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Step 3 Editing and Processing the Uncompressed Audio
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Many audio processing programs are available, and you don t have to use one from the maker of your streaming software PC and Mac users can find downloadable audio programs at repositories such as wwwdownloadcom or TUCOWS, at wwwtucowscom UNIX users have a fine resource at soundcondorownet Look for programs for your operating system, and then for multimedia programs (See 34 for more information about downloading and installing programs) The most useful processing functions for web preparation are the following: I Editing Most often, you just edit out a few seconds of leading and trailing time Attempting to edit out coughs or profanity is much more time consuming avoid such editing if possible Most streaming formats also provide tools that enable you to perform simple editing later if needed I Removing direct current offset Also called removing DC bias, this process centers the waveform around the zero line I Automatic normalization of volume The audio processing program can seek out the loudest portion and adjust the volume of the entire recording, so that the loudest portion is just below the distortion level RealNetworks recommends normalizing to 95 percent or 05 dB
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I Volume (dynamic) compression If you haven t used an analog compression device in front of the recorder, compression can help bring all parts of the recording to within a narrow range of volume This process is terrible for a fine CD music recording, but is often wonderful for web audio that is to be delivered via modem The RealNetworks Production Guide suggests adjusting the volume to a threshold of 10 dB, a ratio of 4:1, and attack and release times of 100 milliseconds (ms) Then adjust the input volume level until you get about 3 dB of compression, and set the output level to around 0 dB
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Step 4 Encoding the File into a Compressed Audio Format
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Now that you have a digitized and processed, but uncompressed, audio file, it s time to get small Which format you choose depends on whether you want a static or streaming file, and which static or streaming format best suits your sound If your target is a hi-fidelity, nonstreaming MP3 file, several downloadable encoders are available at the shareware sites listed in the preceding section If streaming Real audio is your goal, use the RealSystem Producer (available at wwwrealnetworkscom/products/producer) or the free RealSystem Authoring Kit (available at wwwrealnetworkscom/resources/ smil/downloads/authkit) For streaming Windows Media, use Microsoft s Windows Media (available at wwwmicrosoftcom/windows/windowsmedia/wm7/encoderasp) For QuickTime audio, both streaming and static, use Apple s QuickTime Pro (available at wwwapplecom/quicktime/upgrade) In general, remember that audio compressed with a newer encoder version may not be playable by an older player Usually, the user can simply upgrade the player for free, but sometimes the new technology player may actually require a hardware upgrade Check the specs: you may need to restrict your encoding options so that compatibility is maintained, or perhaps simply download an earlier encoder version The simple secret to encoding good audio for modem users is to be conservative with your target bit rate, the connection speed at which you expect users to be able to download the file RealSystem, Windows Media, and QuickTime, the predominant audio streaming methods, are in fierce competition, and each company wants to showcase its higher bit-rate modes You may also want every bit of increased fidelity that you can produce However, if you can rein in your optimism about how high a throughput your users can obtain, you ll have much smoother sailing You may think that you re through with picking formats, but each encoder supports several codecs (coder/decoders), low-level software engines that do the real encoding work and determine the final bit rate If you are creating a streaming file, consider that both Microsoft and RealNetworks enable you to encode a single file at more than one bit rate, so that during playback, the server can choose a different encoding if the user connection is slower than expected RealNetworks calls this feature SureStream Before you choose this option, though, make sure that the following is true:
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