Loudspeaker system with simulated baffle for improved base reproduction
OwnerMaximilian Hans Hobelsbergerinventor
Life of this patent
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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.
Claims14
In a loudspeaker system with housing, at which the pressure of the air in the chamber which adjoins the inner surface of the front-loudspeaker's membrane is influenced by the movement of the membrane of an inner transducer built into wall means within the housing, further comprising pressure sensing means arranged within the housing to measure said air pressure, the signals produced by said pressure sensing means being used by calculating means for calculation of setpoint values of movement of said inner transducer's membrane, further comprising a controller and a power amplifier, whereby the controller forces via the power amplifier said inner transducer's membrane to move with values of movement substantially equal to said setpoint values,
- the improvement comprising said calculating means to produce such setpoint values of movement that said controller forces said inner transducer's membrane 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 which is proportional to the timely derivative of said air pressure,
- a second summand which is proportional to the timely integral of the deviation of said air pressure from the mean air pressure,
- and a third summand which is proportional to said air pressure.
Method for improving the bass reproduction of loudspeaker systems with housings, comprising the steps of
- influencing the pressure of the air in the chamber which adjoins the inner surface of the front-loudspeaker's membrane by moving the membrane of an inner transducer built into wall means within the housing,
- measuring said air pressure with pressure sensing means arranged within the housing,
- calculating setpoint values of movement for said inner transducer's membrane using the signals produced by said pressure sensing means,
- forcing with a controller and a power amplifier said inner transducer's membrane to move with values of movement substantially equal to said setpoint values,
- and calculating such setpoint values of movement that said controller forces said inner transducer's membrane to move with a speed which is substantially proportional to a sum which comprises at least one summand selected from the group consisting of
- a first summand which is substantially proportional to the timely derivative of said air pressure,
- and of a second summand which is substantially proportional to the timely integral of the deviation of said air pressure from the mean air pressure.
Dependencies are inferred from the claim text.