close

Вход

Забыли?

вход по аккаунту

?

JP2018518873

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2018518873
Abstract An offset cartridge microphone is provided that includes a plurality of unidirectional
microphone cartridges mounted in an offset arrangement. Various desired polarity patterns,
including toroidal polarity patterns, and / or desired steering angles may be formed by
processing audio signals from multiple cartridges. The offset arrangement of the cartridges can
include mounting the cartridges such that the cartridges are directly adjacent to one another
such that the central axes of the cartridges are offset from one another. The microphone can
have a more consistent on-axis frequency response by reducing the interference and reflection
between the cartridge interior and between the cartridges, making the desired polarity pattern
and / or the desired steering angle more uniform. Can. [Selected figure] Figure 3
オフセットカートリッジマイクロフォン
[0001]
The present application relates generally to offset cartridge microphones. In particular, the
present application relates to a microphone including a plurality of unidirectional microphone
cartridges mounted in an offset arrangement and having audio signals that can be processed to
form different polarity patterns.
[0002]
Conference environments, such as boardrooms and video conferencing environments, may
03-05-2019
1
involve the use of a microphone to capture sound from a sound source. The sound source can
include, for example, a human speaker. The captured sound can be disseminated to the viewer
through loudspeakers in the environment, television broadcasts, web broadcasts, telephonic
communications, etc. The type of microphone and its placement in a particular environment may
depend on the location of the sound source, physical space requirements, aesthetics, room layout,
and / or other considerations. For example, in some circumstances, the microphone may be
placed on a table or a platform near the sound source. In other circumstances, the microphone
may be mounted overhead, for example, to capture sound from the entire room. Thus,
microphones are available in various sizes, dimensions, mounting options, and wiring options to
meet the needs of the particular environment.
[0003]
The types of microphones that can be used for a conference can include boundary microphones
and button microphones that can be positioned on or in a surface (e.g., a table). Such a
microphone may have multiple independent polarity patterns to capture sound from multiple
sources, such as two cartridges in a single microphone to form two different polarity patterns to
capture sound from speakers on both sides. As the microphone has, it can include multiple
cartridges. Other such microphones can include multiple cartridges so that different polarity
patterns can be formed by processing the audio signal from each cartridge. These types of
microphones are versatile because they are configured to produce different polarity patterns as
required without having to physically replace the cartridge. For these types of microphones, it is
ideal to have multiple cartridges in the microphone co-located, so that each cartridge
simultaneously detects sound in the environment, but this is physically possible is not. Because of
this, these types of microphones may not form the desired polarity pattern uniformly, making the
sound ideal due to irregularities in the frequency response, interference and reflections inside
and between the cartridges. May not be imported.
[0004]
Polar patterns typical of microphones and individual microphone cartridges can include
omnidirectional, cardioid, subcardioid, supercardioid, hypercardioid, and bidirectional. The
polarity pattern chosen for a particular microphone or cartridge can depend on where the sound
source is located, the need to remove unwanted noise, and / or other considerations. In a
conferencing environment, it may be desirable for the microphone to have a toroidal polar
pattern that is omnidirectional in the plane of the microphone with nulls in an axis perpendicular
to the plane of the microphone. For example, a microphone positioned on a table and having a
03-05-2019
2
toroidal polarity pattern detects sound in all directions along the table surface, but with minimal
detection of sound above the microphone, eg, sound directed to the ceiling on the table Become.
However, existing microphones with toroidal polarity patterns are physically large, have
significant self-noise, require complex processing, and / or have inconsistent polarity patterns
over the entire frequency range, for example 100 Hz to 10 kHz. May have.
[0005]
U.S. Pat. No. 4,658,425 U.S. Pat. No. 5,297,210
[0006]
Thus, there is an opportunity for a microphone that addresses these issues.
More specifically, several that can reduce cartridge-to-cartridge interference, form a desired
polarity pattern more uniformly, form a toroidal polarity pattern, be relatively compact and
compact, and have relatively low self-noise There exists an opportunity for a microphone that
includes a uni-directional microphone cartridge.
