Compression - week 11
- Created by: harveyf2801
- Created on: 11-01-21 16:27
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- Compression
- Lossy
- Constant size, Variable quality
- Uses psycho-acoustic audio masking removing inaudible data
- Temporal masking
- Removing faint sounds that can't be heard for a short time after loud sounds
- Range thresholds
- Using the Fletcher-Munson to band limit the audio signal based on the range of human hearing
- Simultaneous masking
- One sound masks out another sound, by level or frequency, played at the same time
- Frames the data and analyses frequency bands for each frame
- Temporal masking
- Can't be decompressed back to it's original state
- Not ideal for archive data storage
- Can Compress to 1/10 of original size
- Lossless
- Compresses less than Lossy
- Preserves information and can be decompressed
- Reduces redundancy
- Pattern recognition
- RLE (Run Length Encoding) - finding repetitions in audio samples
- Encoding continuous runs of data into an multiplier and a sample of the dataword
- RLE (Run Length Encoding) - finding repetitions in audio samples
- Pattern recognition
- Lossy
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