Dolby TRUEHD is a lossless compressed audio track format specially developed by Dolby for HD DVD. It can support up to eight independent 24-bit /96 kHz full-band channels, and the highest bit rate of Blu-ray DVD is 18Mbps. Dolby claims that TRUEHD is 100% lossless audio, so besides saving bandwidth compared with LCPM of the same specification, it can also increase dialogue and overall volume control, such as realizing the function of night theater. Its core also has an AC35. 1 audio track data with a bit rate of 640K K. Even if the whole movie has only one TRUEHD audio track, the 5. 1 sound effect of the old power amplifier can be achieved through optical fiber transmission. In fact, from the structural analysis, TRUEHD is the combination of MLP audio track data and AC3, and MLP is the audio track coding format of DVD-Audio.
DTSHDMasterAudio in DTSHD is a lossless compressed audio track. DTS claims that it is a complete reproduction of the master effect of "bitforbit" recording, and it is also a complete lossless compression. The highest bit rate in Blu-ray Disc can reach 24.5Mbps, and the DTSHD kernel also has DTS5. 1 audio track data with the bit rate of 1.5Mbps, so it can also be transmitted to the old power amplifier through SPDIF to realize 5. 1 audio.