The present invention relates to a detachable, portable resonance box (1) for providing acoustic stereo sound from stringed instruments and it comprises a primary sound transmission rod (2) which receives and transmits sound vibrations by contacting directly or by means of a connecting apparatus (11) to any area on the body and neck of the stringed instruments, one to four secondary sound transmission rods (3) which are connected to the primary sound transmission rod (2) as a branch or projected downward independently from the primary sound transmission rod (2) and directly contacted to the relevant region of the stringed instrument (13), a primary resonance zone (4), one to four secondary resonance zones (5), a cap (6), a primary resonance cavity (9), one to four secondary resonance cavities (10), a primary sound routing hole (7).

An apparatus of amplifying sound waves may include a metamaterial structure having a metamaterial inside thereof, an inlet through which air flows into the metamaterial structure, and a penetration portion formed to penetrate a portion of one side of the metamaterial structure, a membrane member coupled to the penetration portion, and a resonance member surrounding the membrane member and coupled to the metamaterial structure and including a space inside thereof and a discharge port fluidically communicating with an outside thereof and the internal space.

An apparatus of amplifying sound waves may include a metamaterial structure having a metamaterial inside thereof, an inlet through which air flows into the metamaterial structure, and a penetration portion formed to penetrate a portion of one side of the metamaterial structure, a membrane member coupled to the penetration portion, and a resonance member surrounding the membrane member and coupled to the metamaterial structure and including a space inside thereof and a discharge port fluidically communicating with an outside thereof and the internal space.

An inspection device is provided, including a base, a circuit assembly, an electrocardiogram sensor, a diaphragm, an annular member, and a positioning member. The base has a top surface, a bottom surface, a guiding portion, an opening, and an accommodating space. The guiding portion is formed on the top surface, the opening is formed on the bottom surface, and the accommodating space is formed between the top surface and the bottom surface. The circuit assembly is disposed in the accommodating space, and has a first contact and a second contact. The electrocardiogram sensor is disposed on the bottom surface and electrically connected to the circuit assembly. The diaphragm covers the opening. The annular member is rotatably connected to the base and has a guiding member. The guiding member is slidably connected to the guiding portion. The positioning member is affixed to the annular member and has a contacting portion.

The present invention relates to a system and a method for collecting unspecific and various sounds, occurring in the field of crime prevention, guard, or the like, in a wide area by means of a microphone without any loss, and provides means for a system and a method for collection using a single microphone and for a system and a method for collection using multiple microphones.

The present invention relates to a system and a method for collecting unspecific and various sounds, occurring in the field of crime prevention, guard, or the like, in a wide area by means of a microphone without any loss, and provides means for a system and a method for collection using a single microphone and for a system and a method for collection using multiple microphones.

An electronic device holder may include a body portion housed within an outer housing. The body portion may include surfaces that form a first cavity configured to receive the electronic device, and a second cavity. A sound transmitting passage can be positioned between the first cavity and the second cavity. The second cavity can passively amplify sound received from the second sound channel of the sound transmitting passage. The body of the electronic device holder can include a first wall, a first partition wall, and a second partition wall. The second wall can be generally parallel to a generally planar bottom surface of the holder and can be positioned between the first wall and the first partition wall so as to define a first cavity. A second cavity can be defined between the second partition wall and the outer housing.

A multi-audio stethoscope head comprising a head body (1) including a sound collecting surface (11), a vibrating diaphragm, and a fastener. The sound collecting surface (11) is provided with a sound guiding hole (16), and the fastener (3) is provided with an axial through hole (33), a fastener sidewall (31) for attaching to the head body (1), and a diaphragm pressing portion (32) for tightly attaching the vibrating diaphragm (2) to the head body (1). The vibrating diaphragm (2) is disposed between the diaphragm pressing portion (32) and the head body (1). Protruding poles (6) protruding toward the vibrating diaphragm (2) is arranged on the sound collecting surface (11) at the radially inner side of the through hole (33), and when the vibrating diaphragm (2) is not subject to external pressure, the vibrating diaphragm (2) is spaced from the protruding poles (6).

Disclosed herein are implementations of acoustic metamaterial structures and geometric configurations of acoustic metamaterial structures which produce sound amplification or cancellation. An acoustic metamaterial device for using with a sound source includes a plurality of fins, where each fin is made from a very dense material with respect to air which creates the anisotropic properties of the acoustic metamaterial device, where each fin has a length dimension, a width dimension, and a thickness dimension, the width and length dimension being equal and substantially perpendicular to the direction of sound wave propagation from the sound source, where each fin is sized different from other fins along the width and length dimension, and where the plurality of fins are interconnected such that planes formed by the width and length dimension of each fin faces perpendicular to the sound wave propagation direction from the sound source.

Disclosed herein are implementations of acoustic metamaterial structures and geometric configurations of acoustic metamaterial structures which produce sound amplification or cancellation. An acoustic metamaterial device for using with a sound source includes a plurality of fins, where each fin is made from a very dense material with respect to air which creates the anisotropic properties of the acoustic metamaterial device, where each fin has a length dimension, a width dimension, and a thickness dimension, the width and length dimension being equal and substantially perpendicular to the direction of sound wave propagation from the sound source, where each fin is sized different from other fins along the width and length dimension, and where the plurality of fins are interconnected such that planes formed by the width and length dimension of each fin faces perpendicular to the sound wave propagation direction from the sound source.