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| 型號： | DMA2271 |
| 英文描述： | Consumer IC |
| 中文描述： | 消費(fèi)性IC |
| 文件頁數(shù)： | 22/36頁 |
| 文件大小： | 496K |
| 代理商： | DMA2271 |
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DMA 2271, DMA 2280, DMA 2281
22
3.2.2. The Luminance Interpolating Filter
An interpolation from 13.5 MHz to 20.25 MHz is per-
formed in order to overcome the need for a second sys-
tem clock of 13.5 MHz and to simplify the reconstruction
filters placed after the D/A conversion (RGB outputs of
the VCU). The interpolation filter has a linear phase and
can be switched to broad or narrow bandwidth by means
of the CCU via the IM bus (bits 10 and 11, address 201).
The different frequency responses are shown in Fig.
2–20 and in Table 2–1.
3.2.3. The Contrast Multiplier
After the luminance interpolating filter is a contrast multi-
plier. The contrast setting is controlled by the CCU via
the IM bus (bits 10 to 15, address 200), depending on the
user’s instruction. From the contrast multiplier, the digi-
tal luminance signal is fed back to the VCU 2133 in the
form of an 8–bit signal. In the VCU, this signal is con-
verted from digital to analog and fed to the RGB matrix.
The setting range of the contrast multiplier comprises 6
bits (64 steps). If the product at the multiplier’s output is
higher than the working range, the largest possible num-
ber is output.
3.2.4. The Chrominance Store
The chrominance store contains the color information
for 3 lines. It is used for time expansion and line interpo-
lation. The input frequency is 20.25 MHz, the output fre-
quency 6.75 MHz.
3.2.5. The Line Interpolating Filter
The color difference signals are transmitted within alter-
nate lines as U and V. A “1, 2, 1” post–filter required to
interpolate the color difference information is implem-
ented. The action of the filter is for even lines:
U = U
n
, V =
V
n–1
+ V
n +1
2
and for odd lines:
U =
U
n–1
+ U
n +1
2
, V = V
n
3.2.6. The Chrominance Interpolating Filter
After the line interpolating filter the 8–bit color difference
signals U and V are routed to the chroma interpolating
filter which has linear phase and can be switched to dif-
ferent frequency responses via the IM bus (Fig.
NO TAG, Table 2–2) using bits 13 to 15 in address 201.
This filter is used for conversion of the sample rate from
6.75 MHz up to 10.125 MHz.
3.2.7. The Color Saturation Multiplier
The digital color difference signals U and V are routed to
a color saturation multiplier, whose setting is also con-
trolled by the CCU via the IM bus (address 23). The
range of the multiplier comprises 6 bits, with each color
difference signal being set independently.
The PAL matrix in the VCU requires a compensation fac-
tor of 0.71. This means that the color saturation factor for
(B – Y) is equal to 0.71 the color saturation factor for
(R – Y). Both factors are calculated in the CCU.
3.2.8. The Color Multiplexer
The color difference signals are transferred back to the
VCU 2133 in multiplex via a 4–line bus. Demultiplexing
takes place in the VCU. The digital signals are then re-
converted to analog. Subsequently they are dematrixed
in the RGB matrix together with the Y signal, giving the
RGB signals which drive the output amplifiers of the
VCU 2133 Video Codec.
The color multiplexer can drive a 4–line bus with an ef-
fective sample rate of 5.6025 MHz for each color differ-
ence signal or an 8–line bus with a sample rate of 10.125
MHz. This function is controlled by the IM bus (Table
4–1), using bit 6 in address 201.
3.3. Sound/Data Processing
This section begins with a descrambler and de–inter-
leaver. The descrambler uses the same pseudo–ran-
dom binary sequence (PRBS) generator as is used for
the scrambling process. Its clock rate is 10.125 MHz or
20.25 MHz. The de–interleaver corrects the succession
of the transmitted packet bits which are interleaved in or-
der to minimize the effect of multiple bit errors.
Table 3–1:
Transmission Order
1
2
93
94
95
96
187
188
189
190
...
...
...
281
282
283
284
375
376
377
378
469
470
471
472
...
...
...
563
564
565
566
657
658
659
660
751
(1)
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