A:Answer Hello cheekoo, thank you for your message. Bitstream refers to compressed audio signals. Although Bitstream allows for the transfer of larger data using fewer bit-rates, the reproduced audio may not be completely lossless. To the contrary, LPCM is an uncompressed audio signal. The HD Audio (Dolby Digital Plus, Dolby TrueHD, DTS-HD High Resolution Audio, and DTS-HD Master Audio) is not output by bitstream. Oscar.