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Curious that its got a nonstandard 46.875 kHz samplerate rather than 44.1 or 48.0 kHz. Not that it matters since its only output appears to be on the analog si
by driggs 3y ago
Curious that its got a nonstandard 46.875 kHz samplerate rather than 44.1 or 48.0 kHz.
Not that it matters since its only output appears to be on the analog side of the DAC.
This is a surprisingly well-featured sampler/sequencer for the price!
- porkloin 3y agoYeah, very weird. They have a sample prep tool that converts existing samples to the correct format, and obviously the internal sampling records to that rate.
- MrBuddyCasino 3y ago"93.75kHz and 46.875kHz are the sampling frequencies Bruno Putzeys uses in all his digital products for Hypex, Grimm audio, KII, etc.", as outline here[0], for the following reason: 5.2 Clock The clock circuit is the same as that used in the CC1 except that the sampling rate is set to 93.75kHz instead of one of the more traditional audio rates. This is specifically done to improve the performance of the SRC chip. An uncommon clock frequency reduces the odds that mix products between the incoming clock and the internal clock fall inside the PLL loop bandwidth of the SRC. [0] https://www.audiosciencereview.com/forum/index.php?threads/why-93-75-khz-sampling-rate.4309/#post-98746 https://www.audiosciencereview.com/forum/index.php?threads/w...
- driggs 3y agoOK, you've pasted from the #1 Google result after searching for "46.875 kHz samplerate". What does this have to do with the Teenage Engineering EP-133? It doesn't have USB audio or SPDIF, so no standard samplerate clock to conflict with.
- MrBuddyCasino 3y agoIt does have DACs, that presumably operate at the standard frequencies.
- driggs 3y agoThe ADC and DAC operate at 46.875 kHz, its samplerate. That's the entire point of my original comment about it being nonstandard.
- CamperBob2 3y agoThe thing is, if the sample rate matters with respect to anything other than the Nyquist limit, your filtering isn't good enough. Relying on spacing between sample clock harmonics to keep beatnotes out of the passband isn't great engineering practice. I have to do that in a relatively-exotic RF application, admittedly, but I wouldn't advertise it as a feature. :) And I'd never choose that approach at audio frequencies. There's just no need.
- driggs 3y agoThe concern isn't about the trivial difference in Nyquist frequency, it's about aliasing and dithering when importing/exporting/synchronizing digitally. 1 sample from the EP-133 is 1.0629251700680271 samples at 44.1kHz, or 0.9765625 samples at 48kHz. (But, again, it doesn't export/synchronize audio digitally, so it probably only matters if directly importing samples.)
- tecleandor 3y agoIt might be because of the clock of the CPU or the dac being 24Mhz. 24MHz/512=46.875KHz Edit: or 12, 6, 3... 24MHz/512=46.875KHz 12MHz/256=46.875KHz 6MHz/128=46.875KHz 3MHz/64=46.875KHz...
- duped 3y agoI've heard Lexicon used to use weird sample rates in its reverbs to make it harder to reverse engineer.
- lukeh 3y agoIt may have to do with part availability during the pandemic, perhaps?