SAA7199BWP PHILIPS [NXP Semiconductors], SAA7199BWP Datasheet - Page 24

• Manufacturer Part Number: SAA7199BWP
• Description: Digital Video Encoder DENC GENLOCK-capable
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Accuracy of matrix
Evaluation of quantization errors.
The RGB to YUV matrix is achieved in accordance with
the following algorithm:
Errors can occur in the calculation of Y, which as a result
influence the U and V outputs. The greatest positive error
occurs, if in all of the three for Y calculation used ROMs the
values are rounded up to 0.5 LSB, and no truncation error
of 0.5 LSB is generated after summation:
The greatest negative error occurs at rounding off in all the
three ROMs and by consecutive truncation:
As a result, the matrix error can be 1 digit, which
corresponds to approximately 0.5% differential
non-linearity.
Estimation of noise by quantization
The sum of all sqared quantization errors is SS normalized
to 220
Compared with noise energy for ideal quantization,
SSI =
matrix of:
If SS is the sum of all squared quantization errors,
normalized to 220 input combinations of a grey-scale
(R = G = B), then:
Compared with noise energy for ideal quantization,
SSI =
matrix of:
1996 Sep 27
Y = INT
[(NINT(R
U = NINT [(B
V = NINT [(R
with truncation “error”:
SS = 0.187545 LSB
D = 10 log (0.187545
SS = 0.12273 LSB
D = 10 log (0.12273
Digital Video Encoder (DENC)
GENLOCK-capable
3
3
3
2
0.5 LSB
-------------------- -
0.5 LSB
-------------------- -
–
----------------------- -
1
1
3
0.5 LSB
12
12
input combinations (3-dimensional colour scale).
0.114) / 2]
LSB
LSB
2
2
2
2
2
2
results in a deterioration by the conversion
results in a deterioration by the conversion
= +0.75 LSB;
0.5 LSB = +0.25 LSB.
0.299) + NINT(G
Y)
Y)
0.5 LSB = 1.25 LSB.
2
.
2
0.57722]
0.72955].
.
12) = 1.7 dB (equals 0.25 bit).
12) = 3.5 dB (equals 0.5 bit).
2
0.587) + NINT(B
24
Normalizing amplifiers in the luminance channel
The absolute amplification error for 50 Hz non-set-up
signals is 0.375%; differential non-linearity is 0.333%
(equals 1 LSB).
The absolute amplification error for 60 Hz set-up signals is
(equals 1 LSB).
Normalizing amplifiers in the chrominance channel
The absolute amplification error is approximately 0.5%
with a truncation error of 0.5 LSB.
The subcarrier amplitude for standards with luminance
set-up is the same as for the standards without luminance
set-up.
Modulator
The absolute amplification error is 0.39%; there is no
truncation error.
Functional timing (see Fig.10)
GENLOCK
The encoded signal can be generated earlier with respect
to CVBS7 to CVBS0 bits (offset t
index 05). The HSN output signal can be generated early
by PSO-bits (index 07) with respect to CB to compensate
for pipelining delay t
stand alone mode).
The horizontal timing is independent of active video at data
inputs PDn(7 to 0). The line blanking period on the outputs
is set to approximately 12 s in 50 Hz standards (11 s in
60 Hz standards).
S
HSN pin is used as an input. The active edge of the input
signal is assumed to fit to the incoming CB signal.
Deviations can be compensated in the range of the
GCD-bits (index 05).
The t
CVBS output; it is 55 pixel clock periods long (PIXCLK)
plus the propagation delay of the LDV input register
regardless of mode and colour standard.
The key input signal is delay compensated with respect to
PDn(7 to 0) data input. The generated vertical field and
burst blanking sequences are shown in Fig.11 (50 Hz
PAL) and Fig.12 (60 Hz NTSC).
1.5%; differential non-linearity is 0.365%
LAVE MODE
enc
time is the total delay from data input to analog
MODE
Rint
of the RAM interface (valid also in
ofs
set by GDC-bits;
Product specification
SAA7199B