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Specifications
1–2
SPG 422 Service Manual (B034000 and above)
The SPG 422 has a front-panel interface that controls all instrument functions.
Also, the user can control the SPG 422 via either a parallel ground-closure
remote or RS-232. The ground-closure remote provides simple control of a few
major instrument functions, while the RS-232 implementation is a SCPI
(Standard Commands for Programmable Instruments) command language
interface, with most of the front-panel interface capabilities. (Not all commands
are implemented to avoid operator traps.)
Characteristics Tables
Table 1–1: Encoding parameters for serial digital video outputs
Characteristics
Supplemental information
Standards Conformance
ITU-R BT.601 and ITU-R BT.656, SMPTE 125M, EBU Tech. 3267-E
Coded Signals
Luminance (Y), and color difference (C
r
and C
b
)
Number of Samples per Video Line
525/59.94
625/50
Luminance (Y)
858
864
Color Difference
(C
r
and C
b
)
429
432
Sampling Structure
Orthogonal: line, field, and frame repetitive. C
r
and C
b
samples are co-sited with odd
Y samples in each line.
Sampling Frequency
Luminance (Y)
13.5 MHz nominal
Color Difference (C
r
and C
b
)
6.75 MHz nominal
Signal Coding
Uniformly quantized PCM, 10 bits per sample, for each luminance and color-differ-
ence signal.
Number of Samples per Digital Active Line
525/59.94
625/50
Luminance (Y)
720
720
Color Difference (C
r
and C
b
)
360
360
Correspondence Between Video Signal Levels
and Quantization Levels
Luminance (Y)
877 quantization levels, with black level corresponding to level 64 and the peak white
level corresponding to level 940.
Color Difference (C
r
and C
b
)
897 quantization levels symmetrically distributed around level 512, which corresponds
to zero signal.
Summary of Contents for SPG 422
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