2024年1月26日 · dB SPL is a pressure measuring unit. You can't convert a voltage to a dB SPL reading unless you know: the microphone sensitivity (or simply the analog output voltage to the input pressure ratio) which tells you essentially the voltage level it will output for a given sound pressure level; the gain that the preamp has applied

2015年6月5日 · The non-linearity in the system will be known to the designers, and they will account for it when they calculate the SPL in code. Further, you can't just convert between A, C, flat, or whatever SPL weighting. If you look at the Fletcher-Munson curves, they are frequency and SPL dependent. \$\endgroup\$ –

2020年2月4日 · Single A-weighted dB value for sound pressure level cannot be undone to unweighted dB value because the single value does not include information about which frequencies exist in the measurement to undo the weighting.

2015年6月12日 · Is there one with values for 3000 Hz and 6000 Hz (and as many other values as possible)? I know it is not possible to convert between dB A and dB SPL, but I am trying to look for a table of corresponding values. Since Z-weighting subtracts 0 every time, a highly detailed A-weighting table would be good too.

2021年8月3日 · I am using headphones with sensitivity 102 dB SPL / 1 Vrms with impedance of 300 ohms. For a particular volume knob setting on my sound card embedded with a headphone pre-amplifier, I would like to determine the output in dB SPL from the headphones. I played out a calibration tone of 1 kHz of peak amplitude 1 V (RMS 0.707 V).

Volts into dB SPL explained . In the first article, during the dB SPL calculation the reference Voltage used is the microphone reference voltage, 0.005012 V RMS (microphone sensitivity of -46dBV/Pa , this gives 0.005012 V RMS) , which I thought is correct and made sense. However in the second article, he uses a relative voltage of 1V during the ...

2015年1月16日 · To relate the finished SPL value in internal logarithmic units to dB SPL, we have to note that the microphone data sheet claims that a 1 kHz tone at 94 dB SPL will typically register as -26 dB FS, where 0 dB FS is largest amplitude sine wave that can be represented in a PCM sample without clipping.

2021年4月20日 · The definition of dB SPL is the 20 log of the ratio between the measured sound pressure level and the reference point is defined as 0.000002 Newtons per square meter, the threshold of hearing.

2017年5月2日 · The INMP510 microphone sensitivity is -38 dBV with a sound pressure level of 94 dB at 1 kHz. -38 dBV is 12.6 mV RMS. So if you measure 12.6 mV RMS then your SPL is 94 dB. If you measured twice that voltage then your SPL will be 6 dB higher. If you measured half the voltage your SPL would be 6 dB lower.

2019年7月15日 · A jackhammer at 1m distance produces 100dB-SPL, and hearing damage occurs over 85dB-SPL. So 94dB-SPL is far above the maximum sound level that the microphone will likely be used for. A more reasonable maximum would be 74dB-SPL. If your mic+amp produces -40dBV from 94dB-SPL then at 74dB-SPL you get -40-(94-74) = -60dBV.