N-Media Provides High Quality products and services for the building  of  DVD products.

We like to pride ourselves on quality projects, disks and graphics, combined with video and sound.

High Definition Video

Resolution Aspect ratio Interlaced frames per second (fps) Progressive fps
1280 x 720 16:9   23.976, 24, 29.97, 30, 59.94, 60
1920 x 1080 16:9 25 (50i), 29.97 (59.94i), 30 (60i) 23.976, 24, 29.97, 30

 

  Frame Sizes
HD source formats are almost always either 1920 x 1080 resolution or 1280 x 720 resolution. Note that a substantial difference exists between the 1080 and 720 standards. The 1920 x 1080 resolution contains 2.25 times more pixels than 1280 x 720 resolution at the same frame rate. This difference substantially increases requirements for processing 1080 content in terms of encoding time, decoding speed, and storage.

 

 

 

Table of terrestrial HDTV transmission systems

Main characteristics of three DTTV systems
Systems ATSC DVB-T ISDB-T
Source coding
Video Main Profile syntax of ISO/IEC 13818-2 (MPEG-2 – Video)
Audio ATSC Standard A/52 (Dolby AC-3) ISO/IEC 13818-2 (MPEG-2 – Layer II Audio) and Dolby AC-3 ISO/IEC 13818-7 (MPEG-2 – AAC Audio)
Transmission system
Channel coding  
Outer coding R-S (207, 187, t = 10) R-S (204, 188, t = 8)
Outer interleaver 52 R-S block convolutional (I=12, M=17, J=1) 12 R-S block
Inner coding rate 2/3 Trellis code PCC: rate 1/2, 2/3, 3/4, 5/6, 7/8; constraint length = 7, Polynomials (octal) = 171, 133
Inner interleaver 12 to 1 Trellis code bit-wise, frequency, selectable time
Data randomization 16-bit PRBS
Modulation 8-VSB and 16-VSB COFDM
QPSK, 16QAM and 64QAM
Hierarchical modulation: multi-resolution constellation (16QAM and 64QAM)
Guard interval: 1/32, 1/16, 1/8 & 1/4 of OFDM symbol
Two modes: 2k and 8k FFT		 BST-COFDM with 13 frequency segments
DQPSK, QPSK, 16QAM and 64QAM
Hierarchical modulation: choice of three different modulations on each segment
Guard interval: 1/32, 1/16, 1/8 & 1/4 of OFDM symbol
Three modes: 2k, 4k and 8k FFT