ACS CFSound-II User Manual
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Contents
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CFSound-II Digital Audio SystemCopyright©1992-2006 by ACS, Sarasota, Florida 17 ALL RIGHTS RESERVEDDigital Audio RecordingInitially make all recordings (either music or voice) with a sample rate of at least 22KHz and 16-bit.This high quality, first-generation recording will later provide the greatest bandwidth and produce the bestsounding final audio.Recommended Recording Procedure1. Record any audio clip of your choosing @ 22 or 44KHz, 16-bit monaural or Stereo. Make sure thatyour samples do not clip (go above or below the sample window). The peaks of your audio clip,should, however, fill vertically at least 95% of the sample window. If they do not, you will need toboost your input signal by using a pre-amp or by some other means.2. Edit the clip until satisfied. You can use a sound editor or filter program, such as Syntrillium s CoolEdit to normalize the amplitude of the sample. Use this command cautiously though, since it alsotends to amplify noise levels. It is always preferable to re-record your sound clip at a higher level toachieve better fidelity.3. After your editing is complete and you are ready to make a file for the Compact FLASH II DigitalAudio System, use Cool Edit or a similar program to convert or down sample it to a 22KHz, 8-bitmonaural or 11KHz 8-bit Stereo clip.It is imperative that all initial editing and filtering be done to the audio clip while it is formatted at 16-bit and 22KHz or greater. Another important thing to remember when recording sound is that thebackground noise is amplified 256 times when down converting from 16 bit to 8 bit. It is, therefore,critical to the quality of your final sound that there is no background noise while you are recording yourclips or samples. The quiet noise of the fan on a PC for example, when amplified 256 times, can produce avery noticeable hiss or static sound in the recorded clips or samples. Please be certain that your recordingenvironment is absolutely quiet.Also remember that digital play-out devices do not introduce any static of their own other thanquantization noise. They only play back exactly what was recorded. If there is excessive static in the audioclip or sample, then there was probably static in it originally. |
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