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参数资料
型号： TAS3103DBTG4
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： 145/148页
文件大小： 1247K
代理商： TAS3103DBTG4
337
O1
INPUT +
1
6.0206
[
*7.5 ) 24.0824] + 2.754277
+ 010.1100_0001_0001_1000_0100_110
+ 0x000001608C26 in 25.23 format
For input levels above the T2 threshold, the transfer function exhibits a 1:1.1 expansion. For input levels below T2,
the transfer function exhibits a 2:1 compression. Also, by definition, it is seen that there is no discontinuity in the
transfer function at T2. When the 2:1 compression curve in region 1 intersects the T1 threshold level, the output level
is 7.5 dB above the 1:1 transfer, an offset value identical to O1. Thus, there is no discontinuity at T1. For input levels
below T1, the transfer function exhibits a 1:1.05 expansion.
DRC rms input levels below 192 dB fall below the 32-bit precision of the DRC input (32 bits x 6 dB/bit = 192 dB).
This means that for levels below 192 dB, the DRC sees a constant input level of 0, and thus the computed DRC gain
coefficient remains fixed at the value computed when the input was at 192 dB. The transfer function then has a 1:1
slope below the –192-dB input level and is offset from the 1:1 transfer curve by the offset present at the –192-dB input
level.
The change from a 1:1.05 expansion to a 1:1 transfer below 192 dB is the result of 32-bit dynamic range saturation
at the DRC input. This type of saturation always occurs at a DRC input level of 192 dB. However, the input level at
which this type of saturation occurs depends on the channel gain. For this example, the saturation occurs at an input
level of 168 dB (192-dB DRC input + 48 dB 8-bit headroom –24-dB mixer gain into DRC).
3.7.3.2 Example 2—Compression/Expansion/Compression Transfer Function With Maximum Gain
Saturation and 32-Bit Dynamic Range Saturation
The transfer function parameters for this example are given in Table 35. In setting the threshold levels it is assumed
that the net processing gain between the SAP input and the DRC is 0 dB. This is the same as Example 1 except that
the gain of the mixer into the DRC is set to 1 instead of 24. Because of the 8-bit headroom in the 48-bit DAP word,
the upper eight bits of the 32-bit DRC input word are zero, resulting in 0-dB signal levels at the SAP input being seen
as –48-dB signal levels at the DRC.
Figure 323 shows the DRC transfer function resulting from the parameters given in Table 35. At threshold level
T2 (70 dB), O2 specifies a boost of 30 dB. But the signed 5.23 formatted gain coefficient only provides a 24-dB boost
capability (5 integer bits = Sxxxx
≥ 24 × 6 dB/octave = 24 dB). Internally, the DRC operates in 48-bit space and thus
computes a 30-dB boost. But the 5.23 formatted gain coefficient saturates or clips at 24 dB. The transfer curve thus
resides 24 dB above the 1:1 transfer curve at T2.
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