JPS5888996A - Bone conduction microphone - Google Patents
Bone conduction microphoneInfo
- Publication number
- JPS5888996A JPS5888996A JP18754081A JP18754081A JPS5888996A JP S5888996 A JPS5888996 A JP S5888996A JP 18754081 A JP18754081 A JP 18754081A JP 18754081 A JP18754081 A JP 18754081A JP S5888996 A JPS5888996 A JP S5888996A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- pickup element
- sound pressure
- paths
- vibration pickup
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/46—Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、一方の耳から送話音声を送出すると共に受話
音声や信号音を聴取することもできるようにした骨導マ
イクロホンに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bone conduction microphone that is capable of transmitting a transmitted voice from one ear and also allowing receiving voices and signal tones to be heard.
従来、骨導音声信号をピックアップする振動ピックアッ
プ素子を片持式に支持した骨導マイクロホンで受話音聴
取を兼用する場合、たとえば実開２ ／・−
昭５５−１２７４８９号公報に記載されているように耳
栓の外周部に受話音圧導入用の音導通路を設けるか、若
しくはたとえば実開昭５５−１４２０９１号公報に記載
されているように耳栓の基部に音導孔を形成し、耳栓の
外周面に沿って受話音を導く方式が採用されている。し
かしながら前者の方式にあっては、音導通路と振動ピッ
クアップ素子が共に一本であるので、音導通路からの受
話音圧により振動ピックアップ素子が振動を受け、骨導
マイクロホンに発生する不要な受話出力を充分抑圧でき
ない欠点があった。一方、後者の方式にあっては、音導
孔を放射状に設けているので、振動ピックアップ素子に
対する音圧を低下させることはできるが、耳栓の外耳道
に対する装着状態によって音導通路が閉塞されるおそれ
があり、受話音を確実に聴取できない欠点があった。Conventionally, when a bone conduction microphone in which a vibration pickup element for picking up a bone conduction sound signal is supported in a cantilevered manner is also used for listening to a received voice, for example, as described in Japanese Utility Model Application No. 2/-1989-127489. A sound conduction path for introducing the receiving sound pressure is provided on the outer periphery of the earplug, or a sound conduction hole is formed at the base of the earplug as described in Japanese Utility Model Application Publication No. 55-142091. A method is adopted in which the received sound is guided along the outer circumferential surface of the stopper. However, in the former method, since the sound conduction path and the vibration pickup element are both one piece, the vibration pickup element is vibrated by the receiving sound pressure from the sound conduction path, and unnecessary reception occurs in the bone conduction microphone. There was a drawback that the output could not be suppressed sufficiently. On the other hand, in the latter method, since the sound guide holes are provided radially, it is possible to reduce the sound pressure against the vibration pickup element, but the sound guide path is blocked depending on how the earplug is attached to the ear canal. This has the drawback that the incoming call cannot be heard reliably.
本発明の目的は、受話音からの振動ピックアップ素子に
対する漏洩圧力’ｅｆｆｌ力低下させ、また音導通路の
閉塞を防止し、快適な同時送受話を行うことができるよ
うにした骨導マイクロホンを提供３−７
するにある。An object of the present invention is to provide a bone conduction microphone that reduces the leakage pressure 'effl' from received voice to a vibration pickup element, prevents blockage of the sound conduction path, and enables comfortable simultaneous transmission and reception. 3-7.
本発明は、上記目的を達成するため、放音口及び外耳道
挿入部を有する耳栓の内部に耳栓軸と略平行に保持され
、骨導音声信号をピックアップする振動ピックアップ素
子を設け、この振動ピックアップ素子に漏洩する受話音
圧を平衡させるように構成したことを特徴とするもので
ある。In order to achieve the above object, the present invention provides a vibration pickup element that is held approximately parallel to the earplug axis and picks up bone conduction sound signals inside an earplug that has a sound emitting port and an ear canal insertion portion, and The device is characterized in that it is configured to balance the receiving sound pressure leaking to the pickup element.
