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参数资料
| 型号： | TAS5518PAGR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 36/105页 |
| 文件大小： | 1514K |
| 代理商： | TAS5518PAGR |
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Introduction
28
SLES115 — August 2004
TAS5518
1.11.2.2 Offset Parameter Computation
The offsets set the boost or cut applied by the DRC-derived gain coefficient at the threshold point. An
equivalent statement is that offsets represent the departure of the actual transfer function from a 1:1 transfer
at the threshold point. Offsets are 25.23 formatted 48-bit logarithmic numbers. They are computed by the
following equation.
OINPUT +
ODESIRED ) 24.0824 dB
6.0206
Gains or boosts are represented as negative numbers; cuts or attenuation are represented as positive
numbers. For example, to achieve a boost of 21 dB at threshold T1, the I2C coefficient value entered for O1
must be:
O1INPUT +
–21 dB ) 24.0824 dB
6.0206
+ 0.51197555
+ 0.1000_0011_0001_1101_0100
+ 0x00000041886A in 25.23 format
More examples of offset computations are included in the following examples.
1.11.2.3 Slope Parameter Computation
In developing the equations used to determine the subaddress of the input value required to realize a given
compression or expansion within a given region of the DRC, the following convention is adopted.
DRC Transfer = Input Increase : Output Increase
If the DRC realizes an output increase of n dB for every dB increase in the rms value of the audio into the DRC,
a 1:n expansion is being performed. If the DRC realizes a 1 dB increase in output level for every n dB increase
in the rms value of the audio into the DRC, a n:1 compression is being performed.
For 1:n expansion, the slope k can be found by:
k = n 1
For n:1 compression, the slope k can be found by: k + 1n–1
In both expansion (1:n) and compression (n:1), n is implied to be greater than 1. Thus, for expansion:
k = n 1 means k > 0 for n > 1. Likewise, for compression, k + 1n–1 means 1 < k < 0 for n > 1. Thus, it appears
that k must always lie in the range k > 1.
The DRC imposes no such restriction and k can be programmed to values as negative as 15.999. To
determine what results when such values of k are entered, it is first helpful to note that the compression and
expansion equations for k are actually the same equation. For example, a 1:2 expansion is also a 0.5:1
compression.
0.5 Compression k + 1
0.5
–1 + 1
1:2Expansion k + 2–1 + 1
As can be seen, the same value for k is obtained either way. The ability to choose values of k less than 1 allows
the DRC to implement negative slope transfer curves within a given region. Negative slope transfer curves
are usually not associated with compression and expansion operations, but the definition of these operations
can be expanded to include negative slope transfer functions. For example, if k = 4
Compression Equation : k +*4 + 1n *1 n + –
1
3 *
0.3333 : 1 compression
Expansion Equation : k +*4 + n–1 n + –3 1: *3 expansion
With k = 4, the output decreases 3 dB for every 1 dB increase in the rms value of the audio into the DRC.
As the input increases in volume, the output decreases in volume.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS5518PAGRG4 | 功能描述:音频 DSP 8 Ch Digital Audio PWM Processor RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TAS5538 | 制造商:TI 制造商全称:Texas Instruments 功能描述:TAS5612L-TAS5614LDDVEVM |
| TAS5538DGG | 制造商:TI 制造商全称:Texas Instruments 功能描述:TAS5612L-TAS5614LDDVEVM |
| TAS5538DGGR | 制造商:Texas Instruments 功能描述:audio processor |
| TAS5548 | 制造商:TI 制造商全称:Texas Instruments 功能描述:8-Channel HD Compatible Audio Processor with ASRC and PWM Output |
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