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參數(shù)資料
| 型號： | TAS5518PAG |
| 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)： | 33/105頁 |
| 文件大?。?/td> | 1514K |
| 代理商： | TAS5518PAG |
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Introduction
25
SLES115 — August 2004
TAS5518
7 Biquads
in Series
Bass and
Treble
Bass & Treble
By-Pass
Bass & Treble
In-Line
Loudness
DRC
In-Line
DRC
By-Pass
From Input Mixer
Max
Volume
Pre-
Volume
Post-
Volume
Channel
Volume
Master
Volume
To Output
Mixer
Figure 119. DRC Positioning in TAS5518 Processing Flow
Figure 120 illustrates a typical DRC transfer function.
k2
T2
k1
k0
T1
O1
O2
DRC Input Level
DRC
Compensated
Output
1:1 Transfer Function
Implemented Transfer Fucntion
Region
0
Region
1
Region
2
Figure 120. Dynamic Range Compression (DRC) Transfer Function Structure
The three regions shown in Figure 120 are defined by three sets of programmable coefficients:
Thresholds T1 and T2—define region boundaries.
Offsets O1 and O2—define the DRC gain coefficient settings at thresholds T1 and T2 respectively.
Slopes k0, k1, and k2—define whether compression or expansion is to be performed within a given region.
The magnitudes of the slopes define the degree of compression or expansion to be performed.
The three sets of parameters are all defined in logarithmic space and adhere to the following rules:
The maximum input sample into the DRC is referenced at 0 dB. All values below this maximum value then
have negative values in logarithmic (dB) space.
The samples input into the DRC are 32-bit words and consist of the upper 32 bits of the 48-bit word format
used by the digital audio processor (DAP). The 48-bit DAP word is derived from the 32-bit serial data
received at the serial audio receive port by adding 8 bits of headroom above the 32-bit word and 8 bits
of computational precision below the 32-bit word. If the audio processing steps between the SAP input
and the DRC input result in no accumulative boost or cut, the DRC would operate on the 8 bits of headroom
and the 24 MSBs of the audio sample. Under these conditions, a 0-dB (maximum value) audio sample
(0x7FFFFFFF) is seen at the DRC input as a –48-dB sample (8 bits x 6.02 dB/bit = 48 dB).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| TAS5518PAGRG4 | 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 |
| TAS5538 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TAS5612L-TAS5614LDDVEVM |
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