Creative | Handsfree with Bluetooth Technology CB2455 | Microphone techniques

US007920903B2
(12) Ulllted States Patent
(10) Patent N0.:
Ueda et a].
(54)
(45) Date of Patent:
MICROPHONE TECHNIQUES
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6,975,984 B2
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(75) Inventors‘ gjiUe‘illa’gimgnqglf’llsa/ligglssxDavld
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or a Juste
6/2006
Kates ............................ .. 381/60
9/2006
Nagayasu etal.
B2*
3/2007
3/2007 Johnston et al.
7,215,766 B2*
5/2007 WllI‘tZ ......................... .. 379/430
7/2007 Eves
B1
7,395,090 B2
7,433,715 B2
(21)
App1.N6.; 11/619,992
(22)
Wed‘
-
Jan‘ 4’2007
_
_
_
Prlor Publlcatloll Data
US 2008/0167092 A1
8/2007
Klein
110007 Lehtonen
3/2008 Bernardi e1 a1.
7/2008 Alden
10/2008 Buckley e1 al.
7,720,232 B2* 5/2010 Oxford ......................... .. 381/66
2001/0050991 A1
12/2001 Eves
.
(65)
Alden
7,251,332 B2
7,346,176 B1
USC 15402) by 646 days-
2/2007 Fry
7,190,797 B1
7,292,880 B2
un er 35
....... .. 455/5752
12/2006 s1ni11ieis etal.
7,187,948 B2
7,254,420
Subject'to any ((111s(c1la1me5,the:1ermdofth1s
Patent 15 exten e
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7,110,800
7,181,233 B2
Ass1gnee: Bose Corporation, Frammgham, MA
Apr. 5, 2011
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7,155,214 B2
_
( ) Notice.
US 7,920,903 B2
2001/0050993 A1
12/2001
2001/0053228 A1
12/2001 Jones
2002/0003889 A1
1/2002
2002/0102005 A1
8/2002 Lin
Jul. 10, 2008
(51)
Int. Cl.
(52)
H041)’ 1/00
(2006-01)
us. Cl. .............. .. 455/5751; 455/5691; 455/5752
(58)
Field of Classi?cation Search ...... .. 455/41.14l1.3,
Douglas
Fischer
(Continued)
FOREIGN PATENT DOCUMENTS
DE
455/569-1, 569-2, 5752
20 2006 004625
6/2006
(Continued)
OTHER PUBLICATIONS
See application ?le for complete search history.
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(Continued)
(56)
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Primary Examiner * Simon D Nguyen
(57)
ABSTRACT
Among other features, a boom microphone has a microphone
connector; an earcup module includes an earcup connector
jack to connect to a headphone and a boom lead-in to receive
the microphone connector; and a control module communi
cates Voice signals Wirelessly between (a) the boom micro
phone and headphone and (b) a telephone.
10 Claims, 7 Drawing Sheets
US 7,920,903 B2
Page 2
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* cited by examiner
US. Patent
F359,
Apr. 5,2011
Sheet 1 017
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US. Patent
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US 7,920,903 B2
1
2
MICROPHONE TECHNIQUES
Implementations may include one or more of the folloWing
features. There is a connector betWeen the microphone and
the headphone. The microphone includes a boom micro
BACKGROUND
phone.
In general, in an aspect, a microphone is connectable to a
This description relates to microphone techniques.
noise canceling headphone, and a controller separate from the
microphone is connectable to the noise canceling headphone
SUMMARY
and to the microphone. The controller includes a Wireless
transceiver to communicate microphone and headphone sig
In general, in an aspect, a boom microphone has a micro
nals to and from a telephone set.
In general, in an aspect, a microphone is attachable to and
phone connector; an earcup module includes an earcup con
nector jack to connect to a headphone and a boom lead-in to
detachable from the headphone and adapted to draW current
from a poWer source in the headphone. Circuitry determines
the connection state of the microphone to the headphone
based on detecting the draWing of current.
receive the microphone connector; and a control module
communicates voice signals Wirelessly betWeen (a) the boom
microphone and headphone and (b) a telephone.
Implementations may include one or more of the following
Implementations may include one or more of the folloWing
features. The microphone connector is non-axisymmetric.
There is a poWer connection to carry poWer from a poWer
source in the headphone through the earcup connector jack to
the poWered circuitry. The control module is adapted to equal
iZe the voice signals from the boom microphone. The control
20
module is adapted to determine is the boom microphone is
attached to the earcup module. The control module includes a
connector adapted to carry a signal from an audio player to the
headphone. The control module is adapted to automatically
25
mute the signal from an audio player When an incoming call
features. The microphone includes a noise canceling micro
phone. The poWer source includes a battery. The circuitry
includes a unit that is separate from the headphone and the
microphone. The circuitry disconnects a telephone call When
it determines that the microphone has been disconnected.
