High fidelity loudspeaker system

• US 3,186,509 A
• Filed: 02/05/1963
• Issued: 06/01/1965
• Est. Priority Date: 02/13/1962
• Status: Expired due to Term

• Current Assignee: Jean-Pierre Dudognon
• Original Assignee: Jean-Pierre Dudognon
• Inventors: JEAN-PIERRE DUDOGNON
• Application Number:
  US04/256,336
• Time in Patent Office: 847 Days
• US Class Current: 181/155
• CPC Class Codes: H04R 1/26 Spatial arrangements of separate transducers responsive to two or more frequency ranges
• CPC Class Codes: H04R 1/2811 for loudspeaker transducers
• CPC Class Codes: H04R 1/2819 for loudspeaker transducers

Claims

1. A SUBSTANTIALLY APERIODIC LOUDSPEAKER SYSTEM COMPRISING, IN COMBINATION:

MEANS INCLUDING BAFFLE BOARD MEANS DEFINING AN ACOUSTIC CHAMBER, SAID BAFFLE BOARD MEANS EXTENDING TRANSVERSELY OF SAID CHAMBER AT THE FRONT THEREOF;

A REARWARDLY EXTENDING DYNAMIC SPEAKER MOUNTED IN SAID BAFFLE BOARD MEANS, FIRST PARTITION MEANS IN SAID CHAMBER DEFINING A FIRST REARWARDLY CONVERGENT ACOUSTIC PASSAGE EFFECTIVELY COAXIAL WITH SAID SPEAKER;

SECOND PARTITION MEANS DEFINING AN AIR POCKET IN SAID CHAMBER EXTENDING ADJACENT TO THE REAR OF SAID CHAMBER SUBSTANTIALLY THROUGHOUT THE ENTIRE WIDTH THEREOF, SAID FIRST ACOUSTIC PASSAGE COMMUNICATING DIRECTLY WITH SAID AIR POCKET AT A LOCATION ADJACENT TO ONE SIDE OF SAID CHAMBER;

THIRD PARTITION MEANS DEFINING A SECOND ACOUSTIC PASSAGE EXTENDING LATERALLY AWAY FROM SAID SPEAKER AND COMMUNICATING DIRECTLY WITH SAID AIR POCKET AT A LOCATION ADJACENT TO THE OTHER SIDE OF SAID CHAMBER, SAID THIRD PARTITION MEANS INCLUDING A PLURALITY OF WALL MEMBERS OF DIFFERING LENGTHS WHICH EXTEND FROM THE SIDES OF SAID SECOND PASSAGE AT SPACED LOCATIONS THEREALONG OBLIQUELY TOWARD THE LONGITUDINAL AXIS THEREOF AND CONVERGENTLY AWAY FROM SAID SPEAKER WHEREBY THE ACOUSTIC IMPEDANCE OF SAID SECOND PASSAGE IS LESS FOR ACOUSTIC WAVES TRAVELING AWAY FROM SAID SPEAKER THAN IN THE OPPOSITE DIRECTION, SAID DIFFERING LENGTHS DETUNING SAID SECOND PASSAGE FROM RESONANCE AT ANY PARTICULAR FREQUENCY WITHIN A PREDETERMINED RANGE OF FREQUENCIES;

AN ANGULARLY ADJUSTABLE REFLECTOR MEANS LOCATED EXTERIORLY OF SAID CABINET, SAID REFLECTOR MEANS COMMUNICATING WITH THE INTERIOR OF SAID CABINET IN PROXIMITY TO THE LOCATION WHERE SAID SECOND PASSAGE COMMUNICATES WITH SAID AIR POCKET.