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DESCRIPTION JP2017502607

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DESCRIPTION JP2017502607
Abstract The present disclosure relates generally to acoustic transducers having fixed and
movable coils, and methods of operating acoustic transducers. Time-varying signals are applied
to the moveable and fixed coils to control the movement of the diaphragm, thereby generating
sound. A time-varying signal is derived from the composite signal provided to the acoustic
transducer via a pair of conductors. Time-varying signals are derived based on various filter
methods. According to some embodiments, the present invention provides a method of operating
an acoustic transducer. The method includes receiving an input speech signal and generating a
time-varying fixed coil signal based on the input speech signal. The method further includes
generating a time-varying movable coil signal based on both the time-varying fixed coil signal
and the input speech signal and providing a composite signal based on the time-varying fixed coil
signal and the time-varying movable coil signal. [Selected figure] Figure 2
[0013] Other features of the various aspects and embodiments are described below. The present
specification also provides, for example, the following items. (Item 1) A method of operating an
acoustic transducer, comprising: receiving an input audio signal; generating a time-varying fixed
coil signal based on the input audio signal; and both the time-varying fixed coil signal and the
input audio signal. Generation of a time-varying movable coil signal, provision of a combined
signal based on the time-varying fixed coil signal and the time-varying movable coil signal,
transmission of the combined signal on a pair of conductors, the fixed coil being in a flux path
The fixed coil control signal is provided to the fixed coil such that a magnetic flux is induced and
the fixed coil control signal is responsive to one of the time varying fixed coil signal and the
composite signal, and a moving coil control signal is time variable fixed. In response to the other
of the coil signal and the combined signal, a moveable coil is disposed in the flux path, and the
moveable coil is coupled to a moveable diaphragm that moves in response to the moveable coil
control signal. Providing the moveable coil control signal to the moveable coil, as applied to:
filtering the applied signal to the combined signal. (Item 2) Provision of a first regulator which is
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one of a current regulator and a voltage regulator, and addition of the time varying fixed coil
signal to the time varying movable coil signal using the first regulator A method according to
item 1, including the provision of the composite signal. 3. The method of claim 2, wherein the
first regulator comprises unidirectional and bidirectional components. 4. The method of claim 3,
wherein the unidirectional component and the bidirectional component are provided as a total
component. 5. The method of claim 4, wherein the total component comprises a class D power
amplifier. 6. The method of claim 3, wherein the unidirectional component and the bidirectional
component are provided as separate components. (Item 7) The first regulator is a current source,
the unidirectional component of the current source includes a buck converter, and the
bidirectional component of the current source is a class D power amplifier and a class AB power
amplifier. Method according to item 6, including one. 8. The first regulator is a voltage source,
the unidirectional component of the voltage source includes a buck converter, and the
bidirectional component of the voltage source includes a class D power amplifier. Method
described. 9. The method of claim 1, wherein the application of the filtering to the composite
signal includes providing a filter for processing the composite signal to derive a version of the
time-varying fixed coil signal from the composite signal. Method described.
(Item 10) An audio input terminal for receiving an input audio signal, a movable diaphragm, a
magnetic material having an air gap, a fixed coil for inducing a magnetic flux in the magnetic
material and the air gap, a movable coil A driver having the movable coil coupled to the
diaphragm at least partially disposed in the air gap; generating a time-varying fixed coil signal
based on the input audio signal; A control system adapted to generate a time-varying movable
coil signal based on both a time-varying fixed coil signal and the input voice signal, and a
combination based on the time-varying fixed coil signal and the time-varying movable coil signal
A combiner component adapted to provide a signal; and a fixed coil control signal responsive to
one of the time varying fixed coil signal and the composite signal. Moving coil control such that
the moving coil control signal is responsive to the other of the time varying fixed coil signal and
the combined signal, and the diaphragm moves in response to the moving coil control signal. A
filter component adapted to process the composite signal to provide a signal to the moving coil,
wherein the combiner component and the filter component are coupled from the combiner
component to the filter component An acoustic transducer, in electrical communication via a pair
of conductors, for the transmission of the composite signal. 11. The acoustic transducer of claim
10, wherein the combiner component includes one of a current regulator and a voltage regulator
for the addition of the time varying fixed coil signal to the time varying moving coil signal. 12.
