參數(shù)資料
型號(hào)： TAS5518PAG
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 36/105頁(yè)
文件大?。?/td> 1514K
代理商： TAS5518PAG
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TAS5518PAG 制造商:Texas Instruments 功能描述:Pulse Width Modulation (PWM) Controller
TAS5518PAGG4 功能描述:音頻 DSP 8 Ch Digital Audio PWM 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
TAS5518PAGR 功能描述:音頻 DSP 8 Ch Digital Audio PWM 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
TAS5518PAGRG4 功能描述:音頻 DSP 8 Ch Digital Audio PWM 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
TAS5538 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:TAS5612L-TAS5614LDDVEVM
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