[0007]
The present invention, inter alia, (1) reduces interference and reflections between multiple
unidirectional microphone cartridges in a microphone, and (2) uniforms the desired polarity
pattern using multiple unidirectional microphone cartridges. Designed to form (3) toroidal polar
patterns using four unidirectional microphone cartridges in a compact, low noise microphone,
and (4) to have a more consistent on-axis frequency response It is intended to solve the above
mentioned problems by providing a microphone.
[0008]
In one embodiment, the microphone can include a housing and a plurality of unidirectional
microphone cartridges mounted in the housing, each of the unidirectional microphone cartridges
having a forward facing diaphragm and a rear port .
Unidirectional microphone cartridges are mounted in the housing such that each of the
03-05-2019
3
cartridges is directly adjacent to one another, the central axes of each of the cartridges being
offset from one another.
[0009]
In another embodiment, the microphone can include a housing having a visual indicator and four
unidirectional microphone cartridges mounted within the housing, each of the cartridges having
a forward facing diaphragm and a rear port . Unidirectional microphone cartridges are directly
adjacent to one another. The microphone can also include a processor in communication with the
cartridge, wherein the processor is configured to generate a digital audio output signal
corresponding to the one or more polarity patterns from the audio signal of the cartridge. The
processor is also configured to activate the visual indicator to indicate the polarity pattern.
[0010]
In yet another embodiment, a method of processing a plurality of audio signals from a plurality
of unidirectional microphone cartridges mounted in a microphone housing using a processor has
a desired polarity pattern and / or the desired polarity pattern. Receiving a setting indicative of a
desired steering angle associated with the polarity pattern, receiving the plurality of audio signals
from the unidirectional microphone cartridge, and converting the plurality of audio signals into a
plurality of digital audio signals And generating one or more digital audio output signals
corresponding to the desired polarity pattern from the plurality of digital audio signals based on
the set values, and activating the visual indicator on the housing to obtain the desired polarity.
Indicating the pattern and / or the desired steering angle. The unidirectional microphone
cartridges are mounted directly adjacent to each other within the housing, and the central axes of
each of the unidirectional microphone cartridges are offset from one another.
[0011]
These and other embodiments and various permutations and aspects will become apparent and
more fully understood from the following detailed description and the accompanying drawings,
which illustrate various embodiments in which the principles of the present invention may be
employed. Will be done.
[0012]
03-05-2019
4
FIG. 6 is a schematic view of an exemplary conferencing environment including a microphone
having a plurality of unidirectional microphone cartridges, according to some embodiments.
FIG. 7 is a schematic top view of the inside of a microphone having two unidirectional
microphone cartridges in an offset configuration, according to some embodiments. FIG. 5 is a
schematic top view of the interior of a microphone having four unidirectional microphone
cartridges in an offset configuration, according to some embodiments. FIG. 7 is a schematic
perspective view of an exemplary housing of a microphone having four unidirectional
microphone cartridges in an offset configuration, according to some embodiments. FIG. 7 is a
schematic top view of an exemplary housing of a microphone having different patterns of
actuated visual indicators in accordance with some embodiments. FIG. 7 is a schematic top view
of an exemplary housing of a microphone having different patterns of actuated visual indicators
in accordance with some embodiments. FIG. 7 is a schematic top view of an exemplary housing of
a microphone having different patterns of actuated visual indicators in accordance with some
embodiments. FIG. 7 is a schematic top view of an exemplary housing of a microphone having
different patterns of actuated visual indicators in accordance with some embodiments. According
to some embodiments, processing audio signals from a plurality of unidirectional microphone
cartridges to generate one or more digital audio output signals corresponding to one or more
desired polarity patterns It is a flowchart which shows operation | movement. FIG. 6 is a
flowchart illustrating operations for processing audio signals from a plurality of unidirectional
microphone cartridges to generate digital audio output signals corresponding to toroidal polarity
patterns, according to some embodiments.
[0013]
The following detailed description describes, illustrates, and illustrates one or more specific
embodiments of the present invention in accordance with the principles of the present invention.
This description is not intended to limit the invention to the embodiments described herein, but
rather to those skilled in the art to understand the principles of the invention and to apply these
principles as described herein. Not only the embodiments, but also other embodiments recalled
based on these principles can be provided to illustrate and teach the principles of the present
invention. The scope of the present invention is intended to protect all such embodiments that
may be included within the scope of the appended claims, either literally or under equivalence.
