by Chris » Mon Nov 05, 2018 2:04 pm
DOOMGABR [RU] wrote:I am sure that GZDoom's filters are applied automatically to sounds with specific parameters (format, bit rate, frequency), aren't they?
They are filtered according to the resampler option. The default is linear interpolation, though the most true-to-source method OpenAL Soft has available is 23rd Order Sinc. But since the sounds are only 11khz to start with, there is no high frequency content and the better resamplers will make it sound muffled. The linear and nearest resamplers add noise to the sounds as a result of inaccurate sample reconstruction, which may or may not sound good depending on your preferences. The only way to truly improve the sound quality is to go to the original high-fidelity recordings, before they were down-sampled to 11khz.
Per Kristian did that and made a mod for it.
For Doom 3 sounds, since they're 22khz they already start with twice the frequency content as the original Doom sounds. The resampler has less to add, so it adds less noise (and the more true-to-source resamplers will sound less muffled). But similar to Doom, the only way to truly improve the sounds is to get the original high-fidelity recordings from before they were down-sampled to 22khz.
[quote="DOOMGABR [RU]"]I am sure that GZDoom's filters are applied automatically to sounds with specific parameters (format, bit rate, frequency), aren't they?[/quote]
They are filtered according to the resampler option. The default is linear interpolation, though the most true-to-source method OpenAL Soft has available is 23rd Order Sinc. But since the sounds are only 11khz to start with, there is no high frequency content and the better resamplers will make it sound muffled. The linear and nearest resamplers add noise to the sounds as a result of inaccurate sample reconstruction, which may or may not sound good depending on your preferences. The only way to truly improve the sound quality is to go to the original high-fidelity recordings, before they were down-sampled to 11khz. [url=http://www.perkristian.net/game_doom-sfx.shtml]Per Kristian did that and made a mod for it[/url].
For Doom 3 sounds, since they're 22khz they already start with twice the frequency content as the original Doom sounds. The resampler has less to add, so it adds less noise (and the more true-to-source resamplers will sound less muffled). But similar to Doom, the only way to truly improve the sounds is to get the original high-fidelity recordings from before they were down-sampled to 22khz.