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True Voltage level from dB in Audacity?

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faisal349

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Hi,

I generated a linearly frequency modulated signal (40kHz-45kHz) in Audacity software with an amplitude of 1. Ideally, the gain should be 0dB in this frequency range. But, when I use the Plot Spectrum option in Audacity, the gain is not 0dB but less. And as I increase the size e.g. from 1024 to 65536, the gain further reduces. What is the reason for it? I think it is divided by the size of the window, that is why the gain reduces?

How can I extract the true voltage level from the Plot Spectrum option in Audacity or MATLAB etc?

Regards
 

What are the values shown?

dB is a relative measurement. You would need to know what 0dB corresponds to in terms of Voltage. This makes sense as you could play the same song on a wide variety of audio equipment all with different output capabilities.
 

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