Hi
I too misread the original posting and thought the objective was to move the source further away, which could start with lowpass filtering, the slight addition of reverb and cross-channel delays.
The opposite, bringing the sound ‘closer’, I have done using a multi-band [4 bands in this case] expander, and eq. I needed to remove reverb and brighten the signal. Brightening was done use a 31-band graphic eq. A multiband fully parametric eq would also be a good place to start.
Using the multiband expander, I started by setting the expansion thresholds at around -15db — source dependent, with a 1:1.5 expansion ratio, and a second threshold at around –25dB with a 1:3 expansion ratio. The bandwidths of the expanders, the thresholds, and the expansion ratios were adjusted by ear.
While the sources had been acoustic, they had all been significantly processed and mixed. The audio needed to be cleaned up because the file was to be played back in a space with considerably greater reverb time than expected.
Kevin
Dear Askan, Adding to Lorenzo’s response, in addition to needing information on how you intend to present the sound (monaural/binaural, speaker/headphones) it depends on how close you are try to make the sound feel, and finally what the sound is. There can be spectral tilt (ration of high to low frequency components) that change with distance. This depends again on how close, and what the sound content is. As an example, make a quick recording of a similar type of natural sound at 10m then 10cm. You can compare the spectra to get a rough estimate of the correction EQ. For binaural, there are several useful cues like distance/frequency dependent head shadowing and auditory parallax. For distances <1m, these are modelled rather well in our research based free binaural VST plugin http://anaglyph.dalembert.upmc.fr/. Give it a try. -Brian -- Brian FG Katz, Research Director, CNRS Groupe Lutheries - Acoustique – Musique Sorbonne Université, CNRS, UMR 7190, Institut Jean Le Rond ∂'Alembert
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