IMA ADPCM Encoder and Decoder for Audio Compression and Decompression
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Date
2015-12-22T07:35:29Z
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Abstract
Digital audio compression allows the storage and transmission of audio data
effectively. The audio compression techniques offer different levels of complexity,
compressed audio quality, and amount of data compression. The digital representation of
audio data offers many advantages: high noise immunity, stability, and reproducibility
Audio in digital form also allows the efficient implementation of many audio processing
functions (e.g., mixing, filtering, and equalization) through the digital computer. The
conversion from the analog to the digital domain begins by sampling the audio input in
regular, discrete intervals of time and quantizing the sampled values into a discrete number
of evenly spaced levels. The digital audio data consists of a sequence of binary values
representing the number of quantizer levels for each audio sample.
Fig.1.1: Digital audio process
The method of representing each sample with an independent code word is called
pulse code modulation (PCM).And as the technology advances, other forms of coding such
as differential pulse code modulation(DPCM), Adaptive differential pulse code
modulation(ADPCM) etc., have been developed.
There are mainly two types of data compression methods used namely, lossey
compression and lossless compression method. A potential advantage of losey-coding
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IMA ADPCM Encoder and Decoder for Audio Compression and Decompression, E Priyanka, Suraj B, Vedant Samariya