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參數(shù)資料
| 型號： | TAS3004PFBRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | GREEN, PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 29/84頁 |
| 文件大?。?/td> | 671K |
| 代理商： | TAS3004PFBRG4 |
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4–6
4.10 Dynamic Range Compression/Expansion
The TAS3004 device provides the user with the ability to manage the dynamic range of the audio system. The DRCE
receives data, and affects scaling after the volume/loudness block. As shown in Figure 4–4, the DRCE is applied after
the volume/loudness control block as a DRCE scale factor. The DRCE must be adjusted such that the signal does
not reach the hard limit value. However, if the signal does reach the maximum digital value, the saturation logic serves
as a hard limiter that does not allow the signal to extend beyond the available range.
SDIN2_L
(7)
2nd Order
IIR Filters
Bass/
Treble
Soft
Volume/
LEFT_OUT
Loudness
(Parametric
Equalization)
(Tone)
LEFT_SUM
SDIN1_L
(Left Channel Mixer)
ANALOGIN_L
(DRCE Scaling)
Saturation
Logic
Dynamic
Range
Control
(Analog in From ADC)
SDIN2_R
(7)
2nd Order
IIR Filters
Bass/
Treble
Soft
Volume/
RIGHT_OUT
Loudness
(Parametric
Equalization)
(Tone)
RIGHT_SUM
SDIN1_R
(Right Channel Mixer)
ANALOGIN_R
(DRCE Scaling)
Saturation
Logic
Figure 4–4. TAS3004 Digital Signal Processing Block Diagram
The DRCE instruction consists of eight bytes that must be sent each time in the order shown in the example code
of Table A–9. Each instruction downloaded must be eight bytes. If only one byte is changed, all eight bytes must be
transmitted. The first two bytes remain the same for every instruction, however the last six bytes can be programmed
using hexadecimal values from the corresponding tables referred to in Section A.7.
With high compression ratios and fast attack times available, this function is suited for a commercial killer in a
television set application.
4.11 AllPass Function
This function is enabled by setting terminal 27 (ALLPASS) on the TAS3004 device to 1. When asserted, the internal
equalization filters are set into AllPass (flat) mode. When this terminal is reset to 0, the equalization filters are returned
to the equalization that was in use before the terminal was asserted.
In AllPass mode, the bass and treble controls are still functional.
This function is frequently used for headphones. When the headphone plug is inserted into its jack, a switched contact
in the jack enables the AllPass function.
The AllPass function also can be activated by writing a 1 to bit 2 of the analog control register.
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| TAS3103 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Digital Audio Processor With 3D Effects |
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| TAS3103ADBT | 功能描述:音頻 DSP Digital Audio Processor w/ 3D Eff 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 |
| TAS3103ADBTG4 | 功能描述:音頻 DSP Digital Audio Processor w/ 3D Eff 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 |
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