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yodrez · Posted - Wed Mar 26, 2003 11:38 pm

Newbie here, with what might be a too-basic question. If so, please help me find the correct forum for an answer.

When recording programs from NPR, frequently the signal is dropped 50 minutes into the 60-minute broadcast. Rather than start again from the beginning, I'd like to (re-)download only the last segment of the program and have CE2000 match and mix the two waveforms by overlapping them at the appropriate place.

I'm probably looking in the wrong places, but I haven't been able to find a method to do this.

Any help? TIA.

Dan Dresner

Mark T · Location: Norway

Hi,

I have absolutely no idea what NPR is, but if you can identify a common point in each waveform, you should have no trouble cutting off the overlap (at a zero crossing) and then aligning them seamlessly in multitrack (check there is no "pop" at the join), you can then mix them down to a new single track for burning or whatever one does with NPR programs:D

Good luck!

RossW · Location: USA

If I understand correctly, you should be able to use the "Mix paste" function to overlap the two recordings... but depending on what the content is, you may have to spend a bit of effort to get each lined up correctly, and then adjust the proportions of each. You may have to do some volume adjustments afterwards as well. It might be easier to just try to butt edit the two pieces together more like Mark has suggested... even without multi-track. (You don't say whether you have CE Pro or CE2000 with/without multi-track option.) Obviously, if you find a momentary silent pause in the program, that would make a very good edit point.

And for Mark: NPR = National Public Radio, the US listener-funded non-commercial radio network. You can check them out at www.npr.org if you want to hear the variety of programs offered.

yodrez · Posted - Thu Mar 27, 2003 10:01 am

Many thanks to you both for such a helpful response to my post, but it looks like I'm out of luck.

I was hoping that the program would be able to find the identical segments of the two portions and do the overlapping for me. From a programming standpoint, it would seem to me to be a trivial coding problem: the program identifies x seconds of the beginning of the second wave and then searches backwards from the end of the first wave for an identical pattern. When it finds it, the program then cuts the rest of the first wave and tacks on the second wave. As an enhancement, the user could be allowed to set the parameters for looseness of the match. In my case, the recording is always speech rather than, say, drum beats (which would result in ambiguous matches). The end of the first piece is "broken"; the second section starts before the broken part of the first piece. Since the two waveforms are parts of the same broadcast, it should be easy for code to perform the matchup.

I have to assume, however, that mine is a very unusual need, or Syntrillium would have already come up with a module for this.

Anyway, thanks for the input, folks.

--yodrez