What happens with recorded speech if speaker is at distance with possible acoustical obstacle in between

[Robert Rozman]

Hi,

I'm looking for more informations about how recorded speech changes if
speaker is in same room, but at a distance of few meters. Also I'm
interested how recorded speech changes if there is acoustical obstacle
between speaker and microphone. I know that reverberation effect appears,
but I'm also interested if spectrogram changes in any other way.

I've read somewhere that high frequencies are attenuated in such scenarios,
but would like to read some more in depth analysis or article about that ?

Thanks in advance,

regards,

Rob.