Back to results
US 11,770,053 B2Granted
Method of determining a voice coil position and voice coil system
AssigneeTymphany Acoustic Technology Limited
InventorsRuben Minoru Tuemp Millyard, George Albert Bullimore
Life of this patent
Estimating the term…
Abstract
A method for determining a voice coil position of a voice coil includes providing a magnetic circuit having a magnetic gap and suspending the voice coil in the magnetic gap, applying a driving signal to the voice coil to produce an electromotive force, providing inductive sensors mechanically coupled to the voice coil, measuring inductive sensor signals based on outputs from the inductive sensors, processing the measured inductive sensor signals by determining at least one inductive sensor signal ratio, and determining a representation of the voice coil position based on the at least one inductive sensor signal ratio. A voice coil system, which can be incorporated in a loudspeaker, is configured to carry out the method.
Claims40
A method for determining a voice coil position of a voice coil, comprising:
- providing a magnetic circuit having a magnetic gap and suspending said voice coil in said magnetic gap, wherein said voice coil comprises a plurality of
- voice coil sections which are driven independently and individually;
- selectively applying a driving
- signal individually to said plurality of voice coil sections of said voice coil to produce an electromotive force moving said voice coil along a travelling axis;
- providing inductive sensors, said inductive sensors being mechanically coupled to said voice coil, said inductive sensors comprising:
- a first inductive sensor;
- and
- a second inductive sensor;
- measuring inductive sensor signals, said inductive sensor signals comprising a first inductive sensor signal based on an output from said first inductive sensor and a second inductive sensor signal based on an output from said second inductive sensor;
- processing said inductive sensor signals, said processing comprising determining at least one inductive sensor signal ratio based on said inductive sensor signals, said at least one inductive sensor signal ratio comprising a first inductive sensor signal ratio based on said first inductive sensor signal and said second inductive
- sensor signal, without based on the sum of said first inductive sensor signal and said second inductive sensor signal;
- and
- determining a representation of said voice coil position based on said at least one inductive sensor signal ratio.
10 more elements
A voice coil system, comprising:
- a magnetic circuit, comprising:
- a magnetic gap;
- and
- a voice coil suspended in said
- magnetic gap, wherein said voice coil comprises a plurality of
- voice coil sections which are driven independently and individually;
- a plurality of inductive sensors mechanically coupled to said voice coil, said plurality of inductive sensors comprising a first inductive sensor and a second inductive sensor;
- and
- a processing unit configured to:
- selectively applying a driving signal individually to said plurality of voice coil sections of said voice coil to produce an electromotive force moving said voice coil along a travelling axis;
- receive inductive sensor signals, said inductive sensor signals comprising a first inductive sensor signal based on an output from said first inductive sensor, and said inductive sensor signals comprising a second inductive sensor signal based on an output from said second inductive sensor;
- determine at least one inductive sensor signal ratio based on said inductive sensor signals, said at least one inductive sensor signal ratio comprising a first inductive sensor signal ratio based on said first inductive sensor signal and said second inductive sensor signal, without based on the sum of said first inductive sensor signal and said second inductive sensor signal;
- and
- determine a representation of a voice coil position based on said at least one inductive sensor signal ratio.
11 more elements
A loudspeaker, comprising:
- a diaphragm;
- an interface configured to receive an audio signal;
- and
- a voice coil system, comprising:
- a magnetic circuit, comprising:
- a magnetic gap;
- and
- a voice coil suspended in said
- magnetic gap, wherein said voice coil comprises a plurality of
- voice coil sections which are driven independently and individually;
- a plurality of inductive sensors mechanically coupled to said voice coil, said plurality of inductive sensors comprising a first inductive sensor and a second inductive sensor;
- and
- a processing unit configured to:
- selectively applying a driving signal individually to said plurality of voice coil sections of said voice coil to produce an electromotive force moving said voice coil along a travelling axis;
- receive inductive sensor signals, said inductive sensor signals comprising a first inductive sensor signal based on an output from said first inductive sensor, and said inductive sensor signals comprising a second inductive sensor signal based on an output from said second inductive sensor;
- determine at least one inductive sensor signal ratio based on said inductive sensor signals, said at least one inductive sensor signal ratio comprising a first inductive sensor signal ratio based on said first inductive sensor signal and said second inductive sensor signal, without based on the sum of said first inductive sensor signal and said second inductive sensor signal;
- and
- determine a representation of a voice coil position based on said at least one inductive sensor signal ratio.
15 more elements
Dependencies are inferred from the claim text.