TI公司的TVP5158,TVP5157和TVP5156是四路高質(zhì)量NTSC/PAL視頻譯碼器,能把所有流行的基帶模擬視頻格式數(shù)字化和譯碼成數(shù)字視頻輸出.譯碼器每路包括10位27MSPSADC,復合輸入信號以2xITU-RBT.601時鐘頻率取樣,行頻鎖定對準,抽取1x象素速率.CVBS譯碼采用5行適應(yīng)梳狀濾波器,用于亮度和色度數(shù)據(jù)通路,以降低交叉干擾.所有四路是獨立工作的,主要用于安全/監(jiān)視數(shù)字視頻錄音/服務(wù)器和PCI產(chǎn)品,汽車娛樂設(shè)備視頻集線器,游戲系統(tǒng)和大型視頻墻顯示器
TI公司的TVP5158, TVP5157和TVP5156是四路高質(zhì)量NTSC/
PAL視頻譯碼器,能把所有流行的基帶模擬視頻格式數(shù)字化和譯碼成數(shù)字視頻輸出.譯碼器每路包括
10位27MSPS
ADC,復合輸入信號以2x ITU-R
BT.601時鐘頻率取樣, 行頻鎖定對準,抽取1x象素速率. CVBS譯碼采用5行適應(yīng)梳狀
濾波器,用于亮度和色度數(shù)據(jù)通路,以降低交叉干擾.所有四路是獨立工作的,主要用于安全/監(jiān)視數(shù)字視頻錄音/服務(wù)器和
PCI產(chǎn)品,汽車娛樂設(shè)備視頻集線器,游戲系統(tǒng)和大型視頻墻顯示器.本文介紹了TVP5158, TVP5157和TVP5156主要特性, 音頻子系統(tǒng)功能方框圖以及諸如
16路CIF記錄和多路CIF預(yù)覽等
多種TVP5158級聯(lián)連接框圖, 視頻和音像輸入連接圖.
The TVP5158, TVP5157, and TVP5156 devices are 4-channel, high-quality NTSC/PAL video decoder that digitizes and decodes all popular b
ase-band analog video formats into digital video output. Each channel of this decoder includes 10-bit 27-MSPS A/D c
onverter (ADC). Preceding each ADC in the device, the corresponding analog channel contains an analog circuit that clamps the input to a reference voltage and applies the gain.
Composite input signal is sampled at 2× the ITU-R BT.601 clock frequency, line-locked alignment, and is then decimated to the 1× pixel rate. CVBS decoding uses five-line adaptive comb filtering for both the luma and chroma data paths to reduce both cross-luma and cross-chroma artifacts. A chroma trap filter is also available. On CVBS inputs, the user can control video characteristics such as contrast, brightness, saturation, and hue via an I
2C host port interface. Furthermore, luma peaking (sharpness) with programmable gain is included.
All 4 channels are independently controllable. These decoders share a single clock input for all channels and for all supported standards.
TVP5158 provides a glueless audio and video interface to TI DaVinci™ video processors. Video output ports support 8-bit ITU-R BT.656 and 16-bit 4:2:2 YUV with embedded synchronization. TVP5158 supports multiplexed pixel-interleaved and line-interleaved mode video outputs with metadata insertion. TVP5158 and TVP5157 integrate 4-Ch audio ADCs to reduce the BOM cost for surveillance market. Multiple TVP5158 devices can be cascade connected to support up to 8-Ch Video or 16-Ch audio processing.
Noise reduction and auto contrast functions improve the video quality under low light condition which is very critical for surveillance products.
The TVP5158, TVP5157, and TVP5156 can be programmed by using a single I
2C serial interface. I
2C commands can be sent to one or more de
