參數(shù)資料
型號(hào)： TAS5518CPAG
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)： 29/103頁(yè)
文件大?。?/td> 2007K
代理商： TAS5518CPAG
B0017-01
Loudness
Biquad
H(z)
Audio Out
Audio In
V
Loudness Function = f(V)
2.9.1
Loudness Example
TAS5518C
8-Channel Digital Audio PWM Processor
www.ti.com
SLES238A – SEPTEMBER 2008 – REVISED JULY 2009
TAS5518C loudness implementation tracks the volume control setting to provide spectral compensation
for weak low- or high-frequency response at low volume levels. For the volume tracking function, both
linear and logarithmic control laws can be implemented. Any biquad filter response can be used to provide
the desired loudness curve. The control parameters for the loudness control are programmable via the I2C
interface.
The TAS5518C has a single set of loudness controls for the eight channels. In 6-channel mode, loudness
is available to the six speaker outputs and also to the line outputs. The loudness control input uses the
maximum individual master volume (V) to control the loudness that is applied to all channels. In the
192-kHz and 176.4-kHz modes, the loudness function is active only for channels 1, 2, and 8.
Figure 2-14. Loudness Compensation Functional Block Diagram
Loudness function = f(V) = G
× [2(Log V) × LG + LO] + O or alternatively,
Loudness function = f(V) = G
× [VLG × 2LO] + O
For example, for the default values LG = –0.5, LO = 0, G = 1, and O = 0, then:
Loudness function = 1/SQRT(V), which is the recommended transfer function for loudness. So,
Audio out = (audio in)
× V + H(Z) × SQRT(V). Other transfer functions are possible.
Table 2-6. Default Loudness Compensation Parameters
LOUDNESS
DESCRIPTION
USAGE
DATA
I2C
DEFAULT
TERM
FORMAT
SUB-
HEX
FLOAT
ADDRESS
V
Max volume
Gains audio
5.23
NA
Log V
Log2 (max volume)
Loudness function
5.23
NA
0000 0000
0.0
H(Z)
Loudness biquad
Controls shape of
5.23
0x95
b0 = 0000 D513
b0 = 0.006503
loudness curves
b1 = 0000 0000
b1 = 0
b2 = 0FFF 2AED
b2 = –0.006503
a1 = 00FE 5045
a1 = 1.986825
a2 = 0F81 AA27
a2 = –0.986995
LG
Gain (log space)
Loudness function
5.23
0x91
FFC0 0000
–0.5
LO
Offset (log space)
Loudness function
25.23
0x92
0000 0000
0
G
Gain
Switch to enable
5.23
0x93
0000 0000
0
loudness (ON = 1, OFF = 0)
O
Offset
Provides offset
25.23
0x94
0000 0000
0
Problem: Due to the Fletcher-Munson phenomena, compensation for low-frequency attenuation near 60
Hz is desirable. The TAS5518C provides a loudness transfer function with EQ gain = 6, EQ center
frequency = 60 Hz, and EQ bandwidth = 60 Hz.
Description
31
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TAS5518CPAGR 功能描述:音頻 DSP 8Ch Dig Audio PWM Proc 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
TAS5518PAG 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
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
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