Patent Number: 6,298,140

Title: Electroacoustic transducer with improved tonal quality

Abstract: An electroacoustic transducer with attenuated effective output irregularities caused by intrinsic normal modes of oscillation. What stands out, as a structural property of a preferred embodiment, is a sandwich assembly, having an oscillating medium of layered components suspended between two rigid baffles, with a hinged baffle extension supporting the device in upright position. An opening, asymmetrically positioned in each of said two rigid baffles, exposes to the ambient medium a driven and asymmetrically positioned antinode belonging to a predetermined mode pattern of the oscillating medium. The resulting asymmetrical and partial coupling of the oscillating medium with the ambient medium limits occurrences of irregularities in effective output. Similarly, the asymmetrical and partial driving of the oscillating medium leads to a relatively high number of normal modes simultaneously excited. Moreover, perturbations in boundary conditions of the oscillating medium give rise to additional superposed standing waves, for a further increase in the number of normal modes simultaneously excited. The resulting higher density of normal modes limits perception of irregularities in effective output. This combined process of limiting both occurrences and perception of irregularities stands out as a functional property of the device for an effective output with improved tonal quality.

Inventors: Manavopoulos; Christos (Refina Attika 19009, GR)


International Classification: H04R 7/00 (20060101); H04R 7/04 (20060101); H04R 025/00 ()

Expiration Date: 10/02/2018