以下、本発明についてその実施例と共に説明する。第１
図及び第２図に示すように耳栓１は筒状の外耳道挿入部
２の前端に放音口３が形成され、外耳道挿入部２の後側
部に鍔状部４が形成され、鍔状部４の後側部に蓋５が設
けられている。耳栓１内における後側寄シ位置に保持部
材６が固定され、この保持部材６に振動ピックアップ素
子７が保持される。振動ピックアップ素子７はたとえば
セラミック圧電素子８の両面に出力端子９，１０を有し
、先端に感度特性や周波数特性を調整する重錘１１が取
付けられたものである。この振動ピックアップ素子７は
耳栓軸に沿ってその基部１２が保持部材６の中央部に片
持式に保持され、耳栓その出力端子９，１ｏが増幅器１
３に接続され、素子７の出力は増幅器１３で増幅されて
出力コード１４により外部に導出され、若しくは直接、
出力コード１４によシ外部に導出されて送信される。Hereinafter, the present invention will be explained along with examples thereof. 1st
As shown in the figure and FIG. 2, the earplug 1 has a sound emitting port 3 formed at the front end of a cylindrical external auditory canal insertion part 2, a flange-shaped part 4 formed at the rear side of the external auditory canal insertion part 2, and a flange-shaped part 4. A lid 5 is provided on the rear side of the section 4. A holding member 6 is fixed at a rearward position inside the earplug 1, and a vibration pickup element 7 is held by this holding member 6. The vibration pickup element 7 has output terminals 9 and 10 on both sides of a ceramic piezoelectric element 8, for example, and a weight 11 for adjusting sensitivity characteristics and frequency characteristics is attached to the tip. The vibration pickup element 7 is held in a cantilever manner with its base 12 at the center of the holding member 6 along the earplug axis, and the output terminals 9 and 1o of the earplug are connected to the amplifier 1.
3, and the output of the element 7 is amplified by the amplifier 13 and led out to the outside by the output cord 14, or directly,
It is derived and transmitted to the outside by the output code 14.
耳栓１の蓋６には耳栓軸に沿って音導パイプ１６の一端
が挿通状態で固定され、音導パイプ１５の他端は受話器
（例えばイヤホーン）１６と音響的に連絡され、音導パ
イプ１５内に受話音声や信号音を導くための音導通路１
７が形成されている。One end of a sound guide pipe 16 is inserted and fixed into the lid 6 of the earplug 1 along the axis of the ear plug, and the other end of the sound guide pipe 15 is acoustically connected to a receiver (for example, an earphone) 16 to conduct sound guide. Sound conduction path 1 for guiding received voice and signal sound into pipe 15
7 is formed.
音導パイプ１５の内端には耳栓１の内面との間に仕切壁
１８が取付けられ、仕切壁１８には音導通路１７と連通
する縦長の音導通路１９が形成されている。保持部材６
には耳栓軸に沿って音導通路１９と結合する一対の分岐
音導通路２０．２１が振動ピックアップ素子７の両側に
対称的に形成さｎている。前記出力コード１４は図示例
のように音導パイプ１５の内側に音導通路１７を閉塞し
ないように配設して通信機に近い位置で外部に引出すよ
うにしてもよく、また音導パイプ１６と一体５、、−。A partition wall 18 is attached between the inner end of the sound guide pipe 15 and the inner surface of the earplug 1, and a vertically elongated sound guide path 19 communicating with the sound guide path 17 is formed in the partition wall 18. Holding member 6
A pair of branch sound guide paths 20 and 21 are formed symmetrically on both sides of the vibration pickup element 7 along the earplug axis and coupled to the sound guide path 19. As shown in the illustrated example, the output cord 14 may be disposed inside the sound guide pipe 15 so as not to block the sound guide path 17 and be drawn out to the outside at a position close to the communication device. And what the heck 5,,-.
