The capacity of the blu-ray technology is very much higher than the HD-DVD recording capacity. DVD forum backs the High definition DVD but on the other hand the companies that support bluray format are larger in number. Blu-ray disks have more ability to store data per layer than the High definition DVD disk. Recording and transfer speed of blu-ray technology is faster because its NA value is higher. At rotation speed of 10,000 (RPM) results in blu-ray drive (12x) that is equivalent to HD-DVD (9x).



So higher speed rotation is required by the High definition DVD so that it can reach up to the bluray disk format's transfer speed. Internal structure of DVD & HD DVD is different from that of blu-ray disc. The inside layers of the disks is different but have the same disk thickness. So the development of the hybrid disks is very much easier as the thickness of the blu-ray data layer is 0.1mm. Bluray single sided disk can incorporate dual-layer 8.5GB DVD9 disk and disk (double sided) is required in high definition DVD. Blu-ray disk players? process all the associated elements of audio in the disk player for implementing the interactive characteristics of BD live & Bonus view.

This processing model is similar to which was utilized for video on the DVD disks. This processing model involves the decoding of main video. Afterwards menus or sub-titles are overlaid to the main video and then the complete presentation of video as output. The output can be in base band digital signals (High-Definition Multimedia Interface (HDMI), Digital Visual Interface DVI) or analog signals (component, composite). The decoded sound tracks from the blu-ray disk and the elements of audio that are downloaded or streamed through internet or either internally generated by the blu-ray player are decoded in the form of Pulse code modulation digital signals. PCM (pulse code modulation) is a format that is used by the disk players for mixing and performing the internal operations of audio processing. Button sounds, streaming commentary and the secondary audio are blended with primary sound track 7.1 or 5.1 from the disk in mixing stage. This results in complete presentation of audio as anticipated by the creator of the content.

As the decoding system is built in these HD-formats, so its complete playback capability is enabled with audio/video receivers of next version and also with the previous generation receivers (audio/video) that were not equipped with decoders of Dolby True-HD & Digital plus. Bluray players depending on their model can output the sound tracks that are decoded internally as analog signal (multi channel) through analog connections, PMI (Pulse code modulation) signal through HDMI High Definition Multimedia Interface or as signal (Dolby Digital) through digital or coaxial connection. Most of the bluray disk players provide all of these three choices.

High Definition Multimedia Interface is capable of transferring signals of both video & audio. Therefore one cable is needed in order to connect the A/V receiver and the disk player. Connection through the High Definition Multimedia Interface (HDMI) enables the complete post processing DSP application features of the A/V receiver like the ?bass management?, ?Dolby pro-logic II-z? or ?Dolby pro-logic II-x? capability of channel expansion (5.1 to 7.1 to 9.1) and the distance settings of the speaker. The users can fully enjoy the HD-audio through the analog multi-channel output when the blu-ray player is connected to audio/video receiver having analog inputs of multi-channel. Post processing of DSP (digital signal processing) to input signals (analog) is not applied by some A/V receivers.

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