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參數(shù)資料
| 型號： | TDA7411 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | ADVANCED CAR SIGNAL PROCESSOR |
| 中文描述： | 先進(jìn)的汽車信號處理器 |
| 文件頁數(shù)： | 27/43頁 |
| 文件大?。?/td> | 581K |
| 代理商： | TDA7411 |
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TDA7411
ADDITIONAL THRESHOLD CONTROL MECHANISM
Automatic Threshold Control by the Stereoblend voltage
Besides the noise controlled threshold adjustment there is an additional possibility for influencing the trig-
ger threshold. It is depending on the stereoblend control.
The point where the MPX signal starts to become noisy is fixed by the RF part. Therefore also the starting
point of the normal noise-controlled trigger adjustment is fixed (fig. 17). In some cases the behavior of the
noise blanker can be improved by increasing the threshold even in a region of higher fieldstrength. Some-
times a wrong triggering occurs for the MPX signal often shows distortion in this range, which can be
avoided even if using a low threshold. Because of the overlap of this range and the range of the stereo/
mono transition it can be controlled by stereoblend. This threshold increase is programmable in 3 steps
or switched off with bits D
0
and D
1
of the fieldstrength control-byte.
Over Deviation Detector
If the system is tuned to stations with a high deviation the noise blanker can trigger on the higher frequen-
cies of the modulation. To avoid this wrong behavior, which causes noise in the output signal, the noise
blanker offers a deviation-dependent threshold adjustment. By rectifying the MPX signal a further signal
representing the actual deviation is obtained. It is used to increase the PEAK voltage. Offset and gain of
this circuit are programmable in 3 steps with the bits D
6
and D
7
of the stereo decoder-byte (the first step
turns off the detector, see fig. 16).
Multipath-Level
To react on high repetitive spikes caused by a Multipath-situation, the discharge-time of the PEAK voltage
can be decreased depending on the voltage-level at Pin MPout. There are two ways to do this. One way
is to switch on the linear influence of the Multipath-Level on the PEAK-signal (D7 of field strength control
byte). In this case the discharge slew rate is 1V/ms
1
. The second possibility is to activate a function, which
switches to the 18k discharge if the Multipath-Level is below 2.5V (D7 of High-Cut-Control-Byte).
1
The slew rate is measured with R
Discharge
= infinite and V
MPout
= 2.5V
Functional Description of the Multipath-Detector
Using the internal Multipath-Detector the audible effects of a multipath condition can be minimized. A mul-
tipath-condition is detected by rectifying the 19kHz spectrum in the fieldstrength signal. An external ca-
pacitor is used to define the attack- and decay-times (see block diagram, fig. 23). The MP_OUT-pin is
used as detector-output connected to a capacitor of about 47nF and additionally the MP_IN-pin is selected
to be the fieldstrength input. Using this configuration an external adaptation to the user's requirement is
possible without affecting the "normal" fieldstrength input (LEVEL) for the stereo decoder. This application
is given in fig. 29.
To keep the old value of the Multipath Detector during an AF-jump, the MP-Hold switch can disconnect
the external capacitor. This switch is controlled directly by the AFS-Pin.
Selecting the "internal influence" in the configuration byte the channel separation is automatically reduced
during a multipath condition according to the voltage appearing at the MP_OUT-pin. A possible application
is shown in fig. 29.
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PDF描述 |
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| TDA7412 | CARRADIO SIGNAL PROCESSOR |
| TDA7415CB | Car radio multimedia signal processor |
| TDA7416 | CARRADIO SIGNAL PROCESSOR |
| TDA7417 | Car radio audio processor |
| TDA7417TR | Car radio audio processor |
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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