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参数资料
型号： TAS3103DBT
厂商： TEXAS INSTRUMENTS INC
元件分类： 消费家电
英文描述： SPECIALTY CONSUMER CIRCUIT, PDSO38
封装： GREEN, PLASTIC, TSSOP-38
文件页数： 3/148页
文件大小： 1247K
代理商： TAS3103DBT
341
When T1 and T2 are set equal, the following questions arise:
If O1
≠ O2, what roles do O1 and O2 have?
Which slope parameter, k0 or k1, has control of the transfer function for input levels below the common
threshold point?
Does k2 control the transfer function for inputs above the common threshold point?
This example addresses and answers those questions.
Table 36. DRC Example 3 Parameters
DRC
PARAMETER
REQUIRED (SPECIFIED) VALUE
(NET GAINSAP Input-DRC = 0 dB)
I2C COEFFICIENT VALUE
T1 and T2
148.7 dBInput ≥ 172.7 dBDRC
172.7/6.0206 = 28.684849
= 0x00000E57A91F25.23 Format
O2
20 dB
(20 + 24.0824)/6.0206 = 0.678072
= 0x00000056CB0F25.23 Format
O1
10 dB
(10 + 24.0824)/6.0206 = 5.660964
= 0x000002D49A7825.23 Format
k2
∞:1 Compression
(1/
∞) 1 = 1 = 0xF8000005.23 Format
k1
1:1 Transfer
(1/1) 1 = 0 = 0x00000005.23 Format
k0
2:1 Compression
(1/2) 1 = 0.5 = 0xFC000005.23 Format
For this example it is assumed that a net processing gain of 24 (24 dB) is realized from the SAP input and the DRC
(which is identical to the net processing gain assumed for Example 1). The 24 gain results in reducing the 8-bit
headroom in the 48-bit DAP word to a headroom of four bits. The 32-bit data into the DRC then resides in bits 27:0,
which means that the data level into the DRC is down 24 dB with respect to the input level at the SAP. Data input into
the TAS3103 (SAP) at a level of 148.7 dB is seen as a 148.7 dB 24 dB = 172.7-dB signal at the DRC. T1 and
T2 must be set to 172.7 dB to realize a common threshold point at an incoming signal level of 148.7 dB.
Figure 325 shows the transfer function resulting from entering the I2C coefficient values given in Table 36. At the
T1/T2 threshold, a discontinuity of 30 dB is observed. For inputs above the threshold, the transfer curve is horizontal
(infinite compression), and the horizontal line starts 20 dB above the 1:1 transfer curve at the threshold point. Thus,
for cases when T1 = T2, O2 governs the offset with regard to the starting point of the transfer curve above the common
threshold point and k2 determines the slope of the transfer curve. For inputs below the common threshold point, the
transfer curve exhibits a 2:1 compression and starts 10 dB below the 1:1 transfer curve. Thus, O1 sets the offset at
the threshold point for the transfer curve at and below the common threshold point and k0 determines the slope of
this curve. Slope parameter k1 plays no role when T1 = T2. The value of 0 (1:1 transfer) used in this example for k1
could be changed to any value and the resulting transfer function would not be altered. 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.
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