TAS3103DBTR PDF资料下载(5/148 页)SPECIALTY CONSUMER CIRCUIT, PDSO38

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参数资料

型号：	TAS3103DBTR
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：	5/148页
文件大小：	1247K
代理商：	TAS3103DBTR

343

The horizontal slope of the transfer curve above the common threshold point does not remain horizontal indefinitely.

At a point 158 dB above the common threshold point (14.7-dB DRC input level), the transfer function has gone from

a boost of 20 dB to a cut of 138 dB. A cut of 138 dB is the maximum cut possible for a 5.23 format gain coefficient

(223

≥ 23 octaves × 6 dB/octave = 138 dB). Thus, at a DRC input level of 14.7 dB, minimum gain saturation has

been reached. For inputs above this saturation point, the DRC-derived gain coefficient remains constant at the

minimum gain value (223), and the transfer function exhibits a 1:1 transfer slope.

3.7.3.4 Example 4—Expansion/Cut/Expansion With Gain Saturation and 32-Bit Dynamic Range

Saturation

The three previous examples restricted the slope factor k to lie in the range k

≥ 1. This example illustrates the transfer

characteristic obtained using a value of k less than 1. For this example it is assumed that the net processing gain

into the DRC is 0 dB. This means that the 8-bit headroom in the 48-bit DAP processing word structure does not contain

data. Since the DRC receives the upper 32 bits of this 48-bit word, data at the DRC is down 48 dB (8 bits x 6 dB/ bit

= 48 dB) with respect to the signal level at the SAP input (TAS3103 input). The transfer function parameters for this

example are given in Table 37. Figure 326 shows the transfer function resulting from entering the I2C coefficient

values given in Table 37.

At the threshold point T2 (70 dB), the transfer function is 100 dB below the 1:1 transfer slope (O2 = 100 dB). For

input levels above T2, the transfer function exhibits a 1:1.4 expansion. For input levels below T2, the transfer function

exhibits a negative slope; for every dB the input decreases, the output increases by 1 dB. At an input level 62 dB below

T2 (132 dB), the transfer curve has risen 62 dB, for a net boost of 124 dB. The transfer curve at this input level is

24 dB above the 1:1 transfer curve. This boost value puts the DRC-derived gain coefficient into gain saturation. For

input levels below 132 dB, the gain coefficient remains constant at maximum gain and the transfer function exhibits

a 1:1 transfer slope, parallel to the 1:1 transfer curve but 24 dB above it.

At T1 (-150 dB), the transfer curve snaps back to the 1:1 transfer curve since O1 = 0 dB. The DRC gain coefficient

is no longer in gain saturation and for inputs below 150 dB, the transfer function exhibits a 1:1.5 expansion. The

change from a 1:1.5 expansion to a 1:1 transfer below 192 dB is the result of 32-bit dynamic range saturation.

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