參數(shù)資料
型號(hào): TAS5518PAG
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝: GREEN, PLASTIC, TQFP-64
文件頁數(shù): 31/105頁
文件大?。?/td> 1514K
代理商: TAS5518PAG
Introduction
23
SLES115 — August 2004
TAS5518
1.10.1
Loudness Example
Problem: Due to the Fletcher-Munson phenomena, we want to compensate for low frequency attenuation near
60 Hz. The TAS5518 provides a loudness transfer function with EQ gain = 6, EQ center frequency = 60 Hz,
and EQ bandwidth = 60 Hz.
Solution: Using Texas Instruments ALE TAS5518 DSP tool, Matlab, or other signal-processing tool, develop
a loudness function with following parameters:
Table 17. Loudness Function Parameters
LOUDNESS
DESCRIPTION
USAGE
DATA
I2C
EXAMPLE VALUES
LOUDNESS
TERM
DESCRIPTION
USAGE
DATA
FORMAT
I C
SUBADDRESS
HEX
FLOAT
H (Z)
Loudness Biquad
Controls shape of
loudness curves
5.23
0x95
b0 = 00008ACE
b1 = 00000000
b2 = FFFF7532
a1 = FF011951
a2 = 007EE914
b0 = 0.004236
b1 = 0
b2 = 0.004236
a1 = 1.991415
a2 = 0.991488
LG
Loudness Gain
Loudness function
5.23
0x91
FFC00000
0.5
LO
Loudness Offset
Loudness function
25.23
0x92
00000000
0
G
Gain
Switch to Enable
Loudness (ON = 1,
OFF = 0)
5.23
0x93
00800000
1
O
Offset
25.23
0x94
00000000
0
See Figure 118 for the resulting loudness function at different gains.
Figure 118. Loudness Example Plots
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