Measurements of the true inter-sample peak levels are notated as dBTP or dB TP ("decibels true peak"). This can be prevented by careful digital-to-analog converter circuit design. Conventions differ for root mean square (RMS) measurements, but all peak measurements smaller than the maximum are negative levels.Ī digital signal that does not contain any samples at 0 dBFS can still clip when converted to analog form due to the signal reconstruction process interpolating between samples. For example, a signal that reaches 50% of the maximum level has a level of −6 dBFS, which is 6 dB below full scale. The level of 0 dBFS is assigned to the maximum possible digital level. The unit is similar to the units dBov and decibels relative to overload ( dBO). The red lines indicate full scale, and the waveform is shown before and after hard clipping (grey and black outlines respectively).ĭecibels relative to full scale ( dBFS or dB FS) is a unit of measurement for amplitude levels in digital systems, such as pulse-code modulation (PCM), which have a defined maximum peak level. For other uses, see DBFS (disambiguation).
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