JEITA CP-3451 - 82 - In the case of PCM format audio data, the data format of each sample is 8-bit or 16-bit integer. These sample data formats and their values are given in Table 25. Table 25    Sample Data Formats and Values Sample Size Data Format Minimum Interoperability Maximum 8-bit PCM Unsigned Integer 0 (00.H) 128 (80.H) 255 (FF.H) 16-bit PCM Signed Integer -32768 (8000.H) 0 (0000.H) 32767 (7FFF.H) The PCM format audio data contained in data-ck is packed as shown in Figure 40. Here the left-hand byte stores the lower address and the right-hand byte holds the upper address.   8-bit monaural PCM Sample 0 Sample 1 Sample 2 Sample 3 Channel 0 Channel 0 Channel 0 Channel 0 Byte 0 Byte 1 Byte 2 Byte 3 8-bit stereo PCM   Sample 0 Sample 1 Channel 0 (left) Channel 1 (right) Channel 0 (left) Channel 1 (right) Byte 0 Byte 1 Byte 2 Byte 3 16-bit monaural PCM   Sample 0 Sample 1 Channel 0 Lower Byte Channel 0 Upper Byte Channel 0 Lower Byte Channel 0 Upper Byte Byte 0 Byte 1 Byte 2 Byte 3 16-bit stereo PCM   Sample 0 Channel 0 (left) Lower Byte Channel 0 (left) Upper Byte Channel 1 (right) Lower Byte Channel 1 (right) Upper Byte Byte 0 Byte 1 Byte 2 Byte 3 Figure 40 Packing of PCM Audio Data 5.5.3   Basic Structure of m-Law Audio Data Each of the audio data samples of m-Law audio data has nonlinear (logarithmic) quantization characteristics. For this reason 16 bits of data may be represented in an 8-bit  size. In playback, either the data is first converted to linear 16-bit data and then put through a linear D/A converter, or else the analog signal is derived by going through an 8-bit nonlinear D/A converter with characteristics opposite the m-Law quantization characteristics. Details of the nonlinear quantization characteristics  and of the conversion between 8-bit  m-Law data and 16-bit linear data are given in the ITU-T G.711 standard. When the format type is m-Law (ITU-T G.711) format, the basic structure is expressed as in Figure 41. The  two  differences  from  PCM  format  are  the  larger  size  of  fmt-ck  (the  cbSize  file  exists)  and  the  existence  of fact-ck.