Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!gatech!gitpyr!byron From: byron@pyr.gatech.EDU (Byron A Jeff) Newsgroups: comp.dsp Subject: Re: More digital mixer stuff Message-ID: <9264@pyr.gatech.EDU> Date: 3 Oct 89 17:54:45 GMT References: <9238@pyr.gatech.EDU> <7905@microsoft.UUCP> <9247@pyr.gatech.EDU> <1845@draken.nada.kth.se> Reply-To: byron@pyr.UUCP (Byron A Jeff) Organization: Georgia Institute of Technology Lines: 26 In article <1845@draken.nada.kth.se> d88-jwa@nada.kth.se (Jon W{tte) writes: -In article <9247@pyr.gatech.EDU> byron@pyr.UUCP (Byron A Jeff) writes: ->The only question is what's the sample rate of the mixed signal? It ->would seem to be 8x the original sample rate yes? So for 8 48Khz channels ->I'd need a 384 Khz DAC. Ouch! - -No, not really. You apply a digital filter on the signal, and then use -each eigth sample. Yes, it'll work ! Someone said that you should apply -this BEFORE you fed the signal to the DSP, but then you would have no -channel separation (the channel separatio is in the time domain if you -interleave the samples, and the filter truly messes this up) and all the -channels would come out mixed equally. 'Wow!' he exclaims incredulously. Would you please go into a little more detail on how this black magic works? Also is it possible to scale the samples for individual channel volume control before using the filter? - - h+@nada.kth.se BAJ (the ever amazed) -- Another random extraction from the mental bit stream of... Byron A. Jeff Georgia Tech, Atlanta GA 30332 Internet: byron@pyr.gatech.edu uucp: ...!gatech!pyr!byron