An ear-plug assembly presents audio content to an ear canal of a user. The audio content may be based in part on sound in a local area surrounding the user. The ear-plug assembly detects, via one or more acoustic sensors, sound in the area around the user. The sound waves travel through an aperture in a body of the ear-plug assembly and are propagated to a waveguide to the one or more acoustic sensors. The ear-plug assembly processes the detected sound data in a controller, which instructs a speaker assembly to present audio content based in part on the detected sound data. The detected sounds may be amplified, attenuated, filtered, and/or augmented when presented by the speaker assembly.

A loudspeaker for music of the mobile phone includes a sound-transmitting tube with a bell mouth closed at one end and on the tube surface, and a retractable and rotatable externally-closed compensating tube inserted into the sound-transmitting tube, and a long groove-shaped corresponding socket at the relative place of the tube surface of the sound-transmitting tube and the compensating tube, and then the angle and position of the compensating tube are rotated and telescoped, so that a open is formed between two sockets of the sound-transmitting tube and the compensating tube for obliquely inserting the mobile phone with the appropriate width and thickness, so that the music sound played out from the bottom of the mobile phone can be more fully played out from the bell mouth via the sound-transmitting tube, and then the volume is larger, and the sound is warmer and richer.

A loudspeaker for music of the mobile phone includes a sound-transmitting tube with a bell mouth closed at one end and on the tube surface, and a retractable and rotatable externally-closed compensating tube inserted into the sound-transmitting tube, and a long groove-shaped corresponding socket at the relative place of the tube surface of the sound-transmitting tube and the compensating tube, and then the angle and position of the compensating tube are rotated and telescoped, so that a open is formed between two sockets of the sound-transmitting tube and the compensating tube for obliquely inserting the mobile phone with the appropriate width and thickness, so that the music sound played out from the bottom of the mobile phone can be more fully played out from the bell mouth via the sound-transmitting tube, and then the volume is larger, and the sound is warmer and richer.

A vehicle outside microphone unit detects noises outside a vehicle and has a sound channel that has an entry opening terminating at a microphone. In an orientation in which the microphone constitutes an uppermost point of the sound channel, a sound channel makes a bend upwards, starting from the entry opening, and is generally configured as a water drain. Further, a vehicle acoustical system having such a vehicle outside microphone unit and a vehicle having a corresponding vehicle acoustical system are described.

An acoustic meta material (AMM) spiral device for passive amplification of sound is described. The AMM amplifier device employs at least one deep sub-wavelength spiral design with high refraction index, based on an exponential spiral shape. The AMM spiral amplifier is used to focus on low frequency sound amplification and to cover broadband frequency range. Sound emanating from a speaker travels into a spiral channel until reaching the apex of the spiral. When twin spirals are used, the sound then enters a second spiral for radiating into open air.

A mounting system is provided to allow the attachment of an acoustic collector to a handheld electronic device such that sound is conducted directly to the device's microphone. A fitted case or band encloses part of the device and includes a tube running from the collector to the device's microphone. In certain embodiments, the tube may be embedded in the case, and a detachable mount may be provided to connect the collector to the case. The collector may be a stethoscope chestpiece, or an open air collector, such as a parabolic collector.

A mounting system is provided to allow the attachment of an acoustic collector to a handheld electronic device such that sound is conducted directly to the device's microphone. A fitted case or band encloses part of the device and includes a tube running from the collector to the device's microphone. In certain embodiments, the tube may be embedded in the case, and a detachable mount may be provided to connect the collector to the case. The collector may be a stethoscope chestpiece, or an open air collector, such as a parabolic collector.

A surgical instrument includes a housing, an end effector, a movable handle, and a drive assembly. The movable handle includes first and second cantilever spring arms and is movable relative to the housing between a spaced-apart position and an approximated position. The first cantilever spring arm is flexed upon movement of the movable handle from the spaced-apart position towards the approximated position to bias the movable handle towards the spaced-apart position. The drive assembly is operably coupled between the movable handle and the end effector such that movement of the movable handle from the spaced-apart position towards the approximated position moves the end effector from an open position towards a clamping position for clamping tissue. The second cantilever spring arm is flexed upon application of a threshold pressure to tissue clamped by the end effector to control an amount of pressure applied to tissue clamped by the end effector.

A surgical instrument includes a housing, an end effector, a movable handle, and a drive assembly. The movable handle includes first and second cantilever spring arms and is movable relative to the housing between a spaced-apart position and an approximated position. The first cantilever spring arm is flexed upon movement of the movable handle from the spaced-apart position towards the approximated position to bias the movable handle towards the spaced-apart position. The drive assembly is operably coupled between the movable handle and the end effector such that movement of the movable handle from the spaced-apart position towards the approximated position moves the end effector from an open position towards a clamping position for clamping tissue. The second cantilever spring arm is flexed upon application of a threshold pressure to tissue clamped by the end effector to control an amount of pressure applied to tissue clamped by the end effector.

A low frequency underwater sound source for use in an autonomous underwater vehicle includes a cylindrical body having a front portion, a rear portion, a cylindrical piezo-ceramic ring transducer disposed therebetween, and a resonant pipe surrounding the transducer. A gap is formed between an inner surface of the pipe and an outer surface of the transducer. Alternatively, the sound source includes a cylindrical body, a front fairing disposed forward of the cylindrical body, a plurality of metal rods connecting the front of the cylindrical body and the rear of the fairing, a spherical piezo-ceramic transducer disposed between the cylindrical body and the fairing, and a resonant pipe mounted at the front end of the cylindrical body. The spherical transducer is disposed within a cavity within the resonant pipe. A cylindrical orifice is formed between the front end of the resonant pipe and the rear of the fairing.