[hpsdr] R: PowerSDR/OpenHPSDR mRX PS v3.2.24 released

[Giovanni Santin]

Hi Doug,
forgive me but, could you please explain when you write at the end :

You WILL need to reset your database for this release.

Do I have to uninstall the previous version of the software and delete
manually the database.xml file ?

Many thanks,
Giovanni, IZ0SQZ

-----Messaggio originale-----
Da: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Per conto di Doug W5WC
Inviato: venerdì 20 febbraio 2015 04.03
A: hpsdr at openhpsdr.org; apache-labs at yahoogroups.com
Oggetto: [hpsdr] PowerSDR/OpenHPSDR mRX PS v3.2.24 released

***** High Performance Software Defined Radio Discussion List *****

All,

PowerSDR/OpenHPSDR mRX PS v3.2.24 has been released.

This release can be downloaded from the openhpsdr.org website.
http://openhpsdr.org/download.php

This release contains the following changes:


- A new algorithm for Noise Reduction has been added. This algorithm belongs
to a different class than the other NR algorithm and we encourage you to
give it a try.  In many situations, you may find it much more effective and
a more pleasant listening experience.  The "NR" 
buttons to enable the RX1 and RX2 Noise Reduction are of course on the main
console.  To save screen real estate, these buttons are now tri-state
buttons.  Click once to get the 'NR' algorithm, click again to get the new
'NR2' algorithm, and click again to turn NR2 OFF.

Tip on using Noise Reduction:  Always be sure to properly set the "AGC
Gain".  The simplest way to do so is to position the green "G" line just a
few dB above the noise floor on the panadapter.  If you do NOT do this, the
AGC will be working to counteract the Noise Reduction.  Note also a couple
facts about Noise Reduction algorithms:  (1) They cannot make something out
of nothing --- they have limitations.  (2) They all have some audio
"artifacts" of one kind or another.

As we continue moving toward implementation of a new software-hardware
communication protocol, we have now also made a change in the sample rates
at which the DSP internals operate.  In particular, the DSP internals now
always operate at the following rates:
* Receivers:  48K for all modes except FM, 192K for FM.
* Transmitter:  96K for all modes.

Do not confuse these "internal DSP rates" with the selectable sample rate on
the Setup/Audio/Primary tab.  You can still select 48K/96K/192K/384K as you
previously have on the Audio/Primary tab. That selection will determine the
sample rate at which the hardware returns data to the software and will
determine the panadapter width as it has in the past.  So, why do the
"internal DSP rates" matter to you?  They matter because the filters within
the DSP obviously operate at the internal DSP rates and their "sharpness" is
determined by the combination of sample rate and DSP Buffer Size (see
Setup/DSP/Options for buffer sizes).  Recommended buffer sizes are now:
* Receivers:  >= 1024 except for, FM >= 4096.
* Transmitter:  >= 2048.

Note that before this release, if you changed the sample rate on the
Setup/Audio/Primary tab, it was also advisable to change the DSP buffer size
to compensate to provide the same filter "sharpness". That is no longer
necessary.

For the NR and ANF functions, default values of "Taps" and "Delay" have also
been changed per the new DSP internal sample rates.

Note that when using PureSignal, on the Setup/Audio/Primary tab, you must
select 192K as your sample rate, just as before.

- A "NR2" control for the DJ Console was added for the new noise reduction
feature.

You WILL need to reset your database for this release.

Thanks & 73,

Doug, W5WC
Warren, NR0V

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