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Audio Compression - 123seminarsonly.com
http://www.123seminarsonly.com/Seminar-Reports/022/38868798-Audio-Compression.pdf
IT6902; Semester B, 2004/2005; Leung Audio Compression 6 Frequency Masking • The general situation in regard to masking is as follows: 1. A lower tone can effectively mask (make us unable to hear) a higher tone 2. The reverse is not true - a higher tone does not mask a lower tone well 3. The greater the power in the masking tone, the wider is its
Simple Audio Compression Methods
https://users.ece.utexas.edu/~ryerraballi/MSB/pdfs/M4L4.pdf
Play 1 kHz masking tone at 60 dB, plus a test tone at 1.1 kHz at 40 dB. Test tone can’t be heard (it’s masked). Stop masking tone, then stop test tone after a short delay. Adjust delay time to the shortest time when test tone can be heard (e.g., 5 ms). Repeat with different level of the test tone and plot: Net effect of masking: MPEG Audio Facts
Audio Compression - Signals Systems1
http://www.signal.uu.se/Courses/CourseDirs/SignSyst/rapporter/AudioHBV.pdf
frequencies is short. This is called temporal masking. By removing all frequencies that are masked, the ones with low energy, the information amount is reduced without effecting our interpretation of the sound. Fig. 2 Temporal masking Areas of concern for audio compression Although high bit rate channels and networks become more and more accessible,
6. Perceptual Audio Coding
https://www.cs.ucf.edu/courses/cap5015/Image%20compression%20and%20video%20compression%202004%20notes%20-%206%20Audio%20compression.pdf
Perceptual Audio Compression zThe basis of the Perceptual Codecs is Psychoacoustic Masking. zAn audio file will contains sounds that are not heard by us, even though these sounds lie within the human audible range. zMasking Techniques: zFrequency (Concurrent) Masking zTemporal Masking #18 Dynamic Range of Hearing
MP3 Compression: The Concept
https://cs.stanford.edu/people/eroberts/courses/soco/projects/data-compression/lossy/mp3/concept.htm
MP3 compression is so successful for imitating CD quality music because it utilizes the concept of auditory masking. Basically, this type of masking occurs when the presence of a strong audio signal makes weaker audio signals in the proximity imperceptible.
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