[0014]
03-05-2019
5
In the specification and drawings, the same or substantially the same elements are denoted by
the same reference numerals. However, when the description is made clearer, for example, by
different numbers, these elements may be different numbers. In addition, the drawings shown
herein are not necessarily to scale, and in some cases the proportions may be exaggerated to
more clearly illustrate particular features. Such notations and constructions do not necessarily
imply an underlying real purpose. As mentioned above, this specification is intended to be
generally received and interpreted in accordance with the principles of the present invention as
taught herein and understood by one of ordinary skill in the art.
[0015]
The microphones described herein use a plurality of unidirectional microphone cartridges in an
offset arrangement to reduce the interference and reflection between the interior of these
cartridges and those cartridges to achieve the desired polarity pattern and The desired steering
angle of the desired polarity pattern can be formed uniformly. Also, the microphone can have a
more consistent on-axis frequency response. The microphone has the flexibility to form many
different types of polar patterns, which may be desirable in various conferencing environments,
including toroidal polar patterns. The polar pattern steerable by the microphone is a first order
polarity pattern, ie defined by a first order periodic function and a scalar adder. Thus, the user
can configure the microphone as desired to form steering angles associated with different polar
patterns and / or polar patterns that necessarily result, for example, by the positioning of human
speakers or other sound sources . The microphone is relatively compact and can be used in place
of multiple microphones with dedicated polarity patterns. Thus, the present microphones may be
attractive from an aesthetic point of view while allowing for optimal capture of sounds from
speakers and other sources in many different situations and environments.
[0016]
FIG. 1 is a schematic diagram of an exemplary conferencing environment 100 that can use the
microphones described herein. The environment 100 may be, for example, a conference room or
a boardroom, where a microphone 102 is utilized to capture sound from a sound source, such as
a human speaker. Other undesirable sounds may be present in the environment, such as noise
from free discussion, other people, audio / visual devices, electronic devices, etc. In typical
situations, the sound source may be seated in a table chair, although other configurations and
arrangements of sound sources are contemplated and feasible.
03-05-2019
6
[0017]
The one or more microphones 102 may, for example, be placed on a table or on a table so that
sound from a source such as speech spoken by a human speaker may be detected and captured.
The microphone 102 can include a plurality of unidirectional microphone cartridges in an offset
configuration, such that the microphone forms a plurality of polar patterns and / or
corresponding steering angles, as described in detail below. It can be configured so that the
sound from the sound source is optimally detected and captured. Polar patterns that can be
formed by the microphone 102 can include omnidirectional, cardioid, subcardioid, supercardioid,
hypercardioid, bi-directional, and / or toroidal. In some embodiments, the unidirectional
microphone cartridges in the microphones 102 can each be an electret condenser microphone
with a cardioid polarity pattern and a rear port. In other embodiments, unidirectional
microphone cartridges can have other polarity patterns and / or can be dynamic microphones,
ribbon microphones, piezoelectric microphones, and / or other types of microphones. In
embodiments, the desired polarity pattern and / or the desired steering angle formed by the
microphone 102 may be configured by the user via software.
[0018]
Each of the unidirectional microphone cartridges in the microphone 102 can detect sound and
convert this sound into an analog audio signal. Components in the microphone 102, such as an
analog to digital converter, a processor, and / or other components, may process the analog
audio signal to ultimately generate one or more digital audio output signals. In some
embodiments, the digital audio output signal may conform to the Dante standard, which
transmits audio through Ethernet, or may conform to another standard. One or more polarity
patterns may be formed by the processor at the microphone 102 from the audio signal of the
unidirectional microphone cartridge, which may generate digital audio output signals
corresponding to each of the polarity patterns. In another embodiment, the unidirectional
microphone cartridge in the microphone 102 processes analog audio signals from the
microphone 102 with other components and devices (eg, processor, mixer, recorder, amplifier,
etc.) external to the microphone 102. Analog voice signals can be output, as can be done.
