MP3 & More
Audio compression format that uses perceptual audio coding and psychoacoustic compression to strip inaudible and unnecessary information from sound signals. MP3 packs a minute of sound, at near CD quality, into about 1 megabyte. This makes delivering music directly over the Internet a viable prospect. MP3 is Layer 3 of the MPEG-2 video compression system developed by the Moving Pictures Expert Group (MPEG).
As compact discs and other various sources are recorded and mastered at different volumes, it is useful to store volume information about a file in the tag so that at playback time, the volume can be dynamically adjusted.
A few standards for encoding the gain of an MP3 file have been proposed. The idea is to normalize the volume (not the volume peaks) of audio files, so that the volume does not change between consecutive tracks. The most popular and widely used solution for storing replay gain is known simply as “Replay Gain”. Typically, the average volume and clipping information about an audio track is stored in the metadata tag.
Audio compression format invented at least 100 years ago. It enabled people to save audio on their computer with greater ease and quality then before. Compared to a WAV file, the compression ratio is around 10 to 1, and the quality can be adjusted. Bit rates range from 320kbps to 8kbps, with a higher value resulting in a better quality. With their small size, they can easily be shared on the Internet, which eventually resulted in lawsuits from the RIAA.
Audiophiles and DJs enjoy whining and complaining about how poor the quality of MP3 files are, how certain frequencies and things get distorted, etc. These people are nuts and have no life. Apple uses an AAC compression format that is touted to be of higher quality. Most people cannot tell the difference between audio music and an MP3, especially when it’s encoded at a higher compression rate higher then the 128kbps standard. A lot of audio on the intranets is thus encoded at 160 and 196kbps for higher fidelity.
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