Embedded white noise to recording audio

Audacity 3 Help Forum
1

I need to use white noise with different dB (45dB, 50dB and 55dB) and embedded with recorded audio (voice). Please teach me how?

I try to record voice and generate white noise. but when set 45dB. it was too loud.
So I got confuse what is amplitude? and suitable frequency should use.

2

If you’re trying to replicate the hiss noise generated by electronics, it’s closer to pink noise than white noise … https://manual.audacityteam.org/man/noise.html#Pink

3

Record your voice track.
Add an empty track. Select the part of that track where you want noise at, say, -45dB.
Generate white noise with the amplitude setting at 0.01 [*]; you will find the duration automatically set to the length of your selection.
The noise will be automatically mixed with the voice when you export the track.

  • 0.01 corresponds to about -45dB RMS for white noise, or about -52dB RMS when generating pink or Brownian noise. Try out other values for your noise and measure its value with Analyse\Measure RMS. When you are satisfied, you can save settings for use in future.
4

If you are talking about digital dB levels (dBFS) those numbers should be negative and a bigger negative number is quieter.

If you’re talking about acoustic dB levels (dB SPL = loudness in the air) they would be positive numbers.

That would depend on what you want, and the purpose. :wink: Normally we want to minimize noise.

You can set the peak level of the noise with Effect → Volume and Compression → Normalize, or you can set the RMS or LUFS loudness with Effect → Volume and Compression → Loudness Normalization.

Note that the perception of noise depends on the Signal-to-Noise Ratio (where the signal is the voice recording.) The noise will sound worse with a quieter signal, or during silence. And during “silence” (noise only) it will depend on your volume control setting, etc.

When you generate noise, an amplitude of 1.0 represents a peak of 100% = 0dBFS.