Tektronix TG700, Руководство пользователя, Страница: 308 / 343

HDLG7 HD Dual Link Video Generator
4:4:4 YCbCr Formats.
The HDLG7 module converts the input 4:2:2 YCbCr signal
to 4:4:4 YCbCr signal by up-interpolating the chroma channel data samples.
This is accomplished by using several incoming data samples before and after
the data samples to derive the extra sample point. If 10-bit sample structure is
selected, the alpha channel is set to blanking levels or is controlled by the ALPHA
CHANNEL DATA menu. If 12 bit is chosen, the addition 2 LSB bits are set to
zero on the Y and co-sited Cb and Cr samples. The derived Cb and Cr samples
will contain derived LSB bits.
4:4:4 RGB Formats.
The HDLG7 module converts the input 4:2:2 YCbCr signal
to 4:4:4 YCbCr as described above. Then the signal is color-space converted
using the inverse linear transform de
fi ned in SMPTE 274M. If 10-bit sample
structure is selected, the alpha channel is set to blanking levels or is controlled
by the ALPHA CHANNEL DATA menu. If 12 bit is chosen, the addition 2 bits
(LSB) are computed from the linear transform calculations.
4:2:2 YCbCr 12 Bit Formats.
The HDLG7 module converts the input 4:2:2 YCbCr
signal to 4:2:2 YCbCr 12 bits by setting zeros for the additional 2 bits (LSB). The
alpha channel is set to blanking levels or is controlled by the ALPHA CHANNEL
DATA menu.
4:4:4 XYZ Formats. The HDLG7 module converts the input 4:2:2 YCbCr signal
to 4:4:4 YCbCr and 4:4:4 RGB as described in the preceding paragraphs. Then
the RGB signal is converted to XYZ by normalizing the gamma corrected RGB
signal and applying the results to a RGB to XYZ color-space converter. The
output of the converter is gamma corrected for digital cinema. The XYZ mode
can be selected only in the 2K format mode.
Perform the following steps to select the converter mode:
1. Press the front-panel OTHER button. The menu display changes as follows:
2. Press the left ( ◄ ) or right ( ► ) arrow button, or press the OTHER button
repeatedly to select between Normal and Y to GBR .
Normal : The incoming YCbCr signal is converted to a normal dual-link
output.
Y to GBR : The incoming Y data is applied to the G, B, and R outputs.
This allows higher bandwidth data, such as multiburst or sweep to be
placed on all three channels. If the sampling structure is for a YCbCr or
XYZ output, the Y to GBR selection is not available.
3. Press the up ( ▲ ) or down ( ▼ ) arrow button to select Embedded Audio
selection menu. Then use the left ( ◄ ) or right ( ► ) arrow button to select
the following:
3–196 TG700 TV Signal Generator Platform User Manual