化して形成してもよい。出力コード１４の出力端子２２
と受話器１６に接続された入力コード２３の入力端子２
４は主通信装置、例えば無線送受信機、有線電話機やそ
の他の音声通信装置の受信部と送信部に接続さｎる。It may also be formed by Output terminal 22 of output cord 14
and the input terminal 2 of the input cord 23 connected to the receiver 16
4 is connected to a receiving section and a transmitting section of a main communication device, such as a wireless transceiver, a wired telephone, or other voice communication device.
耳栓１には分岐音導通路２０．２１ ｉ開閉し、分岐音
導通路２０．２１における音圧を調整する装置が設けら
れている。その詳細は第１図及び第３図から明らかなよ
うに保持部材６と仕切壁１８との間に扇形の調整板２５
が介挿され、この調整板２６の基部に固定された軸２６
が仕切壁１８と蓋６に回転可能に支持されている。調整
板２６には分岐音導通路２ｏと２１に連通し得る一対の
孔２７と２８が形成され、これらの孔２７．２８は一方
の孔２７若しくは２８が一方の分岐音導通路２ｏ若しく
は２１の全開状態では、他方の音導通路２１若しくは２
０を閉塞させることができ、また両孔２７．２８を両分
岐音導通路２０．２１に半開状態で同時に連通ずること
ができるように設定されている。即ち両分岐音導通路２
０．２１の６ベーン
大きさを無段階で調整できるようになっている。The earplug 1 is provided with a device that opens and closes the branched sound guide path 20.21i and adjusts the sound pressure in the branched sound guide path 20.21. As is clear from FIGS. 1 and 3, the details include a fan-shaped adjusting plate 25 between the holding member 6 and the partition wall 18.
is inserted into the shaft 26 fixed to the base of the adjustment plate 26.
is rotatably supported by the partition wall 18 and the lid 6. A pair of holes 27 and 28 are formed in the adjustment plate 26 and can communicate with the branch sound guide paths 2o and 21. In the fully open state, the other sound conduction path 21 or 2
0 can be closed, and both holes 27 and 28 can be simultaneously communicated with both branch sound guide paths 20 and 21 in a half-open state. That is, both branch sound guide paths 2
The size of the six 0.21 vanes can be adjusted steplessly.
しかし、これは一方が全開したあとで他方を閉じるよう
にしてもよい。保持部材６には一対のストッパー２９，
３ｏが突設され、これらストッパー２９．３０は一方の
孔２７若しくは２８が分岐音導通路２ｏ若し、くは２１
に全開状態で連通ずる位置に調整板２６を規制するよう
に設定されている。However, one may be fully opened and then the other may be closed. The holding member 6 has a pair of stoppers 29,
3o is provided protrudingly, and these stoppers 29 and 30 have one hole 27 or 28 connected to the branch sound guide path 2o or 21.
The adjustment plate 26 is set to a position where it is in communication in a fully open state.
次に本実施例の動作について説明する。この骨動マイク
ロホンは振動ピックアップ素子７の最大感度方向（第２
図の矢印入方向）に振動が加わるように耳栓１の外耳道
挿入部２を外耳道に挿入する。而して発声に伴う骨伝導
音声信号が耳栓１及び保持部材６を介して振動ピックア
ップ素子７に伝達される。この振動を出力電流に変換し
、これを増幅器１３で増幅し、若しくは直接、出力コー
ド１４により送信することができる。一方、受話器１６
からの音声または信号による音圧は音導通路１７．１９
及び分岐音導通路２０．２１’（５通り、耳栓１の放音
口３より耳孔内の音圧を変化させ、聴取される。このと
き分岐音導通路２０．ン１は７・−ノ
前記のように振動ピックアップ素子７の両側に対称的に
設けられているので、各分岐音導通路２゜、２１からの
振動ピックアップ素子子に対する音圧による不要出力は
等しく、相殺することができる。従って骨伝導音声信号
を受話音圧若しくは信号による音圧に影響さｎることな
く、確実に送信することができる。なお前記分岐音導通
路２０゜２１０位置としては本実施例位置以外にも種々
溝えられ、この実施例に限定さｎるものではない。Next, the operation of this embodiment will be explained. This bone motion microphone is used in the maximum sensitivity direction (second direction) of the vibration pickup element 7.
