs an audio signal that offsets a direct sound in the first speaker to offset the direct sound generated in the second speaker is provided. The audio output device according to various exemplary embodiments includes a first speaker configured to output a first audio signal, the first speaker being disposed at a first side of the audio output device, a second speaker configured to output a second audio signal, the second speaker being disposed at a second side of the audio output device, and an audio signal processor configured to control the first speaker to output the third audio signal to remove the element provided in the same direction with the first side among the second audio signal.

An apparatus, method and system of enhancing a sound effect of VR glasses is disclosed. The method may include detecting angular velocity data of a turning of the VR glasses through a gyroscope sensor and detecting turning direction data of the VR glasses through a compass sensor when a user wears the VR glasses to watch video; acquiring, by a mobile terminal, the angular velocity data and the turning direction data, judging a change of the turning direction of the VR glasses using the turning direction data, controlling a change of a volume level according to the change of the turning direction, and accordingly adjusting an audio output of the mobile terminal, including volumes of left and right sound channels.

An embodiment of the invention provides a resiliently deformable and flexible in-ear sound device having stretchable electronic circuitry. The in-ear sound device may be configured in a variety of ways, including, but in no way limited to a smart earplug, a flexible personal sound amplification product, a personal music player, a walkie-talkie and the like.

A method of protecting a speaker from thermal damage includes determining a first load current through a first resistor that is coupled to the speaker. The method also includes converting the first load current to a digital value using a second load current through a second resistor as a reference input. The second resistor is part of a circuit that reduces an effect of a temperature coefficient of resistance of the first resistor. The method also includes comparing the digital value of the first load current to a threshold value. The method further includes, responsive to the first load current being larger than the threshold value, generating an instruction to take an action to protect the speaker.