After I record audio to the HDR, I noticed the waveforms are not centered on the bi-polar center axis i.e., the waveforms are above or below the center axis. Why?
You have most likely recorded audio with a DC offset. This is normally caused by A>D converters that were not calibrated properly. If you are using outboard converters, simply power-down the converter, and power-up – then check for Offset. You can also toggle the converters sample rate (while not playing audio) but allow the clock to settle a few moments before testing. Many pro converters have a built-in calibration mode. You can export the problem wave files to a third party audio editor such as Nuendo or Logic, and run DC Offset Removal DSP. Note: Most converters calibrate at power-up. A DC offset is usually caused when audio signal is present at the converters input when the converter is powered-up. Be sure not to have audio playing into the converter when you first turn it on.
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