Dipole speaker for producing ambience sound

Details Dipole speaker for producing ambience sound Dipole speaker for producing ambience sound

1990-09-28

1992-04-28

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Hearing aid

381 1, H04R 502

Patent

active

051094169

ABSTRACT:
A dipole speaker for use with a multichannel sound reproduction system for producing an acoustical ambience signal. The dipole speaker comprises a transducer which is connected to the sound reproduction system so that it receives a difference signal from between the channels thereof. The transducer may be a unitary loudspeaker or a pair of identical, outward-facing loudspeakers. In response to a difference signal, the transducer generates first and second sound pressure lobes which extend in opposite directions from the dipole speaker, and which are 180 degrees out of phase so that they cancel one another out to produce a null zone which extends in a plane about the speaker. The dipole speaker is used in conjunction with conventional direct-path speakers which are connected to the sound reproduction system. The dipole speaker is positioned in a defined listening area so that the null zone is aligned towards the listener to avoid any sound travelling along a direct path from the speaker to the listener, and the sound pressure lobes are directed towards the walls of the listening area so that the acoustic signal of the dipole speaker is reflected therefrom and arrives at the listener by way of indirect paths. The acoustic signal of the dipole speaker is thus sensed by the listener as arriving from various directions, and its arrival is delayed relative to the arrival of the acoustic output of the direct-path speakers due to the longer lengths of the indirect paths, both of which enhance the ambience of effect of the acoustic output of the dipole speaker.

REFERENCES:
patent: 3588355 (1971-06-01), Holm
patent: 4596034 (1986-06-01), Moncrieff
patent: 4759066 (1988-07-01), Polk et al.
patent: 4819269 (1989-04-01), Klayman

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