參數(shù)資料
型號: TAS3103IDBTRG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PDSO38
封裝: GREEN, PLASTIC, TSSOP-38
文件頁數(shù): 147/148頁
文件大?。?/td> 1247K
代理商: TAS3103IDBTRG4
339
The transfer curve remains a constant 24 dB above the 1:1 transfer curve for input levels above and below T2 until
the computed DRC gain coefficient falls within the dynamic range of a 5.23 format number. For input levels above
T2, k2 implements a 5:1 compression, At an input level 7.5 dB above T2 (62.5 dB), the DRC transfer curve has risen
7.5/5 = 1.5 dB. The boost at this point is 30 dB - (7.5 dB - 1.5 dB) = 24 dB. The DRC has come out of gain saturation.
For input levels above 62.5 dB, the transfer curve exhibits 5:1compression.
Table 35. DRC Example 2 Parameters
DRC
PARAMETER
REQUIRED (SPECIFIED) VALUE
(NET GAINSAP Input-DRC = 0 dB)
I2C COEFFICIENT VALUE
T2
22 dBInput 70 dBDRC
70/6.0206= 11.626748
= 0x000005D0394825.23 Format
T1
102 dBInput 150 dBDRC
150/6.0206 = 24.91446
= 0x00000C750D0925.23 Format
O2
30 dB
(30 + 24.0824)/6.0206 = 0.982892
= 0xFFFFFF82309825.23 Format
O1
50 dB
(50 + 24.0824)/6.0206 = 12.304820
= 0x00000627045825.23 Format
k2
5:1 Compression
(1/5) 1 = 0.8 = 0xF99999A5.23 Format
k1
1:2 Expansion
2 1 = 1 = 0x08000005.23 Format
k0
2:1 Compression
(1/2) 1 = 0.5 = 0xFC000005.23 Format
For input levels below T2, k1 implements a 1:2 expansion. With a 1:2 expansion in effect, the transfer curve has
dropped 12 dB at an input level 6 dB below T2. The boost at this level is 30 dB (12 dB 6 dB) = 24 dB. The DRC
gain coefficient has again come out of saturation. For input levels below 76 dB and above 150 dB, the transfer curve
exhibits a 1:2 expansion.
At T1 (-150 dB), the transfer curve is 50 dB below the 1:1 transfer curve. Since O1 = 50 dB, there is no discontinuity
in the transfer function. For inputs below 150 dB, k0 implements a 2:1 compression. The change from a 2:1
compression to a 1:1 transfer at 192 dB is due to 32-bit dynamic range saturation at the DRC input.
3.7.3.3 Example 3—1:1 Transfer/Infinite Compression With Minimum Gain Saturation, 32-Bit
Dynamic Range Saturation, and Equal Threshold Settings (T1=T2)
The DRC transfer function parameters for this example are given in Table 36. In addition to illustrating minimum gain
saturation, this example also illustrates the operation of the DRC when T1 and T2 are set equal.
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