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發表於 2009-12-28 17:52:31
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因為HDX BD-1, N3同Popcorn Hour的C200也是採用sigma 864X芯片, 而C200當播放有PiP的影片時不能以源碼輸出, 只能輸出LPCM 而N3亦有樣同問題, 但N3可以改為簡易藍光導航去取替傳統藍光Menu, 就可以播放有PiP的影片時能以源碼輸出 為何有PiP的碟特別麻煩呢, 請看看 <A href="http://forum.blu-ray.com/showthread.php?t=41820" target=_blank>http://forum.blu-ray.com/showthread.php?t=41820</A> BITSTREAMING HD AUDIO Dolby TrueHD and DTS-HD MA compress the LPCM audio signals without any loss of original data in order to save space on a disc. When the saved signals are decoded and decompressed, we will get LPCM signals again. If the disc player decompresses and decodes the compressed audio, it will send the LPCM signals to the receiver. The receiver will then covert the LPCM signals from digital to analog for playback through the speakers. Alternatively, the compressed Dolby TrueHD or DTS HD MA signals can be sent by the player in raw digital format to the receiver (the older PS3 cannot do this) for decoding to LPCM and digital-to-analog conversion. This process is called Raw Bitstream Transport, High Bit Rate Audio Streaming, or Direct Digital Audio Mode, depending on the manufacturer. Bitstreaming is the preferred choice of many critical listeners. If the player decodes the high resolution audio to PCM, any version of HDMI can transmit the signal to the receiver. If the player sends the signal in native digital Bitstreams to the receiver, HDMI terminals on both the disc player and the receiver must be version 1.3, and the receiver must have the ability to decode high resolution audio codecs. If the receiver does not have HDMI inputs, your only option is to use multi-channel analog cables (PS3 does not have multi-channel analog outputs), and you must rely on the player (assuming the player has all the decoders for the high-resolution audio formats) to perform all the digital-to-analog conversion. The main drawbacks to using analog connections is that your sound quality will be limited by the quality of the decoders, audio processors, and digital-to-analog convertors inside the player. Another problem with analog connections is that bass management must be handled by the player or the receiver must have the ability to handle bass management in analog domain. THE IMPLICATIONS OF DIGITAL BITSTREAMING ON AUDIO IN BONUS VIEW FEATURES As was mentioned earlier, many critical listeners prefer that all the processing and digital-to-analog conversion be done in the receiver or pre-amp, which may have superior audio components. To do this, we need to send the audio signal in native digital Bitstreams to the receiver or pre-amp. The downside to sending the advanced audio codecs in native bitstream is that you can only send the movie soundtrack itself. Any secondary content, like menu beeps or the audio that accompanies Picture-in-Picture interactive features is not part of the original bitstream and will not be transmitted. Audio commentaries and alternative-language audio may also be affected, depending on how the disc was authored. The only way to send the additional content is by allowing the disc player to perform the audio decoding itself, during which the player mixes the new material on top of the movie soundtrack for transmission in either PCM or analog format. In some cases, you may lose the lossless soundtrack. If you are watching a movie with the Bonus View features enabled, and you want to restore the high resolution audio, it may require you to stop the disc playback to go to the player’s setup menu, and that can be a big nuisance. |
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