Insert the ear canal insertion part 2 of the earplug 1 into the ear canal so that vibration is applied in the direction indicated by the arrow in the figure. Bone conduction audio signals accompanying vocalization are transmitted to the vibration pickup element 7 via the earplug 1 and the holding member 6. This vibration can be converted into an output current which can be amplified by an amplifier 13 or transmitted directly by an output cord 14. On the other hand, the receiver 16
Sound pressure due to sound or signals from the sound conduction path 17.19
and the branched sound guide path 20.21' (5 ways to listen by changing the sound pressure in the ear canal through the sound emitting port 3 of the earplug 1. At this time, the branched sound guide path 20.21' is heard in 5 ways. As described above, since they are provided symmetrically on both sides of the vibration pickup element 7, unnecessary outputs due to sound pressure from each branched sound guide path 2° and 21 to the vibration pickup element are equal and can be canceled out. Therefore, the bone conduction audio signal can be reliably transmitted without being affected by the receiving sound pressure or the sound pressure caused by the signal.The position of the branched sound guide path 20°210 may be various in addition to the position of this embodiment. However, the present invention is not limited to this embodiment.
また本実施例にあっては、調整板２６により両分岐音導
通路２０．２１の大きさ、即ち音圧を調整することによ
り振動ピックアップ素子７９分岐音導通路２０．２１の
関係位置や取付方向等の精度を軽減しても両振動ピック
アップ素子７に現われる不要出力を平衡させて送信する
ことができる。In addition, in this embodiment, by adjusting the size, that is, the sound pressure, of both branch sound guide paths 20.21 using the adjustment plate 26, the relative position and mounting direction of the vibration pickup element 79 and the branch sound guide paths 20.21 can be adjusted. Even if the accuracy is reduced, unnecessary outputs appearing in both vibration pickup elements 7 can be balanced and transmitted.
第４図は本発明の他の実施例を示すものである。FIG. 4 shows another embodiment of the invention.
本実施例にあっては、分岐音導通路２０．２１を合成樹
脂製パイプ３１．３２により形成し、これらパイプ３１
．３２の間に回転子３３を偏心させて軸３４上に取付け
、回転子３３を回転させることにより合成樹脂製パイプ
３１．３２をその弾性を利用して押圧し、両分岐音導通
路２０．２１の振動ピックアップ素子７に対する音圧を
平衡させるように調整するようにしたものであり、その
他の構成は前記実施例と同様である。In this embodiment, the branched sound conducting paths 20.21 are formed by synthetic resin pipes 31.32, and these pipes 31.
．． 32, the rotor 33 is mounted eccentrically on the shaft 34, and by rotating the rotor 33, the synthetic resin pipe 31.32 is pressed using its elasticity, and both branch sound guide paths 20.21 The sound pressure applied to the vibration pickup element 7 is adjusted to be balanced, and the other configurations are the same as those of the previous embodiment.
第５図は本発明の更に他の実施例を示すものである。本
実施例にあっては、音導通路１７と分岐音導通路２０．
２１との分岐部にコック３５を軸３６により支持し、こ
のコック３５の回転により両分岐音導通路２０．２１の
振動ピックアップ素子子に対する音圧を平衡させるよう
に調整するようにしたものであり、その他の構成は前記
実施例と同様である。FIG. 5 shows still another embodiment of the present invention. In this embodiment, the sound guide path 17 and the branch sound guide path 20.
A cock 35 is supported by a shaft 36 at the branching point with the branch 21, and the rotation of the cock 35 adjusts the sound pressure against the vibration pickup element of both the branch sound guide paths 20 and 21 to be balanced. , the other configurations are the same as those in the previous embodiment.