The acoustic transducer of claim 11, wherein the other of the current regulator and the voltage
regulator comprises a unidirectional component and a bidirectional component. 13. The acoustic
transducer of claim 12, wherein the unidirectional component and the bidirectional component
are provided as a total component. 14. The acoustic transducer of claim 13, wherein the total
component comprises a class D power amplifier. (Item 15) The unidirectional component and the
bidirectional component are individual components. The acoustic transducer of claim 12,
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provided as (Item 16) The current regulator is a current source, the unidirectional component of
the current source includes a buck converter, and the bidirectional component of the current
source is one of a class D power amplifier and a class AB power amplifier 15. An acoustic
transducer according to item 15, including. 17. The voltage regulator is a voltage source, the
unidirectional component of the voltage source includes a buck converter, and the bidirectional
component of the voltage source includes a class D power amplifier. Acoustic transducer.
18. The acoustic transducer of claim 10, wherein the filter component is further adapted to
derive a version of the time varying fixed coil signal from the combined signal. (Item 19) A
method of operating an acoustic transducer, comprising: receiving an input audio signal;
generating a time-varying fixed coil signal based on the input audio signal; and both the timevarying fixed coil signal and the input audio signal Generation of a time-varying movable coil
signal, provision of a combined signal based on the time-varying fixed coil signal and the timevarying movable coil signal, transmission of the combined signal in a pair of conductors, and a
fixed coil control signal The fixed coil control signal is provided to the fixed coil in response to
one of the variable fixed coil signal and the time-variable movable coil signal such that the fixed
coil induces a magnetic flux in the magnetic flux path, the movable coil control signal being In
response to the other of the time-varying fixed coil signal and the other of the time-varying
movable coil signal, a movable coil is disposed within the flux path, and the movable coil is
responsive to the movable coil control signal. Providing the moving coil control signal to the
moving coil so as to be coupled to the moving movable diaphragm, and applying to the
composite signal of filtering. (Item 20) Provision of a first regulator which is one of a current
regulator and a voltage regulator, and addition of the time varying fixed coil signal to the time
varying movable coil signal using the first regulator 20. A method according to item 19,
including the provision of the composite signal. 21. The method of claim 20, wherein the first
regulator comprises a unidirectional component and a bidirectional component. 22. The method
of claim 21, wherein the unidirectional component and the bidirectional component are provided
as a total component. 23. The method of claim 22, wherein the total component comprises a
class D power amplifier. 24. The method of claim 21, wherein the unidirectional component and
the bidirectional component are provided as separate components. 25. The first regulator is a
current source, the unidirectional component of the current source includes a buck converter,
and the bidirectional component of the current source is a class D power amplifier and a class AB
power amplifier. 24. A method according to item 24, comprising one. 26. The device of claim 24,
wherein the first regulator is a voltage source, the unidirectional component of the voltage
source comprises a buck converter, and the bidirectional component of the voltage source
comprises a class D power amplifier. the method of.
(Item 27) Providing a first filter for deriving the version of the time-varying movable coil signal
from the composite signal, and a second filter for deriving the version of the time-variant fixed
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coil signal from the composite signal Item 20. The method according to item 19, comprising
providing and application of the filtering to the composite signal. (Item 28) An audio input
terminal for receiving an input audio signal, a movable diaphragm, a magnetic material having an
air gap, a fixed coil for inducing a magnetic flux in the magnetic material and the air gap, a
movable coil A driver having the movable coil coupled to the diaphragm at least partially
disposed in the air gap; generating a time-varying fixed coil signal based on the input audio
signal; A control system adapted to generate a time-varying movable coil signal based on both a
time-varying fixed coil signal and the input voice signal, and a combination based on the timevarying fixed coil signal and the time-varying movable coil signal A combiner component adapted
to provide a signal; and a fixed core responsive to one of the time varying fixed coil signal and
the time varying movable coil signal. Control signals for the stationary coil, the movable coil
control signal responsive to the other of the time-varying fixed coil signal and the other of the
time-varying movable coil signals, and the diaphragm in response to the movable coil control
signal. Providing a moveable coil control signal to the moveable coil, the filter component
adapted to process the composite signal to process the combined signal, the combiner
component and the filter component from the combiner component An acoustic transducer in
electrical communication via a pair of conductors for transmission of the composite signal to the
filter component. 29. The acoustic transducer of claim 28, wherein the combiner component
includes one of a current regulator and a voltage regulator for the addition of the time varying
fixed coil signal to the time varying moving coil signal. 30. The acoustic transducer of claim 29,
wherein the other of the current regulator and the voltage regulator comprises a unidirectional
component and a bidirectional component. 31. The acoustic transducer of claim 30, wherein the
unidirectional component and the bidirectional component are provided as a total component.
