Search found 4 matches

by Wes Brenner
Fri Jun 28, 2019 3:19 am
Forum: Ultra Sound card for the Pi
Topic: Problem with digital noise entering analog output (addition)
Replies: 0
Views: 455

Problem with digital noise entering analog output (addition)

Further evidence of the noise source is that the noise at 192k in the left channel is 180 degrees out of phase with the noise in the right channel. This makes it likely that there is a bleed of the lrclk into the analogue signal. Since I only have the adc/dac board connected to the rpi it must be bl...
by Wes Brenner
Wed Jun 26, 2019 11:30 am
Forum: Ultra Sound card for the Pi
Topic: Pinout of ultra 2 soundcard
Replies: 2
Views: 756

Re: Pinout of ultra 2 soundcard

Its just an oversight but pin 17 seems to be assigned to both 3.3V and ground.
Wes
by Wes Brenner
Wed Jun 26, 2019 11:14 am
Forum: Ultra Sound card for the Pi
Topic: Setup instructions for the Ultra 2 ADC/DAC?
Replies: 2
Views: 594

Re: Setup instructions for the Ultra 2 ADC/DAC?

The instructions I used were: Manual Setup Make sure you have a recent enough firmware which includes the Ultra 2 machine driver + cs4265 codec driver updates : sudo rpi-update Edit your /boot/config.txt file to disable dtparam=audio (the # below comments it out): #dtparam=audio Edit your /boot/conf...
by Wes Brenner
Tue Jun 25, 2019 5:26 am
Forum: Ultra Sound card for the Pi
Topic: Problem with digital noise entering analog output
Replies: 0
Views: 459

Problem with digital noise entering analog output

I have tested the Ultra2 (from my kickstarter participation) with two files generated with Audacity. The first was generated with "silence" at 192k signed 32bit. The second was generated with 440hz max amplitude at 192k signed 32bit. I have narrowed the search for the noise to the output terminals f...