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With all the additional channels beyond stereo, what does that mean for the living room Where should the additional two speakers in a 71 audio configuration be positioned Although there is the possibility for different positioning options, a very typical scenario is depicted in Figure 612 Besides the center speaker, the right and left speaker should be positioned at an angle of 30 degree, and the left surround and right surround speaker should be positioned at an angle of 150 degrees, respectively While this is the same configuration as a traditional 51 positioning, including the position of the LFE (low frequency effects or subwoofer speaker), the additional two speakers would be positioned as left and right surround side speakers, angled at 90 degree to the center speaker
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Figure 612 Speaker Positioning for 71 Channel Configuration
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Left speaker 30 Center speaker Right speaker 30
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Left surround side speaker 90
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Right surround side speaker 90
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Left surround speaker 150
Right surround speaker 150
Now, if you believe that eight channels should be sufficient for a home entertainment system, think again Japan s national broadcaster, NHK, has already started working on systems of the future supporting up to 222 audio channels Will that, finally, be the maximum number of audio channels Probably not!
Secondary Audio
Besides the primary audio stream, Blu-ray also supports a secondary audio stream This allows discs to contain audio streams to be played in parallel and to be mixed with the primary stream A typical application for a secondary audio stream is an audio commentary While watching and listening to the main feature the secondary audio commentary can be mixed in To allow this to happen, each Blu-ray player is required to have two audio decoders, as well as a panner/mixer that can mix the audio channels from the secondary audio stream with those of the primary audio stream The secondary audio stream can come from different sources It can be contained on the disc and synchronized to the movie, which would be a typical scenario for an on-disc audio commentary Or, it could also be made available as a download from a network source In such a scenario, the audio would be stored in the local storage of the player, yet could still be synchronized to the movie This would allow the audio commentary to be recorded later Note that the secondary audio does not have to be synchronized to the primary audio An example of an asynchronous secondary audio application might be a game where the user
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can select certain buttons on the screen that drive an audio response This response would not be synchronized to the main feature audio as the user determines at a random point in time when the audio is played The asynchronous secondary audio scenario also requires the files to come from local storage, not from the disc Blu-ray supports two secondary audio codecs Dolby Digital Plus (DD+) and DTS-HD LBR (low bitrate) (Table 615) As the secondary audio streams are limited to bitrates of up to 256 kbps, both DD+ and DTS-HD are special low bitrate versions of the codecs that only consist of an extension substream Besides the pure audio data, secondary audio streams must include additional mixing metadata This allows the content producer to define the mixing parameters rather than leaving it to the player to make creative decisions Table 615 Supported Secondary Audio Formats for Blu-ray
Mandatory Sampling Frequency Bits per Sample Maximum Data Rate Maximum Channels
Dolby Digital Plus DTS-HD LBR
Yes Yes
48 kHz 48 kHz
Compressed Compressed
256 kbps 256 kbps
51 51
Subtitles
Blu-ray supports two types of subtitles graphics-based and text-based The graphics based subtitles are called Presentation Graphics (PG) and are very similar to subpictures used with DVD Whereas, text-based subtitles, referred to as TextST, are a new method uniqure to Blu-ray that can provide a more dynamic way of rendering subtitles, albeit with some advantages and some disadvantages
Presentation Graphics
While the graphics-based subtitles for DVD only allowed for images with four colors (twobit images) to be used for subtitles, Blu-ray had to add some improvements Otherwise, the subtitles would look awful when rendered to high definition television screens So, the first improvement was to increase the allowed bit-depth for the graphics to 8 bits, or 256 colors This allows much smoother image rendering since it is possible to use more anti-aliasing Looking at the Presentation Graphics (PG) decoding model, it should be mentioned that there are three different kinds of segments described graphics object segment, composition segment, and palette segment A segment defines a specific timestamp at which the element should be decoded into the buffer At that point in time, the graphics processor decodes the RLE-compressed bitmap image into an uncompressed 8-bit graphic to be stored in the object buffer Once the image has been decoded, it can be used by one or by multiple graphics displays, as described in the composition segment The next step has the graphics controller mapping the information from the composition segment and the palette segment to the image data in the object buffer The graphics controller is essentially responsible for compositing the image data onto the player s graphics plane, following the descriptions in the composition and palette segments In other words, the controller applies the cropping, color, and transparency information to the uncompressed image in order to render the final full-color
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