The present invention discloses a sound generating apparatus, an electrode device and a method for manufacturing the same. The sound generating apparatus includes a sound generating member, a piezoelectric buzzer and a front cover, wherein the front cover is attached to the front of the sound generating member, and the piezoelectric buzzer is attached to the front cover.

The invention concerns a mobile terminal with at least two transducers (LSm, LSs1, LSS2) used simultaneously as loudspeakers for stereophonic effect. According to the invention, one of said transducers is a main transducer (LSm) with a main working frequency band (Bm) corresponding to at least the phone frequency band, while the other transducer is a secondary transducer (LSs1; LSs2) with a secondary working frequency band (Bs1; Bs2) band different from said main frequency band, the lowest frequencies of said secondary working frequency band (Bs1; Bs2) being greater than the lowest frequencies of said main working frequency band.

Embodiments are directed to a sealed pipe-loaded loudspeaker for augmenting low frequency response in a portable electronic device. A loudspeaker transducer is configured to radiate sound directly out of a forward radiation area and incidentally out of a rearward radiation area, and a sealed transmission line forming a closed pipe acoustically coupled to the transducer through which the rearward radiation propagates to produce standing waves corresponding to the dimensions of the closed pipe, wherein resonances apply a loading to a diaphragm element of the transducer to lower its resonance frequency. An acoustical wave front radiates away from the diaphragm element for the direct sound and is emitted outside of the device, and the rearward radiation is not emitted from the device.

An apparatus for generating a first control signal for a first transducer and a second control signal for a second transducer, including: an input interface providing a first audio signal for a first audio channel and a second audio signal for a second audio channel; a signal combiner for determining from the first audio signal and the second audio signal a combination signal including an approximate difference of the first audio signal and the second audio signal; a signal manipulator for manipulating the combination signal to obtain the second control signal; and an output interface for outputting or storing the first control signal based on the first audio signal, or the second control signal, wherein the signal manipulator is configured to delay the combination signal or to amplify or attenuate the combination signal in a frequency-selective manner to counteract a non-linear transducer characteristic over the frequency of the second transducer.

A method is provided for operating a loudspeaker unit for a portable device, in which sound waves in the audible wavelength range are generated and/or detected with the aid of a MEMS sound transducer. A control unit of the loudspeaker unit operates MEMS sound transducer as an ultrasonic proximity sensor that generates and detects ultrasonic waves to measure a distance between itself and an object. The invention also relates to a loudspeaker unit that includes a control unit for operating a MEMS sound transducer that generates and/or detects sound waves in the audible wavelength range so as to measure a distance between itself and an object.

Embodiments of the disclosure provides a volume adjustment method, a storage medium and a mobile terminal. In the method, physical exercise information of a user is acquired. It is determined whether a mobile terminal meets a preset volume adjustment condition according to the physical exercise information. When the mobile terminal meets the preset volume adjustment condition, a volume adjustment level corresponding to the physical exercise information is determined. A volume of the mobile terminal is adjusted according to the volume adjustment level.

An audio device with an acoustic radiator that emits acoustic radiation from a first side, a housing that defines an acoustic cavity that receives the acoustic radiation emitted from the first side of the acoustic radiator, and first and second sound-emitting outlets in the housing and acoustically coupled to the acoustic cavity such that the outlets emit sound from the acoustic cavity. The second sound-emitting outlet has a greater equivalent acoustic impedance than the first sound-emitting outlet.

Disclosed is a method and apparatus for adjusting volume, a terminal device and a storage medium. According to the method, amplitude information of a sound source is acquired if it is detected that a terminal device is playing the sound source. A type of the sound source is determined according to the amplitude information. Volume adjustment information is determined according to the type of the sound source. Volume of the terminal device is adjusted according to the volume adjustment information.

A linear movement bistable electromagnetic switch, comprising a coil (1), a magnetic rotor (2) movably disposed in an inner hole of the coil (1), a shell (3) which wraps an outer side surface of the coil (1), and an insulating layer (4) disposed between the coil (1) and the shell (3). The magnetic rotor (2) is able to move under the effect of a magnetic field generated after the coil is energized; one end of the magnetic rotor (2) extends out of the coil (1) and is connected to a blocking piece (211) for opening/closing a loudspeaker leakage hole. The magnetic rotor is able to be extended or retracted by changing the direction of current in the coil so as to drive the blocking piece to block or open the leakage hole, such that the call distortion condition can be improved and the high-frequency sound effect will not be reduced.

Disclosed are an electrical-acoustic transformation device and an electronic device, including a moving coil electrical-acoustic transformation unit and a piezoelectric buzzer. The electrical-acoustic transformation device in the present invention has a moving coil sound generating structure and a piezoelectric sound generating structure. The piezoelectric plate compensates the high-frequency response of a vibrating system, realizing an electrical-acoustic transformation device with good performance and super wideband.