參數(shù)資料
型號(hào)： TDA7411
廠商： STMICROELECTRONICS
元件分類： 音頻控制
英文描述： 2 CHANNEL(S), TONE CONTROL CIRCUIT, PQFP44
封裝： 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44
文件頁(yè)數(shù)： 19/43頁(yè)
文件大小： 617K
代理商： TDA7411
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Product(s)
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TDA7411
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Figure 22. Block diagram of the noise blanker
In a first stage the spikes must be detected but to avoid a wrong triggering on high frequency (white) noise
a complex trigger control is implemented. Behind the trigger stage a pulse former generates the "blank-
ing"-pulse. An own biasing circuit supplies the noise blanker in order to avoid any cross talk to the signal
path.
Trigger Path
The incoming MPX signal is high pass filtered, amplified and rectified. This second order high pass filter
has a corner-frequency of 140kHz. The rectified signal, RECT, is low pass filtered to generate a signal
called PEAK. Also noise with a frequency 140kHz increases the PEAK voltage. The resulting voltage can
be adjusted by use of the noise rectifier discharge current. The PEAK voltage is fed to a threshold gener-
ator, which adds to the PEAK-voltage a DC-dependent threshold VTH. Both signals, RECT and
PEAK+VTH are fed to a comparator, which triggers a re-triggerable monoflop. The monoflop's output ac-
tivates the sample-and-hold circuits in the signal path for the selected duration.
Automatic Noise Controlled Threshold Adjustment (ATC)
There are mainly two independent possibilities for programming the trigger threshold:
1. the low threshold in 8 steps (bits D0 to D2 of the noise blanker byte)
2. and the noise adjusted threshold in 4 steps (bits D3 and D4 of the noise blanker-byte, see fig. 15).
The low threshold is active in combination with a good MPX signal without any noise; the PEAK voltage
is less than 1V. The sensitivity in this operation is high.
If the MPX signal is noisy (low fieldstrength) the PEAK voltage increases due to the higher noise, which is
also rectified. With increasing of the PEAK voltage the trigger threshold increases, too. This particular gain
is programmable in 4 steps (see fig. 17).
+
-
RECTIFIER
LOWPASS
RECT
+
THRESHOLD
GENERATOR
VTH
PEAK
ADDITIONAL
THRESHOLD
CONTROL
MONOFLOP
HOLDN
MPX
modAU856
MPOUT
CONTROL
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7411TR 功能描述:IC PROCESSOR CAR SIGNAL 44TQFP RoHS:否 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:- 其它有關(guān)文件:STA321 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應(yīng)用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6
TDA7412 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CARRADIO SIGNAL PROCESSOR
TDA7415 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
TDA7415CB 功能描述:音頻放大器 Car-radio Multimedia Signal (CMSP) 6-chnl RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA7415CBTR 功能描述:音頻放大器 Car-radio Multimedia Signal (CMSP) 6-chnl RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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