Headphone operating on the two-way system

Details Headphone operating on the two-way system Headphone operating on the two-way system

1974-06-12

1976-03-09

Cooper, William C.

179111E, 1791155PS, H04R 2302, H04R 122

Patent

active

039433048

ABSTRACT:
The headphone comprises a low frequency transducer system and a high frequency transducer system, with the low frequency transducer system including an electrodynamic transducer. The high frequency transducer system includes an electrostatic transducer, and a supply transformer for the high frequency transducer system is mounted in the housing of the headphone. The two transducer systems are mounted coaxially of each other, with the high frequency transducer system being outwardly of the low frequency transducer system. The high frequency system may have a disc form or may have an annular form and, in the latter case, the inner diameter of the high frequency system corresponds to the outer diameter of the low frequency system which is received in a circular recess of the high frequency system. Also, the inner diameter of the annular high frequency system corresponds to the dimensions of a sound channel which, together with the cavity formed between the diaphragm of the low frequency transducer and the backside of the high frequency transducer, forms a Helmholtz resonator. For dividing the range of frequencies, acoustics and/or electrical elements are provided and are mounted in the housing of the headphone.

REFERENCES:
patent: 2615994 (1952-10-01), Lindenberg et al.
patent: 2922851 (1960-01-01), Manley
patent: 3008013 (1961-11-01), Williamson et al.
patent: 3158697 (1964-11-01), Gorike
patent: 3632903 (1972-01-01), Lange, Jr.
patent: 3819879 (1974-06-01), Baechtold
Pages 61 & 62 from AWA Technical Review, Vol. 15, No. 2, Dec. 1973, from article "Application of Electrets to Electro-Acoustic Transducers", by R. E. Collins.

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