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| 型號： | TLV320AIC34_1 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | Codec |
| 英文描述： | FOUR-CHANNEL, LOW-POWER AUDIO CODEC FOR PORTABLE AUDIO/TELEPHONY |
| 中文描述： | 四通道，低功耗音頻編解碼器的便攜式音頻/電話 |
| 文件頁數(shù)： | 38/94頁 |
| 文件大?。?/td> | 905K |
| 代理商： | TLV320AIC34_1 |
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DIGITAL AUDIO PROCESSING FOR PLAYBACK
The DAC channel consists of optional filters for de-emphasis and bass, treble, midrange level adjustment,
speaker equalization, and 3-D effects processing. The de-emphasis function is implemented by a programmable
digital filter block with fully programmable coefficients (see page 1, registers 21–26 for left channel, page 1,
registers 47–52 for right channel). If de-emphasis is not required in a particular application, this programmable
filter block can be used for some other purpose. The de-emphasis filter transfer function is given by:
H(z)
N0
N1
z
1
32768
D1
z
1
(2)
N0
2
N1
z
1
N2
z
2
32768
2
D1
z
D2
z
2
N3
2
N4
z
1
N5
z
2
32768
2
D4
z
1
D5
z
2
(3)
LB1
LB2
RB1
RB2
B0154-01
TLV320AIC34
SLAS538A–OCTOBER 2007–REVISED NOVEMBER 2007
where the N0, N1, and D1 coefficients are fully programmable individually for each channel. The coefficients that
should be loaded to implement standard de-emphasis filters are given in
Table 4
.
Table 4. De-Emphasis Coefficients for Common Audio Sampling Rates
SAMPLING FREQUENCY (kHz)
32
44.1
48
N0
N1
D1
16,950
15,091
14,677
–1,220
–2,877
–3,283
17,037
20,555
21,374
In addition to the de-emphasis filter block, the DAC digital effects processing includes a fourth-order digital IIR
filter with programmable coefficients (one set per channel). This filter is implemented as a cascade of two biquad
sections with frequency response given by:
The N and D coefficients are fully programmable, and the entire filter can be enabled or bypassed. The structure
of the filtering when configured for independent channel processing is shown in
Figure 28
, with LB1
corresponding to the first left-channel biquad filter using coefficients N0, N1, N2, D1, and D2. LB2 similarly
corresponds to the second left-channel biquad filter using coefficients N3, N4, N5, D4, and D5. The RB1 and
RB2 filters refer to the first and second right-channel biquad filters, respectively.
Figure 28. Structure of the Digital Effects Processing for Independent Channel Processing
The coefficients for this filter implement a variety of sound effects, with bass boost or treble boost being the most
commonly used in portable audio applications. The default N and D coefficients in the part are given in
Table 5
and implement a shelving filter with 0-dB gain from dc to approximately 150 Hz, at which point it rolls off to a
3-dB attenuation for higher-frequency signals, thus giving a 3-dB boost to signals below 150 Hz. The N and D
coefficients are represented by 16-bit, 2s-complement numbers with values ranging from –32,768 to 32,767.
38
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Copyright 2007, Texas Instruments Incorporated
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TLV320AIC34
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| TLV320AIC34EVM-K | 功能描述:音頻 IC 開發(fā)工具 TLV320AIC34EVM-K Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TLV320AIC34IZAS | 功能描述:接口—CODEC Low-Pwr 4-channel CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| TLV320AIC34IZASR | 功能描述:接口—CODEC Low-Pwr 4-channel CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| TLV320AIC36 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low Power Stereo Audio Codec With Embedded miniDSP |
| TLV320AIC36EVM-K | 功能描述:音頻 IC 開發(fā)工具 TLV320AIC36 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
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