In general, in an aspect, a microphone is attachable to and
detachable from the headphone, and circuitry communica
tions microphone and headphone signals to and from a tele
phone set and disconnects a telephone call in progress at the
telephone set if the microphone is detached during the call.
is received by the cell phone. The control module further
Implementations may include one or more of the folloWing
includes a Wireless module for managing communication
With the cell phone. The Wireless module includes a Blue
tooth module.
In general, in an aspect, a headphone includes a poWer
source, a microphone is attachable to the headphone, control
circuitry not in the headphone controls use of audio signals
features. The circuitry includes Wireless communication cir
cuitry to communicate the signals. The circuitry includes a
unit that is separate from the microphone and the headphone.
30
In general, in an aspect, a connector attaches a microphone to
and detaches the microphone from a headphone non-axi
associated With the microphone and the headphone, and there
is a poWer connection betWeen the poWer source of the head
35
phone and the control circuitry.
symmetrically, and the connector is con?gured to cause the
microphone to have the same orientation relative to the mouth
after the microphone is detached to the headphone as the
orientation that existed When the microphone Was previously
attached to the headphone.
Implementation may include one or more of the folloWing
features. The headphone includes noise canceling circuitry.
Implementations may include one or more of the folloWing
The control circuitry controls audio signals used for tele
phone calls that are passed Wirelessly to and from a telephone
features. An orientation of the microphone relative to the
mouth of a person Wearing the headphone can be adjusted
40
using a gooseneck. The microphone comprises a boom
set. The poWer connection includes conductors of a cable. The
poWer source includes a battery. The microphone includes a
boom microphone. There is a connector betWeen the micro
microphone. The connector and the microphone connect non
aXi-symmetrically.
phone and the headphone.
In general, in an aspect, signals are received from a micro
phone, the signals being representative of a voice of a user
45
Wearing an active noise reducing headphone. The received
electrical signals are processed to produce derived signals
representative of the voice. The derived signals are delivered
to a transducer in the headphone to be played to the user. The
In general, in an aspect, a connector attaches a microphone
to and detaches the microphone from a headphone, the con
nector having a non-axisymmetric cross-section.
In general, in an aspect, circuitry has ports for connection
50
to a telephone set to carry telephone audio signals, to a music
source to carry music audio signals, to a headphone to play
audio signals, and to a microphone to convert speech to audio
signal processing causes the derived signals to be natural
signals, the circuitry being con?gured to detect an incoming
reproductions of the user’s voice as played to the user.
Implementations may include one or more of the folloWing
phone call While music audio signals from the source are
being played in the headphone and to sWitch audio signals
played by the headphone from the music audio signals to the
features. The microphone is attachable to the headphone. The
signal processing includes equalization. The signal process
55
ing includes level setting. The signal processing is based on
con?guration information provided by the user.
In general, in an aspect, microphone signals are received
Implementations may include one or more of the folloWing
features. The circuitry is separate from the headphone, the
telephone set, the music source, the headphone, and the
microphone. The connection to the telephone set is Wireless.
that are representative of a voice of a user Wearing a head
phone, and the received signals are equalized in accordance
60
from the user’ s mouth via the headphone to an ear of the user
multiplied by a transfer function of sound traveling a path
from the user’ s mouth to the user’ s ear, absent the headphone.
headphone.
In general, an aspect includes detecting When a micro
phone associated With a headphone is no longer providing
voice signals for one side of a telephone call, and in response
to the detecting, terminating the telephone call.
With an inverse of a transfer function of sound traveling a path
In general, in an aspect, a shielded noises canceling micro
phone is attachable to and detachable from a noise canceling
telephone audio signals.
Implementations may include one or more of the folloWing
65
features. The detecting includes electronically determining
When the microphone has been detached from the headphone.
Terminating the call includes sending a hand up indication
US 7,920,903 B2
3
4
from a controller associated With the headphone. The hang up
indication is sent Wirelessly to a telephone set.
These and other features and aspects and combinations of
them may be expressed as apparatus, methods, systems,
means for performing a function, program products, and in
other Ways.
