Re: [LAD] A little quiz about audio measurements...

From: Ralf Mardorf <ralf.mardorf@email-addr-hidden-dsl.net>
Date: Fri May 28 2010 - 21:22:07 EEST

Veronica Merryfield wrote:
>> The 100 Hz (being 2x 50Hz, the power freq. in Italy)
>> suggests that it is probably related to some manner of
>> power supply. However, I have no theory why we're
>> getting 2x 50Hz (and I think I need one :-)).
>>
>
> The implication has been that the USB audio device is a cheaper device. It is therefore more likely that the device runs from the USB 5 volt line than have a separate power supply, and that 5v line is regulated and therefore less likely to have a power line ripple on it.
>

USB power source very often breaks down and regulation isn't filtering.
_______________________________________________
Linux-audio-dev mailing list
Linux-audio-dev@email-addr-hidden
http://lists.linuxaudio.org/listinfo/linux-audio-dev
Received on Sat May 29 00:15:06 2010

This archive was generated by hypermail 2.1.8 : Sat May 29 2010 - 00:15:06 EEST