參數(shù)資料
型號(hào)： TAS5504PAGG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 27/96頁(yè)
文件大?。?/td> 1216K
代理商： TAS5504PAGG4
Introduction
25
SLES123 October 2004
TAS5504
Time
Decay
Attack
Signal
Amplitude
td +* 1 Fs
N(1 * D)
ta +* 1 Fs
N(1 * A)
Figure 119. TAS5504 Attack and Decay Definition
1.10.2
Compression/Expansion Coefficient Computation Engine Parameters
There are seven programmable parameters assigned to each DRC block: two threshold parameters - T1 and
T2, two offset parameters - O1 and O2, and three slope parameters - k0, k1, and k2. The threshold parameters
establish the three regions of the DRC transfer curve, the offsets anchor the transfer curve by establishing
known gain settings at the threshold levels, and the slope parameters define whether a given region is a
compression or an expansion region.
The audio input stream into the DRC must pass through DRC-dedicated programmable input mixers. These
mixers are provided to scale the 32-bit input into the DRC to account for the positioning of the audio data in
the 48-bit DAP word and the net gain or attenuation in signal level between the SAP input and the DRC. The
selection of threshold values must take the gain (attenuation) of these mixers into account. The DRC
implementation examples that follow illustrate the effect these mixers have on establishing the threshold
settings.
T2 establishes the boundary between the high-volume region and the mid-volume region. T1 establishes the
boundary between the mid-volume region and the low-volume region. Both thresholds are set in logarithmic
space, and which region is active for any given rms estimator output sample is determined by the logarithmic
value of the sample.
Threshold T2 serves as the fulcrum or pivot point in the DRC transfer function. O2 defines the boost (> 0 dB)
or cut (< 0 dB) implemented by the DRC-derived gain coefficient for an rms input level of T2. If O2 = 0 dB, the
value of the derived gain coefficient is 1.0 (0x00, 80, 00, 00 in 5.23 format). k2 is the slope of the DRC transfer
function for rms input levels above T2 and k1 is the slope of the DRC transfer function for rms input levels below
T2 (and above T1). The labeling of T2 as the fulcrum stems from the fact that there cannot be a discontinuity
in the transfer function at T2. The user can, however, set the DRC parameters to realize a discontinuity in the
transfer function at the boundary defined by T1. If no discontinuity is desired at T1, the value for the offset term
O1 must obey the following equation.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TAS5504PAGR 功能描述:音頻 DSP 4 Ch Digital Audio PWM Processor 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
TAS5504PAGRG4 功能描述:音頻 DSP 4 Ch Digital Audio PWM Processor 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
TAS5508 制造商:TI 制造商全稱:Texas Instruments 功能描述:8 Channel Digital Audio PWM Processor
TAS5508-5121K8EVM 功能描述:音頻 IC 開發(fā)工具 TAS5508-TAS5121K8 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
TAS5508-5122C6EVM 功能描述:音頻 IC 開發(fā)工具 TAS5508-5122C6 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
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