A telephone system may include a telephone receiver and a base unit. The telephone receiver may include a first electrical contact and a second electrical contact configured to be electrically grounded. The first electrical contact may be either coupled to the second electrical contact or electrically floating. The base unit may be configured to be coupled to the telephone receiver over a wired connection. The base unit may be configured to electrically ground the second electrical contact by way of the wired connection. The base unit may also be configured to determine an identification of the telephone receiver based on whether the first electrical contact is electrically grounded or electrically floating.

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.

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.

A telephone system may include a telephone receiver and a base unit. The telephone receiver may include a first electrical contact and a second electrical contact configured to be electrically grounded. The first electrical contact may be either coupled to the second electrical contact or electrically floating. The base unit may be configured to be coupled to the telephone receiver over a wired connection. The base unit may be configured to electrically ground the second electrical contact by way of the wired connection. The base unit may also be configured to determine an identification of the telephone receiver based on whether the first electrical contact is electrically grounded or electrically floating.

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.

A sound providing method using an earphone set and an earphone set are provided. The sound providing method using the earphone set includes simultaneously providing a first sound wave to a left ear of a user by using a left ear earphone of an earphone set and a second sound wave to a right ear of the user by using a right ear earphone of the earphone set. There is a frequency difference between a first frequency of the first sound wave and a second frequency of the second sound wave. The frequency difference automatically and cyclically changes along with time.

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.

A mobile call device includes a housing having a received-sound outputting opening, a sound device for outputting a sound signal, a frequency-dividing circuit electrically connected to the sound device to receive the sound signal and dividing the sound signal into a low-frequency signal and a high frequency signal, and a dual frequency receiver assembled in the housing and corresponding to the received-sound outputting opening. The dual frequency receiver includes a mount including a first fixing member and a second fixing member, a ceramic vibration member fixedly assembled to the second fixing member and electrically connected to the frequency-dividing circuit to receive the high-frequency signal, and a receiver component fixedly assembled to the first fixing member and including a sound-outputting portion corresponding to and facing the ceramic vibration member. The receiver component is electrically connected to the frequency-dividing circuit to receive the low-frequency signal.

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.

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.