第６図は本発明の更に他の実施例を示すものである。本
実施例にあっては、扁形の調整板３７の基部を軸３８上
に取付け、調整板３７の回転により両分岐音導通路２０
．２１の振動ピックアップ素子７に対する音圧を平衡さ
せるように調整するようにしたもので、前記実施例の如
き孔２６．２７を不要として構造を゛簡単にしたもので
あって、そ９／・−ノ
の他の構成は前記実施例と同様である。FIG. 6 shows still another embodiment of the present invention. In this embodiment, the base of the flat adjusting plate 37 is mounted on the shaft 38, and by rotating the adjusting plate 37, the two branch sound conducting paths 20
．． The sound pressure on the vibration pickup element 7 of 21 is adjusted to be balanced, and the structure is simplified by eliminating the need for the holes 26 and 27 as in the previous embodiment. The other configurations are the same as those of the previous embodiment.
なお、分岐音導通路２０．２１は耳栓１の放音口３附近
迄延長させｎは、振動ピックアップ素子７に対する影響
を更に小さくすることができる。Note that by extending the branched sound conducting paths 20, 21 to the vicinity of the sound emitting port 3 of the earplug 1, the influence on the vibration pickup element 7 can be further reduced.
また振動ピックアップ７に作用する不要出力は通話帯域
外の振動ピックアップ素子７の出力を低下させる低域フ
ィルターまたは高域フィルターのいずれか一方、または
両方を用いて除去するようにしてもよい。Further, unnecessary output acting on the vibration pickup 7 may be removed using either a low-pass filter or a high-pass filter that reduces the output of the vibration pickup element 7 outside the communication band, or both.
以上の説明より明らかなように本発明によれば、受話器
に音響的に連絡された音導通路より分岐する分岐音導通
路を振動ピックアップ素子の両側に対称的に設けている
。従って振動ピックアップ素子に漏洩する受話音圧を平
衡させることができ、また外耳道による受話通路の閉塞
を防止することができ、快適な同時送受話を行うことが
できる等の利点がある。As is clear from the above description, according to the present invention, branch sound guide paths branching from the sound guide path acoustically connected to the receiver are provided symmetrically on both sides of the vibration pickup element. Therefore, it is possible to balance the reception sound pressure leaking to the vibration pickup element, prevent the reception passageway from being blocked by the ear canal, and have the advantage that it is possible to comfortably transmit and receive calls at the same time.
第１図は本発明の一実施例による骨導マイクロホンの縦
断面図、第２図は第１図の■−■矢視図、１ｏ、−５−
ノ
第３図は第１図の■−■矢視断面図、第４図は本発明の
他の実施例の要部縦断面図、第５図は本発明の更に他の
実施例の要部縦断面図、第６図は本発明の更に他の実施
例の断面図である。
１・・・・・・耳栓、７・・・・・・振動ピックアップ
素子、１３・・・・・・増幅器、１４・り）・・・出力
コード、１６・・・・・・受話器、１７．１９・・・・
・・音導通路、２゜、２１・・・・・・分岐音導通路、
２５・・・・・・調整板、２９ 、３０−−−−・・ス
トッパー、３３・−・・・・回転丞３６・・・・・・コ
ック、３−７・・・・・・調整板。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
π
第２図
第４図
５５１１
〃
１
第６ＷＪFIG. 1 is a longitudinal sectional view of a bone conduction microphone according to an embodiment of the present invention, and FIG. 2 is a view taken along the ■-■ arrows in FIG. 1, 1o, -5-
3 is a sectional view taken along the line ■-■ in FIG. 1, FIG. 4 is a vertical sectional view of a main part of another embodiment of the present invention, and FIG. 5 is a main part of still another embodiment of the present invention. The longitudinal cross-sectional view, FIG. 6, is a cross-sectional view of still another embodiment of the present invention. 1...Earplug, 7...Vibration pickup element, 13...Amplifier, 14)...Output cord, 16...Telephone receiver, 17 .19...
