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RT9107B Datasheet(PDF) 21 Page - Richtek Technology Corporation

Part # RT9107B
Description  Dual-Channel Digital Audio System
Download  42 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9107B Datasheet(HTML) 21 Page - Richtek Technology Corporation

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RT9107B
21
DS9107B-00 November 2016
www.richtek.com
©
Copyright 2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Dynamic Range Control (DRC)
DRC is a specific feature to automatically adjust the volume gain corresponds to different input signal. With DRC
function, the output dynamic range is under controlled from input amplitude is unknown or varies over a wide range.
RT9107B provide three thresholds as dynamic range compression (DRCx_T), extension (DRCx_E_T) and Noise Gate
(DRCx_N_T). For the application of compression and extension, the slope ratio can be programmed as DRCx_K and
DRCx_E_K, respectively.
DRC function is composed of several parts as following Figure.
Then, the filtered signal is compared with the given compression threshold. After the comparison between Input signal
amplitude and threshold, the Attack Rate (DRCx_AA) determines how quickly the DRC gain decreases when the signal
amplitude is high. The Decay Rate (DRCx_AD) determines how quickly the DRC gain increases when the signal amplitude
is low.
Compressor rate
Compressor/limit
Expander
Noise gate
Dynamic
range
Input Level (dB)
window
s
-1
t
f ln(1-ae)
Energy
Filter
Compression
Filter
Attack/Decay
Filter
Gain
AE
1-AE
AA
1-AA
AD
1-AD
Audio Input
Audio Output
Alpha Filter Structure
Z
-1
-
Note :
= 1
The input signal passes through the programmable Energy Filter (DRCx_AE). The Filter structure is shown in following
Figure.
The time constant of each filter can be determined by below equation :


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