Other advantageous and features Will become apparent
The microphone 14 is a commercial noise canceling micro
phone available from vendors such as Knowles Acoustics of
Itasca, Ill. The length of cable 16 (Which is not shoWn to scale
in FIG. 1) is, in some examples, about 20 cm. A plastic
housing 34 supporting the microphone may alloW stray elec
trical signals to interfere With the electrical signal represent
ing the sound received by the microphone. The microphone
may be electrically shielded by inserting a grounded conduc
tor (not shoWn) betWeen the plastic housing and microphone.
from the folloWing description and from the claims.
The grounded conductor may be disposed on the plastic hous
ing or on the microphone and may be grounded by the ground
lead from the microphone.
The microphone 14 (Which is hidden in FIG. 1) is held on
DESCRIPTION
FIG. 1 is a front vieW of a microphone accessory.
FIG. 2 is a front vieW, partially broken aWay of a micro
phone accessory and headphones.
one end 36 of a microphone boom 38. The other end 40 of the
boom is coupled to a microphone connector 42 (Which We
also sometimes call a boom connector). The microphone
connector 42 is seated Within a lead-in receptacle 44 of an
FIGS. 3 and 4 are perspective vieWs of an earcup module.
FIG. 5 is a perspective vieW of a control module.
FIG. 6 is a perspective vieW of a dummy Wearing head
phones.
FIG. 7 is a block diagram of control module circuitry.
As shoWn in FIGS. 1 and 6, a microphone accessory 10 for
a set of headphones 12, such as Bose Quiet Comfort 3 head
20
phones or any other kind of active noise canceling or non
noise canceling headphone or headphones (including sur
rounding the ear, on the ear, or in the ear), provides Bluetooth
(or other) Wireless connectively of the headphones 12 and a
microphone 14 to a Bluetooth (or other)-enabled cell phone
15 (not shoWn to scale). (We sometimes use the plural head
phones to refer also to a signal headphone.) The cable (not
25
and the lead-in are non-axisymmetric around an axis that lies
shoWn) that is normally supplied With the headphones is
replaced by a cable 16 heaving a detachable microphone
earcup module 46. For attaching and removing the boom
microphone to and from the earcup module 46, the connector
42 can be guided into a lead-in receptacle 44 (FIG. 2) of the
earcup module 46. The boom microphone connector is con
toured (as shoWn in FIG. 3) to match a contoured internal Wall
of the earcup module lead-in to preserve the orientation and
position of the microphone relative to the user’s mouth When
the boom microphone is detached from and reattached to the
earcup module.
The cross-sectional contour of the microphone connector
along the length of the microphone boom to alloW the con
30
boom assembly 18 at one end 20 and, at the other end 22, a
nector to ?t into the boom lead-in in only one orientation, as
shoWn in FIG. 3. The proper orientation could also be
control module 24 that houses circuitry 25 (FIG. 7) to control
enforced by a slot-key con?guration in Which the key ?ts in
the use of the microphone, the headphones, and the Wireless
connectivity With the cell phone, among other things; a Blue
tooth transceiver module 27 (FIG. 7), and an input jack 26 to
receive a stereo music (or other) audio signal from a music (or
the slot to prevent rotation of the key beyond the con?nes of
the slot. The slot may be located on the boom connector or the
35
other audio) source 28 (not shoWn to scale) such as an MP3
player, a CD player, or a radio.
the noise canceling microphone relative to his mouth and
The accessory 10 provides hands-free operation and use of
the Bluetooth-enabled cell phone and carries audio signals
betWeen the cell phone and the headphones, even in environ
40
ments that Were previously considered too noisy to carry on a
telephone conversation.
Circuitry in the control module includes automatic audio
source sWitching 30 (FIG. 7) that enables the user to recog
niZe and accept a cell phone cell Without taking off the head
45
phones. When the microphone is in use, during a phone call,
for example, a side tone is provided that alloWs the user to
hear himself talk in a natural voice even in high ambient noise
environments Which yields a more natural speaking experi
ence While Wearing the headphones.
50
The accessory is poWered by the headphone’s battery (not
shoWn) through one or more poWer conductors 47 that are, for
example, part of cable 16, thereby eliminating the need to
carry anotherbattery charger for the accessory. The accessory
10 is normally poWered on Whenever the headphones are
turned on, provided the accessory is plugged into the head
phones. A Bluetooth on/ off sWitch 32 on the control module
controls the poWer supplied to the Bluetooth module. The
Bluetooth module can be turned off during an airline ?ight,
for example, While still alloWing stereo music to be routed
from the music source through the control module to the
headphones. The accessory can be stored in the headphones
carrying case While attached to the headphones. The micro
phone 14, Which in some examples is a boom microphone,
can be stored in a boom holder in the headphones carrying
case.
lead-in.