[0019]
Also, in some embodiments, the processor may also mix audio signals from the unidirectional
03-05-2019
7
microphone cartridge to produce a mixed digital audio output signal. For example, the processor
can mix the audio signal of the unidirectional microphone cartridge by monitoring whether a
particular polarity pattern is active. If the particular polarity pattern formed by the microphone
102 is active, other polarity patterns can be muted. In this way, the desired audio mix can be
output from the processor such that the targeted sound source is enhanced and other sound
sources are suppressed. Embodiments of the audio mixer are disclosed in co-owned patents of
the present invention, i.e., U.S. Patent Nos. 4,658,425 and 5,297,210, each of which is
incorporated by reference. Is hereby incorporated by reference in its entirety.
[0020]
The bridge device 104 may be in wired or wireless communication with the microphone 102 to
receive the digital audio output signal from the microphone 102. The bridge device 104 may also
communicate with the network 106 (eg, voice over IP network, telephone network, local area
network, internet, etc.) and / or loudspeakers 108 in a wired or wireless manner. In particular,
the bridge device 104 can receive a digital audio output signal from the microphone 102,
convert the digital audio output signal, and transmit it over the network 106, such as to a remote
party via telephony. The digital audio output signal from the microphone 102 can also be
converted to an analog audio signal that can be heard through the loudspeaker 108. The bridge
device 104 can include controls for adjusting the parameters of the microphone 102 such as
polarity pattern, gain, noise suppression, muting, frequency response, and the like. In some
embodiments, the electronic device can communicate with the microphone 102 and / or the
bridge device 104 to control such parameters. The electronic device can include, for example, a
smartphone, a tablet computer, a laptop computer, a desktop computer, and the like.
[0021]
FIG. 2 is a schematic top view of the interior of a microphone 200 having two unidirectional
microphone cartridges 202, 204 in an offset configuration. The microphone 200 has a housing
250 in which two unidirectional microphone cartridges 202, 204 are mounted. The housing 250
shown in FIG. 2 is intended to show a viable envelope for the unidirectional microphone
cartridge 202, 204 and is shown as being circular, but any suitable shape and / or dimensions Is
contemplated and feasible. The housing 250 may be a user interface component (not shown)
such as a switch, button, and / or visual indicator, and / or a grill or other cover (not shown) over
the unidirectional microphone cartridge 202, 204. Can be included. The cartridges 202, 204 can
be mounted within the housing 250 using any suitable method and technique known and utilized
in the art.
03-05-2019
8
[0022]
In some embodiments, the unidirectional microphone cartridges 202, 204 can each be an
electret condenser microphone cartridge having a cardioid polarity pattern and rear ports 214,
216. The unidirectional microphone cartridges 202, 204 can each have a diaphragm 206, 208
present on the front of each cartridge to detect sound. Analog audio signals may be output from
each of the unidirectional microphone cartridges 202, 204. A processor (not shown) internal to
the microphone 200 and / or external to the microphone 200 can process the audio signals from
the unidirectional microphone cartridges 202, 204 to form various polarity patterns. The polar
pattern can be configured by the user as desired to optimally capture sound from the sound
source depending on the particular environment.
[0023]
As seen in FIG. 2, the unidirectional microphone cartridges 202, 204 are mounted within the
housing 250 such that the cartridges are adjacent to one another. In particular, at least a portion
of the rear port 214 faces at least a portion of the rear port 216, and the diaphragms 206, 208
of the cartridges 202, 204 face outwardly towards the housing 250. The central axes 210, 212
of the unidirectional microphone cartridges 202, 204 can each be offset from one another such
that the unidirectional microphone cartridges 202, 204 are not coaxial. Further, in some
embodiments, central axes 210, 212 of unidirectional microphone cartridges 202, 204 are such
that the unidirectional microphone cartridges 202, 204 are not collinear with the center of
microphone 200, It can be offset from the center of the housing 250 (shown as "X" in FIG. 2).
The unidirectional microphone cartridges 202, 204 in the microphone 200 are not limited to the
configuration shown in FIG. It is.
