Sensoray 2253 - Manual (Page 5)

Introduction
Model 2253 is a compact USB compatible audio/video codec that is powered from a single
USB port. Its extremely small size and low power consumption make it ideal for both
portable and embedded applications.
Simplified 2253 block diagram
The board’s unique features, such as its ability to produce two concurrent output video
streams, open up a variety of possible applications. The streams can be any combination of
compressed and uncompressed. For compressed stream(s) the choice of H.264, MPEG-4
ASP, or MJPEG video compression types is available. Compression type, target bit rate
and resolution can be set independently for the two output streams. Note that there is a
bandwidth limitation in the case of two uncompressed streams; the maximum total data
bandwidth is limited to approximately that of one full-resolution YUV stream. Reducing
resolution, or color depth, or frame rate for one or both streams may be necessary to satisfy
this limit.
Model 2253 captures audio from its microphone or stereo line input. Output audio formats
are uncompressed PCM, G.711, or AAC.
The available output containers are mp4 for H.264, and AVI for MPEG-4 ASP and JPEG.
Elementary video and audio streams are available as well.
The board can perform as a decoder for all supported compression types. Note:
Audio/video decoding are not supported in model 2253 software versions 1.1.x. Please
contact Sensoray for details.
Up to 160 characters of overlay text may be positioned anywhere in the video frame prior
to compression.
3
Stereo Audio
Line In
Composite
NTSC/PAL
In
Image Resize
& Transform
Text/Graphic
Overlay
Compress
Mono Audio
MIC In
USB
Interface
TRS
BNC
USB
Text/Graphic
Overlay
Image Resize
& Transform
Text/Graphic
Overlay
Compress
TRS
Decompress
BNC
Low Latency Preview
Preview
Composite
NTSC/PAL
Out
Stereo Audio
Line Out
TRS
Galvanic
GPIN
Isolated
GPIN
TB
To Host
Computer
Text
Overlay
x
Isolated
GPOUT