A gooseneck 50 betWeen the boom 38 and the boom con
nector alloWs the user to adjust the position and orientation of
55
maintains the position and orientation When the user inserts or
removes the detachable boom microphone from the earcup
module. The keyed microphone connector alloWs the user to
remove the boom microphone after the has adjusted the
microphone and later reattach the boom microphone With the
microphone having the same, or close to the same position
and orientation upon reattached.
The on/ off sWitch 32 that controls poWer to the Bluetooth
module in the control module is on the opposite side of the
module from the up and doWn volume controls 60, 61 shoWn
in FIG. 5. The volume controls and send/end control 64
perform different functions depending on the operating mode
of the module. The mode is indicated by an indicator light 66.
One operating mode is a pairing mode in Which the acces
sory is paired With a Bluetooth-enabled cell phone. The user
enters the pairing mode by pressing the send/end button on
the control module and the VOL+button simultaneously
While the control module is poWered on. When in the pairing
mode, the indicator light is constantly lighted. Once inpairing
mode, the user enters a predetermined code into his cell
phone. For example, the user enters 0000 as the pairing code.
60
65
Once the paring has occurred, the Bluetooth link 29
betWeen the control module and the call phone carries audio
and control signals back and forth betWeen the cell phone and
the control module. After the call phone has beenpaired to the
accessory, the control module enters a stand-by mode, indi
cated by a blink once every 3 seconds. In stand-by mode,
short-pressing the send/end button activates a voice dialing
mode in the cell phone, if it has such a feature, to alloW the
US 7,920,903 B2
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6
user to dial a number using voice commands through the
to produce a more naturally sounding side-tone. If a different
microphone. (Otherwise the user can dial using the cell phone
keypad, for example.) A short-press is a press that lasts, for
example, less that 2 seconds. A long-press is one that lasts
ule may increase or decrease the high frequency boost to
microphone is used With the headphones, the side-tone mod
compensate for the different microphone.
The side-tone can mimic the level, variability, frequency,
more than 2 seconds. Long-pressing the send/end button
causes the last number dialed to be redialed. If the cell phone
or other characteristic of the attenuation imposed by the head
set. Among other things, loW frequency response can be
adjusted to compensate for the bass boost that characterizes
has voice dialing capability and the user enters voice dialing
mode, the user can cancel voice dialing by a short-press on the
send/end button. The user can also end the last number redial
mode by a short-press on the send/ end button.
When the control module is in stand-by mode and an
been con?gured for music reproduction.
incoming call is received, the appearance of the incoming call
is reported by the cell phone to the control module, and the
control module enters a ringing mode. If, When the incoming
useful in circumstances other than during a phone call,
including having a normal live conversation With another
typical noise canceling microphones When they are located
close to the speaker’s mouth and for equalization that has
Providing a side-tone equalized as described can also be
call appears, the user is listening to a music player connected
person. The user may end a call by pressing the send/end
through the music player jack, the control module alerts the
button or by detaching the boom microphone from the earcup
module. The control module monitors the signal from the
boom microphone and When the signal drops beloW a prede
user of the incoming call and alloWs the user to ansWer the
incoming phone call. The control module can alert the user of
the incoming call by altering the music so that the call is
audible by, for example, automatically muting or pausing the
music player, by loWering the level of the music, or by playing
the music player in one ear While playing the call in the other
ear. The user may ansWer the incoming call by a short-press
on the send/ end control or by pressing the VOL+control. The
user may reject the incoming call by a long-press on the
send/end control or by pressing the VOL- control. When the
user rejects or ends a call, the audio program automatically is
unmuted or resumed by the control module.
When the user is talking on the phone, the control module
is in an active call mode indicated by a 2-second-on/5-sec
termined threshold, the control module assumes that the
20
boom microphone has been detached. The control module
may also detect (by microphone detection circuitry 70, FIG.
7, in the control module) the detachment of the boom micro
phone by monitoring a current draW (or a voltage change
across a bias resistor) that poWers the microphone. When the
25
control module detects boom microphone detachment, the
control module hangs up the call by sending a hang up indi
cation to the cell phone and places the Bluetooth module into
the standby mode. Conversely, When the microphone is
30
may automatically ansWer the call and alloW the user to start
attached and an incoming call is received, the control module
ond-off cycle by the indicator light. In the active call mode,
talking.
the suer can end the call by a short-press on the send/end
control or can transfer the call by a long-press on the send/end
In some embodiments, the user may simply detach the
microphone during a teleconference to just listen to the tele
conference. This “listen only” feature may also be imple
control. During a call, the user can increase or decrease the
volume by pressing the VOL+ or VOL- control, respectively.