[0024]
By locating the unidirectional microphone cartridge 202, 204 in the microphone 200 as shown
in FIG. 2, the unidirectional microphone cartridge 202, 204 and any other components within the
housing 250 (shown in FIG. And the influence of the interaction between them) can be
minimized. For example, the interior of the unidirectional microphone cartridges 202, 204 and
reflections between these cartridges can be mitigated by the offset arrangement of the cartridges.
In addition, the polar pattern formed by the unidirectional microphone cartridge 202, 204 can be
03-05-2019
9
more uniform and maintain it due to the cartridge being offset.
[0025]
FIG. 3 is a schematic top view of the inside of a microphone 300 having four unidirectional
microphone cartridges 302, 304, 306, 308 in an offset configuration. The microphone 300 has a
housing 350 in which four unidirectional microphone cartridges 302, 304, 306, 308 are
mounted. The housing 350 shown in FIG. 3 is intended to show a viable envelope for a
unidirectional microphone cartridge 302, 304, 306, 308, and is shown as being circular, but any
suitable shape and And / or dimensions are contemplated and feasible. The housing 350 may be
a user interface component (not shown) such as a switch, button, and / or visual indicator and /
or a grill or other above the unidirectional microphone cartridge 302, 304, 306, 308 A cover
(not shown) can be included. The cartridges 302, 304, 306, 308 can be mounted within the
housing 350 using any applicable suitable method and technique known and utilized in the art.
[0026]
In some embodiments, the unidirectional microphone cartridges 302, 304, 306, 308 can be
electret condenser microphone cartridges having a cardioid polarity pattern and rear ports 326,
328, 330, 332, respectively. Unidirectional microphone cartridges 302, 304, 306, 308 can have
diaphragms 310, 312, 314, and 316, respectively, present on the front of each cartridge to
detect sound. Analog audio signals can be output from each of the unidirectional microphone
cartridges 302, 304, 306, 308. A processor (not shown) internal to microphone 300 and / or
external to microphone 300 processes the audio signals from the unidirectional microphone
cartridges 302, 304, 306, 308 to form various polarity patterns. be able to. The polar pattern can
be configured by the user as desired to optimally capture sound from the sound source
depending on the particular environment.
[0027]
As seen in FIG. 3, the unidirectional microphone cartridges 302, 304, 306, 308 are mounted
within the housing 350 generally vertically adjacent one another. In particular, at least a portion
of each of the rear ports 326, 328, 330, 332 faces adjacent to at least a portion of the sides of
the adjacent unidirectional microphone cartridge 302, 304, 306, 308; On the other hand, the
diaphragms 310, 312, 314 and 316 face outward towards the housing 350. The cartridge 302 is
03-05-2019
10
oriented at a 0 degree orientation, at least a portion of the rear port 326 of the cartridge faces
adjacent the side of the cartridge 304, and the cartridge 304 is oriented at a 90 degree
orientation. At least a portion of the rear port 328 of the cartridge faces the side of the cartridge
306, the cartridge 306 is oriented in a 180 degree orientation, and at least a portion of the rear
port 330 of the cartridge is on the side of the cartridge 308 Adjacent facing, the cartridge 308 is
oriented at a 270 degree orientation, and at least a portion of the rear port 332 of the cartridge
faces adjacent to the side of the cartridge 302.
[0028]
The central axes 318, 320, 322, and 324 of the unidirectional microphone cartridges 302, 304,
306, 308, respectively, can be offset from one another. Further, in some embodiments, central
axes 318, 320, 322, and 324 may be housing 350 such that unidirectional microphone
cartridges 302, 304, 306, 308 are not aligned with the center of microphone 300. Can be offset
from the center of (shown as “X” in FIG. 3) The unidirectional microphone cartridges 302,
304, 306, 308 in the microphone 300 are not limited to the configuration shown in FIG. 3 and
other arrangements of the cartridges 302, 304, 306, 308 in the microphone 300 and Orientation
is also contemplated and feasible.
[0029]
By positioning the unidirectional microphone cartridge 302, 304, 306, 308 in the microphone
300 as shown in FIG. The impact of interaction with some other component (not shown) can be
minimized. For example, the interior of the unidirectional microphone cartridges 302, 304, 306,
308 and reflections between these cartridges can be mitigated by the offset arrangement of the
cartridges. In addition, the polar pattern and / or steering pattern formed by the unidirectional
microphone cartridge 302, 304, 306, 308 is more uniform and maintains it due to the cartridge
being offset. Can.
