User´s Guide
XI
The DirectX /Direct Media platform is a set of Windows 95/98/NT APIs
(Application Programming Interface) that allows to directly access
specialized hardware features. The various components of DirectX are
among others:
DirectDraw – Provides excellent game graphics by providing direct access to
display devices.
DirectPlay – Allows multi-player games over the internet.
DirectInput – Joystick interface.
DirectSound – Allows WAV file mixing.
Direct3D – Allows real-time 3D rendering.
DV is a format for digital video which utilizes 6mm tape cassettes
outstanding for the absence of noise and drop-out which were common to
Hi-8 and S-VHS.
The DV cassette features 500 lines of
&
resolution, component recording,
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signal-to-noise ratios (54dB) better than
&
Betacam, three times the
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chroma bandwidth of
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Hi8 and
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S-VHS (1.5MHz, the same as
Betacam),
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time code, 16-bit
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DAT-quality audio (or four tracks of 12-
bit, 32kHz), separate video and audio insert editing, and direct digital input
and output based on
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IEEE-1394 for multiple video-stream transfers and
editing with no generation loss.
On DV tapes, the video and audio data, the additional information (index
signals, time codes, etc.) and the ITI section (ITI= insert and track
information) are written to the DV tape as follows.
Additional information
12 tracks = 1 full image (PAL)
10 tracks = 1 full image (NTSC)
Video data
Audio data
ITI section
Recording format of a DV tape
All common TV systems (NTSC, PAL, SECAM) use the following trick to
avoid image flicker: Instead of creating a complete frame 30 (or 25 for PAL)
times per second, half the lines are displayed at 60 (50) times a second and
then the other half are woven in at 60 times per second in a process called
interlace scanning. First, all odd lines (lines 1,3,5 etc.), then, all even lines
(2,4,6 etc.) are drawn. The images consisting of either odd or even lines are
called fields.
The method according to which a computer stores images or other
information.
DirectX / Direct
Media
DV
DV cassette
DV recording
format
Field
File format
Summary of Contents for miroVIDEO DV200
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