Direction and frequency independent column of electro-acoustic t

Details Direction and frequency independent column of electro-acoustic t Direction and frequency independent column of electro-acoustic t

1981-02-23

1983-08-16

Pellinen, A. D.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

181144, H04R 140, H04R 502, H04R 5027

Patent

active

043993281

ABSTRACT:
An electro-acoustic arrangement comprising a plurality of transducer units including five, seven or nine equally spaced transducers situated in line with the transducers connected to a transmission channel via individual amplitude control devices. The amplitude control devices are adjusted so that the ratios between the conversion factors of the transducer units viewed from end to end are 1:2n:2n.sup.2 :-2n:1 for five transducers to produce an output signal substantially independent of direction and/or frequency. The invention also relates to a combination of five, seven or nine of the foregoing arrangements situated adjacent each other or in line at equal distances with further amplitude control devices connected to a transmission channel. The amplitude control devices are adjusted so that the ratios between the conversion factors of the arrangements, viewed from end to end, form a special relationship.

REFERENCES:
patent: 4199658 (1980-04-01), Iwahara
patent: 4233472 (1980-11-01), Kleis
Augspurger, "Column Loudspeaker Systems", Electronics World, Jun. 1963, pp. 25-27.
Ward, "Another Word on Multiple Speakers", Audio, Dec. 1962, pp. 19-22.

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