Sensoray 4011 Hardware Manual - page 4
Introduction
Model 4011 is a compact digital video recorder (DVR) designed for embedded OEM
applications. It records audio and video (A/V) to USB storage media and can capture
JPEG images on-the-fly without interrupting recording. Its outputs allow live video,
recorded A/V or JPEG snapshots to be displayed on an external monitor. Date and time
are maintained by a real-time clock with battery backup. To implement a complete DVR
simply connect power, your own custom keypad and a USB storage device.
Videos and
snapshots are saved to the
DCIM
directory, which is created if not present.
The board encodes standard NTSC/PAL composite video using efficient H.264
compression. Audio from the onboard microphone is digitized and compressed using
AAC encoding. The compressed A/V streams are multiplexed and recorded as MP4
files on a user-supplied USB storage device, with file names automatically generated by
the real-time clock. Bit rates can be tailored to match application requirements and
storage capacity.
Text overlays reflecting current date and time can be applied to appear in the recorded
video and preview.
An external USB storage device is required for DVR operation. If desired, a second USB
storage device may also be connected and the 4011 will simultaneously record to both
devices. A common application for this is recording to a removable device while
creating an archival copy on a non-removable device. USB connectors are located on
both sides of the board to facilitate connection to both removable and embedded
storage devices.
The DVR user interface supports a user-supplied keypad working in conjunction with
the board's flexible on-screen menu system. Each keypad connector pin can be routed
directly to any keypad switch and configured to match the control scheme of your
custom keypad. If preferred, a standard keyboard can be plugged into any USB port
and used to control the DVR.
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