- 您現在的位置：買賣IC網 > PDF目錄384301 > GA3222 (Gennum Corporation) Advanta-TM ADRO-TM - Enabled DSP System PDF資料下載
參數資料
| 型號： | GA3222 |
| 廠商： | Gennum Corporation |
| 英文描述： | Advanta-TM ADRO-TM - Enabled DSP System |
| 中文描述： | 埃德瓦塔-商標化作-商標- DSP系統啟用 |
| 文件頁數： | 10/21頁 |
| 文件大小： | 291K |
| 代理商： | GA3222 |
GA3222 Preliminary Data Sheet
34477 - 0
February 2006
10 of 21
7.2 Adaptive Directional Microphone
Adaptive directional microphones offer flexibility over fixed directional microphones
as noise from any direction can be optimally rejected. The architecture of this
particular adaptive directional microphone combines the input from two
microphones to achieve the desired response. The inherently flat frequency
response of the adaptive directional microphone eliminates the need for a separate
frequency compensation algorithm.
An adjustable threshold criterion also allows the Adaptive Directional Microphone
to automatically adapt to an omni-directional response when the environment is
relatively quiet. In situations where a directional response is noisy (e.g. wind) an
omni-directional response is also automatically used. In the case of a diffuse sound
field, the adaptive directional microphone adapts to a super-cardioid polar pattern,
which is optimal for this situation.
7.2.1 Threshold Criterion
The recommended threshold for the adaptive directional microphone is
65-70dBSPL. This threshold ensures that in quiet environments an
omni-directional response is adopted, and that in a moderately noisy environment
the appropriate directional response is used.
7.3 Noise Reduction
The internal noise reduction system is a single-channel expansion scheme
operating to reduce the broad-band noise generated internally in the hearing aid –
particularly in the microphone.
The intensity of both the noise and signal after the front microphone pre-amp is
shaped with an approximately A-weighted filter designed to more accurately reflect
the sensitivity of the human ear. This weighting means that the INR threshold is at
a fairly constant sensation level across frequency, as opposed to a constant
intensity. The aggressiveness of the noise reduction algorithm is adjustable.
7.3.1 Expansion Threshold
Test box measures show that the speech intelligibility index of soft speech
(55dBSPL LTASS) is not compromised with an expansion threshold of 50 - 55
dBSPL.
The recommended expansion threshold setting for the fixed directional
microphone is 50 - 55 dBSPL .
7.3.2 Expansion Ratio
The recommended expansion ratio is 0.7 to minimize audible effect when the
hearing aid moves in and out of expansion. Ratios less than 0.6 are not
recommended.
相關PDF資料 |
PDF描述 |
|---|---|
| GA3224 | PARAGON-TM DIGITAL Two Channel DSP System |
| GA3225 | PARAGON⑩ DIGITAL Four Channel DSP System with FRONTWAVE |
| GA4F4M | KPT 61C 61#20 SKT PLUG |
| GA4A3Q | RESISTOR BUILT-IN TYPE NPN TRANSISTOR |
| GA4A4L | RESISTOR BUILT-IN TYPE NPN TRANSISTOR |
相關代理商/技術參數 |
參數描述 |
|---|---|
| GA3224 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:PARAGON-TM DIGITAL Two Channel DSP System |
| GA3225 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:PARAGON⑩ DIGITAL Four Channel DSP System with FRONTWAVE |
| GA3-250 | 制造商:Southco 功能描述: |
| GA3250- | 制造商:Coilcraft Inc 功能描述:Coupled inductor, for MAX 14521E, SMT, RoHS |
| GA3250-BL | 制造商:Coilcraft Inc 功能描述:Coupled inductor, for MAX 14521E, SMT, RoHS |
發(fā)布緊急采購，3分鐘左右您將得到回復。