Laserdisc video is analog but the audio is digital (tracks 1 and 2) and analog (tracks 3 and 4). The digital PCM soundtrack is stored the same as CD audio and comes out as analog through the red/white RCA cables or digital through the optical cable, same as a CD player. AC3 is stored differently as analog FM signal needing an AC3 RF output and a standalone demodulator, but I'm pretty sure once it gets through the demodulator, it's the same as DVD Dolby Digital (384 bitrate). DTS took the digital tracks' place and passes through optical and can be decoded by a DTS receiver same as DVD.