[0030]
FIG. 4 is a perspective view of an exemplary housing of a microphone 400 having four
unidirectional microphone cartridges in an offset configuration, such as the configuration shown
in FIG. The microphone 400 is a grill 402 above the cartridge to protect the cartridge and reduce
unwanted noise, switches and / or buttons (not shown) for controlling and muting the
03-05-2019
11
microphone 400, and / or vision Indicator 404 can be included. Visual indicator 404 is a multicolored LED ring that can be activated during use of microphone 400, such as, for example, when
there is an incoming call, when the microphone is active, when the microphone is muted, etc be
able to. In some embodiments, some or all of the visual indicators 404 can be illuminated,
flashing, and / or display in different colors depending on the status and / or use of the
microphone 400. Also, the visual indicator 404 can operate independently in different sections to
display the polar pattern and / or steering angle of the microphone 400. Depending on the
desired polarity pattern and / or the setting for the desired steering angle, a processor or other
suitable component in the microphone 400 may vary the visual indicator 404 to convey where
the polarity pattern is formed. Can be activated (eg, illuminated) in any manner. Thus, the user of
the microphone 400 can be given information regarding the configuration of the microphone
400 and properly position himself around the microphone 400 such that the user's speech is
optimally detected and captured.
[0031]
Such visual indicators can be actuated in different ways to reflect the selected polarity pattern of
the microphone and / or the steering angle, as schematically shown in FIGS. 5A to 5D. For
example, as shown in FIG. 5A, a single section of the visual indicator can be activated when a
single cardioid polar pattern oriented at 0 degrees is formed. In FIG. 5B, when a bi-directional
polar pattern oriented at 0 degrees and 180 degrees is formed, as shown, two separate sections
of the visual indicator can be activated. As shown in FIG. 5C, four distinct sections of the visual
indicator can be activated when four cardioid polar patterns oriented at 0 degrees, 90 degrees,
180 degrees, and 270 degrees are formed. . Furthermore, in FIG. 5D, three separate sections of
the visual indicator can be activated when three cardioid polar patterns oriented at 0 degrees,
120 degrees, and 240 degrees are formed. The visual indicators shown in FIGS. 5A-5D are
exemplary and, depending on the selected polar pattern of the microphone and / or the steering
angle, other actuation patterns of the visual indicator are also contemplated and feasible. .
[0032]
Referring now to FIG. 6, a method 600 of processing audio signals from a plurality of
unidirectional microphone cartridges in a microphone to generate a digital audio output signal
corresponding to a desired polarity pattern according to one or more principles of the present
invention. An embodiment of is shown. Method 600 can be used, for example, to process audio
signals from a plurality of unidirectional microphone cartridges in microphones 200 and 300, as
described above and shown in FIGS. One or more processors and / or other processing
03-05-2019
12
components (eg, an analog-to-digital converter, an encryption chip, etc.) inside or outside the
microphone perform any or all of the steps of method 600. Can. Also, one or more other types of
components (eg, memory, input and / or output devices, transmitters, receivers, buffers, drivers,
discrete components, etc.) may be part of any of the steps of method 600. Or may be used in
combination with a processor and / or other processing components to perform the entire
operation.
[0033]
At step 602, a setting may be received regarding a desired polarity pattern and / or a desired
steering angle of the desired polarity pattern. This setting may be received, for example, from a
bridge device, electronic device, and / or other control device in communication with the
microphone. The microphone user can configure the settings as desired to optimally capture the
sound from the sound source depending on the particular environment. Desired polar patterns
can include, for example, omnidirectional, cardioid, subcardioid, supercardioid, hypercardioid, bidirectional, and / or toroidal. In some embodiments, the desired polarity pattern can be steered
to any desired angle depending on the particular polarity pattern. For example, while cardioid,
subcardioid, supercardioid, and hypercardioid polar patterns can be steered to different angles,
omnidirectional, bi-directional, and toroidal polar patterns are not steerable. In embodiments, the
desired steering angle may be selectable in certain increments, for example 15 degrees, as easily
configured by the user. The possible settings for the desired polarity pattern and / or the desired
steering angle may depend on the configuration of the plurality of unidirectional microphone
cartridges in the microphone. For example, a microphone having two unidirectional microphone
cartridges, such as the microphone 200 described in FIG. 2, may steer the desired polarity
pattern or generate a digital audio signal corresponding to the toroidal polarity pattern. It may
not be possible. However, a microphone having four unidirectional microphone cartridges, such
as the microphone 300 described in FIG. 3, generates any desired polarity pattern including
toroidal polarity patterns to steer a particular desired polarity pattern. be able to.
