Search found 7 matches

by PatMcGee
Mon Aug 15, 2011 3:08 pm
Forum: Mac OS X
Topic: Making bit-exact WAV file copies of DATs
Replies: 12
Views: 3892

Re: Making bit-exact WAV file copies of DATs

Success at last! I poked around in Audacity for other things I could change. In the Quality tab, I changed the Default Sample Format from 16-bit to 32-bit float. When I exported two different recordings of the same tape to 16-bit WAV, I got two bit-identical files (after I trimmed off the leader and...
by PatMcGee
Sun Aug 14, 2011 4:51 pm
Forum: Mac OS X
Topic: Making bit-exact WAV file copies of DATs
Replies: 12
Views: 3892

Re: Making bit-exact WAV file copies of DATs

Hi Koz, OK, sorry, I wasn't reading right. Yep, I certainly understand the environment that Audacity works in and the limitations that come from that. Thanks to you and Bill, I now understand more about what's going on. I think my only lack of understanding now is why the mk II shows a certain error...
by PatMcGee
Sun Aug 14, 2011 4:38 pm
Forum: Mac OS X
Topic: Making bit-exact WAV file copies of DATs
Replies: 12
Views: 3892

Re: Making bit-exact WAV file copies of DATs

Hi Bill, Thanks for the comments. I like your list. I think sources 1-5 in your list are unlikely in this case, mostly because the errors always show up in the low order bit(s) and random errors in those places would probably show up as errors in all the bits, not just the low-order ones. I also tho...
by PatMcGee
Sun Aug 14, 2011 6:05 am
Forum: Mac OS X
Topic: Making bit-exact WAV file copies of DATs
Replies: 12
Views: 3892

Re: Making bit-exact WAV file copies of DATs

Hi Koz, I'm not sure that I understand your last comment. I think what you're saying is that, when I use Audacity to record the same DAT twice with dithering off, I should indeed expect to see two bit-identical files. When I combine that with Bill's comment, I should see differences when the tape ha...
by PatMcGee
Sun Aug 14, 2011 5:44 am
Forum: Mac OS X
Topic: Making bit-exact WAV file copies of DATs
Replies: 12
Views: 3892

Re: Making bit-exact WAV file copies of DATs

Bill, thanks for the clue. I did some checking and found out a lot that I hadn't known before. It was an interesting journey, but in the end, I think it doesn't solve the problem. It turns out on the DA-20 Mk II, there's a way to display the error rate on the front panel. According to the manual, th...
by PatMcGee
Sun Aug 14, 2011 3:20 am
Forum: Mac OS X
Topic: Making bit-exact WAV file copies of DATs
Replies: 12
Views: 3892

Re: Making bit-exact WAV file copies of DATs

Major progress, but not total success. Thanks, Koz. Argh! I thought I had set dithering to None, but when I looked closer, I found it in two places on the Quality panel. I've now got both set to None, not just one of them. Now, instead of every sample differing by 3-4 or so, I see every second or th...
by PatMcGee
Sat Aug 13, 2011 10:15 pm
Forum: Mac OS X
Topic: Making bit-exact WAV file copies of DATs
Replies: 12
Views: 3892

Making bit-exact WAV file copies of DATs

I'm trying to make bit-exact WAV file copies of a bunch of DATs. So far, I haven't succeeded. I record a DAT using Audacity, then trim off the leader and trailer and export it to a WAV. I record the same DAT again, trim to the same spots relative to the music and export as a WAV again. When I compar...