參數(shù)資料
型號(hào)： GA3217
廠(chǎng)商： Gennum Corporation
英文描述： Venture-TM Digital DSP System
中文描述： 創(chuàng)業(yè)- TM數(shù)字DSP系統(tǒng)
文件頁(yè)數(shù)： 11/24頁(yè)
文件大小： 261K
代理商： GA3217
GA3219 / GA3218 / GA3217 Preliminary Data Sheet
Proprietary and Confidential
32718 - 2
February 2005
11 of 24
7. Functional Block Description
7.1 Adaptive Feeback Canceller
The Adaptive Feedback canceller (AFC) 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 is not affected.
Unlike adaptive notch filter approaches, Venture's AFC does not reduce the
hearing aid's gain. The AFC is based on a time-domain model of the feedback path.
Venture’s second generation AFC exhibits greatly improved resistance to tonal
inputs.
Figure 7-1: Adaptive Feedback Canceller (AFC) block diagram
7.2 Adaptive Noise Reduction
The noise reduction algorithm is built upon a high resolution 128-band filterbank
enabling precise removal of noise. The algorithm monitors the signal and noise
activities in these bands, and imposes a carefully calculated attenuation gain
independently in each of the 128 bands.
The noise reduction gain applied to a given band is determined by a combination
of three factors:
Signal-to-Noise Ratio (SNR)
Masking threshold
Dynamics of the SNR per band.
The SNR in each band determines the maximum amount of attenuation that will be
applied to the band; the poorer the SNR, the greater the amount of attenuation.
Simultaneously, in each band, the masking threshold variations resulting from the
energy in other adjacent bands is taken into account. Finally, the noise reduction
gain is also adjusted to take advantage of the natural masking of 'noisy' bands by
speech bands over time.
Based on this approach, only enough attenuation is applied to bring the energy in
each 'noisy' band to just below the masking threshold. This prevents excessive
amounts of attenuation from being applied and thereby reduces unwanted artifacts
G
Σ
H'
H
+
-
Feedback path
Estimated feedback
相關(guān)PDF資料
PDF描述
GA3218 Venture-TM Digital DSP System
GA3219 Venture-TM Digital DSP System
GA3220 Programmable Signal Processing Platform for Hearing Instruments
GA3222 Advanta-TM ADRO-TM - Enabled DSP System
GA3224 PARAGON-TM DIGITAL Two Channel DSP System
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
GA3218 制造商:GENNUM 制造商全稱(chēng):GENNUM 功能描述:Venture-TM Digital DSP System
GA3219 制造商:GENNUM 制造商全稱(chēng):GENNUM 功能描述:Venture-TM Digital DSP System
GA3220 制造商:GENNUM 制造商全稱(chēng):GENNUM 功能描述:Programmable Signal Processing Platform for Hearing Instruments
GA3222 制造商:GENNUM 制造商全稱(chēng):GENNUM 功能描述:Advanta-TM ADRO-TM - Enabled DSP System
GA3224 制造商:GENNUM 制造商全稱(chēng):GENNUM 功能描述:PARAGON-TM DIGITAL Two Channel DSP System
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