Problem playing back recorded sounds

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=SERGE=

Hello

I'm using a midi keyboard to record sounds on a notebook ibm x60
with inbuilt sound card sth Sound mAX High Definition ..

The problem is that when I play sound with my keyboard the sound quality is
good close to that of the paino (within reasonable limits) whereas when I
play the recorded sounds back it's no more the same quality , the sounds
are altered, nasal ....

That's important for I bought the keyboard to be able to record what is
being played and to listen to it afterwards.


What can be the matter?

Thank you
 
=SERGE= said:
Hello

I'm using a midi keyboard to record sounds on a notebook ibm x60
with inbuilt sound card sth Sound mAX High Definition ..

The problem is that when I play sound with my keyboard the sound quality is
good close to that of the paino (within reasonable limits) whereas when I
play the recorded sounds back it's no more the same quality , the sounds
are altered, nasal ....

That's important for I bought the keyboard to be able to record what is
being played and to listen to it afterwards.


What can be the matter?

Thank you
Click to expand...

I can only make a suggestion based on past experience.
I had a motherboard with an Analog Devices AC'97 CODEC on it,
and that uses the SoundMax driver. The control panel notes
that "special effects" can be applied to played back content.
When the effects are set to "None", there are still actually
DSP effects being applied to the content. In my case, I detected
echo (used for reverb), which causes the content I was listening
to, to sound muddy. It was an attempt to provide ambience on their
part, which I did not appreciate. I had to get a separate sound
card, to get rid of it.

A second way to snip off the high frequency content on a signal,
is to reduce the sampling rate. Nyquist's theorem sets the
upper limit on frequency response. As an example, 8KHz is used
in telephony, to implement a 4KHz voice bandwidth. (The voice
band is actually lower than that, and the requirement is for
the signal to be severely attenuated at 4KHz.) The reason for
the limit, is to prevent aliasing.

So check the sample rate of the recording method.

On a laptop, one way to bypass the onboard sound, would be to
use a USB sound solution. I don't know if they make PCCard or
Expresscard sound cards or not.

On the high end, you could look at some of the products here.

http://www.m-audio.com/index.php?do=products.family&ID=FWinterfaces

http://www.m-audio.com/index.php?do=products.family&ID=USBinterfaces

Paul
 
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