Pre/deemphasis in software?

[Ralph A. Schmid, dk5ras]

Hi,

I am looking for a pre/deemphasis in software, to run on a w2k machine
with Azalia / HD-Audio interface. A two-way radio with flat audio has
to be adapted to have a frequency response of +6dB/octave in one
direction, -6dB/octave in the other direction.

Is there some piece of software available that does the job? The
simpler the better :-)

Thank you in advance for any input!


-ras

--

Ralph A. Schmid

http://www.dk5ras.de/ http://www.db0fue.de/
http://www.bclog.de/

[bg]

Ralph A. Schmid, dk5ras wrote in message ...
>Hi,
>
>I am looking for a pre/deemphasis in software, to run on a w2k machine
>with Azalia / HD-Audio interface. A two-way radio with flat audio has
>to be adapted to have a frequency response of +6dB/octave in one
>direction, -6dB/octave in the other direction.
>
>Is there some piece of software available that does the job? The
>simpler the better :-)
>
>Thank you in advance for any input!
>
>
>-ras
>
>--
>
>Ralph A. Schmid
>
>http://www.dk5ras.de/ http://www.db0fue.de/
>http://www.bclog.de/


If you are using the audio inputs and outputs of a sound card to connect a
two way radio, there is nothing simpler than inserting an RC network into
the audio lines. The preemphasis and deemphasis is usually built into the
radio anyhow. Details?
bg

[Ralph A. Schmid, dk5ras]

"bg" > wrote:

>If you are using the audio inputs and outputs of a sound card to connect a
>two way radio, there is nothing simpler than inserting an RC network into
>the audio lines. The preemphasis and deemphasis is usually built into the
>radio anyhow. Details?

Hardware is not an option; in some cases the sites are not accessible
all the time, and fiddling with the hardware may be difficult. The
other problem are the levels and impedances - it would be a special
solution für every pair of soundcard and radio. And many radios have
no pre/deemphasis, others have...


-ras

--

Ralph A. Schmid

http://www.dk5ras.de/ http://www.db0fue.de/
http://www.bclog.de/

[bg]

Ralph A. Schmid, dk5ras wrote in message ...
>"bg" > wrote:
>
>>If you are using the audio inputs and outputs of a sound card to connect a
>>two way radio, there is nothing simpler than inserting an RC network into
>>the audio lines. The preemphasis and deemphasis is usually built into the
>>radio anyhow. Details?
>
>Hardware is not an option; in some cases the sites are not accessible
>all the time, and fiddling with the hardware may be difficult. The
>other problem are the levels and impedances - it would be a special
>solution für every pair of soundcard and radio. And many radios have
>no pre/deemphasis, others have...
>
>
>-ras
>
>--
>
>Ralph A. Schmid
>
>http://www.dk5ras.de/ http://www.db0fue.de/
>http://www.bclog.de/

Google comes up with over 300,000 hits for a realtime equalizer.

[Ralph A. Schmid, dk5ras]

"bg" > wrote:

>Google comes up with over 300,000 hits for a realtime equalizer.

Makes setting it up more difficult, and it has to be tested if the dB
values are correct, but this is my plan b... :-)


-ras

--

Ralph A. Schmid

http://www.dk5ras.de/ http://www.db0fue.de/
http://www.bclog.de/