An audio circuit is configured to allow an analog voltage to be input via its volume setting pin. A power supply pin receives a power supply voltage. A bias circuit generates a first reference voltage that corresponds to the analog voltage. A D/A converter converts a digital audio signal into an analog audio signal. AD/A converter has a variable voltage range with a full scale that can be changed according to the first reference voltage. A class D amplifier outputs an output pulse signal having a duty cycle that corresponds to the analog audio signal output from the D/A converter and having an amplitude that corresponds to the power supply voltage.

An audio circuit is configured to allow an analog voltage to be input via its volume setting pin. A power supply pin receives a power supply voltage. A bias circuit generates a first reference voltage that corresponds to the analog voltage. A D/A converter converts a digital audio signal into an analog audio signal. AD/A converter has a variable voltage range with a full scale that can be changed according to the first reference voltage. A class D amplifier outputs an output pulse signal having a duty cycle that corresponds to the analog audio signal output from the D/A converter and having an amplitude that corresponds to the power supply voltage.

A flexible arm that is configured to be located between and physically and electrically connect an acoustic module of an open-ear headphone to a battery housing of the open-ear headphone. The flexible arm defines an original resting length and position between the acoustic module and the battery housing. The flexible arm includes a flexible printed circuit that extends through the entire original resting length of the flexible arm and comprises a conductor that is configured to carry electrical energy between the acoustic module and the battery housing, and a flexible material that encases at least some of the flexible printed circuit. The length of the flexible printed circuit within the flexible arm is greater than the original resting length of the flexible arm. The flexible printed circuit can thus better accommodate tension or compression on the flexible arm as the flexible arm is bent from its original resting position.

The present disclosure relates to an integrated active noise-canceling wireless Bluetooth headphone, which comprises a housing assembly, primary and secondary magnet sets, primary and secondary magnetic conductive sheet sets, an integrated circuit board assembly, a bracket and a tuning net. The primary and secondary magnet sets, the primary and secondary magnetic conductive sheet sets, the integrated circuit board assembly and the bracket are sequentially laminated in the housing assembly; the tuning net is arranged on an outer surface above the housing assembly; the integrated circuit board assembly is integrated; the periphery of the integrated circuit board assembly is exposed outside the housing assembly; a noise-canceling speaker module interface is embedded in the exposed part of the integrated circuit board and electrically connected with the integrated circuit board; and a light-sensing in-ear detector is surface-mounted on the integrated circuit board.

A head-mountable device can include a speaker unit that provides structural support to its own components and electrical connections between other components. The arrangement of conductive strips within a back plate of a speaker unit can provide the structural support needed by the components of a speaker while allowing components on opposing sides of the speaker unit to be operably connected to each other. By providing both functions with the conductive strips of a back plate, the total space required is minimized so that the head-securement element (e.g., band) of the head-mountable device maintains a thin profile.

A speaker device in one embodiment of the present invention includes a plurality of microphones including at least a first microphone and a second microphone, and a speaker unit including a vibrating surface, a distance between a predetermined position on the vibrating surface and the first microphone being equal to a distance between the predetermined position and the second microphone.

A generic loudspeaker enclosure including a cabinet including internal partitions defining a plurality of acoustic chambers that are sealed, distinct, and separated from one another by said internal partitions, each acoustic chamber including an orifice opening to the outside of the cabinet in a respective different direction; a plurality of loudspeakers, each including a respective diaphragm, each loudspeaker being incorporated in a respective one of the acoustic chambers; at least one first connector mounted in sealed manner on the cabinet, the first connector having contacts that are electrically connected to the loudspeakers, the first connector thus being arranged to connect the loudspeakers electrically to the electronic card of the electronic additional module via a second connector mounted on the electronic additional module and complementary to the first connector.

A generic loudspeaker enclosure including a cabinet including internal partitions defining a plurality of acoustic chambers that are sealed, distinct, and separated from one another by said internal partitions, each acoustic chamber including an orifice opening to the outside of the cabinet in a respective different direction; a plurality of loudspeakers, each including a respective diaphragm, each loudspeaker being incorporated in a respective one of the acoustic chambers; at least one first connector mounted in sealed manner on the cabinet, the first connector having contacts that are electrically connected to the loudspeakers, the first connector thus being arranged to connect the loudspeakers electrically to the electronic card of the electronic additional module via a second connector mounted on the electronic additional module and complementary to the first connector.

Disclosed is an earphone including a housing, a speaker unit accommodated in the housing, and a printed circuit board (PCB) accommodated in the housing, disposed below the speaker unit, and configured to provide an electrical signal to the speaker unit. Here, the speaker unit includes a first diaphragm, a first voice coil fixed to the first diaphragm, at least one magnet disposed below the first diaphragm, a frame which accommodates the first diaphragm, the first voice coil, and the magnet, and a substrate which receives and transmits an electrical signal from the PCB to the first voice coil. The substrate is disposed on an upper side of the speaker unit. The earphone further includes a connection pin.

The embodiments of present disclosure disclose a loudspeaker. The loudspeaker may include an ear hook including a first plug end and a second plug end. The ear hook may be surrounded by a protection sleeve, and the protection sleeve may be made of an elastic waterproof material. The loudspeaker may include an earphone core housing configured to accommodate the earphone core, and the earphone core housing may be fixed to the first plug end through plugging, and may be elastically abutted against the protection sleeve elastically. The loudspeaker may include a circuit housing configured to accommodate a control circuit or a battery. The circuit housing may be fixed to the second plug end through plugging.