multimedia sound recording and video capture
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Multimedia: Sound recording and video capture. SOUND CAPTURE. Recording. Microphone Sound Card Software. VIDEO CAPTURE. Television Standards. B&W TV EIA - (Electronic Industry Association) originally defined the 525 line 30 frame per second, 1:2 interlace, two fields per video frame

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Presentation Transcript
  • Microphone
  • Sound Card
  • Software
television standards
Television Standards
  • B&W TV
    • EIA - (Electronic Industry Association) originally defined the 525 line 30 frame per second, 1:2 interlace, two fields per video frame
    • CCIR standards body that originally defined the 625 line 25 frames per second
  • Color TV
    • NTSC - National Television Standards Committee
    • PAL - Phase Alternating Line
    • SECAM - Système Électronique pour Couleur avec Mémoire
television standards1
Television Standards

Pal/Secam – Better colors/Better picture/More Flicker

  • Brain
    • If you divide a still image into a collection of small colored dots, your brain will reassemble the dots into a meaningful image,
    • If you divide a moving scene into a sequence of still pictures and show the still images in rapid succession, the brain will reassemble the still images into a single moving scene.
  • The Cathode Ray Tube (CRT)
    • the "cathode" is a heated filament
    • The heated filament is in a vacuum created inside a glass "tube."
    • The "ray" is a stream of electrons that naturally pour off a heated cathode into the vacuum.
    • the stream of electrons is focused by a focusing anode into a tight beam and then accelerated by an accelerating anode.
    • hits the flat screen at the other end of the tube which is coated with phosphor, which glows when struck by the beam.
television b w

480 Lines visible

525 lines transmitted

Television (B&W)
  • In a black-and-white TV, the screen is coated with white phosphor and the electron beam "paints" an image onto the screen by moving the electron beam across the phosphor a line at a time.
  • "raster scan" pattern
  • 480 lines visible from top to bottom
  • Aspect ratio: 4:3 equivalent to 640 x 480 (VGA) interlaced, 320x240 non-interlaced.
  • interlacing technique:
    • the screen is painted 60 times per second but only half of the lines are painted per frame. The beam paints every other line as it moves down the screen -- for example, every odd-numbered line. Then, the next time it moves down the screen it paints the even-numbered lines, alternating back and forth between even-numbered and odd-numbered lines on each pass. The entire screen, in two passes, is painted 30 times every second.
  • progressive scanning (digital video cameras):
    • paints every line on the screen 60 times per second.
television color
Television (Color)
  • A color TV screen differs from a B&W screen in three ways:
    • There are three electron beams that move simultaneously across the screen. They are named the red, green and blue beams.
    • the screen is coated with red, green and blue phosphors arranged in dots or stripes.
    • very close to the phosphor coating, there is a thin metal screen called a shadow mask. This mask is perforated with very small holes that are aligned with the phosphor dots (or stripes) on the screen.
television hdtv dtv
Television (HDTV, DTV)
  • Supports:
    • 480p - 640x480 pixels progressive
    • 720p - 1280x720 pixels progressive
    • 1080i - 1920x1080 pixels interlaced
    • 1080p - 1920x1080 pixels progressive
  • uses MPEG-2 encoding
television hdtv
Television (HDTV)
  • 210,000 pixels vs. 2 million pixels
  • 10 x more picture detail
  • Better Sound (AC-3, Dolby Digital)
  • The CRT and electronics in a monitor are much more precise than is required in a TV
  • a lot more pixels and has a much crisper display
coaxial cable
Coaxial cable
  • Coaxial cabling is the primary type of cabling used by the cable television industry,
  • can carry information for a great distance,
  • multiple signals,
  • includes one physical channel - supplies both video and monaural audio signals on the same line,
  • altered by modulation to higher frequency.
audio video cables composite
Audio/Video Cables (Composite)
  • Provide better video picture quality and add stereo sound compatibility,
  • combines the three basic elements of a video picture (color, brightness, and synchronization data) into a single combined ("composite") signal.
  • video signal has not yet been altered by modulation
  • Commonly used.
s video cable
S-Video Cable
  • Allows portions of the video signal to be processed separately, resulting in sharper images with finer detail,
  • splits the video signal to two parts (luminance and color),
  • need to connect an audio cable.
component video cable
Component video Cable
  • High-end DVD players, satellite receivers and HDTV’s utilize Component Video,
  • need to connect an audio cable,
  • splits the video signal up into three separate components (Y/Pb/Pr) for preserving high resolution and accurate color rendition.
  • can provide the highest quality pictures available today, with bright crisp colors and excellent fine picture detail.
  • RGBHV (15 pin High Density D-Type connector ) (VGA)
  • IEEE 1394, i.Link, Lynx
  • fast external bus standard,
  • data transfer rates of up to 400Mbps (in 1394a) and 800Mbps (in 1394b),
  • can be used to connect up 63 external devices,
  • supports both Plug-and-Play and hot plugging,
  • provides power to peripheral devices,
  • FireWire cables can run as long as 4.5 meters,
  • ideal for devices that need to transfer high levels of data in real-time, such as video devices.
usb universal serial bus
USB (Universal Serial Bus )
  • External bus standard,
  • maximum data rate of 12 Mbps,
  • connect up to 127 devices,
  • supports both Plug-and-Play and hot plugging,
  • provides power to peripheral devices
  • cables can run as long as 5 meters; with hubs, devices can be up to 30 meters (six cables\' worth),
  • the USB 2.0 20x faster than USB 1.1
camcorders analog
  • VHS
    • resolution of about 230 to 250 horizontal lines
  • SVHS
    • resolution of about 380 to 400 horizontal lines
  • 8mm
    • Compact
    • Resolution is about the same size as VHS
  • Hi-8
    • Resolution is about 400 horizontal lines
camcorders digital
Camcorders (Digital)
  • MiniDV
    • resolution of 500 horizontal lines
    • lightweight and compact
  • Digital 8
    • Similar to regular DV camcorders, but they use standard Hi-8-mm tapes
digital video formats
Digital Video Formats

dvd production
DVD Production