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Originally Posted by Andy Krehm  So just for clarification, you are saying that one can go from 48k to 44.1k or 96k to 44.1k without dithering as long as the bit rate stays the same, i.e., keeping 24 bits with the examples above.
I was told by the owner of a well known, high end company that sells harware and software SRCs that you have to apply dither when sample rate convering and offerred to refer me to some "white papers" on the subject. I just took his word for it but may it's not so cut and dried.
So what is the "truth" here? |
Hey Andy, there is a couple of 64bit float SRC's available which allow the wordlength to grow with sufficient headroom during the SRC. I guess it really depends on the output file resolution as to whether you would need to dither. If you are outputting to a 24bit file it might be wise to use a type 2 TPDF dither. If you are outputting to a 64bit or 32bit file then I can't see there being any point in dithering. I usually use a 32bit 96kHz file & capture at 32bit 44.1kHz then dither that to the target rate (either 24bit or 16bit). If using Waveburner to compile the disc I usually dither to 24bit so I can do fades etc & then output with 16bit MBIT+ dither on bounce project.