By Hervé Benoit
Electronic tv is as an authoritative and whole evaluate that describes the expertise of electronic tv broadcasting. It offers a radical technical description of the underlying rules of the DVB normal and a number of the steps of sign processing. additionally incorporated is a whole technical word list of phrases, abbreviations, and expressions that provides you fast reference.
Now in it's third version, electronic tv, this ebook is totally updated with typical and new applied sciences including:
- DVB and DVB-S2
- cellular television DVB-H
- excessive Definition codecs 1080i and 720p
- Compression together with MPEG, H.264, and VC-1
If you're looking for a concise technical briefing that may speedy get you in control with no getting misplaced - this can be the booklet you wish.
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Additional info for Digital Television: Satellite, Cable, Terrestrial, IPTV, Mobile TV in the DVB Framework (3rd Edition)
The eliminated values are replaced by 0 (an operation known as thresholding); this part of the process is obviously not reversible, as some data are thrown away. 5 Result of thresholding and quantization. quantity of information required to encode a block; here again the process is not reversible, but it has little effect on the perceived picture quality. 5. 4. 6. 6 “Zig-zag” reading of the coefﬁcients of the matrix. 1). 3 Compression of ﬁxed pictures The first applications aimed at reducing the amount of information required for coding fixed pictures appeared in the 1980s, and they had as their primary objective the significant reduction of the size of graphics files and photographs in view of storing or transmitting them.
It consists of zeroing the coefficients below a predetermined threshold, and quantizing the remaining ones with decreasing accuracy as the frequency increases. Contrary to the 63 other (AC) coefficients, the DC coefficient is DPCM coded (differential pulse code modulation) relative to the DC coefficient of the previous block, which allows a more accurate coding with a given number of bits. This allows the visibility of the blocks on the reconstructed picture to be reduced, as the eye, although not very sensitive to fine details, is nevertheless very sensitive to small luminance differences on uniform zones.
If we assume a sinusoidal signal of 28 Digital Television maximum peak-to-peak amplitude VPP , the corresponding maximum RMS voltage is VRMS = VPP /2y/2. Thus √ √ SA /Nq dB = 20 × log VPP × 2b × 12 VPP × 2 2 √ √ = 20 × log 2b × 12 2 2 or √ √ b × 6 + 20 log 12 − log 2 2 D + 20 × 0 09 SA /Nq dB SA /Nq D + 1 8 dB Thus, in the case of Example 2 (audio signal quantized with 16 bits), D 96 dB and SA /Nq 97 8 dB. 29 This page intentionally left blank Source coding: compression of video and audio signals 3 In the preceding chapter, we explained why compression was an absolute must in order to be able to broadcast TV pictures in a channel of acceptable width.
Digital Television: Satellite, Cable, Terrestrial, IPTV, Mobile TV in the DVB Framework (3rd Edition) by Hervé Benoit