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US 6,408,078 B1Granted
Active reactive acoustical elements
OwnerMaximilian Hobelsbergerinventor
Life of this patent
Estimating the term…
Abstract
The loudspeaker system uses an inner transducer for pressure control in the closed loudspeaker housing to simulate the desired baffle properties. The speed of the membrane of the inner transducer is either proportional to the derivative of the pressure, or proportional to the intergral of pressure changes, or comprises summands proportional to the pressure, to the pressure's derivative and to the pressure's intergral.
Claims6
Reactive acoustical impedance element, comprising
- a housing,
- inner wall means for dividing the inner volume of said housing into at least two chambers,
- wherein the first of said chambers is pneumatically connected to the outside of the housing,
- at least one electromechanic transducer, being built into an opening of said inner wall means such that its membrane separates said first chamber from a second chamber,
- pressure sensing means being placed in said first chamber, for measuring the air pressure in said first chamber and for producing first signals indicative of said air pressure,
- calculating means, to the input of which said first signals produced by said pressure sensing means are applied, for calculating output signals based on the values of said first signals,
- a control system, for controlling the movement of said membranes of said electrodynamic transducers, comprising
- one or more power amplifiers, the outputs of said amplifiers being connected to said electrodynamic transducers to drive said transducers,
- one or more electrical controllers,
- to the inputs of which said output signals produced by said calculating means are applied,
- the outputs of said electrical controllers being connected to the inputs of said power amplifiers,
- wherein said calculating means and electrical controllers are dimensioned to force said transducers' membranes to move with a speed which is substantially proportional to the timely derivative of the air pressure in said first chamber.
9 more elements
Reactive acoustical impedance element, comprising
- a housing,
- inner wall means for dividing the inner volume of said housing into at least two chambers,
- wherein the first of said chambers is pneumatically connected to the outside of the housing,
- at least one electromechanic transducer, being built into an opening of said inner wall means such that its membrane separates said first chamber from a second chamber,
- pressure sensing means being placed in said first chamber, for measuring the air pressure in said first chamber and for producing first signals indicative of said air pressure,
- calculating means, to the input of which said first signals produced by said pressure sensing means are applied, for calculating output signals based on the values of said first signals,
- a control system, for controlling the movement of said membranes of said electrodynamic transducers, comprising
- one or more power amplifiers, the outputs of said amplifiers being connected to said electrodynamic transducers to drive said transducers,
- one or more electrical controllers,
- to the inputs of which said output signals produced by said calculating means are applied,
- the outputs of said electrical controllers being connected to the inputs of said power amplifiers,
- wherein said calculating means and electrical controllers are dimensioned to force said transducers' membranes to move with a speed which is substantially proportional to the timely integral of the air-pressure deviations in said first chamber.
9 more elements
Reactive acoustical impedance element, comprising
- a housing,
- inner wall means for dividing the inner volume of said housing into at least two chambers,
- wherein the first of said chambers is pneumatically connected to the outside of the housing,
- at least one electromechanic transducer, being built into an opening of said inner wall means such that its membrane separates said first chamber from a second chamber,
- pressure sensing means being placed in said first chamber, for measuring the air pressure in said first chamber and for producing first signals indicative of said air pressure,
- calculating means, to the input of which said first signals produced by said pressure sensing means are applied, for calculating output signals based on the values of said first signals,
- a control system, for controlling the movement of said membranes of said electrodynamic transducers, comprising
- one or more power amplifiers, the outputs of said amplifiers being connected to said electrodynamic transducers to drive said transducers,
- one or more electrical controllers,
- to the inputs of which said output signals produced by said calculating means are applied,
- the outputs of said electrical controllers being connected to the inputs of said power amplifiers,
- wherein said calculating means and electrical controllers are dimensioned to force said transducers' membranes to move with a speed which is substantially proportional to a sum which comprises at least two summands selected from the group consisting of
- a first summand being substantially proportional to the timely integral of said air pressure deviation from the mean pressure,
- a second summand being substantially proportional to the timely derivative of said air pressure,
- a third summand being substantially proportional to said air pressure deviation.
12 more elements
Dependencies are inferred from the claim text.