Search found 28 matches

by fwachsmuth
Thu 2019-02-07 13:50
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 42
Views: 5631

Re: Can I change 1053 playback speed with a DDS as XTAL?

Sorry for being so persistent, but I have one more question. To allow a "sync start" with my film projector, I load the audio file and pause it right away, so that I can start it without any further delay once the film starts. However, when the audio doesn't start with silence, one can hear a brief ...
by fwachsmuth
Tue 2019-02-05 16:19
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 42
Views: 5631

Re: Can I change 1053 playback speed with a DDS as XTAL?

You are right.
It was my code being bad, now it works. Feels good to not have to peek for Byte 40 and 41 in the file header :)
by fwachsmuth
Mon 2019-02-04 21:19
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 42
Views: 5631

Re: Can I change 1053 playback speed with a DDS as XTAL?

Well, on page 44 of the data sheet says "Bits 15:1 contain the samplerate divided by two , and bit 0 is 0 for mono data and 1 for stereo". But yes, I should have shifted to the left then :) Nevertheless, my file has 44.1 kHz and SCI_AUDATA tells me it is 46.7kHz. Also, when reading from there during...
by fwachsmuth
Sun 2019-02-03 0:28
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 42
Views: 5631

Re: Can I change 1053 playback speed with a DDS as XTAL?

Hey guys, I do have one more question: How can I determine the original Sampling Rate of a loaded ogg file? Chapter 9.9.6 of the data sheet suggests to read Bit 15:1 from SCI_AUDATA, but when I do that and shift 1 to the right, I actually get 23350 instead of 22050. The file is definitely a 44.1kHz ...
by fwachsmuth
Sun 2019-01-13 19:20
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 42
Views: 5631

Re: Can I change 1053 playback speed with a DDS as XTAL?

I found it! It was too high load on GBUF. I use the MAX4741 switch and apparently some of the boards had a teeny tiny short between two pins because of a dent in my stencil! And since the MAX4741 is buried under a display, I missed that during visual inspection. Interestingly, some 1053 caused the h...
by fwachsmuth
Sun 2019-01-13 4:07
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 42
Views: 5631

Re: Can I change 1053 playback speed with a DDS as XTAL?

Hey guys, I have soldered ~30 boards so far (quite some work!) and about 15% don't work. The symptom is always the same: Right after powering on, the load on the 1.8V CVDD line is so high that my power controller shuts down after a second or two (it's peak current is 250 mA). I have failed so far to...
by fwachsmuth
Fri 2019-01-04 16:10
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 42
Views: 5631

Re: Can I change 1053 playback speed with a DDS as XTAL?

I did! The biggest challenge was fine tuning the PID controller in the end... to catch up timely, oscillate as little as possible and don't make changes which are too audible. BTW: Your Audio/Ground Considerations where gold. The thing sounds amazing. The MAX4741 is a bit pricey, but it was worth to...
by fwachsmuth
Fri 2019-01-04 10:17
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 42
Views: 5631

Re: Can I change 1053 playback speed with a DDS as XTAL?

Just so you know, I was finally able to finish this super niche project and soldered the first small batch of 10 boards. They sold within 3 hours! Not bad for a hobby project. :) The final result is here: https://www.filmkorn.org/synkino/?lang=en Thanks to all the great VLSI peeps for the thorough h...
by fwachsmuth
Mon 2018-04-09 10:23
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 42
Views: 5631

Re: Can I change 1053 playback speed with a DDS as XTAL?

That sounds promising. I guess tweaking a SCI_WRAM register should do the trick, similar as with 1053 playback?
I'll get my hands on a 1063 BoB soon to play with this. :)
by fwachsmuth
Fri 2018-04-06 8:29
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 42
Views: 5631

Re: Can I change 1053 playback speed with a DDS as XTAL?

I want to record Audio in sync to old film cameras — such as Super 8 or even using a (wind-up) spring motor. These cameras don’t run perfectly stable, often +/- 10% off the desired frame rate, and then not even steady due to mechanical challenges. My idea is to take the actual camera Speed (measured...