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| 型号： | TDA7407 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封装： | 10 X 10 MM, 1.40 MM HEIGHT, LQFP-44 |
| 文件页数： | 25/46页 |
| 文件大小： | 692K |
| 代理商： | TDA7407 |
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TDA7407
Multipath detector
5.3
Automatic threshold control mechanism
5.3.1
Automatic threshold control by the stereoblend voltage
Besides the noise controlled threshold adjustment there is an additional possibility for
influencing the trigger 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. In some
cases the behaviour of the noiseblanker can be improved by increasing the threshold even
in a region of higher fieldstrength.
Sometimes a wrong triggering occures 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 D0 and D1 of
the fieldstrength control byte.
5.3.2
Over deviation detector
If the system is tuned to stations with a high deviation the noiseblanker can trigger on the
higher frequencies of the modulation. To avoid this wrong behaviour, which causes noise in
the output signal, the noiseblanker 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 D6 and D7 of the stereo decoder byte (the first step turns off the detector,
see fig. 18).
5.4
Functional description of the multipath detector
Using the internal multipath detector the audible effects of a multipath condition can be
minimized. A multipath condition is detected by rectifying the 19kHz spectrum in the
fieldstrength signal.An external capacitor is used to define the attack and decay times (see
block diagram Figure 24). the MPOUT pin is used as detector output connected to a
capacitor of about 47nF and additionally the MPIN pin is selected to be the fieldstrength
input.
Using the configuration, an external user requirement adaptation is given in Figure 24.
To keep the old value of the Multipath Detector during an AF-jump, the external capacitor
can be disconnected by the MP Hold switch. This switch can be 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 Figure 24.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7407_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Advanced car signal processor |
| TDA7407D | 功能描述:音频 DSP INFOTAINMENT SIGNAL 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 |
| TDA7407DTR | 功能描述:IC PROCESSOR ADV SIGNAL 44-LQFP RoHS:是 类别:集成电路 (IC) >> 线性 - 音频处理 系列:- 其它有关文件:STA321 View All Specifications 标准包装:1 系列:Sound Terminal™ 类型:音频处理器 应用:数字音频 安装类型:表面贴装 封装/外壳:64-LQFP 裸露焊盘 供应商设备封装:64-LQFP EP（10x10） 包装:Digi-Reel® 其它名称:497-11050-6 |
| TDA7407TR | 功能描述:处理器 - 专门应用 Advanced car signal processor RoHS:否 制造商:Freescale Semiconductor 类型:Multimedia Applications 核心:ARM Cortex A9 处理器系列:i.MX6 数据总线宽度:32 bit 最大时钟频率:1 GHz 指令/数据缓存: 数据 RAM 大小:128 KB 数据 ROM 大小: 工作电源电压: 最大工作温度:+ 95 C 安装风格:SMD/SMT 封装 / 箱体:MAPBGA-432 |
| TDA7409 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:CARRADIO-SIGNAL-PROCESSOR |
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