Standard Definition Processor; Hdmi Receiver; Component Processor - Analog Devices ADV7850 Hardware Manual

2.2 STANDARD DEFINITION PROCESSOR

The standard definition processor (SDP) is capable of decoding a large selection of baseband video signals in composite and S-Video formats.
The video standards supported by the SDP include PAL, PAL 60, PAL M, PAL N, PAL Nc, NTSC M/J, NTSC 4.43, and SECAM. The
ADV7850 can automatically detect the video standard and process it accordingly.
The SDP has a 3D temporal comb filter and a 5-line adaptive 2D comb filter that gives superior chrominance and luminance separation
when decoding a composite video signal. This highly adaptive filter automatically adjusts its processing mode according to the video
standard and signal quality, with no user intervention required. A 1D notch filter can be used for poor quality inputs. The SDP has an IF
filter block that compensates for attenuation in the high frequency chroma spectrum due to a tuner saw filter. The SDP has specific lumi-
nance and chrominance parameter controls for brightness, contrast, saturation, and hue.
The ADV7850 implements a patented adaptive digital line length tracking (ADLLT) algorithm to track varying video line lengths from
sources such as a VCR. ADLLT enables the ADV7850 to track and decode poor quality video sources (such as VCRs) and noisy sources
(such as tuner outputs). Frame-based Timebase Correction (Frame TBC) ensures stable clock synchronization between the decoder and
the downstream devices.
The SDP also contains both a luma transient improvement (LTI) and a chroma transient improvement (CTI) processor. This processor
increases the edge rate on the luma and chroma transitions, resulting in a sharper video image. The SDP has a Rovi® detection circuit,
which allows Type I, Type II, and Type III Rovi protection levels. The decoder is also fully robust to all Rovi signal inputs.

2.3 HDMI RECEIVER

The HDMI receiver on the ADV7850 incorporates a fast switching feature that allows inactive ports to be authenticated for seamless
switching between encrypted HDMI sources. The ADV7850 incorporates XpressView™ fast switching on all HDMI input ports. Using the
ADI hardware-based HDCP engine that minimizes software overheads, XpressView technology allows fast switching between any HDMI
input ports in less than one second. The ADV7850 HDMI receiver provides active equalization of the HDMI data signals. This
equalization compensates for the high frequency losses inherent in HDMI and DVI cabling, especially at longer lengths and higher
frequencies. The equalizer is capable of equalizing for cable lengths up to 30 meters to achieve robust receiver performance at even high
HDMI data rates.
With the inclusion of HDCP, displays can receive encrypted video content. The HDMI interface of the ADV7850 allows for authentication
of a video receiver, decryption of encoded data at the receiver, and renewability of that authentication during transmission, as specified by
the HDCP v1.3 protocol for active and background HDMI ports.
Audio Return Channel is supported via the SPDIF interface. The four ports each contain a single-ended ARC transmitter. The ADV7850
also supports 3D Video, such as packing for all 3D formats up to a 3 GHz TMDS clock. The ADV7850 supports full colorimetry
including SYCC601, Adobe RGB, and Adobe YCC601.
The HDMI receiver offers advanced audio functionality. The receiver contains an audio mute controller, which can detect a variety of
conditions that could result in audible extraneous noise in the audio output. Upon detection of these conditions, the audio data can be
muted to prevent audio clicks or pops.

2.4 COMPONENT PROCESSOR

The CP section is capable of decoding a wide range of component video formats in any color space. Component video standards
supported by the CP are 525i, 625i, 525p, 625p, 720p, 1080i, 1080p, 1250i, VGA up to UXGA at 60 Hz, and many other standards.
The output section of the CP is connected to a TMDS output bus which can interface easily to a TMDS input or HDMI processor IC.
The CP section contains circuitry to enable the detection of Rovi encoded YPrPb signals for 525i, 625i, 525p, and 625p. It is designed to be
fully robust when decoding these types of signals.
VBI extraction of CGMS data is performed by the VDP section of the ADV7850 for interlaced, progressive, and high definition scanning
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ADV7850