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参数资料
| 型号： | TAS3001CPW |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28 |
| 封装： | GREEN, PLASTIC, TSSOP-28 |
| 文件页数： | 17/55页 |
| 文件大小： | 432K |
| 代理商： | TAS3001CPW |
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41
4 Digital Audio Processor
4.1
Input Mixer Control
The TAS3001 is capable of mixing two channels of serial audio data. The mixer permits each input to scaled (
∞ to
+18 dB) independently and then a stereo summation is performed. One important function of this circuit is to scale
the input signals down to compensate for gains in the equalization settings and the bass and treble controls. This
prevents the system from exceeding the maximum digital signal output.
The mixer operation is controlled by loading values into the MIXER1 (07h) and MIXER2 (08h) control registers. The
mixer control values are in 4.20 format—4 bits for the integer and 20 bits for the fraction. The formula for converting
a 4.N number to dB is: dB = 20 log(X), where X is a positive 4.N number. To mute a mixer channel, 0s are loaded into
its respective mixer control register.
In order to transmit mixer control values over I2C, it is necessary to separate each value into three bytes. The first
nibble of byte 2 is the integer; the second nibble of byte 2 and bytes 1 and 0 are the fraction.
Table A7 contains dB converted into 4.20 numbers for the range –70 dB to 18 dB, although any positive 4.20 number
can be used.
The mixer operation is updated instantly in response to a control register change. This may cause audible artifacts
when changing mixer settings outside of fast load mode.
4.2
Biquad Block
The biquad block consists of six digital biquad filters per channel organized in a cascade structure as shown in
Figure 41. Each of these biquad filters has five downloadable 24-bit (4.20) coefficients. Each stereo channel has
independent coefficients.
Biquad 1
Biquad 2
Biquad N
Figure 41. Cascaded Biquad Filters
4.2.1
Filter Coefficients
The filter coefficients for the TAS3001 are downloaded through the I2C port and loaded into the biquad memory space.
Digital audio data coming into the device is processed by the biquad filters and then output from the device, usually
to an external DAC. Any biquad filter may be downloaded and processed by the TAS3001. The biquad structure that
is used for the parametric equalization filters is:
H(z)
+
b
0 )
b
1
Z–1
) b
2
Z–2
1
) a
1
Z–1
) a
2
Z–2
The coefficients for these filters are quantized and represented in 4.20 format—4 bits for the integer part and 20 bits
for the fractional part. Each biquad uses five coefficients to define the operation.
4.3
Volume Control Functions
4.3.1
Soft Volume Update
The TAS3001 implements a Texas Instruments proprietary soft volume update. This update allows a smooth and
pleasant-sounding change from one volume level to another over the entire range of volume (18 dB to mute).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS3001CPWG4 | 功能描述:音频 DSP Stero Audio Digital Equalizer RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TAS3001CPWR | 功能描述:音频 DSP Stero Audio Digital Equalizer RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TAS3001CPWRG4 | 功能描述:音频 DSP Stero Audio Digital Equalizer RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TAS3001EVM | 制造商:Texas Instruments 功能描述:TAS3001 EVALUATION BOARD - Bulk |
| TAS3001IN WAF | 制造商:Texas Instruments 功能描述: |
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