AK8857VQ Datasheet, PDF (57/105 Pages) Asahi Kasei Microsystems – Dual Channel Digital Video Decoder

[AK8857VQ]
Y/C separation
The adaptive two-dimensional Y/C separation of the AK8857 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]-bit : Settings for Y/C separation method
YCSEP[1:0]-bit Y/C separation mode
Notes
[00]
Adaptive
[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-Dç ç ç (*1)
[11]
Reserved
For NTSC-4.43, PAL-60, and SECAM inputs, Y/C separation is 1-D only, regardless of the setting.
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] -bit
C filter bandwidth setting
Notes
[00]
Narrow
[01]
Medium
NTSC-M, J, PAL-M, PAL-Nc
[10]
Wide
[11]
Reserved
MS1189-E-01
-57-
2010/12