Because of the lossless technique is Dolby True HD and DTS-HD Master Audio equal when it comes to sound quality såfremst they use the same bit resolution and sampling frequency. Currently there are few publications that have this sound system on Blu-Ray. DTS-HD Master Audio support sound 7.1 audio code for up to 24 bit / 96 kHz. DTS-HD Master Audio allows up to 18 Mbp / s bitstream. This audio format is in practice not in use on Blu-Ray releases.ĭTS-HD Master Audio is just like Dolby True HD a lossless audio system for up to 8 dedicated channels. Dolby Digital Plus offers up to 7.1 audio and encoded on the disc with up to 1.7 Mbit / s which is far more information than the DVD standard offers via Dolby Digital. This means that you can lose something sound quality compared to the original. Unlike Dolby TrueHD is Dolby Digital Plus is not lossless. If you have equipment that does not support Dolby TrueHD will automatically be rendered this soundtrack if one chooses Dolby TrueHD sound.ĭolby Digital Plus is also a new format developed for high-definition formats. Movies equipped with Dolby TrueHD is mandatory to attach a 640 kbit Dolby Digital soundtrack. That is why many of the first Blu-ray players that do not give you any opportunity to enjoy Dolby TrueHD sound. This is also a voluntary system so that there be no requirement for support for this system in Blu-Ray players. Another option is that the player can decode the audio into PCM to then send PCM audio via HDMI to receieren. First possibility is that the player has internal decoding of Dolby TrueHD so that it can send the audio out via a 5.1 or 7.1 analog output and connected to the corresponding input on your home receiver. If you do not have a decoder in hjemmekinoreceivern for Dolby TrueHD, there are other opportunities to experience this quality. The range of Blu-ray players that can output Dolby TrueHD signal you can see here. An overview of receivers and amplifiers that supports decoding of Dolby TrueHD can be found here. To transmit Dolby TrueHD signal to a receiver / processor must use HDMI connection where the player and receiver supports version 1.3 of HDMI. It is doubtful whether it will ever come releases with that sound. Maximum sound quality that can be used on Blu-ray is 7.1 audio with 24-bit bit depth and 96kHz sampling frequency. This is about half of what similar PCM signal takes. Dolby TrueHD can be encoded with 24 bits or 16 bits of accuracy and bit rate is variable, but is about 1.5 Mbit / s in average by 16 bits and about 3.5 Mbit / s at 24 bit 5.1 sound. This sound provides the ability to retain the sound quality from the original PCM soundtrack without taking up the same space on the disk as a PCM audio track will do. An overview of receivers / amplifiers that can handle MPCM sound can be found here.ĭolby TrueHD To prevent sound takes so much space, but also to retain the sound quality Dolby developed a so-called lossless lydsystemsom they call for Dolby TrueHD. It's not all receivers with HDMI, supporting multichannel PCM. It is mandatory for all Blu-ray players to support multichannel PCM over HDMI to the receiver / processor. This reduces the need for space for about 35 Mbytes per minute. Therefore it is a good part of the films that use PCM audio. With 50GB of storage, Blu-ray room to be able to use 24 bits / 48 kHz PCM audio and even have 30-40GB accommodate film depending on length of the film. (24-bit PCM audio at 48 kHz sampling frequency takes about 50 MByte per minute). To accommodate such a sound system on a DVD would cause the sound would take the space of a movie in about two hours. Today's modern films produced with 24-bit PCM 48 kHz sampling with 6 channels (5.1) On Blu-Ray used the PCM with 6 or 8 channels (5.1 / 7.1). It is this technique used on regular CDs, but with 2 channels. PCM stands for Pulse Code Modulation and is an uncompressed technique for digital audio. The disadvantage of audio systems such as DVD use is that they are compressed in relation to the original soundtrack is PCM. It is mandatory that Blu-ray players can decode or send out these audio formats from the player. Here you get a full overview of audio systems for Blu-Ray.īlu-Ray supports the same formats as DVD does. The sound on Blu-Ray has received a boost compared to regular DVD at the introduction of several new audio formats from Dolby and DTS.
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