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TAS3004 Datasheet(PDF) 79 Page - Texas Instruments

Part # TAS3004
Description  Digital Audio Processor With Codec
PDF  80 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TAS3004 Datasheet(HTML) 79 Page - Texas Instruments

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A–13
Table A–16. Time Constants
HEXADECIMAL VALUE
TIME DELAY
40
1.7 ms
50
3.5 ms
60
6.7 ms
70
13 ms
80
26 ms
90
53 ms
A0
106 ms
B0
212 ms
C0
425 ms
D0
850 ms
E0
1.7 s
F0
2.4 s
A.7.6
DRCE Example With Threshold at –12 dB
From the DRCE example shown in Figure A–2, the threshold is set at –12 dB. The input energy E, has a value of
–6 dB.
Output (dB) = [T(dB) + ( E(dB) – T(dB) ) x (1/CR)]
= [–12 + (–6 – (–12)) x (1/3)] dB
= –12 + 2 = –10 dB
Where:
CR = Compression Ratio
T = Threshold (dB)
E = Energy estimate of current input
Note: Energy of sine wave is approximately 3 dB lower than peak.
0 dB
Output (dB)
Threshold = –12 dB
Threshold = –12 dB
0 dB
Final Output = –10 dB
Input (dB)
E = –6 dB
3:1 Above Threshold
Ratio for Compression
1:1 Below Threshold
Ratio for Compression
Figure A–2. DRCE Example With Threshold at –12 dB



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