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WM8904ECS/R 数据表(PDF) 57 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 57 Page - Wolfson Microelectronics plc |
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57 / 188 page  Pre-Production WM8904 w PP, Rev 3.3, September 2012 57 QUICK RELEASE CONTROL The DRC includes a Quick-Release feature to handle short transient peaks that are not related to the intended source signal. For example, in handheld microphone recording, transient signal peaks sometimes occur due to user handling, key presses or accidental tapping against the microphone. The Quick Release feature ensures that these transients do not cause the intended signal to be masked by the longer time constants of DRC_DCY. The Quick-Release feature is enabled by setting the DRC_QR bit. When this bit is enabled, the DRC measures the crest factor (peak to RMS ratio) of the input signal. A high crest factor is indicative of a transient peak that may not be related to the intended source signal. If the crest factor exceeds the level set by DRC_QR_THR, then the normal decay rate (DRC_DCY) is ignored and a faster decay rate (DRC _QR_DCY) is used instead. The DRC Quick-Release control bits are described in Table 20. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R40 (28h) DRC Control 0 2 DRC_QR 1 Quick release enable 0 = disabled 1 = enabled R41 (29h) DRC Control 1 7:6 DRC_QR_THR [1:0] 01 Quick release crest factor threshold 00 = 12dB 01 = 18dB (default) 10 = 24dB 11 = 30dB 5:4 DRC_QR_DCY [1:0] 00 Quick release decay rate (seconds/6dB) 00 = 0.725ms (default) 01 = 1.45ms 10 = 5.8ms 11 = Reserved Table 20 DRC Quick-Release Control GAIN SMOOTHING The DRC includes a gain smoothing filter in order to prevent gain ripples. A programmable level of hysteresis is also used to control the DRC gain. This improves the handling of very low frequency input signals whose period is close to the DRC attack/decay time. DRC Gain Smoothing is enabled by default and it is recommended to use the default register settings. The extent of the gain smoothing filter may be adjusted or disabled using the control fields described in Table 21. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R40 (28h) DRC Control 0 12:11 DRC_GS_HYST _LVL [1:0] 00 Gain smoothing hysteresis threshold 00 = Low 01 = Medium (recommended) 10 = High 11 = Reserved 3 DRC_GS_ENA 1 Gain smoothing enable 0 = disabled 1 = enabled 0 DRC_GS_HYST 1 Gain smoothing hysteresis enable 0 = disabled 1 = enabled Table 21 DRC Gain Smoothing |
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