Re: Comparison of laptop audio output and function generator
- From: Jamie <jamie_ka1lpa_not_valid_after_ka1lpa_@xxxxxxxxxxx>
- Date: Wed, 26 Sep 2007 20:34:19 -0400
Charles wrote:
"MRW" <mr.whatever@xxxxxxxxx> wrote in message news:1190831539.138843.94910@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxI find that in many PC's and Laptops, the sound systems DAC/ADC is very poor
I am experimenting with an Instek oscilloscope. I have two sources.
One is an audio output from the laptop, and another one is a tone
output from a function generator.
This is a video of the laptop output:
http://video.google.com/videoplay?docid=-8413182111152350269&hl=en
This is video of the function generator output:
http://video.google.com/videoplay?docid=-3995690077431458348&hl=en
I just terminate the sources to a 1k-ohm resistor and put the
oscilloscope probes across the resistor.
Are laptop audio outputs really that "poppy" (intermittent signal
spikes)?
When I plug in a headphone to the output jack of the laptop, the tone
sounds clean. I was expecting to hear tiny pops.
If I were to take the laptop audio signal and re-route it to a
different circuit, how would I make the waveform "cleaner" like the
one from the function generator output?
I'm afraid that if I take the audio output of the laptop and connect
it to an amplifier, then the spikes will also get amplified and become
noticeable.
The first link is not working for me. Sorry.
Laptop audio outputs are all over the place ... in my experience ... some OK, some very marginal. Your ear will miss some things that a scope will see. You could use a filter with the laptop to clean up the waveform.
for precise work. The different venders for sound systems vary in what
they use (approximation or absolute) encoders/decoders.
Using FFT's (DFT's) works well in removing many of the artifacts from
poorly design discrete components, but not all of it.
The last professional sounds system I saw via a PC, didn't even use a
well known high end sound card that one would expect. They were using stand alone ADC's and DAC's with additional digital audio interfaces.
--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
.
- References:
- Prev by Date: Re: audio amplifiers: +/- X VDC vs 0-X VDC
- Next by Date: Re: audio amplifiers: +/- X VDC vs 0-X VDC
- Previous by thread: Re: Comparison of laptop audio output and function generator
- Next by thread: Re: Comparison of laptop audio output and function generator
- Index(es):
Relevant Pages
|
|
