Multimedia Communications: Overview of Signal Compression - PowerPoint PPT Presentation

1 / 19
About This Presentation
Title:

Multimedia Communications: Overview of Signal Compression

Description:

Information Hiding. mmc2.04. Block Diagram of Communication System. mmc2.05 ... Subjective Scales of Quality and Impairment. Level Number Signal Quality Impairment ... – PowerPoint PPT presentation

Number of Views:66
Avg rating:3.0/5.0
Slides: 20
Provided by: jayant
Category:

less

Transcript and Presenter's Notes

Title: Multimedia Communications: Overview of Signal Compression


1
Multimedia CommunicationsOverview of Signal
Compression
  • mmc2.01

2
Applications and Bit Rates
mmc2.02
3
Dimensions of Performance I
  • Quality
  • Bit Rate
  • Delay
  • Complexity
  • mmc2.03

4
Dimensions of Performance II
  • Resiliency to
  • Transmission Errors
  • Storage Defects
  • Environmental Imperfections
  • Multiple Stages of Coding
  • Information Hiding
  • mmc2.04

5
Block Diagram of Communication System
mmc2.05
6
Recent Applications of Compression
  • IMT-2000
  • DAB
  • HDTV
  • Digital Movies
  • Digital Libraries
  • Internetworking
  • Personal Multimedia

  • Convergence
  • mmc2.06

7
Grades of Compression
  • Lossy Compression
  • Lossless Compression
  • Perceptually Lossless Compression
  • mmc2.07

8
Rate-Distortion Perspective
mmc2.08
9
The Principles of Compression
  • Removal of Redundancy
  • Removal of Irrelevancy
  • mmc2.09

10
The Disciplines of Compression
  • Signal Processing
  • DSP and Computing
  • Coding Theory
  • Information Theory
  • Psychophysics
  • mmc2.10

11
Measurement of Signal Quality
  • Objective Measures
  • Subjective Measures
  • Functional Measures
  • 6R 10 log10(1/sfm)
  • MOS and MIS
  • 10 log 10 (1/PL)
  • mmc2.11

12
Subjective Scales of Quality and Impairment
Level Number Signal Quality Impairment
1 Bad Very Annoying 2 Poor Annoying
3 Fair Slightly Annoying
4 Good Perceptible but not Annoying
5 Excellent Imperceptible mmc2.12
13
Measurement of Bit Rate
  • Sum of Subsystem Bit Rates
  • Sum Sampling Rate Average Bit Rate in
    Qzn.
  • Example of PCM
  • Example of CELP Speech Coding
  • Example of DCT Audio Coding
  • Example of MC-DCT Video Coding
  • Perceptual Entropy
  • mmc2.13

14
Measurement of Communication Delay
  • Encoder Delay
  • Decoder Delay
  • Communication Subsystem Delays
  • mmc2.14

15
Measurement of Complexity
  • Encoder Complexity
  • Decoder Complexity
  • Communication System Complexity
  • Memory
  • Arithmetic
  • Architecture
  • NSP, DSP, IC
  • mmc2.15

16
Techniques of Compression I
  • Quantization
  • scalar quantization
  • vector quantization
  • perceptual quantization
  • embedded quantization
  • multiple description quantization
  • mmc2.16

17
Techniques of Compression II
  • Redundancy Removal
  • linear prediction
  • motion compensation
  • sub-band filterbanks
  • linear transforms
  • statistical and object models
  • analysis-by-synthesis
  • mmc2.17

18
Multimedia Formats
  • Format Sampling Rate
    Frequency Band
  • Telephony 8 kHz
    200--3400 Hz
  • Teleconference 16 kHz
    50--7000 Hz
  • Compact Disk 44.1 kHz
    20-20000 Hz
  • Digital Audio Tape 48 kHz
    20--20000 Hz
  • CIF Video 3 Mpps
    36028830
  • CCIR Video 12 Mpps 72057630
  • HDTV 60 Mpps
    128072060
  • mmc2.18

19
Multimedia Compression Standards
NSA FS1015 2.4 kbps
speech LPC NSA FS 1016
4.8 kbps speech CELP CTIA IS-84
8.0 kbps speech VSELP GSM
13.2 kbps speech
RPE ITU G.72X, DECT, PHS 16,24,32,40
kbps speech ADPCM ITU G.721
64 kbps speech PCM ITU G.722
48,56,64 kbps audio
SB-ADPCM ISO JBIG
lt0.05gt bpp Fax AC ISO JPEGX
0.25-8 bpp Image DCT
ITU H.26X
p64kbps video MC-DCT ISO MPEGX
64-256kbps audio 16kbps-5Mbps
video mmc2.19
Write a Comment
User Comments (0)
About PowerShow.com