An earphone comprises a housing including a partition plate with an opening containing a diaphragm. An annular cushion is secured to the periphery of the partition and engages around the wearer's ear to form a coupling space between the diaphragm and the ear. A back covering is connected to the partition defining a soundproof cavity between the partition and the back covering. A partial wall is spaced from the partition on a side opposite the diaphragm to define a first high restoring force cavity. A duct is connected from the restoring force cavity to the outside, and it encloses an air mass which acts as an acoustic mass.
An ear pad for earphones comprises a foam-like material formed into a pad enclosing the user's ear in use in order to expand the essentially linear frequency response of a good earphone so that it brings also the lowest still audible frequencies into the linear region, and simultaneously with the expansion of the transmission range of the earphone, to make the reproduction of stereophonic acoustic events more natural. The ear pad is advantageously shaped and made of open-cell elastic foam material having on its inner and/or its outer side or in its interior so as to be disposed in the sound path from the coupling space outward, at least one passive membrane supported for vibration and having a natural resonance which lies in the range of the lower frequencies.
A headphone having a speaker unit having a diaphragm and a supporting member for supporting the speaker unit so as to face forwardly of a user's head with projection of an edge portion thereof into the cavum concha whereby the speaker diaphgram faces to the entrance of a user's auditory canal with the sound radiating direction thereof.
Some workers wear headsets to protect their hearing from loud persistent noises, such as airplane engines and construction equipment. These headsets are generally passive or active, with the active ones including ear speakers and automatic noise-reduction (ANR) circuitry to cancel or suppress certain types of loud persistent noises. One problem with active headsets the concerns the difficulty of salvaging headsets that fail performance testing. Accordingly, the inventor devised a unique a unique cup-in-cup structure for the earcups of active headsets as well as related assembly and testing methods. The unique structure not only allows for pretesting of the ANR circuitry prior to assembly, but also enhances performance of the resulting headsets.
A module adapted for use in a noise reduction headset earcup has an enclosure having walls separating an interior of the enclosure from an exterior of the enclosure outside the earcup. There is a driver with a diaphragm. A port connects the interior and exterior. An acoustically resistive opening connects the interior and exterior in parallel with the port.
A telephone handset, a cordless telephone or a mobile telephone (4) comprising a transducer (2) provided as a circular capsule (2), which along a ring-shaped front side by means of a ring-shaped gasket is connected to an inner wall of an earcap plane or an earpiece (10), which in front of the front side of the transducer diaphragm has a number of apertures (14), and where a number of acoustic connections (16) to an interior cavity (6) and occurring leakages of the handset or the telephone are provided in said earcap plane or earpiece (10) in such a manner, that said connections (16) are positioned outside the ring-shaped gasket (12) and preferably outside the circumference of the transducer (2) but inside a diameter determined by the ear represented by a standardized measuring ear, that is inside a diameter of preferably 25 mm.
