MPEG 1/2/2.5 layer 3 files (.mp3 files) are encoded with a specified bit rate, usually 128 kbps (thousand bits per second) or, sometimes 160 or 192 kbps. If a decoder expects the same number of bits every second, this can really confuse it! Advertisement:Ī Variable BitRate Coder will vary the bit rate, depending on how much information is needed to store the audible part of a signal from moment to moment. Silence doesn't contain very much information at all - rather than storing thousands of zeros, you could just store a code meaning "so many seconds of silence". The point of psychoacoustic coding is that you only store the audible part, but just how much information is needed to represent the audible part varies from 1 moment to the next. An mp3 at 128kbps requires 128,000 (ish!) bits to store 1 second of audio. The bit rate of a coded audio file is the number of bits (binary digits - 0s or 1s - bits of digital information) that are required to store 1 second of audio.
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