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RT9107B Datasheet(PDF) 21 Page - Richtek Technology Corporation |
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RT9107B Datasheet(HTML) 21 Page - Richtek Technology Corporation |
21 / 42 page 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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