Advanced 4-Channel A/V Decoder, MUX and Display Processor
The TW2851 is Techwell’s 5th generation 4-channel A/V decoder, multiplexer and display processor IC for security surveillance applications. The device has four built-in NTSC/PAL video decoders with high-performance adaptive 4H comb filters, noise reduction algorithm, independent and flexible video scalars for the display and record paths and 16x12 matrix motion/blind/night detectors. The device includes advanced record and display multiplexer functions.
Analog Video Decoder
– Accepts all NTSC(M/N/4.43)/PAL(B/D/G/H/I/K/L/M/N/60) standards with auto detection
– 8 analog CVBS inputs for pseudo 8 channel support
– Integrated analog anti-aliasing filters & 10-bit ADCs
– High performance adaptive 4H comb filters for all NTSC/PAL standards
– Proprietary fast video locking system for non-realtime application
– Noise reduction algorithm to remove impulse noise
– Independent & flexible video scalars for display, record and SPOT path
– Four built-in 16x12 matrix motion/blind/night detectors
Display
– Displays up to 32 windows on PC monitor or LCD panel
•H/V Scaling & Mirroring for Each Window
•Live & Playback Video Tiling on Same Display
– Last field/frame image captured when video loss detected
– Live or strobe capture for pseudo 8-ch mode
– Supports dual monitors: Main & Secondary
– Main Display (RGB/LVDS Interface)
• Up to WXGA+ resolution
• Built-in Video Scalar & 2D De-interlacer
• 7-Layer Graphic Overlay including Dual 16-bit Bitmap OSG Layers
– Secondary Display (CVBS Interface)
• Built-in Video Scalar & NTSC/PAL Encoder
• 5-Layer Graphic Overlay including Dual 16-bit Bitmap OSG Layers
– SPOT Display (CVBS Interface)
• Displays up to 16 channels of live camera
• 6-Layer Graphic Overlay including Dual16-bit Bitmap OSG Layers
Record
– Supports BT.656, BT.601 & BT.1120 formats
– Record Resolutions: Full D1, Half D1 and CIF
– Programmable Frame Rates: 1 to 30 fps Flexible Record Output Functions
• Real time & non-real time recording over 27/54MHz clock
• Field switching record modes support up to 120 fields per second
– Embedded Motion Detection & Channel ID Encoder
– 6-Layer Graphic Overlay with Independent 16-bit Bitmap OSG Window for Each Record
– Optional multiplexed digital video output for network function
Playback
– Flexible playback ports supporting BT.656, BT.601, BT.1120 & 24-bit RGB formats
– Supports up to 16-ch non-realtime playback
– Supports 4-ch D1 or 16-ch CIF realtime playback
– Auto cropping & strobe with channel ID decoder for multi-channel playback input
Other Features
– Integrated Audio Codec
– Single DDR SDRAM Memory Controller
– 8/16-bit Parallel Host Interface
– 8/12/16-channel Cascade Support
– 1.2V, 3.3V Supply
– Package: 352-PBGA, 27x27x2.23 mm
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