Whistle When Using Sound Card as Pass-Through

"Randy Howard" <FOOrandyhoward RemoveThis @verizon.netBAR> wrote in message
news:MPG.23177e28d7949417989680@news.verizon.net...
> In article <DtOdnZKzQIxoXTDVnZ2dnUVZ_tjinZ2d RemoveThis @giganews.com>,
> nowhere RemoveThis @nowhere.com says...
>>
>> "Jolly Roger" <jollyroger RemoveThis @pobox.com> wrote in message
>> news:jollyroger-807CCE.09163821082008@news.individual.net...
>> [snip][
>> >
>> > One has to wonder if "Sylvan Morein, OD, Ll.b" and "Robert Morein"
>> > aren't, in fact, the same individual. ; ) Certainly both are
>> > potentially equally "tragically sick".
>> >
>> JR,
>> They are both the forgeries of one Brian L. McCarty, a U.S.
>> expatriate
>> currently resident in Cairns, Australia. Mr. McCarty is a persistent
>> spammer and forger, whose specialty seems to be character assassination.
>> His
>> motive is revenge for the exposure of investment scams formerly active at
>> http://www.coraseastudios.com and http://www.worldjazz.com.
>
> Wow, I had almost forgotten about this cretin. He was a nightmare in
> some home-theater based newsgroups way back when DVDs were first
> coming out. I would have thought karma would have caught up with him
> by now.
>
It turns out his usenet activities were the tip of the iceberg. I think he
is under house arrest in Cairns, but for some reason, they haven't pulled
his Internet connection. Perhaps he conned them into thinking he needs it to
"make a living." But being penned in his apartment makes him even more vile
on the web.

I'm sorry you guys have to be victims as well.

Regards to all,
Bob Morein
(310) 237-6511

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Richard Crowley <rcrowley.RemoveThis@xp7rt.net> wrote:
>OK. Cite an example of a good-quality built-in sound interface
>in a production computer. Just one. And I will eat the hat of
>my choice. Good luck.

The Otari RADAR!
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

> I've owned laptops that managed remarkably good recordings through
> their Line In.  But I've learned not to be surprised when a laptop is
> incapable of a clean recording, particularly when running on mains
> power.

Interesting, I had assumed that the mains in just kept topping up the
built-in battery on my laptop and the battery was the power source and
thus giving a 'clean' DC source.If I unplug the mains(just did that
now),all that happens is the screen dims as it should under battery
power.

Keith

"Michelle Steiner" wrote ...
> If his problem exists without the turntable being connected,
> how can RIAA equalization have anything to do with it?

The whistle "problem" will happen with essentially ANY built-
in computer sound interface. That is why I called them all
"cheap". Are you saying now that you agree it is a fundamental
problem with all built-in interfaces?

Even if the OP could get a reasonable SNR from his turntable
through the built-in interface, the RIAA equalization would be
a deal-breaker.

Of course one can easily get a USB interface, or even an
RIAA phono preamp with a USB interface, and the whole
issue would disappear.

<20to20.keith.RemoveThis@gmail.com> wrote ...
> > I've owned laptops that managed remarkably good recordings through
> > their Line In. But I've learned not to be surprised when a laptop is
> > incapable of a clean recording, particularly when running on mains
> > power.
>
> Interesting, I had assumed that the mains in just kept topping up the
> built-in battery on my laptop and the battery was the power source and
> thus giving a 'clean' DC source.If I unplug the mains(just did that
> now),all that happens is the screen dims as it should under battery
> power.

Have you actually tried recording with your laptop? (Or even playing
back to an external mains-powered amplifier, etc.)? Anytime you
connect to an external system, you run into pretty severe interference,
mostly hash from the "power brick" switchmode power supply.
That has been a pretty universal problem with every laptop system
I've ever used.

