#Audio decibel convert to linear scale software#

#Audio decibel convert to linear scale software#

I've measured this with a Larson Davis SLM and AUDit software and it works. While I'm not converting a value from one decibel scale to another, I'm applying the same offsets to values in different scales and thus the *effect* to both is the same. I apply -25 dBFS to the dBFS value that drove 70 dBHL during calibration. What youre measuring is dBFS (decibels full-scale, I think). If youre trying to measure the actual Sound Pressure Level or SPL, you would need to calibrate. Let's say I need to play back (a pure tone) at 45 dBHL. I think Yann means that Decibels are a relative scale.

Then, to playback at an arbitrary dBHL as perscribed by ANSI/ISO/OSHA standards, I can find the offset from 70 dBHL and apply the same offset to the value in dBFS that drove 70 dBHL. This function converts the linear relationship between two voltages or powers into decibels, and decibels in power or voltage gain or attenuation. Instead, you want to convert the magnitudes to decibel (dB) units in a numerically stable way. But that might get you into trouble because log(0) is undefined. One way to do that would be taking the log of the mel-spectrograms. Formulas for decibel to field and power ratio conversions and. So, in this last step, we want to scale the mel-spectrograms’ magnitudes logarithmically, too. I can calibrate the device to know which amplitude FS would correspond to 70 dBHL (where it seems all calibration is typically done to block out ambient noise). Decibel (dB) converter for dB to magnitude conversion and multiplication of dB by a number. It is misleading to compare the decibels of the underwater sound with the decibels of sounds heard in the air. Therefore, 62 dB must be subtracted from a sound level in water to produce an equivalent acoustic intensity in air. This doesn't make any sense really and only sort of worked. Combining these two values, a 26 dB + 36 dB 62 dB difference, or correction factor, between the two scales is required. It has the best perceptual friendliness: sliderpos 2. Recommendation: dont use linear, dont use dB use power scale. If you use a decibel scale, youll have to constrain the scale to -x dB, cannot achieve 0 volume fail. My problem was that I was mixing up needing an 'amplitude' in 0-1 (which can of course be converted to decibels on 'full scale' or FS) to set for playback 'volume' etc and thus was converting dBHL values to amplitude (which really is 'amplitude HL' values) and normalizing by the max dBHL value that the device could output for some specific transducer/earphones. If you use a linear scale for mapping slider position to, the dB steps near 0 are too big fail. For completeness' sake, I did finally figure this out.