Adaptive Differential Pulse Code Modulation
Adaptive Differential Pulse Code Modulation (ADPCM) is a digital audio compression technique that encodes analog audio signals into digital data by predicting the next sample based on previous ones and adaptively adjusting the quantization step size. It reduces data size compared to standard Pulse Code Modulation (PCM) by storing only the difference between predicted and actual samples, making it efficient for storage and transmission. This method is widely used in telecommunications, voice recording, and multimedia applications where bandwidth or storage is limited.
Developers should learn ADPCM when working on audio processing, compression algorithms, or embedded systems that require efficient audio storage or transmission, such as in VoIP, digital telephony, or low-bitrate audio codecs. It is particularly useful in scenarios where real-time audio encoding with moderate quality and low computational overhead is needed, like in gaming audio, speech synthesis, or legacy media formats. Understanding ADPCM helps optimize audio data handling in resource-constrained environments.