Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1976-09-03
1978-08-15
Stellar, George G.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
1791155VC, 181155, 181163, 181173, H04R 120, H04R 134, H04R 702, H04R 902, H04R 904, H04R 906
Patent
active
041074793
ABSTRACT:
A loudspeaker comprising a plurality of stages extended along a predetermined direction, each stage of which includes a movable diaphragm having a resonance out of the frequency range of reproduction and movable within a support structure. The diaphragms are driven transversely in unison by a distributed drive system capable of propagating longitudinal acoustical waves at a very high velocity and therefore also nonresonant within the range of the speaker. The drive system is connected to suitable electro-acoustic motional transformer such as a moving coil permanent magnet system. The coil longitudinal drive means and diaphragm masses are made exceedingly low so that the collective mass is comparable to the air mass in the immediate vicinity of the speaker which air mass serves to load the same. No damping materials are employed. The speaker is further characterized by being in extended form in which the diaphragm structure as a whole is constructed along a predetermined direction in space, and therefore approximates from a short distance away from the speaker a cylindrically propagating wave system. It is found tht such wave system results in a far lower storage of kinetic energy within the surrounding air mass so that exceptionally high transient response is achieved. Particular forms of the speaker system are disclosed utilizing graphite rods or graphite cables the latter being placed in tension, or an aramid polymer type fiber the bulk longitudinal acoustic propagating velocity of which is exceptionally high.
REFERENCES:
patent: 1273459 (1918-07-01), Chudzikowski
patent: 1775453 (1930-09-01), Foley
patent: 3015366 (1962-01-01), Bishop
patent: 3636278 (1972-01-01), Heil
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