Re: Win11 ??
"David McClain (as dbm at refined-audiometrics dot com)" <[email protected]>
| Newsgroups | gmane.lisp.lispworks.general |
|---|---|
| Message-ID | <[email protected]> |
I have endless difficulties with Apple’s stupid cloud link sharing…. Let’s try again: https://www.icloud.com/iclouddrive/010q2kpSROJdDZjeCquXDTTvQ#01-250903_1003 iCloud Drive - Apple iCloud icloud.com > On Sep 4, 2025, at 03:28, David McClain (as dbm at refined-audiometrics dot com) <[email protected]> wrote: > > Okay… > > Here is a link to an 80 MB file on my shared public cloud drive. It is a 48/24 stereo file. The glitch is in the left channel at 3:51.831. > > https://www.icloud.com/iclouddrive/010q2kpSROJdDZjeCquXDTTvQ#01-250903_1003 > > I have now decided that the glitches arise from the Icom IC-7700 Receiver. All the audio being recorded in the left channel comes from a SSB Demod of an RF signal centered at 15 MHz. That’s the only way to get an RF signal down to audio frequencies. > > The glitch follows the radio audio signal, whether fed to Analog 6 or Analog 7 in the MOTU ADC. There is never any glitch in the IRIG-B AM signal in the other Analog channel. And the glitch is always the same 6 ms and cycle-slip, no matter which RF Reference Generator (Agilent or Siglent) is in use. > > So my conclusion is that something slips inside the radio, causing its own SSB demod carrier to slip, which produces a slip in the resulting audio phase. > > And this follows your earlier notion of a 32-bit counter. I’m pretty sure the DDS inside the radio is using a 32-bit counter. > > Exactly why the RF Demod reference slips is a mystery to me, and may never be answered. > > - DM > > >> On Sep 4, 2025, at 00:23, Yuri Davidovsky (as work at disclosure dot ie) <[email protected]> wrote: >> >> >> >>> On 4 Sep 2025, at 02:45, David McClain (as dbm at refined-audiometrics dot com) <[email protected]> wrote: >>> >>> I looked carefully at the 48 kHz recordings. The glitch shows really prominently in the Left channel, and there is no corresponding glitch in the Right channel IRIG-B audio. >> >> Could you post a wav file snippet with the glitch in it including a bit of the clear signal? I will try to filter the burst out just to see what it looks like on its own by subtraction of the clean signal from the contaminated one. >> >> _______________________________________________ >> Lisp Hug - the mailing list for LispWorks users >> [email protected] >> http://www.lispworks.com/support/lisp-hug.html >