32. The acoustic transducer of claim 31, wherein the total component comprises a class D power
amplifier. 33. The unidirectional component and the bidirectional component may be separate
components.
Item 30. The acoustic transducer according to item 30, provided as 34. The current regulator is a
current source, the unidirectional component of the current source includes a buck converter,
and the bidirectional component of the current source includes a class D power amplifier and a
class AB power amplifier. The acoustic transducer as described in item 33. 35. The voltage
regulator is a voltage source, the unidirectional component of the voltage source includes a buck
converter, and the bidirectional component of the voltage source includes a class D power
amplifier. Acoustic transducer. (Item 36) A first filter for deriving the version of the time-varying
movable coil signal from the composite signal, and a second filter for deriving the version of the
time-variant fixed coil signal from the composite signal. 29. An acoustic transducer according to
item 28, wherein the filter component comprises 37. A method of operating an acoustic
transducer, comprising: receiving an input audio signal; generating a time-varying fixed coil
signal based on the input audio signal; both the time-varying fixed coil signal and the input audio
signal A method comprising: generating a time-varying movable coil signal based on the above;
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and providing a composite signal based on the time-varying fixed coil signal and the time-varying
movable coil signal. 38. The method of claim 37, including providing the composite signal
transmission of the composite signal on a pair of conductors to a transducer. (Item 39) Providing
a first regulator which is one of a current regulator and a voltage regulator, and adding the time
varying fixed coil signal to the time varying movable coil signal using the first regulator 38. A
method according to item 37, further comprising providing a composite signal. (Item 40) The
first regulator is a unidirectional component and a bidirectional component. 40. A method
according to item 39, including 41. The method of claim 40, wherein the unidirectional
component and the bidirectional component are provided as a total component. 42. The method
of claim 41, wherein the total component comprises a class D power amplifier. 43. The
unidirectional component and the bidirectional component may be separate components. 40. The
method of claim 40, provided as 44. The first regulator is a current source, the unidirectional
component of the current source includes a buck converter, and the bidirectional component of
the current source is a class D power amplifier and a class AB power amplifier. A method
according to item 43, including one. 45. The first regulator is a voltage source, the unidirectional
component of the voltage source includes a buck converter, and the bidirectional component of
the voltage source includes a class D power amplifier. Method described.
46. A method of operating an acoustic transducer, wherein a time-varying fixed coil signal is
generated based on an input voice signal, and a time-varying movable coil signal is based on both
the time-varying fixed coil signal and the input voice signal. Reception of the time-varying fixed
coil signal and the combined signal corresponding to the time-varying movable coil signal, which
are generated through the pair of conductors, and the fixed coil induce a magnetic flux in the flux
path, and are fixed. The fixed coil control signal is provided to the fixed coil such that a coil
control signal is responsive to one of the time varying fixed coil signal and the composite signal,
and a moving coil control signal is the time varying fixed coil signal and the composite signal. A
movable coil disposed in the flux path, the movable coil being coupled to a movable diaphragm
that moves in response to the movable coil control signal; Providing a control signal to the
moving coil, applying the filtering to the composite signal. 47. The method of claim 46, wherein
the application of the filtering to the composite signal includes providing a filter for processing
the composite signal to derive a version of the time-varying fixed coil signal from the composite
signal. Method described. 48. A method of operating an acoustic transducer, wherein a timevarying fixed coil signal is generated based on an input speech signal, and a time-varying
movable coil signal is based on both the time-varying fixed coil signal and the input speech
signal. Reception of the time-varying fixed coil signal and the combined signal corresponding to
the time-varying movable coil signal through a pair of conductors, and the fixed coil control
signal being the time-varying fixed coil signal and the The fixed coil control signal is provided to
the fixed coil in response to one of the time-varying movable coil signals such that the fixed coil
induces magnetic flux in the flux path, the movable coil control signal is the time-varying fixed
coil signal and In response to the other of the time-varying movable coil signals, a movable coil is
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disposed within the flux path, and the movable coil is coupled to a movable diaphragm that
moves in response to the movable coil control signal. The method comprising the application to
the synthesis signal of said providing moving coil control signal to said moving coil, filtering for.
(Item 49) A first filter for deriving a version of the time-varying movable coil signal from the
composite signal, and a second filter for deriving a version of the time-variant fixed coil signal
from the composite signal. 51. A method according to item 48, wherein the application of the
filtering to the composite signal comprises.
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