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| 型号： | TAS3103IDBT |
| 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： | 136/148页 |
| 文件大小： | 1247K |
| 代理商： | TAS3103IDBT |
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Commands to reconfigure the reverb delay and delay lines should not be issued as standalone commands. When
new delay assignments are issued, the content of the 4K memory resource used to implement the delay lines is not
flushed. It takes a finite time for the memory to refill with samples in correspondence with its new assignments, and
until this time has elapsed, audio samples can be output on the wrong channel. For this reason, it is recommended
that all delay line assignment commands be preceded by a mute command, and followed by an unmute command.
CAUTION: There are no error flags issued if the delay line assignments exceed the
capacity of the 4K memory resource, but undefined and erratic behavior results if the
delay line capacity is exceeded.
3.7
Dynamic Range Control (DRC)
The DRC provides both compression and expansion capabilities over three separate and definable regions of audio
signal levels. Programmable threshold levels set the boundaries of the three regions. Within each of the three regions
a distinct compression or expansion transfer function can be established and the slope of each transfer function is
determined by programmable parameters. The offset (boost or cut) at the two boundaries defining the three regions
can also be set by programmable offset coefficients. The DRC implements the composite transfer function by
computing a 5.23 format gain coefficient from each sample output from the rms estimator. This gain coefficient is then
applied to a mixer element, whose other input is the audio data stream. The mixer output is the DRC-adjusted audio
data.
There are two distinct DRC blocks in the TAS3103. One DRC services two monaural channels—CH1 and CH2. This
DRC computes rms estimates of the audio data streams on both CH1 and CH2. The two estimates are then compared
on a sample-by-sample basis, and the larger of the two is used to compute the compression/expansion gain
coefficient. The gain coefficient is then applied to both CH1 and CH2 audio. The other DRC services only monaural
channel CH3. This DRC also computes an rms estimate of the signal level on CH3, and this estimate is used to
compute the compression/expansion gain coefficient applied to CH3 audio.
Figure 319 shows the positioning of the DRC block in the TAS3103 processing flow. As seen, the DRC input can
come from either before or after soft volume control and loudness processing, or can be a weighted combination of
both. The mixers feeding the DRC control the selection of which audio data stream or combination thereof, is input
into the DRC. The mixers also provide a means of gaining or attenuating the signal level into the DRC. If the DRC
setup is referenced to the 0-dB level at the TAS3103 input, the coefficient values for these mixers must be taken into
account. Discussions and examples that follow further explore the role the mixers play in setting up the transfer
function of the DRC.
Channel
BiQuad
Filter Bank
DRC-Derived
Gain Coefficient
From
Effects
Block
Base
and
Treble
Base and Treble
Bypass
Σ
Soft
Volume
Loudness
Σ
DRC Bypass
DRC
Input Mixer
DRC
Input Mixer
Σ
CH 1/2 DRC Only
Figure 319. DRC Positioning in TAS3103 Processing Flow
相关PDF资料 |
PDF描述 |
|---|---|
| TAS3103DBTRG4 | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103DBTR | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103IDBTRG4 | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103IDBTR | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| TAS3103IDCP | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| TAS3103IDBTRG4 | 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 |
| TAS3108 | 制造商:TI 制造商全称:Texas Instruments 功能描述:AUDIO DIGITAL SIGNAL PROCESSORS |
| TAS3108DCP | 功能描述:音频 DSP 8-Channel Audio DSP 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 |
| TAS3108DCPG4 | 功能描述:音频 DSP 8-Channel Audio DSP 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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