22906
100+ Head-Fier
- Joined
- Feb 24, 2005
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Hello Head-fi; I'm back. This time to advance my views on phase linearity in the audio signal chain.
1. Only planar transducers (or phase-linear transducers) should be used in audio
2. Digital filters are completely unnecessary and counterproductive to hi-fi reproduction
3. The maximum number of analog filters that should be used is one, and that is directly after the microphone, and only if the microphone's frequency response extends past half of the sampling frequency; and if it used, it must be phase linear
4. Once the phase of the signal has been altered, it is non-trivial to revert the signal to the original condition; preserving the original phase of the signal should be of the greatest priority in designing audio systems
This is assuming all of my arguments in my other thread, Hi-fi Audio signal chain, are true
After reading this about audibility of phase shift:
http://www.audioholics.com/room-acoustics/human-hearing-phase-distortion-audibility-part-2
We need to apply basic philosophy of science to hi-fi audio. It is generally impossible to "prove" a scientific theory with an example, but it is possible to disprove one. This is in contrast to mathematical theories. Audio reproduction is a scientific field, so even if many people cannot hear phase differences, engineering decisions should not be made based on pseudo-scientific claims, but rather err in the way of greater caution, and theoretical optimality wherever possible. This means "making it sound good" takes second priority to phase linearity, DC linearity, and frequency response. I look forward to the discussion. I won't be responding at all this time.
1. Only planar transducers (or phase-linear transducers) should be used in audio
2. Digital filters are completely unnecessary and counterproductive to hi-fi reproduction
3. The maximum number of analog filters that should be used is one, and that is directly after the microphone, and only if the microphone's frequency response extends past half of the sampling frequency; and if it used, it must be phase linear
4. Once the phase of the signal has been altered, it is non-trivial to revert the signal to the original condition; preserving the original phase of the signal should be of the greatest priority in designing audio systems
This is assuming all of my arguments in my other thread, Hi-fi Audio signal chain, are true
After reading this about audibility of phase shift:
http://www.audioholics.com/room-acoustics/human-hearing-phase-distortion-audibility-part-2
We need to apply basic philosophy of science to hi-fi audio. It is generally impossible to "prove" a scientific theory with an example, but it is possible to disprove one. This is in contrast to mathematical theories. Audio reproduction is a scientific field, so even if many people cannot hear phase differences, engineering decisions should not be made based on pseudo-scientific claims, but rather err in the way of greater caution, and theoretical optimality wherever possible. This means "making it sound good" takes second priority to phase linearity, DC linearity, and frequency response. I look forward to the discussion. I won't be responding at all this time.