Re: [amsat-bb] Strainge audio input problems on my laptop

["SV1BSX" <sv1bsx@xxxxxxxx>]

William,

have you any Software for MP3s?

I remember a similar problem a few years ago on my desktop P-II PC with
WinAmp Software.
If the WinAmp was aligned to play audio CDs & MP3, I had distorted sound.
With Win-player for CDs and WinAmp for MP3s, no problem (under Win98).


73, Mak SV1BSX


----- Original Message -----
From: "William Leijenaar" <pe1rah@yahoo.com>
To: <amsat-bb@amsat.org>
Sent: Sunday, May 21, 2006 2:02 AM
Subject: [amsat-bb] Strainge audio input problems on my laptop


> Dear AMSATs,
>
> Since a long time I have a strainge problem with my
> ASUS L8400 laptop computer. The problem is with the
> audio input signals (mic and line-in) that are
> distorted in software programs, but when I hear it
> directly at the speakers it is off excelent quality.
>
> The problem I noticed for a long time ago (~1 year)
> but it was no real problem then. Now I was doing some
> test with SSTV again and "bumped" again to this
> forgotten problem. I started a small investigation to
> find the problem so I can use my laptop for ham radio
> again.
>
> Unfortunatly even after many hours of testing I still
> have no clue where is the probem. The operating system
> I use is WIN98, and the audio chip set is said to be
> "ESS Allegro"
>
> When I put a mic on the mic-input and a speaker on the
> output I can hear my voice very well out of the
> speakers, mixed with CD music and all windows sounds.
> The problems apears when I want these sounds to be
> used in a software application, like in ham
> applications or the audio recorder of WIN98 etc...
>
> When I record the sounds in the windows audio recorder
> she signals from the mic are very distorted and only
> the peaks of a very loud sound get through.
> I have been testing with different mic levels (on the
> audio control panel) and I discovered that when I put
> the level of the mic at half to maximum level then
> other audio sources (like CD or windows sounds) get
> also distorted. These sounds seem to get the same
> problem.
>
> The problems I see only happen in the software
> aplications. E.g I can hear the CD-music excellent in
> real, but when I later listen back a record of the
> sound it is distorted when the mic level is maximum.
> When I put the mic level to about less than half the
> recorded CD music is normal again.
>
> I installed the audio drivers several times from the
> original CD, and also tried it with a download from
> internet, but the problem stays...
> It might be the hardware, but then I wonder why I can
> clearly hear my voice out of the speakers.
> For me this means the mic amp is okay...
>
> Maybe there is a problem with the ADC's what I hardly
> believe because there is still an amplifier in
> front of the ADC's...
>
> Unfortunatly I am not well known with those digital
> soundblaster electronics in computers...
> These days ham radio is full of sound-blaster
> modulations, and I hope some of you have any idea what
> is the problem and how to solve it... I also would
> like to know how these audio channels are switched and
> mixed in these ESS Allegro chips... Maybe it might
> give a clue where the problem is...
>
> 73 de PE1RAH
> William Leijenaar
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