A stethoscopic headphone set comprising two identical arms each provided with an earphone, Which arms terminate in a hinged connecting element including a wire spring. The connecting element essentially comprises two mirror-symmetrical identical coupling members which cooperate with each other via a gear transmission and which fully enclose the wire spring. The wire spring may comprise two helical springs which are mirror-symmetrical, each helical spring being incorporated in a coupling member.

An earcup suspension for a headphone includes a housing, having a vertically oriented slot and stationarily mounted on the lower end of a headband to be disposed over the top of the headphone user, an earcup mounting includes a vertical member slidably extending through the slot in the housing and having a rack surface configured to coact with a similarly configured inwardly biased detenting rack stationarily disposed in the slot whereby the earcup mounting may be adjusted vertically with respec...

A wireless stereo headphone is provided that permits a user to listen to a stereo program being received by a conventional receiver/amplifier without the use of interconnecting wires. A transmitter contained within the headphones allows the user to remotely activate the SCAN and SEEK features of the receiver so that not only can he monitor a program and vary its volume, he can also select the program material.

A stereo headphone employing a standard stereo headphone plug is adapted for automatically hearing a monaural signal at both earpieces, when accessing a typical monaural source. In the first embodiment of the invention, an impedance element couples the signal from a first acoustical driver that receives the monaural signal from the stereo plug tip, to a second acoustical driver that is connected to the stereo plug ring and normally receives no signal when plugged into a conventional monaural aud...

A headphone unit having left and right ear piece units and an input cord having two conductors an end of each of which projects into a housing. Within the housing, the input cord is connected to two equipment cords which terminate in a pair of input plugs. Each of the equipment cords has two lines. The input plugs each have portions for receiving left and right audio signals. The lines carrying left audio signals from the two input plugs are connected to the input cord conductor which leads to t...

There is provided a headphone with a behind-the-head headband comprising at least one transducer and a behind-the-head headband for receiving the transducer. The behind-the-head headband further comprises first and second contact locations for resting against a temporal bone of a wearer of the headphone. The spacing between the transducer and the first or second contact location can be adjusted. By virtue of the possibility of adjusting the spacing with respect to the contact location the transd...

This invention may provide a headphone driving circuit needless of coupling condenser even if the power supply supplies a single output voltage. The headphone driving circuit comprises (1) a first amplifier to amplify a first composite signal generated by subtracting a second channel audio signal from a first channel audio signal, then driving one end of a first voice coil of a stereo-headphone, (2) a second amplifier to amplify a second composite signal generated by subtracting the first channe...

A headphone is made handy for carrying or storing. The headphone includes a pair of right and left headphone units, and an elastic band formed substantially into a U shape, which is mounted ranging from the human head to both sides of the head, and supports the headphone units in end portions thereof. A multiaxial arm joint is provided between an end part of the elastic band and the headphone unit, and includes a first arm, one end of which is connected turnably to the end part of the elastic ba...

When the operator's headset is plugged in, contacts of the jack operate a relay, which connects ground to conductors of a bus for a "staffed" code. The bus is used principally for keys at the position, with a code for each key. These codes along with the position identity are sent using a key scanner and data link to central control. An acknowledgement of the "staffed" message is returned to a display buffer, to select and operate a relay which causes the "staffed" code to be disconnected from t...

An earphone for a four channel headphone has a filling material of light weight and good sound absorbing nature closely fitted inside a unit case. Two cylindrical or conical holes are provided in the filling material in the unit case. A sound generating element is provided at the bottom of each of the holes so that the sound generating element is directed toward the free open end of the unit case and a space is maintained in front of each of the sound generating elements. The free open end of ea...