Adaptive Differential PCM
Adaptive Differential PCM (ADPCM) is a lossy audio compression technique that encodes audio signals by predicting sample values and quantizing the difference (error) between the actual and predicted values. It adapts the quantization step size dynamically based on the signal characteristics to improve compression efficiency while maintaining acceptable audio quality. This method is widely used in telecommunications, digital voice recording, and multimedia applications where bandwidth or storage is limited.
Developers should learn ADPCM when working on audio processing, codec implementation, or embedded systems that require efficient audio compression with low computational overhead. It is particularly useful for real-time voice communication (e.g., in VoIP or mobile networks), audio storage in resource-constrained devices, and applications where a balance between compression ratio and audio fidelity is needed, such as in gaming or legacy multimedia formats.