What Is The Difference Between PCM And Dolby Digital?

Last Update date : 2012.01.10

  PCM is short for pulse code modulation. It is an older digital encoding and decoding technique used to digitize and play back music and sound. PCM is typically limited to two channels.

Dolby Digital is a newer digital encoding and decoding technique used to digitize and playback music and sound. Dolby Digital can generate from one to six discrete channels of digital audio.

Most DVD players sold in the US provide two channel versions of Dolby Digital six channel (Dolby Digital 5.1) movie sound tracks. Some DVD players sold in the US come equipped with both two channel and six channel capability.

DVDs made for the US market contain soundtracks in either the PCM or Dolby Digital (Dolby AC-3) format. Any DVD player sold in the US must support both formats


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