參數(shù)資料
型號： TAS5508BPAGRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁數(shù)： 30/103頁
文件大小： 1198K
代理商： TAS5508BPAGRG4
f Frequency Hz
Gain
dB
10
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1k
G001
20
0
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10k
2.10 Dynamic Range Control (DRC)
TAS5508B
8-Channel Digital Audio PWM Processor
SLES162C – DECEMBER 2005 – REVISED JULY 2009
www.ti.com
Solution: Using Texas Instruments ALE TAS5508B DSP tool, Matlab, or other signal-processing tool,
develop a loudness function with the parameters listed in Table 2-7.
Table 2-7. Example Loudness Function Parameters
LOUDNESS
DESCRIPTION
USAGE
DATA
I2C
EXAMPLE
TERM
FORMAT
SUB-
HEX
FLOAT
ADDRESS
H(Z)
Loudness biquad
Controls shape of
5.23
0x95
b0 = 0000 8ACE
b0 = 0.004236
loudness curves
b1 = 0000 0000
b1 = 0
b2 = FFFF 7532
b2 = –0.004236
a1 = FF01 1951
a1 = –1.991415
a2 = 007E E914
a2 = 0.991488
LG
Loudness gain
Loudness function
5.23
0x91
FFC0 0000
–0.5
LO
Loudness offset
Loudness function
25.23
0x92
0000 0000
0
G
Gain
Switch to enable
5.23
0x93
0080 0000
1
loudness (ON = 1, OFF = 0)
O
Offset
25.23
0x94
0000 0000
0
See Figure 2-15 for the resulting loudness function at different gains.
Figure 2-15. Loudness Example Plots
DRC provides both compression and expansion capabilities over three separate and definable regions of
audio signal levels. Programmable threshold levels set the boundaries of the three regions. Within each of
the three regions, a distinct compression or expansion transfer function can be established and the slope
of each transfer function is determined by programmable parameters. The offset (boost or cut) at the two
boundaries defining the three regions can also be set by programmable offset coefficients. The DRC
implements the composite transfer function by computing a 5.23-format gain coefficient from each sample
output from the rms estimator. This gain coefficient is then applied to a mixer element, whose other input
is the audio data stream. The mixer output is the DRC-adjusted audio data.
The TAS5508B has two distinct DRC blocks. DRC1 services channels 1–7 in the 8-channel mode and
channels 1–4 and 7 in the 6-channel mode. This DRC computes rms estimates of the audio data streams
on all channels that it controls. The estimates are then compared on a sample-by-sample basis and the
larger of the estimates is used to compute the compression/expansion gain coefficient. The gain
coefficient is then applied to the appropriate channel audio streams. DRC2 services only channel 8. This
DRC also computes an rms estimate of the signal level on channel 8 and this estimate is used to compute
the compression/expansion gain coefficient applied to the channel-8 audio stream.
Description
32
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TAS5508C 制造商:TI 制造商全稱:Texas Instruments 功能描述:8-Channel Digital Audio PWM Processor
TAS5508CPAG 功能描述:音頻 DSP 8Ch 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
TAS5508CPAGR 功能描述:音頻 DSP 8Ch 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
TAS5508CPAGR 制造商:Texas Instruments 功能描述:IC Digital Audio PWM Processor 64-TQFP
TAS5508PAG 功能描述:音頻 DSP 8Ch Dig Aud 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
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