A Scaler/doubler takes a standard non HD 480i/p signal (DVD,Satellite or digital cable box and "upconvert" the signal to 720p or 1080i. Which fills in the extra lines on your HD television and give you a much more complete picture.
For a complete explanation of a scaler/doubler
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HD Hanna HDTV tuner scales up to 1080p

HD Hanna Scaler ATSC Tuner with Firewire. The new HD Hanna hits the "sweet spot" for the high-performance home theater by providing HD "Set Top Box" and scaling functionality in one product, with high quality, versatility, and value. Pristine picture quality is afforded by the True Digital Path and renowned scaler equipped with the advanced, motion-assisted de-interlacing algorithm "Clear Matrix Pro". For those applications demanding 3-D comb filtering, DVI-D inputs, and HD scaling, HD Hanna supports it via an optional daughter board card. Custom Installers and Home Theater buffs will be delighted with HD Hanna, because it offers so much value all in one economical unit, including:

Key Features

• Video decoding (including ATSC and NTSC).
• High-quality scaling to SD and HD resolutions.
• Flexible I/O with all world formats accepted in composite and S-Video, and HD RGBHV and DVI/HDCP out.
• Two IEEE 1394 Firewire I/O ports with 5C, capable of HDTV and SDTV
• Has user-friendly on-screen-display, and a programmable IR remote with hot buttons to simplify set-up and make playback of all DTV signals easy to manage.
• Works with all control systems (like Crestron).
• Customers can upgrade firmware over the Internet.
• It is rack-mountable, has no fan noise, and is easy to install and integrate.
• Simultaneous HD and SD outputs from any source.
  
  Inputs
• Flexible inputs supported:
• two RF tuner inputs (both capable of ATSC and analog TV)
• two Component Video (YPrPb) 
• one RGBHV pass-through
• two Composite Video (CV)
• two S-Video
• RF inputs accept ATSC and analog TV (NTSC, PAL, PAL-M, SECAM) formats
• Two IEEE 1394 Firewire I/O ports supporting HDTV/5C and SDTV
• Four analog (standard line-type Left & Right pairs) Audio inputs
  
  Scaling and Processing
• Scaling SDTV and HDTV to popular native resolutions, like720x480i, 720x480p, 1920x1080i/1080p
• 1280x720p, and 1280x768p
• Scaler equipped with advanced, motion-assisted de-interlacing algorithm "Clear Matrix Pro"
• Aspect Ratios in and out: 16:9 and 4:3
• HDTV and SDTV Colorimetry Matrix
• 3-D Comb Filtering for Composite
  
  Video Outputs
• Flexible video outputs supported:
• one HD Component Video (YPrPb)
• one HD RGBHV
• one DVI with HDCP
• one SD Composite Video
• Two IEEE 1394 5C-enabled Firewire I/O ports supporting HDTV and SDTV
• Supports output formats of 1080 interlaced and progressive 720 and 768 progressive, and 480
• interlaced and progressive
• Simultaneous HD and SD outputs from any source
• 60 Hz output refresh rate
• Both SD (480i) out and HD out simultaneously for each output resolution
  Audio:
• one analog (standard line-type Left & Right pairs) output
• one digital PCM output
• Toshlink optical audio output
  
  Control

• infrared Remote Control with "hot" buttons; discrete IR commands available
• User-friendly on-screen-display
• LCD display on front panel
• Picture adjustments include: brightness, contrast, saturation, and hue
• Each audio input can be matched to any video source via the menu
• RS232 port equipped with discrete command protocol compatible with control systems (e.g.,
• Crestron, AMX, CNMSX-PRO)
• Firmware-upgradeable Mechanical
• Easy to install and integrate -- Custom Installers dream
• Rack mountable: 2U (brackets included)
• No fan noise
• F-type, BNC, Firewire, DB15, and S-Video connectors for inputs; and BNC, Firewire, and DVI-D
• connectors for outputs
• Size: 17" x 10" x 3.5"
• Weight: 10 lbs.
• Enclosure type: Metal
• Input Power: 100 to 240V AC, 1 A

Product Specifications  Input Connections 2 F-Type (ATSC/NTSC) 2 Component (3xRCA) Y-Pb-Pr  1 VGA (pass-through) 2 S-Video Output Connections 1 DVI (HDCP) 1 RGBHV BNC  1 Component Y-Pb-Pr 2 Firewire 1 Toslink Optical Audio  1 Digital Coax Audio  1 Analog L+R Stereo Audio Resolutions 480i, 480p, 600p, 720p, 768p, 1024p, 1080i, 1080p Tuner Type ATSC digital TV and Analog NTSC  Dimensions 17" (W) x 10" (D) x 3.5" (H) Weight 10 lbs. (15 lbs. DIM Weight) Warranty Info One year parts and labor warranty