...Sound conduction path, 2°, 21... Branch sound conduction path,
25...Adjustment plate, 29, 30---Stopper, 33...Rotary station 36...Cook, 3-7...Adjustment plate . Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure π Figure 2 Figure 4 5511 〃 1 6th WJ
Claims (1)
部に耳栓軸と略平行に保持され、骨導音声信号をピック
アップする振動ピックアップ素子と、この振動ピックア
ップ素子の出力を送信する送信手段と、受話器に音響的
に連絡され、受話音声若しくは信号を導く音導通路と、
この音導通路に接続され、前記振動ピックアップ素子の
両側に対称的に設けられた分岐音導用通路とを設けたこ
とを特徴とする骨導マイクロホン。An earplug having a sound emitting port and an ear canal insertion part, a vibration pickup element held approximately parallel to the earplug axis inside the earplug and picking up a bone conduction sound signal, and transmitting the output of the vibration pickup element. a transmitting means; a sound conduit in acoustic communication with the handset and guiding the received voice or signal;
A bone conduction microphone characterized in that a branch sound guide path is connected to the sound guide path and provided symmetrically on both sides of the vibration pickup element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18754081A JPS5888996A (en) | 1981-11-20 | 1981-11-20 | Bone conduction microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18754081A JPS5888996A (en) | 1981-11-20 | 1981-11-20 | Bone conduction microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5888996A true JPS5888996A (en) | 1983-05-27 |
Family
ID=16207870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18754081A Pending JPS5888996A (en) | 1981-11-20 | 1981-11-20 | Bone conduction microphone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5888996A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5109410A (en) * | 1990-01-05 | 1992-04-28 | Technology Management And Ventures, Ltd. | Two-line, hands-free telephone system |
| US5164984A (en) * | 1990-01-05 | 1992-11-17 | Technology Management And Ventures, Ltd. | Hands-free telephone assembly |
| US5345509A (en) * | 1992-08-04 | 1994-09-06 | Stanton Magnetics, Inc. | Transducer with ear canal pickup |
| WO2011158506A1 (en) | 2010-06-18 | 2011-12-22 | パナソニック株式会社 | Hearing aid, signal processing method and program |
| US9779716B2 (en) | 2015-12-30 | 2017-10-03 | Knowles Electronics, Llc | Occlusion reduction and active noise reduction based on seal quality |
| US9812149B2 (en) | 2016-01-28 | 2017-11-07 | Knowles Electronics, Llc | Methods and systems for providing consistency in noise reduction during speech and non-speech periods |
| US9830930B2 (en) | 2015-12-30 | 2017-11-28 | Knowles Electronics, Llc | Voice-enhanced awareness mode |
| US9961443B2 (en) | 2015-09-14 | 2018-05-01 | Knowles Electronics, Llc | Microphone signal fusion |
-
1981
- 1981-11-20 JP JP18754081A patent/JPS5888996A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5109410A (en) * | 1990-01-05 | 1992-04-28 | Technology Management And Ventures, Ltd. | Two-line, hands-free telephone system |
| US5164984A (en) * | 1990-01-05 | 1992-11-17 | Technology Management And Ventures, Ltd. | Hands-free telephone assembly |
| US5345509A (en) * | 1992-08-04 | 1994-09-06 | Stanton Magnetics, Inc. | Transducer with ear canal pickup |
| WO2011158506A1 (en) | 2010-06-18 | 2011-12-22 | パナソニック株式会社 | Hearing aid, signal processing method and program |
| US9124984B2 (en) | 2010-06-18 | 2015-09-01 | Panasonic Intellectual Property Management Co., Ltd. | Hearing aid, signal processing method, and program |
| US9961443B2 (en) | 2015-09-14 | 2018-05-01 | Knowles Electronics, Llc | Microphone signal fusion |
| US9779716B2 (en) | 2015-12-30 | 2017-10-03 | Knowles Electronics, Llc | Occlusion reduction and active noise reduction based on seal quality |
| US9830930B2 (en) | 2015-12-30 | 2017-11-28 | Knowles Electronics, Llc | Voice-enhanced awareness mode |
| US9812149B2 (en) | 2016-01-28 | 2017-11-07 | Knowles Electronics, Llc | Methods and systems for providing consistency in noise reduction during speech and non-speech periods |
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