Subject: Noise cancellation microphone
From: EPOS Global Support <[email-masked]>
Cc: Marika Fujita <[email-masked]>
Date: Thu, 04 Mar 2021 09:35:23 +0000

##- Please type your reply above this line -##

You are registered as a CC on this support request (131940). Reply to this email to add a comment to the request.

----------------------------------------------

Vamsy Maddipati, Mar 4, 2021, 9:35 UTC (private)

Hi **Marika Fujita**​,

It depends on the microphone technology. If it is a dynamic microphone (mostly used in wired headsets) then yes noise cancelling is achieved via a two port mechanism. If it
is a electret microphone technology, then noise cancelling is generally achieved using beamforming techniques using a software mechanism. The beamforming technique
uses two or more microphones.

----------------------------------------------

Marika Fujita, Mar 3, 2021, 8:43 UTC (private)

Question from Kamata san

The reason of Bi-Directional is better than Uni-directional.
What makes it better?

----------------------------------------------

Marika Fujita, Mar 3, 2021, 8:24 UTC (private)

**_NEXT ACTION_**

**What**: I had call with Kamata san and forward the message from Matthew.
**Who**: Kamata
**When**: 08/03/2021

----------------------------------------------

Marika Fujita, Mar 3, 2021, 8:21 UTC

EPOS Japan
鎌田さん

お世話になります。EPOSグローバルサポートの藤田でございます。

下記、ご確認下さいませ。

**Bi-Directional:**
SH line, CC line
DW Office/Pro1/Pro2
SD Office/Pro1/Pro2
MB Pro1/Pro2
D10
Culture

**Uni-directional:**
Circle, Century

 ![](https://eposaudio.zendesk.com/attachments/token/YEtyzMyHTGmf8YLL0ey7zn7pc/?name=inline1044638022.png)​
 ![](https://eposaudio.zendesk.com/attachments/token/vFDXs5KDkVeKdEs0vufZ5cI68/?name=inline71032466.png)​

**Noise-cancelling**

A **noise-cancelling microphone** is a microphone designed to filter out ambient noise from the desired sound, especially useful in noisy environments such as call centres
There are two ports through which sound enters; a front port normally oriented toward the mouth and another port that's more distant.
The microphone's diaphragm is placed between the two ports; sound arriving from an ambient sound field reaches both ports more or less equally. The sound that's much closer to the front port than to the rear will make the diaphragm move more.
The microphone's proximity effect is adjusted so that a flat frequency response is achieved for sound sources very close to the front of the mic – typically 1 to 3 cm. Sounds arriving from other angles are subject to steep midrange and bass roll-off.
Wideband has more high-frequency content, and noise-cancelling is less effective

 ![](https://eposaudio.zendesk.com/attachments/token/SwIXZop6kQA4pFf3Tr3TauXcS/?name=inline2014369281.png)​

どうぞよろしくお願いいたします。

EPOSグローバルサポート
藤田

----------------------------------------------

Marika Fujita, Mar 1, 2021, 8:51 UTC

EPOS Japan
鎌田さん

お世話になります。EPOSグローバルサポートの藤田でございます。

下記、確認中でございます。分かり次第、再度ご連絡いたします。
どうぞよろしくお願いいたします。

EPOSグローバルサポート
藤田

----------------------------------------------

Matthew Broadley, Mar 1, 2021, 4:24 UTC (private)

This should help.

**Bi-Directional:**
SH line, CC line
DW Office/Pro1/Pro2
SD Office/Pro1/Pro2
MB Pro1/Pro2
D10
Culture

**Uni-directional:**
Circle, Century

 ![](https://eposaudio.zendesk.com/attachments/token/YEtyzMyHTGmf8YLL0ey7zn7pc/?name=inline1044638022.png)​
 ![](https://eposaudio.zendesk.com/attachments/token/vFDXs5KDkVeKdEs0vufZ5cI68/?name=inline71032466.png)​

**Noise-cancelling**

A **noise-cancelling microphone** is a microphone designed to filter out ambient noise from the desired sound, especially useful in noisy environments such as call centres
There are two ports through which sound enters; a front port normally oriented toward the mouth and another port that's more distant.
The microphone's diaphragm is placed between the two ports; sound arriving from an ambient sound field reaches both ports more or less equally. The sound that's much closer to the front port than to the rear will make the diaphragm move more.
The microphone's proximity effect is adjusted so that a flat frequency response is achieved for sound sources very close to the front of the mic – typically 1 to 3 cm. Sounds arriving from other angles are subject to steep midrange and bass roll-off.
Wideband has more high-frequency content, and noise-cancelling is less effective

 ![](https://eposaudio.zendesk.com/attachments/token/SwIXZop6kQA4pFf3Tr3TauXcS/?name=inline2014369281.png)​

----------------------------------------------

Marika Fujita, Mar 1, 2021, 3:58 UTC (private)

**_CASE SUMMARY_**

**Company Name**: EPOS Japan
**Contact person**: Kensuke Kamata (KKKA)
**Email**: [email-masked]
**Product name**: Noise cancellation microphone
**Number of Products**: 0
**Sales Opportunity Size in Headsets**: 0
**Issue**: Noise cancellation microphone
**Current status**:
- Kamata san is asking about noise cancellation microphone.

1. Are the specifications of the directional microphone installed in the EPOS headset correct?
  Noise canceling microphone → Unidirectional microphone
 Ultra noise canceling microphone → Bi-directional microphone

2. If yes, please let me know below:
 a. The reason for adopting the unidirectional microphone as a noise-canceling microphone
 b. The reason for adopting a bi-directional microphone as ultra noise canceling microphone
 c. Advantages and disadvantages of two microphones

----------------------------------------------

Kensuke Kamata (KKKA), Feb 26, 2021, 9:21 UTC

藤田さん

お疲れ様です。

EPOSのヘッドセット搭載されている指向性マイクの仕様は以下であったと認識しております。

・ノイズキャンセリングマイク　→　単一指向性マイク

・ウルトラノイズキャンセリングマイク　→双指向性マイク

この認識が正しい時２つのマイクにつきまして、以下の確認をお願い出来ますでしょうか。

1. ノイズキャンセリングマイクとして単一指向マイクをウルトラノイズキャンセリングマイクとして双指向マイクを採用した理由
2. ２つマイクについてのメリット、デメリット

よろしくお願いいたします。

**鎌田健輔**

セールスマネージャー　エンタープライズソリューションズ

M 090 4911 9507

![](https://eposaudio.zendesk.com/attachments/token/Z1fIxQvT8PvfrvtdQvJvcK6AJ/?name=image001.png)

EPOS Japan株式会社

〒212-0013神奈川県川崎市幸区堀川町580ソリッドスクエア西館16F

![](https://eposaudio.zendesk.com/attachments/token/dqyKHOOr5LKUFfUIDLSUoPQXD/?name=image003.jpg)

HPhttps://www.eposaudio.com/en/jp/enterprise

--------------------------------
This email is a service from EPOS Enterprise.

[MMWGML-57LY]