Norval
AVForums Grandmaster
Maybe a stupid question, but could anyone explain to me how digital x-overs work.
I understand the whole concept of digital transmission, PCM, A-D and D-A conversion very well. As a matter of fact, I've been teaching the principles for the past 15 years. To be honest I have not done any research on the topic of digital x-overs yet.
My problem with the concept: The analogue signal that we sample is a complex signal. therefor each sample that we take contains both LF as well as HF information. Once encoded there is no way to determan which part of the sample is HF and wich part is LF. Now maybe with the aid of a DSP, and by looking at a series of samples, it could be determined what the digital context of the LF as well as HF part would look like. This would of course mean that a trancoder is needed to recalculate to sample values for LF as well as HF for each incoming sample values.
Have I got it all wrong, because I cannot see how this could be done without the loss of some detail.
I understand the whole concept of digital transmission, PCM, A-D and D-A conversion very well. As a matter of fact, I've been teaching the principles for the past 15 years. To be honest I have not done any research on the topic of digital x-overs yet.
My problem with the concept: The analogue signal that we sample is a complex signal. therefor each sample that we take contains both LF as well as HF information. Once encoded there is no way to determan which part of the sample is HF and wich part is LF. Now maybe with the aid of a DSP, and by looking at a series of samples, it could be determined what the digital context of the LF as well as HF part would look like. This would of course mean that a trancoder is needed to recalculate to sample values for LF as well as HF for each incoming sample values.
Have I got it all wrong, because I cannot see how this could be done without the loss of some detail.
