Once I had a process down i was able to repeatably make mp3 files that played from an iPhone 6 using audacity and a that Thinkpad laptop.
Using a dedicated TASCAM recording device was easier and reliable but those are expensive. My only problem is I didn't have much use for it. It's cool to be able to bootstrap TEENY but other than that it's generally easier for me to use REX + TSDOS + laddiealpha. -- John. On Mon, Oct 1, 2018, 6:51 PM Stephen Adolph <twospru...@gmail.com> wrote: > This subject always interests me. But it is frustrating. > > I've been playing around with the files on Sonora.us. awesome effort to > put that together! I do have some comments though. > > 1. The audio files don't work for me in any scenario so far. I believe > that at least some of them are distorted. I have not looked at them all. > When I compare the signals generated by an m100 to the audio files using a > scope there is a really big difference. > > 2. As an aside I found that my pc audio output had a DC offset! That was > really hard to work with. I has to make a cable with a series capacitor to > get the setup to work at all > > 3. Once I obtained *good* sample files, the number one determinant of a > successful readback is drive signal level . Only my PC seems to be able to > generate enough swing. > > 4. Wav vs mp3. Both are usable. Once all the issues have been sorted > these two file types seem to work equally well. Mp3 a lot smaller!! > > 5. T200 is pretty robust and not sensitive to volume that much. T102 > seems to be more sensitive while m100 seems on the edge of working at all. > Maybe it is specific to my machines. All the circuits are the same on the > schematic so I have no explanation. > > 6. I use LINE IN for sampling and LINE OUT for playback on the PC. > > 7. I amplify the sample files to maximum in the audacity effects menu. > > 8. None of my portable devices Samsung s8 old Sony expedia nor my mp3 > player have enough drive signal to be reliable. > > > I hate to say it but i believe that the files on the site may need to be > resampled. I think the approach of sharing the files over the net is fine > but the audio files should look like a low pass filtered square wave. I > can send traces of M100 actual output of anyone is interested. > > Anyhow that is where I got to. I still don't have a reliable working > portable solution for cassette audio. > > Anyone out there having a different experience? > > > Steve > > >
