Adobe 22011292 User Guide - Page 337

ADOBE AUDITION 323 User Guide • Higher values (like the default value of 4096) mean cleaner-sounding filters. Even larger FFT sizes should produce extra smooth results, but will take a bit longer to process. • Smaller numbers make for a faster processing time, but the results may sound choppier. Overlays This is the number of FFTs that are overlapped in processing the vocoder. More overlays can produce smoother results, but will take longer to process. Values of 3 to 12 work well. Interval Size This sets the time interval (measured in milliseconds) per FFT taken. Values between 10 and 30 milliseconds usually work best, but higher overlay settings may require you to vary the interval size used. Note: Smaller values can produce a hum, while large values can be too blocky sounding. Window Width As an alternative to setting the Interval Size, you can simply choose a percentage to use for Window Width in specifying the interval used per FFT taken. A value of 90% will generally produce good results. Vocal Crossover This frequency setting is used to filter out, or separate, the source waveform's underlying base frequency (voice) from the vocal formants. With higher values, more formants and less of the actual vocal tone from the source is used. As this value gets lower, more of the speaker's voice characteristics get vocoded in. (This shouldn't be confused with the speaker's formant characteristics.) Ideally, you want none of the source voice itself carried over, but all of the formant information, so the synthesizer "talks". Resynthesis Window Choose the size of the window used for resynthesis of the vocoded signal. Narrower windows will make hard consonants sound clearer, and with higher overlay settings, narrow resynthesis windows will give better time resolution in the event that the vocoded signal sounds too smoothed out. The resynthesis window number should never be larger than or equal to the number of overlays. Affect Level This sets the amount of processed (vocoded) signal that ends up in the resulting waveform. Set this value to 100% for full vocoding, while 50% keeps more of the original waveform. A value of 15% will produce a subliminal effect, as it will just barely affect the process wave with the voice. Amplification You can set an amplification amount in dB to adjust the final waveform by. Usually this can be zero, but if the results are too quiet or loud, raise or lower this to compensate. For ease of use, try selecting Window Width and set it to about 90%, use 3 or 4 overlays, a resynthesis window of 1 or 2, and FFT sizes from 2048 to 6400.