You can get around the problem by:
1) lifting the power supply ground,
2) running the laptop on batteries,
3) using audio isolation transformer(s)

On Aug 22, 1:20 pm, "Richard Crowley" <rcrow... DeleteThis @xp7rt.net> wrote:
> <20to20.ke... DeleteThis @gmail.com> wrote ...
>
> > > I've owned laptops that managed remarkably good recordings through
> > > their Line In. But I've learned not to be surprised when a laptop is
> > > incapable of a clean recording, particularly when running on mains
> > > power.
>
> > Interesting, I had assumed that the mains in just kept topping up the
> > built-in battery on my laptop and the battery was the power source and
> > thus giving a 'clean' DC source.If I unplug the mains(just did that
> > now),all that happens is the screen dims as it should under battery
> > power.
>
> Have you actually tried recording with your laptop? (Or even playing
> back to an external mains-powered amplifier, etc.)?
>

H4 into USB seems OK,allowing for the well known self-created H4
artifacts.
Play back through Event ALP 5's can produce some noise but I am sure
it is due to mains related office equipment as I can reduce it through
cable relocation.Power in is DC 19v 3.42A.

I will try your hints and see if it helps,

Thanks,Keith.

<20to20.keith RemoveThis @gmail.com> wrote ...
> H4 into USB seems OK,allowing for the well known self-created H4
> artifacts.

Yes, of course a digital connection like USB is an ideal solution.
But analog audio interfaces with laptop computers are inherently
problematic, IME.

In article <6h63ffFjblfvU1.TakeThisOut@mid.individual.net>,
"Richard Crowley" <rcrowley.TakeThisOut@xp7rt.net> wrote:

> And I will eat the hat of
> my choice. Good luck.

I suggest nacho (should one be found, of course).

This message is not archived

This message is not archived

On Aug 21, 3:57 am, bodhiSoma <bodhis... RemoveThis @gmail.com> wrote:
> Greetings,
>
> My system is a MacBook running OS X 10.4.10 (Tiger).
>
> I'm running the output of a Technics SL-B200 turntable into the line
> input of my Mac.  I have a set of computer speakers attached to the
> headphone output.
>
> I then open Sound Studio, go into preferences, set the input to "line-
> in input," set the output to "built-in output" and check off "play-
> through in to out."
>
> Everything works correctly but I'm getting this horrible squealing/
> whistle through my speakers even when the needle isn't contacting the
> record.  It's not terribly loud but it's certainly loud enough to make
> the music unlistenable.
>
> Here's a quick recording of the sound (first with the needle to the
> record and then without):
>
> http://www.pho7o.com/music/whistle.mp3
>
> I figure that since my input is "line-in" and not "built in mic," the
> speakers shouldn't be causing any feedback since the line-in can't
> pick up anything other than a line connection.  Perhaps this is an
> incorrect assumption.
>
> Then I disconnected both the external speakers AND the line-input
> (turntable) and the squealing persists!
>
> I've also tried doing this with Audio Hijack Pro with the same results
> so I assume it's not an application bug.
>
> What the heck am I doing wrong?
>
> Thanks much in advance,
> Jason

It's funny,listening to the link, it sounds like RIAA has been
applied. The 'whistle' sounds like 1kHz sine superimposed over fairly
normal sounding MP3 music.To me the music is separate from the
'whistle'.
Any opinions ?,or do I have Tinnitus ?

Keith

On Thu, 21 Aug 2008 14:12:44 -0700, "Richard Crowley"
<rcrowley.DeleteThis@xp7rt.net> wrote:

>> False distinction - it is not possible to separate these signals any
>> further in a high end stand-alone DAC or ADC. I daresay that there are
>> products out there with the latest-greatest high end audio chips in them
>> that are as cramped as a laptop.
>
>We aren't saying that is isn't technically possible in a laptop.
>It appears that it is economically impossible in a laptop because
>of the miniscule market and the extra cost of R&D, etc.

I've owned laptops that managed remarkably good recordings through
their Line In. But I've learned not to be surprised when a laptop is
incapable of a clean recording, particularly when running on mains
power.