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[Mac Kerr]

Not really.  The lower latency on higher frequency samplerates is usually a function of buffer size on the AD/DA,  basically twice the data of 48khz, half the buffer fill up time.

More than the buffer I think it is how many samples it takes to do the conversion. At 96k those samples go by in half the time.

Mac

[Roland Clarke]

More than the buffer I think it is how many samples it takes to do the conversion. At 96k those samples go by in half the time.

Mac

I think we are saying the same thing?  Conversion is done in real time, but the chip buffers a fixed data amount, more data throughput, (twice the amount at 96 as opposed to 48) half the time.  It’s easily seen when manufacturers produce gear that does multiple sample rates, speed generally halves.

[Andrew Broughton]

My understanding (from my research about external clocks) is that the conversions aren't done at the clock speed, but a multiple of them. Like 4x or 8x oversampling, so even with a console running 48k, the A/D conversions are being done at 192k or 384k, so I don't know that a console that is designed to run at 48k has higher latency JUST because of it's lower clock speed. I don't know for sure, but I think it has more to do with other processing inside the console, not the A/D.

[Roland Clarke]

My understanding (from my research about external clocks) is that the conversions aren't done at the clock speed, but a multiple of them. Like 4x or 8x oversampling, so even with a console running 48k, the A/D conversions are being done at 192k or 384k, so I don't know that a console that is designed to run at 48k has higher latency JUST because of it's lower clock speed. I don't know for sure, but I think it has more to do with other processing inside the console, not the A/D.

It depends.  Some consoles are using fpga’s these process at machine code level and are extremely fast, but programming is far more complex and more so for complex processing.  Avid use a pc board (or at least did on Profile), this would be slower.  That aside consoles/interfaces that offer multiple sample rates working allow you too see what effect the AD/DA conversion is having on latency.  The fact that their published latency figures are close to halved by doubling sampling frequency shows that this is due to buffer speed.  Physical processing for audio, although it can be intense with complex algorithms, appears to be much lighter with eq, compression, gating.  Waves quote many of their processing plugs in the 3 sample range, next to nothing.

[ProSoundWeb Community]