An acoustic transducer includes a first flexible structure having a top surface and a bottom surface. A transducer is attached to the top surface of the first flexible structure, wherein the transducer causes deformation of the first flexible structure when an input electrical signal is applied to the transducer. A second flexible structure has a convex top surface and a concave bottom surface. The convex top surface of the second flexible structure is in contact with the bottom surface of the first flexible structure. Deformation of the first flexible structure causes deformation of the second flexible structure.

A dome material, a diaphragm and a speaker are provided. The speaker includes the diaphragm made of the dome material. The dome material includes an intermediate layer, an adhesive layer, a film layer, and a surface layer. The adhesive layer, the film layer, and the surface layer are sequentially stacked on the intermediate layer in a direction away from the intermediate layer. The intermediate layer is formed by a foamed material. A thickness of the adhesive layer is 3-20 μm. The film layer is adhered to the intermediate layer via the adhesive layer. A thickness of the film layer is 2-20 μm. The surface layer adopts fiber prepreg including fiber and resin, the fiber is unidirectionally arranged, and a weight percentage of the fiber is 20%-50%. A surface density of the fiber prepreg is 10-100 g/m.sup.2.

The present disclosure provides a speaker diaphragm and a speaker. The diaphragm includes a thermoplastic polyester elastomer film layer, a thermoplastic polyester elastomer being a copolymer composed of a hard segment A of polyester and a soft segment B of polyether or aliphatic polyester, wherein the thermoplastic polyester elastomer film layer has Young's modulus of 1-1000 MPa, with an elastic recovery rate after 10% strain being greater than or equal to 80%. The speaker diaphragm has a good stiffness, a good damping performance and a good resilience.

The present disclosure provides a speaker diaphragm and a speaker. The speaker diaphragm comprises a thermoplastic polyester elastomer film layer (11), wherein a thermoplastic polyester elastomer is a copolymer composed of a polyester hard segment A and a polyether or aliphatic polyester soft segment B, and the thermoplastic polyester elastomer film layer has a glass transition temperature being less than or equal to 20° C., and a thermoplastic temperature being 50° C.-200° C. The use of the thermoplastic polyester elastomer film layer enables the speaker diaphragm to have a good flexibility, a high reliability, and a good durability, and improves the anti-destructive ability of the speaker.

The present disclosure provides a speaker, comprising a vibration system including a speaker diaphragm and a magnetic circuit system cooperating with the vibration system. The speaker diaphragm comprises a thermoplastic polyester elastomer membrane and has a vibration amplitude of 0.25-1 mm, and the speaker has F.sub.0 of 150-1500 Hz. The speaker has the characteristic of good listening effect.

A speaker diaphragm includes a mixed layer. The mixed layer includes cellulose nanofibers, and polyparaphenylenebenzobisoxazole fibers. An average length of the polyparaphenylenebenzobisoxazole fibers is 0.5 mm or more and 4.0 mm or less.

A diaphragm structure is used for an audio signal output device. The diaphragm structure includes a film substrate, a polymer fiber structure and a thin film metallic glass. The film substrate includes a first surface and a second surface opposite to the first surface. The polymer fiber structure is combined with the first surface of the film substrate. The thin film metallic glass is formed on at least a part of the second surface of the film substrate.

The invention provides apparatus and methods for interference based wave synthesis. The invention comprises (i) receiving information defining output wave characteristics, said output wave characteristics comprising at least an output wave frequency B, and an output signal amplitude M, (ii) determining a constant value A and (iii) driving a first input wave generator to generate a first input wave and (iv) driving a second input wave generator to generate a second input wave, such that the interfered wave synthesized by interference of the first input wave and the second input wave has output wave characteristics defined by the received information.

Disclosed is a bonding structure of a diaphragm for a receiver and a method thereof. The diaphragm of the receiver includes a center diaphragm and a side diaphragm elastically supporting the center diaphragm, formed by heat and pneumatic pressure, and bonded to the center diaphragm. At least one of the center diaphragm and the side diaphragm is formed of a thermoplastic elastomer film.

The invention provides apparatus and methods for interference based wave synthesis. The invention comprises (i) receiving information defining output wave characteristics, said output wave characteristics comprising at least an output wave frequency B, and an output signal amplitude M, (ii) determining a constant value A and (iii) driving a first input wave generator to generate a first input wave and (iv) driving a second input wave generator to generate a second input wave, such that the interfered wave synthesized by interference of the first input wave and the second input wave has output wave characteristics defined by the received information.