參數(shù)資料
型號(hào)： SAA7134HL
廠商： NXP Semiconductors N.V.
元件分類： 通用總線功能
英文描述： PCI audio and video broadcast decoder
文件頁(yè)數(shù)： 28/51頁(yè)
文件大?。?/td> 233K
代理商： SAA7134HL
SAA7134HL_4
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 04 — 31 March 2006
28 of 51
Philips Semiconductors
SAA7134HL
PCI audio and video broadcast decoder
6.6.7
VBI data
The Vertical Blanking Interval (VBI) is often utilized to transport data over analog video
broadcast. Such data can closely relate to the actual video stream, or just be general data
(e.g. news). Some examples for VBI data types are:
Closed Caption (CC) for the hearing impaired (CC, on line 21 of first field)
Intercast data in US coded in North-American Broadcast Text System (NABTS)
format, in Europe in World Standard Teletext (WST), to transmit internet related
services, optionally associated with actual video program content
Teletext, transporting news services and broadcast related information, Electronic
Program Guide (EPG), widely used in Europe (coded in WST format)
EPG, broadcaster specific program and schedule information, sometimes with
proprietary coding scheme (pay service), usually carried on NABTS, WST, Video
Programming Service (VPS), or proprietary data coding format
Video Time Codes (VTC) as inserted in camcorders e.g. use for video editing
Copy Guard Management System (CGMS) codes, to indicate copy protected video
material, sometimes combined with format information, Wide Screen Signalling
(WSS)
This information is coded in the unused lines of the vertical blanking interval, between the
vertical sync pulse and the active visible video picture. So-called full-field data
transmission is also possible, utilizing all video lines for data coding.
The SAA7134HL supports capture of VBI data by the definition of a VBI region to be
captured as raw VBI samples, that will be sliced and decoded by software on the host
CPU. The raw sample stream is taken directly from the ADC and is not processed or
filtered by the video decoder. The sampling rate of raw VBI can be adjusted to the needs
of the data slicing software.
6.6.8
Signal levels and color space
Analog TV video signals are decoded into its components luminance and color difference
signals (YUV) or in its digital form Y-C
B
-C
R
. ITU-R BT601defines 720 pixels along the line
(corresponding to a sampling rate of 27 MHz divided by two), and a certain relationship
from level to number range; see
Figure 11
.
The video components do not use the entire number range, but leave some margin for
overshoots and intermediate values during processing. For the raw VBI samples there is
no official specification how to code, but it is common practice to reserve the lower quarter
of the number range for the sync, and to leave some room for overmodulation beyond the
nominal white amplitude; see
Table 12
.
The automatic clamp and gain control at the video input, together with the automatic
chroma gain control of the SAA7134HL, ensures that the video components stream at the
output comply to the standard levels. Beyond that additional brightness, contrast,
saturation and hue control can be applied to satisfy special needs of a given application.
The raw VBI samples can be adjusted independent of the active video.
The SAA7134HL incorporates the YUV-to-RGB matrix (optional), the RGB-to-YUV matrix
and a three channel look-up table in between; see
Figure 13
. Under nominal settings, the
RGB space will use the same number range as defined by the ITU and shown in
Figure 11
for luminance, between 16 and 235. As graphic related applications are based
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7134HL/V1,518 功能描述:視頻 IC PCI 9-BIT VID/STEREO RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAA7134HL/V1,557 功能描述:視頻 IC PCI 9-BIT VID/STEREO RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAA7134HLBE 功能描述:視頻 IC PCI 9-BIT VID/STEREO DECODER RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAA7134HLBE-T 功能描述:視頻 IC PCI 9-BIT VID/STEREO DECODER RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAA7135 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip, analog TV video/stereo DECODER
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