[0034]
The audio signals from the plurality of unidirectional microphone cartridges at the microphone
can be processed to form a desired polarity pattern and / or a desired steering angle. At step
604, the analog audio signal from each of the unidirectional microphone cartridges in the
microphone can be received and converted to a digital audio signal, such as by an analog to
digital converter. At step 606, it may be determined whether the setting for the desired polarity
pattern received at step 602 is a toroidal polarity pattern. If the setting for the desired polarity
03-05-2019
13
pattern is a toroidal polarity pattern, method 600 can proceed to step 622 to form the toroidal
polarity pattern from the audio signal of the unidirectional microphone cartridge. Step 622 is
described in more detail in FIG.
[0035]
However, if, at step 606, the settings for the desired polarity pattern are not for the toroidal
polarity pattern, method 600 can proceed to step 608. At step 608, a gain factor for each of the
digital audio signals may be identified such that a desired polarity pattern and / or a desired
steering angle is generated based on the settings received at step 602. The identified gain factors
may be applied to the digital audio signal at step 610. Also, at step 610, the resulting digital
audio signal and the applied gain factor may be added together to generate a pattern audio
signal. Each of the pattern audio signals generated in step 610 may correspond to each of a
desired polarity pattern and / or a desired steering angle.
[0036]
At step 612, it may be determined whether to mix the pattern audio signal. In some
embodiments, such as via the settings received at step 602, it may be configurable by the
microphone user whether to mix the pattern audio signal. If the pattern audio signal is mixed,
method 600 proceeds to step 614 where the pattern audio signal is mixed to generate a mixed
audio signal. At step 616, the mixed audio signal may be output as a digital audio output signal.
However, if the pattern audio signal is not mixed in step 612, method 600 proceeds to step 618
and outputs the pattern audio signal generated in step 610 as a digital audio output signal. The
digital audio output signal output at steps 616 and 618 may, for example, conform to the Dante
standard for transmitting audio over Ethernet. In some embodiments, the visual indicator on the
microphone can be actuated at step 620 to indicate a desired polarity pattern and / or a desired
steering angle based on the settings received at step 602. Different patterns for activating the
visual indicator are described and illustrated in FIGS. 5A to 5D.
[0037]
As one example of the method 600, if the desired polar pattern and / or the setting for the
desired steering angle is a single cardioid directed to 0 degrees, from each of the unidirectional
microphone cartridges in the microphone A's analog audio signal can be used to generate a
03-05-2019
14
single digital audio output signal corresponding to the single cardioid polarity pattern. In
addition, a single section of the visual indicator on the microphone can be operated at 0 degrees
similar to that shown in FIG. 5A. As another example, if the settings for the desired polar pattern
and / or the desired steering angle are four cardioid polar patterns pointing at 0 degrees, 90
degrees, 180 degrees, and 270 degrees, then at the microphone The analog audio signals from
each of the unidirectional microphone cartridges can be used to generate four digital audio
output signals (or a single digital audio output signal, if desired). Each of the four digital audio
output signals may correspond to four cardioid polarity patterns. The four sections of the visual
indicator on the microphone can operate at 0 degrees, 90 degrees, 180 degrees, and 270
degrees, similar to that shown in FIG. 5C. As yet another example, if the setting for the desired
polarity pattern is a bi-directional pattern, analog voice signals from each of the unidirectional
microphone cartridges at the microphones are used to correspond to the bi-directional polarity
pattern A digital audio output signal can be generated. The two sections of the visual indicator on
the microphone can operate at 0 degrees and 180 degrees, similar to that shown in FIG. 5B.
