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參數(shù)資料
| 型號(hào)： | TAS3103DBTRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| 封裝： | GREEN, PLASTIC, TSSOP-38 |
| 文件頁數(shù)： | 143/148頁 |
| 文件大?。?/td> | 1247K |
| 代理商： | TAS3103DBTRG4 |
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3.7.3
DRC Compression/Expansion Implementation Examples
The following four examples illustrate the steps that must be taken to calculate the DRC compression/expansion
coefficients for a specified DRC transfer function. The first example is an expansion/compression/expansion
implementation without discontinuities in the transfer function and represents a typical application. This first example
also illustrates one of the three modes of DRC saturation—32-bit dynamic range limitation saturation. The second
example is a compression/expansion/compression implementation. There is no discontinuity at T1 and 32-bit
dynamic range saturation occurs at low volume levels into the DRC. Example 2 also illustrates another form of DRC
saturation—maximum gain saturation. Example 3 illustrates the concept of infinite compression. Also, in Example 3,
32-bit dynamic range saturation occurs at low volume levels and the third form of DRC saturation is
illustrated—minimum gain saturation. Example 4 illustrates the ability of the DRC to realize a negative slope transfer
function. This example also illustrates two of the three forms of saturation—32-bit dynamic range saturation at low
volume levels and minimum gain saturation.
CAUTION:
The examples presented all exhibit some form of DRC saturation. This is not intended
to imply that all (or most) DRC transfer implementation exhibit some form of saturation.
Most practical implementations do not exhibit saturation. The examples are chosen to
explain by example the three types of saturation that can be encountered. But the
phenomenon of saturation can also be used to advantage in that it effectively provides
a means to implement more than three zones or regions of operation. If saturation is
intended, the regions exhibiting the transfer characteristic set by k0, k1, and k2 provide
three regions and the regions exhibiting saturation provide the additional regions of
operation.
3.7.3.1 Example 1—Expansion/Compression/Expansion Transfer Function With 32-Bit
Dynamic Range Saturation
For this example, the following transfer characteristics are chosen.
Threshold point 2: T2 = 26 dB, O2 = 30 dB
Threshold point 1: T1 = 101 dB, O1 = 7.5 dB
Region 0 slope: k0 = 0.05
≥ 1:1.05 Expansion
Region 1 slope: k1 = 0.5
≥ 2:1 Compression
Region 2 slope: k2 = 0.1
≥ 1:1.1 Expansion
The thresholds T1 and T2 are typically referenced, by the user, to the 0-dB signal level into the TAS3103. But to
determine the equivalent threshold point at the DRC input, it is necessary to take into account the processing gain
(or loss) between the TAS3103 SAP input and the DRC. Assume, as an example, the processing gain structure shown
in Figure 322. Inputting the data below the 8-bit headroom in the 48-bit DAP word and then routing only the upper
32 bits of the 48-bit word into the DRC, results in a 48-dB (8 bits x 6 dB/bit = 48 dB) attenuation of the signal level
into the DRC. Channel processing gain and use of the dedicated mixer into the DRC can revise this apparent 48-dB
attenuation in signal level into the DRC. In Figure 322, the 24 mixer gain into the DRC, coupled with a net channel
gain of 0 dB, changes the net 48-dB attenuation of the signal level into the DRC to a net attenuation of 24 dB.
For slopes:
Region 0 = 1:1.05 Expansion
≥ k0 = 1.05 1 = 0.05
= 00000.0000_1100_1100_1100_1100_110
= 0x0066666 in 5.23 format
Region 1 = 2:1 Compression
≥ k1 = 1/2 1 = -0.5
= 11111.1000_0000_0000_0000_0000_000
= 0xFC00000 in 5.23 format
Region 2 = 1:1.1 Expansion
≥ k2 = 1.1 1 = 0.1
= 00000.0001_1001_1001_1001_1001_100
= 0x00CCCCC in 5.23 format
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TAS3103DBTR | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103IDBTRG4 | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103IDBTR | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103IDCP | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103DBTG4 | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TAS3103EVM | 功能描述:音頻 DSP TAS3103 Eval Mod RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| TAS3103IDBT | 功能描述:音頻 DSP Digital Audio Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| TAS3103IDBTR | 功能描述:音頻 DSP Digital Audio Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| TAS3103IDBTRG4 | 功能描述:音頻 DSP Digital Audio Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| TAS3108 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:AUDIO DIGITAL SIGNAL PROCESSORS |
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