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Parametric loudspeaker with electro-acoustical disphragm transducer

A parametric speaker, parametric sound technology, applied in electrostatic transducer speakers, piezoelectric/electrostrictive transducers, transducer circuits, etc. Problems such as the impossibility of operation of film-type emitters

Inactive Publication Date: 2005-05-25
AMERICAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An ultrasound emitter by means of a "high power" form (bimorph transducer) does not achieve the required level of volume and quality, an obvious assumption by those skilled in the art that electrostatic or low power membrane types Emitters are less likely to operate in the parametric sound domain

Method used

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  • Parametric loudspeaker with electro-acoustical disphragm transducer
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  • Parametric loudspeaker with electro-acoustical disphragm transducer

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Embodiment Construction

[0090] Referring now to the drawings, in which various elements of the invention will be given numerical references and in which the invention will be discussed in order to enable those skilled in the art to make and use the invention. It is to be understood that the following description is only exemplary of the invention, and should not be taken as limiting the ensuing claims.

[0091] Figure 1a and 1b is a diagram showing a prior art parametric speaker 10 using a plurality of piezoelectric bimorph transducers 11 . These have been used with strings of 500 to over 1500 bimorph transducers. One of the difficulties with parametric loudspeakers is that, when driving air at ultrasonic levels to provide adequate conversion efficiency and loudness at secondary generation frequencies, it is possible to drive air into a shock limit where the fundamental frequency cannot becomes louder, while only the distortion components increase in magnitude. The shock limit is worse when drivi...

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Abstract

A parametric loudspeaker that produces multiple high frequencies directly so that lower frequencies are indirectly created by a substantially monolithic large-area membrane transducer that is larger in diameter or cross-section than the wavelength of the carrier frequency. One configuration includes a movable diaphragm extending along the core member and moving a short distance in a stronger portion of a magnetic field. At least one low-mass planar conductive coil is disposed on the movable diaphragm and includes first and second contacts such that current flow through the coil produces a first magnetic field that attracts and repels the diaphragm at a desired frequency to produce a magnetic field that can be adjusted to A compression wave sequence comprising an ultrasound frequency range.

Description

[0001] This application is a divisional application of the Chinese patent application titled "Parametric Loudspeaker with Electroacoustic Diaphragm Transducer", the filing date is August 26, 1999, and the application number is 99812680.2. technical field [0002] This invention relates to electrostatic loudspeaker transducers. More specifically, the invention relates to parametric loudspeaker transducers comprising a stator element and based on a membrane-type diaphragm. These transducers consist of a single-stage, electro-mechanical conversion of an ultrasonic voltage signal into an ultrasonic compression wave whose value differs corresponding to a new acoustic or subsonic compression wave frequency. Background technique [0003] A parametric speaker is an acoustic emission device that directly emits high-frequency ultrasonic waves represented by a carrier frequency and sideband frequencies generated from modulation of the carrier frequency for an audio signal. These dispe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R17/00H04R3/00H04R7/02H04R19/00H04R19/02
CPCH04R19/00H04R2217/03
Inventor 艾伦·罗伯特·赛尔夫利治皮埃尔·克胡利－亚库比爱尔伍德·G.·诺里斯詹姆斯·J.·克罗夫特三世
Owner AMERICAN TECH
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