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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: How does what you say apply to digital increases ? posted by GGA on February 9, 2007 at 08:37:20:
Increasing the volume of a digital signal is less lossy than decreasing it, the multiplication rule still applies, however since your output is larger than your input you gain one bit of resolution as you pass the bit transition at +6.02db, 2 bits at +12.04db ect... There is one significant problem tho, if any output sample exceeds the bounds of the digital output format it is clipped to the maximum (or minimum). This appears as a hard clip similar to overdriving a transistor amplifier. As most recordings are purposefully recorded close to full scale to extract the maximum performance from the A/D converters they were recorded with there is usually very little space available for increasing the level of a digital signal before it clips. You can attempt to decrease the audibility of a clipped digital waveform by soft limiting the clipped portions which creates a rounded clipped waveform similar to an overdriven tube amplifier, however there is still significant distortion added. Therefore it is best not to attempt any digital volume increase unless you know the exact form of the input signal and are confident it will not clip.If you require amplification it is best to apply it in the analog domain after the DAC (or in the DAC itself with some designs.) Then you can use digital attenuation which has no chance of clipping.
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Follow Ups
- Re: How does what you say apply to digital increases ? - DJS 19:41:27 02/09/07 (0)
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