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| 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(biāo)化作-商標(biāo)- DSP系統(tǒng)啟用 |
| 文件頁數(shù)： | 11/21頁 |
| 文件大?。?/td> | 291K |
| 代理商： | GA3222 |
GA3222 Preliminary Data Sheet
34477 - 0
February 2006
11 of 21
7.3.3 Time Constants
The preconfigured attack and release times are 200ms and 20ms respectively for
two main reasons:
1. To ensure that the noise reduction system is not activated during softer
phonemes in speech (slower expansion attack time) and that the system
quickly responds to the onset of speech (faster expansion release time). The
typical duration of phonemic gaps between syllables in speech is about
150ms, so the expansion attack time should be longer than this to avoid
distorting the speech envelope.
2. Slow time constants are in keeping with ADRO processing and are optimized
to preserve the sound quality of speech.
7.4 Adaptive Feedback Canceller
Advanta’s feedback canceller reduces acoustic feedback by forming an estimate
of the hearing aid feedback signal and then subtracting this estimate from the
hearing aid input. Therefore, the forward path of the hearing aid is not affected.
Unlike adaptive notch filter approaches, Advanta’s feedback canceller does not
reduce the hearing aid’s gain.
Figure 7-1: Adaptive Feedback Canceller block diagram
G
Σ
H'
H
+
-
Feedback path
Estimated feedback
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