Audio digital
CD dibuat dengan cara perekaman sinyal yang berbeda dari generasi perekaman sebelumnya, perekaman pada piringan hitam dan perekaman pita magnetik bentuk perekamannya berupa sinyal analog, sedangkan perekaman dipermukaan kepingan CD berupa sinyal digital yaitu pengkodean sinyal 0 dan sinyal 1, hal ini dalam usaha untuk merampingkan media penyimpanan musik dengan memperbaiki kualitas suara yang dihasilkan.
European Data Format
HEADER RECORD (we suggest to also adopt the 12 simple additional EDF+ specs)
8 ascii : version of this data format (0)
80 ascii : local patient identification (mind item 3 of the additional EDF+ specs)
80 ascii : local recording identification (mind item 4 of the additional EDF+ specs)
8 ascii : startdate of recording (dd.mm.yy) (mind item 2 of the additional EDF+ specs)
8 ascii : starttime of recording (hh.mm.ss) 
8 ascii : number of bytes in header record 
44 ascii : reserved 
8 ascii : number of data records (-1 if unknown, obey item 10 of the additional EDF+ specs) 
8 ascii : duration of a data record, in seconds 
4 ascii : number of signals (ns) in data record 
ns * 16 ascii : ns * label (e.g. EEG Fpz-Cz or Body temp) (mind item 9 of the additional EDF+ specs)
ns * 80 ascii : ns * transducer type (e.g. AgAgCl electrode) 
ns * 8 ascii : ns * physical dimension (e.g. uV or degreeC) 
ns * 8 ascii : ns * physical minimum (e.g. -500 or 34) 
ns * 8 ascii : ns * physical maximum (e.g. 500 or 40) 
ns * 8 ascii : ns * digital minimum (e.g. -2048) 
ns * 8 ascii : ns * digital maximum (e.g. 2047) 
ns * 80 ascii : ns * prefiltering (e.g. HP:0.1Hz LP:75Hz) 
ns * 8 ascii : ns * nr of samples in each data record 
ns * 32 ascii : ns * reserved 
DATA RECORD 
nr of samples[1] * integer : first signal in the data record 
nr of samples[2] * integer : second signal 
.. 
nr of samples[ns] * integer : last signal