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An audio frame is made up of 4 parts, The Header, Error Check, Audio Data, and Ancillary Data. Part 4 formats the bitstream, called an audio frame.The noise allocation adjusts itself in order to meet the bit rate and sound masking requirements. Part 3 quantifies and encodes each sample.Another MDCT filter is performed on the output. Part 2 passes the sample into a 1024-point FFT, and then the psychoacoustic model is applied.An MDCT filter is then performed on the output. Part 1 divides the audio signal into smaller pieces, these are called frames.The overall algorithm is broken up into 4 main Given blow is a block diagram of MPEG-1 Layer-3 encoder.
![how to compress sound file how to compress sound file](https://images.wondershare.com/videoconverter/en/compress/reduce-audio-file-step3.jpg)
An MP3 encoder also stores metadata about the sound, such as the title of the audio piece, album and artist name and other relevant data. The format also supports variable bit rates (the bit rate varies in different parts of the file). MP3 supports bit rates from 32 to 320 kb/s and the sampling rates 32, 44.1, and 48 kHz. The information remaining after frequency analysis and using a psycho-acoustic model is coded efficiently with (a variant of) Huffman coding. The idea is that the the human ear can only discern sounds from 20Hz to 20KHz, so any data outside of this threshold can be discarded to make the file smaller.
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Based on the frequency analysis, the encoder uses what is called a psycho-acoustic model to compute the significance of each band for the human perception of the sound. Based on this frequency analysis, the sound is split into frequency bands, each band corresponding to a particular frequency range. A frequency analysis of the sound is the basis for this transformation.
#How to compress sound file series#
With MP3, the sound samples are transformed using methods that involve Fourier Series Transformations. Availability of encoders and decoders and other supporting technologies The specification is available to everybody interested in implementing the standard. MP3, or more precisely MPEG-1 Audio Layer 3,is part of an audio-visual standard called MPEG. Use of Fourier Transforms in MP3 Audio Compression