A loudspeaker includes a voice coil in a balanced state. In the loudspeaker, at least a first suspension element acts on a first side of the voice coil, and at least a second suspension element acts on a second side of the voice coil. The loudspeaker includes a symmetric magnet assembly. The voice coil aligns with the symmetric magnet assembly. The symmetric alignment contributes to the loudspeaker yielding substantially symmetric motor force (BL), suspension stiffness (K), and inductance (Le).

Provided is a digital acoustic system comprising: a ΔΣ modulator that modulates a digital input signal and outputs a digital signal; a post-filter that is connected to the ΔΣ modulator and which performs mismatch shaping to convert the digital signal; a parallel-serial converter that converts the digital signal converted by the post-filter into a digital signal which is serially transmitted; a serial-parallel converter that restores the digital signal converted by the parallel-serial converter; and a drive circuit which receives the digital signal restored by the serial-parallel converter, and drives drive elements to convert the signal into an analog audio signal.

A double-voice coil moving-coil loudspeaker comprises a bracket. A U-shaped cup with a circular groove is fixed in the bracket. A vibrating diaphragm is fixed on the bracket at the position of the U-shaped cup. A large voice coil and a small voice coil distributed in a concentric circle are arranged on the vibrating diaphragm. A circular large magnet and a circular small magnet distributed in a concentric circle are arranged in the U-shaped cup. A circular big washer and a circular small washer are respectively arranged on an upper surface of the large magnet and the small magnet. The big voice coil and the small voice coil are respectively arranged in a gap formed by the U-shaped cup and the big washer and a small gap formed between the U-shaped cup and the small washer. The U-shaped cup is provided with air vents. The air vents of the U-shaped cup are communicated with a gap between the big washer and the smaller washer and a gap between the big magnet and the small magnet. The invention has the benefit of improving sound quality while reducing the cost of manufacturing.

A driver for a loudspeaker including an inner magnet disposed within a housing, an outer magnet disposed within the housing radially outward of the inner magnet, an inner voice coil having a first diameter, an outer voice coil having a second diameter, the second diameter being larger than the first diameter, where poles of the inner and outer magnets are oppositely disposed, where the inner magnet is configured to contribute only to a magnetic circuit of the inner voice coil, and where the outer magnet is configured to contribute to the magnetic circuit of the inner voice coil and to a magnetic circuit of the outer voice coil.

Disclosed is an ultra-thin speaker comprising: a housing; and a magnetic circuit system therein; a vibration system comprising a cone assembly and a voice coil, the cone assembly having a taper ≤25°, a peripheral edge thereof connected to the housing, and a middle part thereof having a through hole, the voice coil is fixedly connected at an edge of the through hole, the voice coil surrounds and is suspended around the magnetic circuit system, being able to vibrate by an action of the magnetic field generated by the system when a sound signal is introduced; and a dust cap assembly comprising a dust cap body, a central region of the dust cap body is fixedly connected to the system, and an edge region of the dust cap body is connected to the cone assembly and is able to expand and contract along with the vibration of the cone assembly.

A multi-driver transducer having symmetrical magnetic circuits and symmetrical coil circuits, wherein one or more pieces of circular or annular partitions made of a non-magnetic material are used to bond two or more sets of dual magnetic gap and dual coil driver units (01 or 02) into one integrated magnetic core. Four or more coaxial isodiametric annular magnetic gaps are formed between the inner circumferential face or outer circumferential face of one or two tubular magnetic yokes embedded in an open-end tubular thin wall of the bracket and the vertical circumferential face of an upper pole plate and a lower pole plate of the magnetic core, four or more coaxial and isodiametric coils are inserted in the four or more coaxial and isodiametric annular magnetic gaps, and the winding direction, connection manner, and necessary technical features of the coils are governed; thus, the multi-driver transducer having one or more pairs of mutually-repelling magnets, symmetrical magnetic circuits, and symmetrical coil circuits is constituted. Back electromotive force and inductance acquired via induction by the transducer during the working process are mutually offset. The transducer has resistive load features or near-resistive load features, and has super-high sensitivity, high resolution, and high-fidelity quality.

Embodiments are directed to a micro transducer array comprising a shared motor system having a base plate and mounting interfaces to a frame of a portable electronic device; a first transducer comprising a first magnet disposed between the base plate and a first top plate, and a first diaphragm projecting sound out of a surface of the portable device; a second transducer comprising a second magnet disposed between the base plate and a second top plate, and a second diaphragm projecting sound of an opposite surface of the portable device; a first pair of input terminals inputting a first audio signal to the first transducer; and a second pair of input terminals inputting a second audio signal to the second transducer.

A vibration apparatus includes a substrate, an elastic piece, a magnetic component and at least two coils. The substrate abuts on a display panel of a mobile terminal; the at least two cods are fixed on an inner side surface of the substrate; the inner side surface faces away from the display panel; the at least two coils are disposed coaxially; and axes of the at least two coils are perpendicular to the substrate. A first side surface of the elastic piece abuts on the inner side surface of the substrate; the magnetic component is connected to a second side surface of the elastic piece; the second side surface is disposed away from the first side surface. The at least two cods are at least in part accommodated in an annular accommodating groove of the magnetic component.

The present invention provides a speaker having a vibrating system and a magnetic circuit system for driving the vibrating system to vibrate and sound. The magnetic circuit system has magnetic gap. The vibrating system includes vibrating assembly and voice coil assembly connected to the vibrating assembly, the voice coil assembly is inserted into the magnetic gap. The magnetic circuit system has a magnetic line concentrating area in the magnetic gap. The voice coil assembly includes a first voice coil connected to the vibrating assembly and a second voice coil arranged on the first voice coil at a side away from the vibrating assembly. if in the magnetic line concentrating area locates only the first voice coil, an electric signal is input only to the first voice coil; if in the magnetic line concentrating area locates only the second voice coil, electric signal is input only to the second voice coil.

The present invention discloses a speaker having a frame, a vibrating system and a magnetic circuit system. The vibrating system has a vibrating diaphragm, a voice coil for driving the vibrating diaphragm, and an elastic supporting assembly fixed on the frame and connected to the voice coil. The magnetic circuit system has a main magnet, a secondary magnet spaced on two opposite sides of the main magnet, a magnetic plate stacked on the secondary magnet and spaced away from the elastic supporting assembly, and an auxiliary magnet fixed on the magnetic plate and spaced away from the main magnet. The elastic supporting assembly is positioned on the other two opposite sides of the main magnet. The auxiliary magnetic located close to the vibrating diaphragm and facing to the elastic supporting assembly. The speaker of the present invention has advantages of good reliability and excellent acoustic performance.