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參數(shù)資料
| 型號： | TAS3103DBTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| 封裝： | GREEN, PLASTIC, TSSOP-38 |
| 文件頁數(shù)： | 137/148頁 |
| 文件大?。?/td> | 1247K |
| 代理商： | TAS3103DBTG4 |
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330
Figure 320 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 320. Dynamic Range Compression (DRC) Transfer Function Structure
The three regions shown in Figure 320 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).
Thresholds T1 and T2 define, in dB, the boundaries of the three regions of the DRC, as referenced to the
rms value of the data into the DRC. Zero valued threshold settings reference the maximum valued rms input
into the DRC and negative valued thresholds reference all other rms input levels. Positive valued thresholds
have no physical meaning and are not allowed. In addition, zero valued threshold settings are not allowed.
Although the DRC input is limited to 32-bit words, the DRC itself operates using the 48-bit word format of the DAP.
The 32-bit samples input into the DRC are placed in the upper 32 bits of this 48-bit word space. This means that the
threshold settings must be programmed as 48-bit (25.23 format) numbers.
CAUTION:
Zero valued and positive valued threshold settings are not
allowed and cause unpredictable behavior if used.
Offsets O1 and O2 define, in dB, the attenuation (cut) or gain (boost) applied by the DRC-derived gain
coefficient at the threshold points T1 and T2 respectively. Positive offsets are defined as cuts, and thus boost
or gain selections are negative numbers. Offsets must be programmed as 48-bit (25.23 format) numbers.
Slopes k0, k1, and k2 define whether compression or expansion is to be performed within a given region,
and the degree of compression or expansion to be applied. Slopes are programmed as 28-bit (5.23 format)
numbers.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TAS3103DBTR | 功能描述:音頻 DSP Digital Audio Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| TAS3103DBTRG4 | 功能描述:音頻 DSP Digital Audio Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| TAS3103EVM | 功能描述:音頻 DSP TAS3103 Eval Mod RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| TAS3103IDBT | 功能描述:音頻 DSP Digital Audio Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| TAS3103IDBTR | 功能描述:音頻 DSP Digital Audio Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
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