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Topic: Safe DSP configurations (Read 2076 times) previous topic - next topic
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Safe DSP configurations

I have played around with numerous amounts of different configurations from the default IIR Filter to mass amount of Impulse Response files such as oxfiat-eq and Manley Massive Passive. Now I finally found a configuration that I seem to have the best sound possible with my "MGA SPEAKER SYSTEM M-2220 (3way Acoustic Suspension) [REALLY old speakers btw]" along with a desktop size Ensemble speaker for center, and small Bose speakers as my rear for total surround sound.

Under DSP I have placed in order:

1. Resampler (SoX) mod2 resampling 44100;48000 to 192000 (because it decreased the bass I upsampled which made it sound a lot cleaner)
2. IIR Filter Low Shelf @ 400hz/10db Gain
3. IIR Filter RIAA/Vinyl De-emphasis @ 400hz.

What is the main purpose of De-emphasis? Is this a safe setup or am I destroying my sound files (mp3, FLAC, WAV)?

Safe DSP configurations

Reply #1 –
Quote from: SoberWarlock on
What is the main purpose of De-emphasis?
Wouldn’t that be a good thing to know before you activate it?

As often, Wikipedia to the rescue:
• “[D]e-emphasis is the complement of pre-emphasis”
• “[P]re-emphasis refers to a system process designed to increase (within a frequency band) the magnitude of some (usually higher) frequencies with respect to the magnitude of other (usually lower) frequencies in order to improve the overall signal-to-noise ratio by minimizing the adverse effects of such phenomena as attenuation distortion or saturation of recording media in subsequent parts of the system. That is the mirror of the deemphasis. The whole system is called emphasis.”

Safe DSP configurations

Reply #2 –
I see. No wonder why I have noticed the bands to the left part of Foobar's Spectrum increased. But by increasing it will it destroy my sound files? I've tried other configurations and so far i've I think de-emphasis is the only one that I can noticeably see change in.

Safe DSP configurations

Reply #3 –
How would it destroy your sound files? DSPs are applied in realtime to the outgoing audio stream (in RAM), not to the original data in the file.

So, by all means, use whatever you want—if, for whatever reason, you think it sounds better. But it’s always good to know what you’re doing, and why, first!

Safe DSP configurations

Reply #4 –
For the filter definitions: http://en.wikipedia.org/wiki/Filter_design

Audio DSP pipeline is like: files -> decoding -> ReplayGain/dithering/whathaveyou -> DSP/resampling -> output/output resampling then output. Output files are not tainted at all. Unless you use the convertor to save the results, that is.