As with the differences between wav and mp3, 16 bit vs 24 bit is often difficult to identify by listening.
If the clip is properly dithered, this doesn't really prove much of anything other than the dithering did its job. The whole point of dithering is to make the resultant 16-bit file sound as much like the 24-bit version as possible. A better real-world test would be to record two different multi-track sessions, one in 16 bit and one in 24 bit. You would still have to dither the final mixes, but the difference, especially if there was some degree of processing, should be quite distinguishable.
QuoteAs with the differences between wav and mp3, 16 bit vs 24 bit is often difficult to identify by listening.Really? With a good set of speakers, I think most mp3's are relatively easy to identify...
Welcome to HA. I see this is your first post. Can I suggest that you read the Terms of Service, especially number 8.
If you do indeed find the majority of mp3s easy to identify in a proper double blind test, then you should contribute to some of the encoder development and testing that goes on around here.
The only sources I have to record at 24 bit are already existing recordings on vinyl, tape, and CD. Those are not good candidates for the obvious reasons.
Just to reiterate, this post is not about theory. It is an inquiry about what people have experienced. Has anyone been able to do a valid ABX test? Is so, on what?
I think it's a good idea to mention the importance of the sampling rate when we talk about the audibility of quantization noise. For example you can use a 16/96 setup to get a similar SNR performance compared to 24/48 in the audible frequency range (by use of clever noise shaping filters) plus a flat response upto 40 kHz. In this case 16 bit would be more than enough for distribution.
Even a simple 4th order IIR filter can lower the noise floor about 20 dB below 0.4 times the nyquist frequency -- in case of 96 kHz that'd translate to a 20 dB increase of the dynamic range below 19,2 kHz (and a 20 dB decrease above 28.8 kHz but that shouldn't bother anyone)
First you would have to demonstrate the audibility of quantization noise in 16 bit/44.1kHz stuff to find any excuse to go to a higher sampling rate.
QuoteEven a simple 4th order IIR filter ...I don't know what you are writing about. What are the parameters of such a filter (filter variety, cutoff, highpass/lowpass/band pass/, transition bandwidth, etc)? What is it filtering out? Is it hardware or software? Where might it be employed? If it does something useful, why is it not in normal use?
Even a simple 4th order IIR filter ...
sos = [ 1.0 -0.6160081826103387 0.7225 1.0 0.8253356149096804 0.25 1.0 -0.8253356149096804 0.25 1.0 0.6160081826103387 0.7225 ];[b,a] = sos2tf(sos);freqz(b,a);