Cheap Chinese optical SPDIF switches

[rah]

a 12 khz square wave and a low level square wave at 250 hz

Thanks for the reply. Can I ask what you used as the source for these waves in your test?

 

[bennetng]

And here is the switcher I measured in Red, vs the Vlink device with a much lower jitter clock. In places the jitter raises the noise floor more than 30 db. You also see some spikes of periodic jitter. The highest of which are less than -70 db from the signal.

View attachment 40608

Oppo's explanation on HDMI jitter:
https://www.oppodigital.com/KnowledgeBase.aspx?KBID=129&ProdID=UDP-205

BTW, here are 24/48 and 24/96 J-Tests of my mainboard's ALC892 output.

 

[rah]

here are 24/48 and 24/96 J-Tests of my mainboard's ALC892 output.

Thanks. Seeing as you're doing J-Tests as well, can I ask what the source of the wave forms was for your test?

 

[Blumlein 88]

Thanks for the reply. Can I ask what you used as the source for these waves in your test?

I created the files myself. I used Audacity. I also have a copy of the files JA uses at Stereophile in 24 bit and 16 bit, but only for 44,100 sample rate.

What I normally use is a 11,025 hz sine wave. It effectively makes no difference which I can explain, but to keep it simple won't do here. I also put the level at -.1 db when I make one. For most purposes this is fine. I leave out the low level signal at the lower frequency.

 

[bennetng]

Thanks. Seeing as you're doing J-Tests as well, can I ask what the source of the wave forms was for your test?

https://hydrogenaud.io/index.php?topic=108927.msg895997#msg895997

 

[rah]

I created the files myself.

I see, thanks.

 

[rah]

https://hydrogenaud.io/index.php?topic=108927.msg895997#msg895997

Thanks.

 

[somebodyelse]

Thanks. Seeing as you're doing J-Tests as well, can I ask what the source of the wave forms was for your test?

@miero's sox thread has details on creating a number of test signals including J-Test at different sample rates and bit depths.

 

[rah]

@miero's sox thread has details on creating a number of test signals including J-Test at different sample rates and bit depths.

That's great, I was looking at sox just before you sent this, thanks