During the call, the user’s voice is played back through the
headphones as a side-tone. When Wearing typical head
35
mented by a separate sWitch or control on the control module.
This feature may be useful When the user is in a noisy envi
ronment and needs only to listen to the teleconference.
Other implantations are also Within the scope of the claims.
For example, some embodiments include placing some or
40
all of the control module circuitry in the earcup module and
providing controls on the earcup module. boom microphone,
phones, especially noise canceling headphones, the transfer
function betWeen the user’s mouth and his ears is altered so
that the user can hear only a modi?ed version of his voice that
sounds un-natural to him. In some implementations described
here, the user’ s voice is layered back through the headphones
or on a remote control. Some embodiments include placing
as a side-tone so that the user hears his voice naturally as if the
the control module circuitry Within the earcup of the head
phones.
Were not Wearing the headphones. Before being played into
the headphones, the side-tone may be equalized or level
45
adjusted for both (by signal processing circuitry 39, FIG. 7, in
The circuitry used to implement the features described
above is straightforward. The Bluetooth module, for example,
the control module) to make the side-tone sound close to the
is a standard Bluetooth module that can be purchased by
user’s natural voice so that the user does not perceive an
various vendors such as, for example, Samsung Micro Elec
tronics Corporation. Although Bluetooth protocol is used as
unWanted difference compared to What the is accustomed to
hearing When not Wearing the headphones.
50
The equalization and level adjustments Will depend on both
the microphone and headphones. In generally, the equalizer
can have a responses that is the inverse of the complete
transfer function (in the frequency domain) from mouth to ear
(through the electronic system including the headset), multi
55
plied by the measured response (approximate across a large
number of users) from mouth to ear through the air.
For a speci?c microphone and headphones combination, a
variety of equalization and level settings may be tried With
different users and the setting preferred by a majority of the
60
1. A method comprising:
receiving from a microphone of an active noise reducing
headphone signals representative of a voice of a user
Wearing the headphone, Wherein the microphone is dis
posed on the headphone in a manner placing the micro
module Within the control module or as a default setting in an
level side-tone module may be implemented using a ?xed
gain and boosting of an upper portion of a human voice range
forth in Us. patent application Ser. No. 11/191,873, ?led Jul.
28, 2005, and Ser. No. 11/390,718, ?led Mar. 27, 2006, Which
are incorporated here by reference in their entireties.
What is claimed is:
different users may be selected. The preferred setting may be
implemented as a non-adjustable equalization/level side-tone
adjustable equalization/level side-tone module Within the
control module. For example, a non-adjustable equalization/
the Wireless protocol, other short-range Wireless protocols
may be used.
Additional information about electronic interfacing With a
head-mounted device, and headset audio accessories is set
65
phone in proximity to the mouth of the user;
signal processing With a control module of the active noise
reducing headphone the received signals to produce
derived signals representative of the voice;
US 7,920,903 B2
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7
signal processing With the control module the additional
signals to produce additional derived signals represen
tative of the another voice;
delivering the additional derived signals to the transducer
delivering the derived signals to a transducer in the head
phone to be played to the user; and
Wherein the signal processing comprises at least a partial
inverse of the transfer function of the user’s voice from
to be played to the user; and
the user’ s mouth to an ear of the user that results from the
Wherein the signal processing of the additional signals
representative the another voice is substantially identical
to the signal processing of the received signals represen
user Wearing the headphone such that the signal process
ing causes the derived signals to be more natural repro
ductions of the user’s voice as played to the ear of the
user by the transducer.
2. The method of claim 1 in Which the signal processing
10
includes equalization.
tative of the voice.
7. The method of claim 1, Wherein the microphone is
carried on a boom to position the microphone in proximity to
3. The method of claim 1 in Which the signal processing
the mouth of the user.
includes level setting.
8. The method of claim 7 in Which the microphone boom is
detachable from the headphone.
9. The method of claim 1, in Which the signal processing
4. The method of claim 1 in Which the signal processing is
based on con?guration information provided by the user.
5. The method of claim 1, Wherein the headphone com
prises an earcup module, and Wherein the earcup module is
positioned in one of a set of possible positions relative to the
comprises boosting an upper portion of a human voice range
ear of the user, the set consisting of surrounding the ear, on the
comprises adjusting loW frequency response to compensate
ear and in the ear.
6. The method of claim 1, further comprising:
receiving from the microphone additional signals repre
senting another voice of a person other than the user;
of frequencies.
10. The method of claim 1, in Which the signal processing
20
for bass boost Where the microphone is a noise canceling
microphone.
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