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In Reply to: one could imagine a digital XO posted by Mart on July 1, 2001 at 05:46:43:
I skimmed through Tripath's application notes and there's no hint as to sample rate or sample size. The documentation is rather vague; they consider the details proprietary.The cancellation of jitter when a common clock is used for both A/D and D/A is possible only if the system is not pipelined (unlikely). All DSPs use pipelining, meaning that there may be hundreds of clocks of delay between the input and output. Using a common clock won't help since the input and output are skewed in time.
A digital XO can be a very good thing since zero phase shift is possible. This is realized by applying the same pipeline delay to both high-pass and low-pass sections. I think the problems people encounter with "subwoofer lag" are mainly caused by phase shift in the crossover. At a crossover frequency of 50Hz, one can expect several milliseconds of delay, enough to upset the rhythm of the music. Digital XOs can fix this.
Ed
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Follow Ups
- sample rates, jitter, and digital XO - EdG 07/1/0110:12:03 07/1/01 (10)
- jitter, TriPath sw. frequency, energy storage & DSP filters - Arbelos 18:59:03 07/1/01 (8)
- DSP filters - EdG 20:57:50 07/1/01 (7)
- not clear how you decide that the filters are at fault, care to expound? <nt> - Mart 00:25:33 07/3/01 (1)
- its a guess - EdG 09:40:44 07/3/01 (0)
- Re: DSP filters - Arbelos 04:30:38 07/2/01 (4)
- beauty & the beast - Mart 00:20:59 07/3/01 (2)
- Minidisc does something similar - EdG 09:09:12 07/3/01 (1)
- you would think it'd employ fuzzy logic - Mart 09:55:57 07/3/01 (0)
- steep filters and CD - EdG 10:54:35 07/2/01 (0)
- true but ironic - Mart 10:35:51 07/1/01 (0)
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