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Convert/Transform Active defaults
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| · | Resample prompt: set the default to modify the sample rate of the file, i.e. the number of signal measurements performed per second. The Nyquist theorem states that the highest frequency component in any sound file cannot exceed 1/2 the frequency at which the file is sampled; remember that when you set your defaults. You can select any of the "standard" telephony or multimedia sample rates from a list, but you can also input a custom "nonstandard" sample rate if you need to.
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| · | Trim leaders and trailers: sets the defaults for trimming leading and trailing blanks.
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| The dialog box allows you to select the threshold level Vox Studio uses to detect the difference between silence and non-silence. The threshold level can be set as either a percentage of the maximum on-screen amplitude or as a threshold value in dB, dBm or dBV. Don't set the threshold lower than your background noise level, or nothing will work.
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| The default silence duration itself is also defined here. A reasonable typical value would be 300 milliseconds.
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| · | Normalize sound volume: sets the default maximum sound energy for normalization. The selection can be done in % of the maximum on-screen amplitude, in dB or in dBm/dBV. Vox Studio does not measure peak AMPLITUDE, it measures peak ENERGY over a duration of several milliseconds (about the duration of a spoken syllable). Usually a choice of about 65% of maximum energy will be fine.
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| Remember that you can also enter values in decibels and that Vox Studio's dBV or dBm display can be calibrated.
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| · | Center around zero: if this is set here, then centering will be activated by default in the conversion dialog boxes. Disable it here if you usually will not use this feature.
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| · | Intelligibility filter: if this is selected here, then the Intelligibility Filter option will be activated by default when initiating the Transform Active and Convert Active commands. You can also select the default Clarity Filter and Boost options here. Usually a "weak" clarity filter and "no boost" is the best choice.
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| · | Low- and high-pass filter: if this is selected here, then the low- or high-pass filter options will be activated by default when initiating the Transform Active and Convert Active commands. For the high-pass and low-pass filters the -3 dB cut-off frequencies can be chosen with a 1 Hz resolution. Remember that according to the Nyquist theorem the highest frequency component in any sampled file cannot exceed 1/2 the frequency at which the file is sampled. You do not need to activate this option for sample rate conversions because Vox Studio does all the necessary associated filtering automatically.
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| · | DTMF filter: if this is selected here, then the DTMF filter option will be activated by default when initiating the Transform Active and Convert Active commands. The DTMF filter has 3 strengths you can choose from: "weak" attenuates 10 dB, "medium" attenuates 20 dB, and "strong" attenuates 30 dB. Use the weakest filter that solves your talk-off problems.
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