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| 型號： | TAS5705PAPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP64 |
| 封裝： | 10 X 10 MM, GREEN, PLASTIC, HTQFP-64 |
| 文件頁數(shù)： | 31/72頁 |
| 文件大?。?/td> | 1168K |
| 代理商： | TAS5705PAPRG4 |
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SUB_ADDRESS_ENTRY
64
Τ1
=
= 10.63
6.0206
-
1
k =
1
n
-
1
Compression equation: k =
4 =
1
n =
0.3333:1 compression
n
3
-
-
-
d
(g /20)
offset
10
G
=
15.5
www.ti.com ................................................................................................................................................ SLOS549A – JUNE 2008 – REVISED SEPTEMBER 2009
Threshold Parameter Computation
For thresholds,
Tdb = –6.0206 TINPUT = –6.0206 TSUB_ADDRESS_ENTRY
If, for example, it is desired to set T1 = –64 dB, then the subaddress entry required to set T1 to –64 dB is
T1 is entered as a 32-bit number in 9.23 format. Therefore,
T1 = 10.63 = 0 1010.1010 0001 0100 0111 1010 111 = 0x0550 A3D7 in 9.23 format
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 has been 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, an n:1 compression is being performed.
For a 1:n expansion, the slope k can be found by
k = n – 1
For an n:1 compression, the slope k can be found by
(1)
In compression (n:1), n is implied to be greater than 1. For compression, Equation 1 means –1 < k < 0 for n > 1.
Thus k must always lie in the range k > –1.
With k = –4 then, 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 signal amplitude, the output decreases in signal amplitude.
DRC Offset Calculation
The DRC offset is calculated by
where gd = desired gain (in dB) and 15.5 is the the fixed antilog normalization factor. A value of gd = 0 indicates
no offset.
Copyright 2008–2009, Texas Instruments Incorporated
37
Product Folder Link(s): TAS5705
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