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My files do not sound right
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| · | The file plays in the telephony system and has recognizable human speech but plays too fast and at too high a pitch. This means the correct coding algorithm was selected to play the file but the wrong sample frequency. Select a lower sample rate when playing back on the telephony system or, if that is not possible, a higher sample rate when recording with Vox Studio.
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| · | The file plays in the telephony system and has recognizable human speech but plays too slow and at too low a pitch. This means the correct coding algorithm was selected to play the file but the wrong sample frequency. Select a higher sample rate when playing back on the telephony system or, if that is not possible, a lower sample rate when recording with Vox Studio. In some rare instances we have found that the hardware was in fact the culprit. We have seen a sound card that had a playback frequency 9% off the one we had programmed, at low frequencies. As a result files recorded at a higher sample rate, and then converted, sounded off-pitch when played back at 6 or at 7.2 KHz.
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| · | The converted voice files sound "muffled" and seem to lack clarity. This is usually the result of a drastic reduction in sample rate that results in a perceived increase in low-pitched sounds. This is most audible if the voice talent has a voice with high bass content to begin with. Use the Intelligibility Filter option in the Vox Studio conversion dialog boxes to correct this effect.
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| · | The file is playing but produces a very loud screeching sound. This means one has selected the wrong coding algorithm to record the file. If you chose an ADPCM variant try A-law or Mu-law for instance, or another form of ADPCM. The most efficient approach, of course, is to ask the manufacturer exactly what coding and sample rate are required.
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| · | The file is playing right, it is understandable and at the right speed but there is a short noise burst at the beginning of every file. This means that both the correct coding algorithm and sample rate were used but the wrong file format. One is probably playing a file in one of the file formats that have a file header at the beginning while the application expects a headerless file.
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| · | If you are unsure about the file format a particular platform needs, it may be useful to take a sample file (known to play correctly on the platform) and to bring it over to the PC where Vox Studio is installed. Then it is usually easy to identify the format of that file by playing it using Vox Studio. Use the same format for making new files.
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