PSN-L Email List Message

Subject: Re: Stability of sound cards
From: "James L. Gundersen" jgundie@.......
Date: Tue, 11 Jul 2006 12:27:59 -0700


> Jim Hannon,

Isn't +/-100ppm +/-0.01Hz at 1000Hz?

Jim Gundersen

----- Original Message ----- 
From: "James Hannon" 
To: 
Sent: Tuesday, July 11, 2006 9:05 AM
Subject: Stability of sound cards


> Sound cards use a small surface mount crystal oscillator for their 
> reference frequency. These oscillators typically have a stability of +/- 
> 100 ppm over a temperature range of -10C to +70C. This is +/- 0.1 Hz at 
> 1000Hz. Which is in the same ballpark as the 0.061 Hz per step at 12 bits. 
> However the sound card is not very likely to see such temperature 
> variations and there are ways of digitally removing offsets and slowly 
> varying drift from the data.
>
>
> Jim Hannon
>
> --
> Jim Hannon
> http://www.fmtcs.com/web/jmhannon/
> 42,11.90N,91,39.26W
> WB0TXL
> --
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