linuxaudio.org

> Hello Fons. Almost all consumer portable devices seem to distort signals

quoted text
> above 16Khz in uncompressed 44100Hz audio. I always wondered about this,

> maybe they all have very crappy DA converters, or maybe it is because

> the reasons explained by Niels and Arnold in their emails...

It is not the DACs, it is almost always the analog amplifiers.  Have a

look at the various noise and distortion measures of audio opamps, the

figures tend to dogleg upward between 10 and 20kHz.  It's a

consequence of optimizing for very very deep signal depth below those

frequencies (and to a lesser extent, cost).  Even the most expensive

boutique audio opamps show this dogleg, and very few manage to push it

higher than 20-25kHz or so.  To do so, you have to sacrifice noise

performance.
You can get opamps that are dead flat with unmeasurable distortion to

100kHz or 1MHz... but you're only going to have 8 bits or less of

signal depth due to voltage and current noise.
Monty

_______________________________________________

Linux-audio-user mailing list

Linux-audio-user@lists.linuxaudio.org

http://lists.linuxaudio.org/listinfo/linux-audio-user