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Audio Signal Processing

Loudspeaker-system

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Loudspeaker system

Details

Inventors: Steuben, Richard;
Assignee: Steuben; Richard (Sacramento, CA)
Primary Examiner: Isen; Forester W.
Assistant Examiner:
Attorney, Agent or Firm: Majestic, Parsons, Siebert & Hsue

A loudspeaker system is arranged to house an electromagnetic loudspeaker driver of the type having both front and back acoustic waves. The loudspeaker driver is reversed mounted such that its weaker back waves are emitted directly to the outside, while its stronger front waves are directed through an internal passageway of the loudspeaker enclosure before adding in phase and exiting with the back waves. The front waves are phase-shifted by half a wavelength through the internal passageway which acts as a transmission line. The attenuation suffered through the transmission line is offset somewhat by the stronger front waves such that the differential amplitudes of the front and back exiting waves are minimized. Throughout the transmission line, the flow of the sound waves is kept circular and laminar in order to maintain coherence and to further minimize loss of energy due to turbulence. These are accomplished by the use of a cylindrical passageway, a streamlining reflecting cone, and an outer reflecting ring. Finally, the exiting front and back waves are deflected into the listening environment via a sound reflecting surface positioned near the exit of the loudspeaker enclosure. Additionally, the loudspeaker system employs an efficient crossover network which include a low-pass network branch for each loudspeaker driver in the system.

DETAILED DESCRIPTION These and additional objects are accomplished by improvements in a loudspeaker system employing transmission-line concepts.
According to one aspect of the invention, the loudspeaker system comprises a loudspeaker enclosure with a passageway therein acting as a transmission line.
A loudspeaker driver is mounted backward on the loudspeaker enclosure such that its weaker emitting back face is facing outward and its stronger emitting front face is facing inward into the passageway.
This helps to reduce the sound pressure differential between the front and back waves when they are finally added.
According to another aspect of the invention, a loudspeaker enclosure configuration is employed such that a high degree of coherence is maintained between the front and back waves emitted from a driver which is an extended source.
This is accomplished by having the passageway disposed symmetrically about the driver.
In this way, the path length from each emitting point on the extended source through the passageway is the same.
In the preferred embodiment, the loudspeaker system comprises a loudspeaker driver mounted on a loudspeaker enclosure.
The loudspeaker enclosure comprises two concentric cylinders each having first and second ends.
The second end of the outer cylinder extends further than that of the inner cylinder and is closed off by an end disk.
The two cylinders define a passageway which runs from the first to the second end of the inner cylinder and turns around at the end disk of the outer cylinder and then runs from the second to the first end along the annular space between the outer and inner cylinder.
The loudspeaker driver is mounted with its back face facing out and its front face facing into the first end of the inner cylinder.
In this way, the stronger front waves are sent through the passageway while the weaker back waves are emitting directly out of the loudspeaker enclosure.
The length of the passageway is tuned such that the front waves traveling through it undergo a phase shift of 180

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