STREAM Labs
Stream Logo SDI v2.0 2
USER’S MANUAL
Phillips Trimedia video processor allow to extend the Stream Logo SDI functionality by
improving inner algorithms, without any hardware changes. Stream Logo SDI allows to
compress files inside the system, in order to provide a more economical storage.
Phillips Trimedia computing power can be used, for instance, to make the hands of a
clock inside the Stream Logo SDI move, by a simple specification of appearance of the
hands and the background (which can also be dynamic).
External files are uploaded to the in-built nonvolatile hard disk via the network.
Each point has a 32-bit representation: 24 bits are used to represent the dot’s color (16
million hues); the remaining 8 bits specify one of the 256 transparency degrees (alpha-
channel). Although the point color component has in the computer graphics a 24 bit
representation (8×8×8), a 30 bit representation (10×10×10) is used for mixing, i.e. if a
10 bit input signal was used, it remains this way after the mixing.
Stream Logo SDI can run in pass-through or mixing operation modes. For mixer
operation, and alpha-channel (DSK) is provided in digital and analog formats. Positive
or negative key signal delay can be set within a broad diapason with regard to the
produced graphics. The entire production of the superposed logo is carried out digitally.
Transformation of signal formats
In addition to the serial digital input, the Stream LOGO SDI card has analog
inputs: YUV/RGB, S-Video, and Composite. Independently of the input signal type, the
card allows to form analog output signals (YUV/RGB, or S-Video and Composite )
simultaneously with the SDI signal. PAL, SECAM, and NTSC, inputs are allowed; PAL
or NTSC only can be set as output standards. The frame frequency is constant, which
means that an NTSC signal can only be transformed to, or produced from, another
NTSC signal. The distinctive feature of the input decoder is the 9 bit treatment and the
separation of brightness and color saturation in composite PAL, SECAM, and NTSC
using the adaptive ‘color combine filter’. It does not reduce the brightness channel
bandwidth. The 9-bit treatment allows to keep at the digitization all 256 brightness
grades, as compared to the 160-170 possible to keep with the 8-bit treatment.
A 10-bit digital-to-analog converter with a four-fold oversampling is used to form
the analog output signals. It allows to ensure a full high-frequency noise filtration of
output signals without reducing the bandwidth of their brightness channel.
Stream Logo SDI Control
Stream Logo SDI can be controlled with the front panel buttons, which allow to
change the logo position and the logo itself. Other functions are controlled using a
dedicated program run on an external computer. It allows to specify the logos output