[0038]
FIG. 7 shows further details of an embodiment of step 622 for forming a toroidal polarity pattern
from audio signals of a unidirectional microphone cartridge. In this embodiment, the microphone
can have four unidirectional microphone cartridges in an offset configuration, similar to the
microphone 300 shown in FIG. At step 702, digital audio signals of two of the unidirectional
microphone cartridges are respectively subtracted from digital audio signals of two opposing
unidirectional microphone cartridges to produce two bidirectional pattern signals. Do. The two
bi-directional pattern signals correspond to two bi-directional polar patterns formed
perpendicular to one another. For example, in the configuration shown in FIG. 3, digital audio
signals of a unidirectional microphone cartridge (i.e., cartridge 306) positioned at 180 degrees
are opposite an opposed unidirectional microphone cartridge positioned at 0 degrees. The digital
audio signal of (ie, cartridge 302) is subtracted to produce a first bi-directional pattern signal.
The digital audio signal of a unidirectional microphone cartridge (ie, cartridge 308) positioned at
270 degrees is subtracted from the digital audio signal of the opposing unidirectional
microphone cartridge (ie, cartridge 304) positioned at 90 degrees To generate a second bidirectional pattern signal.
[0039]
At step 704, the first bi-directional pattern signal may be delayed to generate a delayed first bidirectional pattern signal. At step 704, the first bi-directional pattern signal is delayed to align in
03-05-2019
15
time with the phase shifted second bi-directional pattern signal generated at step 706. At step
706, the second bi-directional pattern signal is phase shifted by 90 degrees to produce a phase
shifted second bi-directional pattern signal. For example, a Hilbert transform of the second bidirectional pattern signal (or a finite impulse response approximation of the Hilbert transform)
can be used to produce a 90 degree phase shift. Thus, the first bi-directional pattern signal is
linearly shifted (with delay) without being phase-shifted, and the second bi-directional pattern
signal is phase-shifted by 90 degrees.
[0040]
At step 708, the delayed first bi-directional pattern signal and the phase shifted second bidirectional pattern signal may be added to generate a toroidal pattern signal. At step 710, low cut
filtering the toroidal pattern signal to generate a filtered toroidal pattern signal to ensure that the
frequency responses of the first and second bidirectional polar patterns are not significantly
different from one another Can. At step 712, the filtered toroidal pattern signal may be output as
a digital audio output signal. The digital audio output signal output at step 712 may, for example,
conform to the Dante standard for transmitting audio over Ethernet. In some embodiments, at
step 714, the visual indicator on the microphone can be activated to indicate a toroidal polarity
pattern based on the settings received at step 602.
[0041]
It is understood that any method description or block in the figures may represent a module,
segment or code portion that includes one or more executable instructions for performing a
particular logical function or step in the method. And other implementations that can perform
the functions in a different order than illustrated or described, including substantially
simultaneous or reverse sequences, depending on the functions involved, as should be
understood by those skilled in the art Is included within the scope of the embodiments of the
present invention.
[0042]
This disclosure is intended to describe how to construct and use various embodiments in
accordance with the techniques of this invention, and to limit the true intended fair scope and
spirit of this invention. is not.
03-05-2019
16
The above description is not intended to be exhaustive or to be limited to the precise forms
disclosed. Modifications or variations are possible in light of the above teachings. The
embodiments provide an optimal illustration of the principles of the described technology and its
possible applications, and various modifications that are suitable to one skilled in the art in the
various embodiments and for the particular application contemplated. It has been selected and
described as being available in a form. All such modifications and variations are properly and
equitably provided that the embodiments defined by the appended claims, which may be
amended during the process of the present application, and such embodiments It is included
within the scope of all equivalents of the embodiments when interpreted according to the terms
and conditions.
[0043]
300 microphones 302, 304, 306, 308 unidirectional microphone cartridges 310, 312, 314, 316
diaphragms 318, 320, 322, 324 central axes 326, 328, 330, 332 rear port 350 housing
03-05-2019
17
Документ
Категория
Без категории
Просмотров
0
Размер файла
31 Кб
Теги
jp2018518873
1/--страниц
Пожаловаться на содержимое документа