參數(shù)資料
型號： TAS3103DBTR
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDSO38
封裝： GREEN, PLASTIC, TSSOP-38
文件頁數(shù)： 142/148頁
文件大?。?/td> 1247K
代理商： TAS3103DBTR
334
3.7.2.2 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.
O
INPUT +
O
DESIRED )
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:
O1
INPUT +
–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.
3.7.2.3 Slope Parameter Computation
In developing the equations used to determine the subaddress 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
+ 1
n –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
+ 1
n –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 : 2 Expansion
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 + 1
n *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
TAS3103DBTRG4 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
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
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