![]() ![]() The "decibel" is technically one tenth of the unit "bel," although the "bel" is rarely used. The bel is named in honor of Socttish-American scientist and inventor of the telephone, Alexander Graham Bell (1847-1927) 2. Decibels 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. This is useful in medical ultrasound since the difference in intensity between a transmitted ultrasound beam and a returning echo can be six orders of magnitude different. The red lines indicate full scale, and the waveform is shown before and after hard clipping (grey and black outlines respectively). RatiodB 10log 10 ( P1 / P0) Amplitude ratio The ratio of quantities like voltage, current and sound pressure level are calculated as ratio of squares.
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