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| 型号： | TAS3103DBTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| 封装： | GREEN, PLASTIC, TSSOP-38 |
| 文件页数： | 117/148页 |
| 文件大小： | 1247K |
| 代理商： | TAS3103DBTG4 |
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311
The direct form I structure provides a separate delay element and mixer (gain coefficient) for each node in the biquad
filter. Each mixer output is a signed 76-bit product of a signed 48-bit data sample (25.23 format number) and a signed
28-bit coefficient (5.23 format number). A 76-bit ALU in the TAS3103 allows the 76-bit resolution to be retained when
summing the mixer outputs (filter products). This is an important factor as it removes the need to carefully tailor the
order of addition for each filter implementation to minimize the effects of finite-precision arithmetic. Intermediate
overflows are allowed while summing the biquad terms to further minimize the effects of finite-precision arithmetic
(see the Digital Audio Processor – DAP – Arithmetic Unit section for more discussion on intermediate overflow).
3.5
Bass and Treble Processing
The TAS3103 has three fully independent bass and treble adjustment blocks—one for each of the three monaural
channels. Adjustments in bass and treble are accomplished by selecting a bass filter set and a treble filter set, and
then selecting a shelf filter within each filter set. The filter set selected, of which there are five sets for treble and five
sets for bass to select from, determines the frequency at which the bass and treble adjustments take effect. The shelf
filters determine the gain to be applied to the bass and treble components of the incoming audio. All selections are
independent of one another—any bass filter set can be combined with any treble filter set and any shelf filter can be
selected in a given filter set.
Figure 312 shows the bass and treble selections available, their I2C subaddresses, and the data fields in each
subaddress used to make the selections. Each bass filter set has 150 low pass shelving filters to choose from, with
the shelves ranging from a cut (attenuation) of 18 dB to a boost (gain) of 18 dB. A shelf selection of 0 dB effectively
removes bass processing. All 150 filters in a given filter set have the same 3-dB frequency, as measured from the
shelf. The only difference in the 150 filters in a given bass filter set is the gain of the shelf.
Each treble filter set has 150 high-pass shelving filters to choose from, with the shelves again ranging from a cut
(attenuation) of 18 dB to a boost (gain) of 18 dB. A shelf selection of 0 dB effectively removes treble processing. All
150 filters in a given filter set have the same 3-dB frequency, as measured from the shelf. The only difference in the
150 filters in a given treble filter set is the gain of the shelf.
Commands to adjust the bass and treble levels within a given filter set (by commanding the selection of different
shelving filters) results in a soft adjustment to the newly commanded levels. The filters are labeled 1 through 150,
with filter #1 implementing the maximum cut (18 dB) and filter #150 implementing the maximum boost (18 dB). If a
command is received to change a shelf setting, the transition is made by stepping through each filter, one at a time,
until the shelf filter commanded is reached. A soft transition is achieved by residing at each step (or shelf filter) for
a period determined by the programmable parameter TBLC (bit field 7:0 of subaddress 0xF1). The time period set
by TBLC is TBLC/FS (where FS is the audio sample rate). For an audio sample rate of 48 kHz and a TBLC setting
of 64, the dwell time on each shelf filter is approximately 1.33 ms. The transition time then depends on the number
of shelves separating the current and commanded shelf values. For 48-kHz audio and a TBLC setting of 64, a
maximum transition time of approximately 198 ms is required to transition from shelf #1 to shelf #150 and a minimum
time of approximately 1.33 ms is required to transition from shelf x to shelf x + 1.
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相关代理商/技术参数 |
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| TAS3103DBTR | 功能描述:音频 DSP Digital Audio Processor 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 |
| TAS3103DBTRG4 | 功能描述:音频 DSP Digital Audio Processor 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 |
| TAS3103EVM | 功能描述:音频 DSP TAS3103 Eval Mod 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 |
| TAS3103IDBT | 功能描述:音频 DSP Digital Audio Processor 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 |
| TAS3103IDBTR | 功能描述:音频 DSP Digital Audio Processor 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 |
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