qr code generator c# codeproject Expert s View: Working with Surround Sound Audio in Software

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channels have the same frequency response and the image stability is vastly improved, because you are not matrixing Now you re not worrying about a loud sound in the center channel pulling in everything else inward, spatially speaking So, it is a much more stable multi-channel sound image that is created If you are watching a DVD movie of Bridges of Madison County and you ve got Clint Eastwood and Meryl Streep out sitting in some eld somewhere talking, if you are watching it on a TV broadcast, when they speak, subtly but perceptively you will notice that the chirping crickets in the background tend to get quieter during the instance while they are actually speaking-the cricket level is riding up and down With a DVD version of the same lm, the spatial position of the crickets is going to be rock solid They aren t going to be affected by what is happening in the center channel Sounds like to accomplish this, you need a whole new set of audio tools That is basically true You would have to follow the multi-channel lm sound model, rather than the stereo, or two-channel music production model Yes, you do need some different tools and different aesthetic judgements to make We ll talk a little bit about that but before we do, let me nish the thought on Dolby Digital We ve mixed our program to ve discrete channels plus we ve got this low-frequency effects channel We store them on some medium and now we want to stick them on the DVD While, the DVD doesn t have enough bandwidth to carry if we use the compact disc data rate, 16-bit, 441KHz, that requires 10MB per minute for stereo Now, let s make life easy and say we are talking about 6 channels, even though that is not quite true, that would mean three times that, now we have gone to 30MB per minute you just can t get the data off fast enough to do video and all that sound So, you need a way to compress the data (we re talking about digital data compression as opposed to audio signal processing compression) to reduce the data rate of all this audio That is what Dolby Digital does It is a data compression codec in the same way that RealAudio is a codec for compressing mono or stereo sound, so that you can download it over a modem Dolby Digital makes it possible to get all of those channels of discrete sound onto a DVD and then off again within the constraints of how much bandwidth the DVD player has how much data can you get off a disc at one time
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Actually, Dolby Digital was originally designed to get digital audio onto a piece of movie lm for cinema distribution, but the same resource-limitation issues apply to DVD as well Note that there are other competing codecs, for example DTS-Digital Theater Sound and a Sony system called SDDS (Dynamic Digital Sound) When you go to movie theaters you may see a Dolby Digital trailer at the beginning or maybe it will say DTS, maybe it will say SDDS But in the home theater world, it is pretty much Dolby Digital Is Dolby Digital the successor to Dolby AC3 They are one and the same Originally, Dolby began calling this process by their internal code name AC3, short for audio codec number 3 Later they changed their mind and said, Wait a minute We don t want you to use AC3 as a term to reference this process Now we re calling it Dolby Digital But by then the cat was out of the bag you will see equipment that has a connector on the back that will say AC3 and you will hear people talk about AC3 I avoid saying AC3 out of deference to Dolby s marketing department, but AC3 and Dolby Digital are one and the same Are there differences between the approach you are describing for DVD-Video and the still evolving DVD-Audio format The production process, up to the encoding will be the same But there will be different audio codecs that offer higher sound quality than Dolby Digital for audio-only DVDs Unfortunately, DVD-Audio is still on hold awaiting the release of players A well-publicized hack of the DVD encryption scheme has introduced a delay in the introduction of the players Maybe they want to revisit the encryption spec before they start shipping products It s very unfortunate, because so many DVD players have been sold, that a lot of people will be confused or annoyed when new audioonly DVDs come out that won t play on the DVD players they already own Does any of this relate to game development There are systems that are using Dolby Digital for sound playback The problem is that it is very computationally intensive to be converting those discrete channels of audio to the Dolby Digital signal There aren t any games that I am aware of that in real time, as you turn your head in the game, pan the sound around in a Dolby Digital signal They are using it more for pre-rendered ambiences (that doesn t change based on the per-
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