JEITA CP-3451 - 80 - 5.5.2   Basic Structure of PCM Audio Data PCM audio data has linear quantization (A/D conversion) characteristics, and is not encoded for compression. It therefore does not need to be decompressed for playback, but can simply be played by reading it directly. The basic structure of audio data when the format type is PCM (Pulse Code Modulation) format is shown in Figure 39. Address Offset Code Meaning (Hex) (Hex) +00 52 +01 49 +02 46 +03 46 "RIFF" (ckID) +04 ckSize (4 Bytes) +08 57 +09 41 +0A 56 +0B 45 "WAVE" (formType) +0C fmt-ck (24 Bytes) PCM format information   (size is 24 bytes fixed) +24 data-ck PCM format audio data Figure 39 Basic Structure of PCM Format