The PlayStation plays back ADPCM (Adaptive Differential Pulse Code Modulation) audio data as specified in
the CD-ROM XA (eXtended Audio) standard (this is hereafter abbreviated as XA-ADPCM audio).
The PlayStation supports the following four types of XA-ADPCM audio:
Table 1-1: XA-ADPCM audio data types supported by PlayStation
Sampling frequency Stereo/monaural
37.8 Khz Stereo
37.8 Khz Monaural
18.9 Khz Stereo
18.9 Khz Monaural
Figure 1-9: XA-ADPCM audio sectors for streaming data with audio
Subheader
(8 bytes)
XA-ADPCM audio
(2324 bytes) 2336 bytes
Dummy data
(4 bytes)
Note that the sector header and data areas in Figure 1-8 are exactly identical to their counterparts in
Figure 1-2.
The subheader size is specified by the CD-ROM XA standard. This subheader contains information such as
flags for distinguishing data sectors from audio sectors.
A dummy data section is added to the end of the sector to make the sector size for XA-ADPCM audio
sectors the same as for non-XADPCM audio sectors.