Whats the difference between Dolby Pro Logic II and Dolby Digital? Aren all Dolby products the same?
4. Dolby Digital is a lossy data compression scheme. It must be decoded back into audio. It is used for DVD-Video and closed systems (like cable TV with Dolby Digital decoder boxes). It can’t be used if there might not be a Dolby Digital decoder. It will then play the AC-3 data noise, which if the stereo is turned up could blow the speakers! Pro Logic II is a “Matrix” encoder that uses analog processes, like phase shift and filtering, to “fold” the other channels into the left and right channels. Although not discrete like Dolby Digital, it can be played on normal stereo systems. If there is a Pro Logic II decoder, it will “unfold” the other channels back out of the stereo signal.
Related Questions
- Why are a lot of newer Dolby Digital receivers touted as having Dolby Pro Logic II processing? Doesn Dolby Digital decoding leave Pro Logic in the dust?
- Why are there two Dolby Virtual Speaker technology logos, one saying Dolby Digital and the other Dolby Pro Logic II?
- Whats the difference between Dolby Pro Logic II and Dolby Digital? Aren all Dolby products the same?
