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Audio Fundamentals, Compression Techniques & Standards
http://ce.sharif.edu/courses/91-92/2/ce873-1/resources/root/Class%20Notes/MMN-lec3-Audio-911121.pdf
Some techniques for sound compression: PCM - send every sample DPCM - send differences between samples ADPCM - send differences, but adapt how we code them LPC - linear model of speech formation CELP - use LPC as base, but also use some bits to code corrections for the things LPC gets wrong.
Multimedia Systems: Compression Techniques
https://eclass.uoa.gr/modules/document/file.php/D246/Lectures/compression.pdf
1. Motivation 2. Requirements 3. Fundamentals 4. Basic Encoding Steps 5. Basic Audio Coding Schemes 6. JPEG 7. H.261 (px64) 8. Further ITU Video Schemes (H.263, H.3xx) 9. MPEG-1 10. MPEG-2 11. MPEG-4 12. Wavelets 13. Fractal Image Compression 14. Conclusion Multimedia 3-compre.frm 4 1. Motivation
An explanation of video compression techniques.
https://www.reachcambridge.com/wp-content/uploads/wp_videocompression_33085_en_0809_lo.pdf
bandwidth available. To circumvent this problem, a series of techniques – called picture and video compression techniques – have been derived to reduce this high bit-rate. Their ability to perform this task is quantified by the compression ratio. The higher the compression ratio is, the smaller is the bandwidth consumption.
(PDF) Video Compression Techniques: An Overview
https://www.researchgate.net/publication/46279980_Video_Compression_Techniques_An_Overview
This study demonstrates the representative efforts on video compression and presents the properties and limitations of: H.261, H.263, MPEG-1, MPEG-2, MPEG-4, MPEG-7 and H.264. However, we show that...
VIDEO AND AUDIO COMPRESSION THE MPEGs STANDARDS
https://users.cs.fiu.edu/~chens/courses/cis6931/2001/Fernadez.pdf
interpolation. The descriptions of these techniques are as follows: Stream Structure In its most general form, and MPEG system stream is made up of two layers: - The system layer contains timing and other information needed to demultiplex the audio and video during playback - The compression layer which includes the audio and video streams
Audio and Video Compression - SlideShare
https://www.slideshare.net/apashishp/audio-and-video-compression-64399575
AUDIO LEVEL COMPRESSION • Downward compression reduces loud sounds over a certain threshold while quiet sounds remain unaffected. • Upward compression increases the loudness of sounds below a certain threshold while leaving louder sounds unaffected. 9.
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