Rear outputs problem with ADI Surround
Hello,
I'm working on a project with the AD194x. The goal is to use the ADI surround algorithm to upmix a stereo source. So far, my project looks like the exemple in the ADI Surround wiki page. Frequency sampling is 48KHz.
After multiple tests, I realize that the rear channels, LR and RS, sound unbalanced. To the ear, it sounds like there is more high frequency components in the RS channel. I tried the different modes, I swaped the outputs then the inputs, but the RS is always the louder channel.
Do you have any ideas what can cause this issue?
Jerome
Hello Jerome,
I will investigate but it would be good to also have your project.
Dave T
Hi Dave,
Thank you to take the time to consider my issue. As requested, please find attached my adi surround test project. As you will see, I kept the design as simple as possible. For my test I play music via a spdif source. I connected my headphone on the outputs 6 and 7.
The master clock is 12.288MHz.
The PLL is set as:
PLL_CTRL0 = 0
PLL_CTRL1 = 1
PLL_CTRL2 = 0
Regards,
Jerome
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