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Period: to
PHONAUTOGRAM
Mechanical analog; sound waveform transcribed to paper or glass -
Period: to
Phonograph cylinder (Edison)
Mechanical analog; hill-and-dale grooves, vertical stylus motion -
Period: to
Ediphone - Dictaphone
Mechanical analog, The Ediphone and subsequent wax cylinders used in Edison's other product lines continued to be sold up until 1929 when the Edison Manufacturing Company folded -
Period: to
Electrical cut record
Mechanical analog; electrically cut from amplified microphone signal, lateral grooves, horizontal stylus motion, discs at 7", 10", 12", most at 78 rpm -
Period: to
High Definition Compatible Digital (HDCD)
Digital. Redbook compatible physical CD containing 20–24 bit information (uses linear pulse-code modulation (LPCM) -
Period: to
SILK
Digital. Codec developed by Skype, extended into the Opus codec -
Period: to
DCP
Digital. Auro-3D codec -
Period: to
OPUS
Digital. OPUS-3D codec