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參數資料
| 型號： | SAA4979H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Sample rate converter with embedded high quality dynamic noise reduction and expansion port |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP128 |
| 封裝： | 28 X 28 X 3.40 MM, PLASTIC, QFP-128 |
| 文件頁數： | 18/52頁 |
| 文件大?。?/td> | 224K |
| 代理商： | SAA4979H |
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2002 May 28
18
Philips Semiconductors
Product specification
Sample rate converter with embedded high quality
dynamic noise reduction and expansion port
SAA4979H
7.3.7
P
OST PROCESSING
Blanking is done just before the digital-to-analog
conversion by switching Y to a fixed black value and UV to
a colourless value. The blanking window is defined by the
control inputs: bln_hstart, bln_hstop, bln_vstart and
bln_vstop.
Side panels are generated by switching the Y, U and V to
defined values within a horizontal window (control inputs:
sidepanel_hstart and sidepanel_hstop); the 8 MSBs of Y
and the 4 MSBs of U and V are programmable (control
inputs: sidepanel_y, sidepanel_u and sidepanel_v).
Framing e.g. for picture-in-picture mode, can be achieved
by another programmable window (control inputs:
PIP_frame_hstart, PIP_frame_hstop, PIP_frame_vstart
and PIP_frame_vstop). The vertical and horizontal frame
width can be programmed from 1 up to 15 pixels (control
inputs:PIP_frame_heigthandPIP_frame_width). Framing
uses the same colour and luminance values as the side
panels.
The range of the Y output signal can be chosen between
9 and 10 bits (control input: output_range). In the event of
9 bits for the nominal signal there is room left for under and
overshoot, adding up to a total of 10 bits. In the event of
selecting all 10 bits of the luminance digital-to-analog
converter for the nominal signal any under or overshoot
will be clipped (see Fig.6).
The Y samples can be shifted onto 16 positions with
respect to the UV samples (control input: y_delay). The
zero delay setting is suitable for the nominal case of
aligned input data. The other settings provide eight
samples with less delay to seven samples with more delay
in Y.
7.4
Triple 10-bit digital-to-analog conversion
Three identical 10-bit converters are used to map the
4 : 4 : 4 YUV data to analog levels with a 32 MHz data
rate. The polarity of the colour difference signals U and V
is switchable by the control bit uv_inv_out. The output
ranges are illustrated in Figs 6 and 7 respectively.
handbook, full pagewidth
MHC191
0
(16) 288
(0) 256
1023
(235) 727
1.0 V (p-p)
1.0 V (p-p)
(0) 0
(16) 64
VOY
+
1.095 V
VOY
+
1.0 V
VOY
0.073 V
VOY
VOY
+
1.674 V
VOY
0.656 V
VOY
+
1.0 V
VOY
(235) 940
(255) 766
black
white
black
white
Fig.6 Luminance output levels.
a. Output range = 1.
b. Output range = 0.
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