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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Multimedia: Sound recording and video capture

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Multimedia sound recording and video capture

Multimedia: Sound recording and video capture


Sound capture

SOUND CAPTURE


Recording

Recording

  • Microphone

  • Sound Card

  • Software


Video capture

VIDEO CAPTURE


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


Television

Television

  • 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.


Television1

Television

  • 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.


Television2

Television


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.


Television3

Television

  • 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)


Monitors

Monitors

  • 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


Cables

Cables


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.


Multimedia sound recording and video capture

RGB

  • RGBHV (15 pin High Density D-Type connector ) (VGA)


Firewire

FireWire

  • 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


Firewire vs usb

FireWire vs. USB


Camcorders analog

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

http://www.videohelp.com/dvd


Dvd production

DVD Production

  • http://www.dvdr-digest.com/

  • http://www.dvdrhelp.com/

  • http://www.dvunlimited.com/

  • http://www.canopus.com/

  • http://www.dazzle.com


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