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參數(shù)資料
| 型號(hào)： | TAS3004PFBG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | GREEN, PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 32/84頁 |
| 文件大小： | 671K |
| 代理商： | TAS3004PFBG4 |
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5–1
5 Filter Processor
5.1
Biquad Block
The biquad block consists of seven digital biquad filters per channel organized in a cascade structure, as shown in
Figure 5–1. Each of these biquad filters has five downloadable 24-bit (4.20) coefficients. Each stereo channel has
independent coefficients.
Biquad 2 ...
Biquad 1
Biquad N
Figure 5–1. Biquad Cascade Configuration
5.1.1
Filter Coefficients
The filter coefficients for the TAS3004 device are downloaded through the I2C port and loaded into the biquad memory
space. Each biquad filter memory space has an independent address. Digital audio data coming into the device is
processed by the biquad block and then converted into analog waveforms by the DAC. Alternately, filters can be
loaded by asserting terminals on the GPI port.
5.1.2
Biquad Structure
The biquad structure that is used for the parametric equalization filters is as follows:
H(z)
+
b
0 )
b
1
z*1
) b
2
z*2
a
0 )
a
1
z*1
) a
2
z*2
NOTE: a0 is fixed at value 1 and is not downloadable.
The coefficients for these filters are represented in 4.20 format—4 bits for the integer part and 20 bits for the fractional
part. In order to transmit them over I2C, it is necessary to separate each coefficient into three bytes. The upper 4 bits
of byte 2 is the integer part, and the second nibble of byte 2, byte 1, and byte 0 are the fractional parts.
The filters can be designed using the automatic loudspeaker equalization program (ALE) or a script running under
MatLab named Filtermaker. Both of these tools are available from Texas Instruments.
(1)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TAS3004PFBR | 功能描述:音頻 DSP Digital Audio Processor w/ Codec 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 |
| TAS3004PFBRG4 | 功能描述:音頻 DSP Digital Audio Processor w/ Codec 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 |
| TAS3103 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Digital Audio Processor With 3D Effects |
| TAS3103A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Digital Audio Processor With 3D Effects |
| TAS3103ADBT | 功能描述:音頻 DSP Digital Audio Processor w/ 3D Eff 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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