A signal converter includes a chamber, a first diaphragm, a second diaphragm, and a first converter. The chamber has a first opening at one end and a second opening at a second end opposite the first end. The first diaphragm is disposed so as to cover the first opening. The second diaphragm is disposed so as to cover the second opening. The first converter is disposed in the chamber and configured to generate a first signal based on a vibration of the first diaphragm.

A loudspeaker comprises a diaphragm, a tubular voice coil assembly coupled to the diaphragm, a magnet assembly providing an annular gap in which the tubular voice coil assembly is arranged, and a flexible suspension. A longitudinal axis of the tubular voice coil assembly extends along a central axis of the loudspeaker. A longitudinal axis of the annular gap extends along the central axis of the loudspeaker. The flexible suspension has a disc shape and is configured to guide a movement of the tubular voice coil assembly along the central axis of the loudspeaker. The flexible suspension extends substantially perpendicular to the central axis. An inner diameter of the tubular voice coil assembly is greater than or equal to an outer diameter of the flexible suspension.

A speaker unit is provided. The speaker unit may include a frame; a yoke elongated on the frame along a front-to-rear direction; a first magnet disposed on one side of the yoke; a first plate disposed on one side of the first magnet; a first diaphragm disposed on one side of the first plate; a first coil fixed to the first diaphragm; a second magnet disposed on the other side of the yoke; a second plate disposed on the other side of the second magnet; a second diaphragm disposed on the other side of the second plate; a substrate disposed on the frame; a microphone electrically connected to the substrate; and a second coil fixed to the second diaphragm, wherein the first magnet and the second magnet are both in contact with the yoke, the frame includes a seating portion, and the microphone is disposed in the seating portion.

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.

An electro-acoustic transducer includes a base, a plurality of vibration portions and a connection portion. Each of the vibration portion includes a piezoelectric transduction layer and has a first connection end and a second connection end opposite to each other, and the first connection ends are connected to the base. The connection portion is separated from the base and connected to the second connection ends. The piezoelectric transduction layers are adapted to receive electrical signals to deform, such that the vibration portions are driven to vibrate and generate corresponding acoustic waves. The vibration portions are adapted to receive acoustic waves to vibrate, such that the piezoelectric transduction layers are driven to deform and generate corresponding electrical signals.

A speaker unit is provided. The speaker unit may include a frame; a yoke elongated on the frame along a front-to-rear direction; a first magnet disposed on one side of the yoke; a first plate disposed on one side of the first magnet; a first diaphragm disposed on one side of the first plate; a first coil fixed to the first diaphragm; a second magnet disposed on the other side of the yoke; a second plate disposed on the other side of the second magnet; a second diaphragm disposed on the other side of the second plate; a substrate disposed on the frame; a microphone electrically connected to the substrate; and a second coil fixed to the second diaphragm, wherein the first magnet and the second magnet are both in contact with the yoke, the frame includes a seating portion, and the microphone is disposed in the seating portion.

A signal converter includes a chamber, a first diaphragm, a second diaphragm, and a first converter. The chamber has a first opening at one end and a second opening at a second end opposite the first end. The first diaphragm is disposed so as to cover the first opening. The second diaphragm is disposed so as to cover the second opening. The first converter is disposed in the chamber and configured to generate a first signal based on a vibration of the first diaphragm.

The present disclosure provides a dual magnetic circuits structure and a sound device, the dual magnetic circuits structure includes a shell and an inner magnetic assembly, the shell is made of a magnetically permeable material, the inner magnetic assembly is arranged in the shell and includes a first inner magnetic element and a second inner magnetic element, a first magnetic gap, a second magnetic gap, an outer diameter of the second inner magnetic element is greater than that of the first inner magnetic element. Therefore, compared to the existing dual magnetic circuits structure, the dual magnetic circuits structure provided by the present invention has the advantage that the thickness of the whole dual magnetic path structure can be effectively reduced while ensuring that the vibration spaces and winding heights of the first voice coil and the second voice coil are not changed.

A speaker unit with dual diaphragms and dual coils includes a casing, first and second magnetic members, and first and second vibration systems. The casing has a chamber. The first and second magnetic members are disposed in the chamber. The first vibration system includes a first diaphragm fixed on the casing and located in the chamber, and a first coil fixed on the first diaphragm and located beside the first magnetic member. The first diaphragm has a ring shape. An orthogonal projection of the second magnetic member on an inner bottom surface of the casing is completely located in an orthogonal projection of a central opening of the first diaphragm on the inner bottom surface. The second vibration system includes a second diaphragm fixed on the casing and located in the chamber, and a second coil fixed on the second diaphragm and located beside the second magnetic element.

A linear motor magnet assembly 2 for use in a loudspeaker unit 1, with a fixed base actuator component 4 and a membrane actuating element 5, the membrane actuating element 5 having a linear excursion axis A. A first auxiliary magnetic element 7 and a second auxiliary magnetic element 8 are present, the first auxiliary magnetic element 7 providing a first auxiliary spatial magnetic field with a major axis aligned with the linear excursion axis A. The second auxiliary magnetic element 8 is fixedly connected to the membrane actuating element 5 of the linear motor magnet assembly 2 and has a second auxiliary spatial magnetic field, the second auxiliary magnetic field overlapping the first auxiliary spatial magnetic field and being substantially similarly oriented as the first auxiliary spatial magnetic field over a first predetermined excursion range E1 of the linear motor magnet assembly 2.