AK8853XQ Datasheet, PDF (25/70 Pages) Asahi Kasei Microsystems – NTSC/PAL/SECAM Digital Video Decoder

[AK8853XQ/ VN]
7.9 Y/C separation
The adaptive two-dimensional Y/C separation of the AK8853 utilizes a correlation detector to select the
best-correlated direction from among vertical, horizontal, and diagonal samples, and selects the
optimum Y/C separation mode. For NTSC-4.43, PAL-60, and SECAM inputs, the Y/C separation is
one-dimensional only, regardless of the setting.
YCSEP[1:0]-bits: Settings for Y/C separation method
YCSEP[1:0]-bits
Y/C separation mode
Notes
[00]
Adaptive
Selects [01] or [10] setting, as appropriate
[01]
1-D
1D (BPF)
[10]
2-D
NTSC-M, J, PAL-M: 3 Line 2-D
PAL-B, D, G, H, I, N, Nc: 5 Line 2-D
[11]
Reserved
—
For NTSC-4.43, PAL-60, and SECAM inputs, Y/C separation is 1-D only, regardless of the setting.
7.10 C filter
The bandwidth of the C filter can be set via the register, as follows.
C358FIL[1:0]: Settings for C filter bandwidth, for input signal with 3.58 MHz subcarrier wave
C358FIL[1:0] -bits
Notes
Notes
[00]
Narrow
[01]
Medium
[10]
Wide
NTSC-M, J, PAL-M, PAL-Nc
[11]
Reserved
C443FIL[1:0]: Settings for C filter bandwidth, for input signal with 4.43 MHz subcarrier wave
C443FIL[1:0] -bits
Notes
Notes
[00]
Narrow
[01]
[10]
Medium
Wide
PAL-B, D, G, H, I, N, NTSC-4.43, PAL-60
[11]
Reserved
Note. No bandwidth selection is possible for SECAM input.
7.11 UV filter
The UV bandwidth can be changed by switching between two low pass filter types for the demodulated
C signal.
UVFILSEL-bit: Settings for UV filter switching
UVFILSEL -bit
Bandwidth
[0]
Wide
[1]
Narrow
Notes
Rev-E-00
25
2008/01