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| 型号： | TDA9178/N1 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP24 |
| 封装： | 0.400 INCH, PLASTIC, SOT-234, SDIP-24 |
| 文件页数： | 31/39页 |
| 文件大小： | 302K |
| 代理商： | TDA9178/N1 |
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TDA9178
Information as of 2000-08-23
TDA9178; YUV one chip picture improvement based on luminance vector-, colour vector- and spectral processor
The TDA9178 is a transparent analog video processor with YUV input and output interfaces. It offers three main functions: luminance
vector processing, colour vector processing and spectral processing. Beside these three main functions, there are some additional
functions.
In the luminance vector processor, the luminance transfer function is controlled in a non-linear way by the distribution, in 5 discrete
histogram sections, of the luminance values measured in a picture. As a result, the contrast ratio of the most important parts of the scene
will be improved. Black restoration is available in the event of a set-up in the luminance signal.
A variable gamma function, after the histogram conversion, offers the possibilities of alternative brightness control or factory adjustment of
the picture tube.
The adaptive black stretch function of the TDA9178 offers the possibility of having a larger ‘weight’ for the black parts of the video signal;
the white stretch function offers an additional overall gain for increased light production.
To maintain a proper colour reproduction, the saturation of the U- and V-colour difference signals is also controlled as a function of the
actual non-linearity in the luminance channel.
In the colour vector processor, the dynamic skin tone correction locally changes the hue of colours that match skin tones to the correct hue.
The green enhancement circuit activates medium saturated green towards to more saturated green. The blue stretch circuit can be
activated which shifts colours near white towards blue.
The spectral processor provides 1D luminance transient improvement, luminance detail enhancement by smart peaking and a 1 D colour
transient improvement. The TDA9178 can be used as a cost effective alternative to (but also in combination with) scan velocity modulation.
In the spectral processor line width control (or aperture control) can be user defined. The TDA9178 is capable of adjusting the amount of
coring according to the video level with the video dependent coring. The TDA9178 is also capable to give extra sharpness in the cases of
saturated red and magenta parts of the screen using the colour dependent sharpness feature.
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Description
相关PDF资料 |
PDF描述 |
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| TDA9178N | SPECIALTY CONSUMER CIRCUIT, PDIP24 |
| TDA9178T/N1 | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| TDA9178/N1,112 | SPECIALTY CONSUMER CIRCUIT, PDIP24 |
| TA8615N | SPECIALTY CONSUMER CIRCUIT, PDIP30 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA9178T | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:YUV one chip picture improvement based on luminance vector-, colour vector- and spectral processor |
| TDA9181 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Integrated multistandard comb filter |
| TDA9181P | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Integrated multistandard comb filter |
| TDA9181T | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Integrated multistandard comb filter |
| TDA9183 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Integrated NTSC comb filter |
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