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K4 -- Spectral subtraction noise reduction

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Grant Youngman-2

K4 -- Spectral subtraction noise reduction

I’ve recently been exploring quite a few of the many SDR receivers on KiwiSDR. One of the (many) features of this system is an option to select spectral subtraction NR.

I’m now really hyped about the fact that this will be available at some point on the K4. It works exceptionally well. So well, that I leave it turned on most of the time. Often, stations you can barely copy down in the junk literally pop up out of the noise. Don’t know if this will be available at initial shipment, but it’s certainly something to look forward to if not. I’ve only tried it on AM and SSB at this point, so not sure about CW.

Just something else to whet the appetite for that eventual “you’re up” email from Elecraft sales … :)

Grant NQ5T
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Kurt Pawlikowski

Re: K4 -- Spectral subtraction noise reduction

Grant,

     You peaked my interest. I attempted to find examples of spectral
subtraction and only found talks about it (no audio examples). Would you
happen to know where I might find some examples? Maybe comparing results
between several noise reduction methods?

     Thanks!

     kurtt WB9FMC

On 9/10/2020 11:19 PM, Grant Youngman wrote:

> I’ve recently been exploring quite a few of the many SDR receivers on KiwiSDR. One of the (many) features of this system is an option to select spectral subtraction NR.
>
> I’m now really hyped about the fact that this will be available at some point on the K4. It works exceptionally well. So well, that I leave it turned on most of the time. Often, stations you can barely copy down in the junk literally pop up out of the noise. Don’t know if this will be available at initial shipment, but it’s certainly something to look forward to if not. I’ve only tried it on AM and SSB at this point, so not sure about CW.
>
> Just something else to whet the appetite for that eventual “you’re up” email from Elecraft sales … :)
>
> Grant NQ5T
> ______________________________________________________________
> Elecraft mailing list
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Wes Stewart-2

Re: K4 -- Spectral subtraction noise reduction

https://www.rtl-sdr.com/forum-talk-videos-from-hamvention-2017/ 51 minutes in.

Wes N7WS

On 9/11/2020 6:32 AM, Kurt Pawlikowski wrote:

> Grant,
>
>     You peaked my interest. I attempted to find examples of spectral
> subtraction and only found talks about it (no audio examples). Would you
> happen to know where I might find some examples? Maybe comparing results
> between several noise reduction methods?
>
>     Thanks!
>
>     kurtt WB9FMC
>
> On 9/10/2020 11:19 PM, Grant Youngman wrote:
>> I’ve recently been exploring quite a few of the many SDR receivers on
>> KiwiSDR. One of the (many) features of this system is an option to select
>> spectral subtraction NR.
>>
>> I’m now really hyped about the fact that this will be available at some point
>> on the K4. It works exceptionally well. So well, that I leave it turned on
>> most of the time. Often, stations you can barely copy down in the junk
>> literally pop up out of the noise. Don’t know if this will be available at
>> initial shipment, but it’s certainly something to look forward to if not.
>> I’ve only tried it on AM and SSB at this point, so not sure about CW.
>>
>> Just something else to whet the appetite for that eventual “you’re up” email
>> from Elecraft sales … :)
>>
>> Grant NQ5T
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
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>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
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Elecraft mailing list

Re: K4 -- Spectral subtraction noise reduction

Spectral subtraction was used in the JPS noise reduction units long ago. I still have my NIR-12.

Tom W4KX

Sent from my iPad

> On Sep 11, 2020, at 12:21 PM, Wes <[hidden email]> wrote:
>
> https://www.rtl-sdr.com/forum-talk-videos-from-hamvention-2017/ 51 minutes in.
>
> Wes N7WS
>
>
>
>> On 9/11/2020 6:32 AM, Kurt Pawlikowski wrote:
>> Grant,
>>
>> You peaked my interest. I attempted to find examples of spectral subtraction and only found talks about it (no audio examples). Would you happen to know where I might find some examples? Maybe comparing results between several noise reduction methods?
>>
>> Thanks!
>>
>> kurtt WB9FMC
>>
>>> On 9/10/2020 11:19 PM, Grant Youngman wrote:
>>> I’ve recently been exploring quite a few of the many SDR receivers on KiwiSDR. One of the (many) features of this system is an option to select spectral subtraction NR.
>>>
>>> I’m now really hyped about the fact that this will be available at some point on the K4. It works exceptionally well. So well, that I leave it turned on most of the time. Often, stations you can barely copy down in the junk literally pop up out of the noise. Don’t know if this will be available at initial shipment, but it’s certainly something to look forward to if not. I’ve only tried it on AM and SSB at this point, so not sure about CW.
>>>
>>> Just something else to whet the appetite for that eventual “you’re up” email from Elecraft sales … :)
>>>
>>> Grant NQ5T
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to [hidden email]
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Grant Youngman-2

Re: K4 -- Spectral subtraction noise reduction

You can’t really compare an NIR-12 to a more current implementation. The KiwiSDR algorithm runs on a BeagleBone processor with virtually no discernible artifacts. The artifacts were the achilles heel of the NIR-12. I had one for a while. Never liked it.

Presuming Elecraft delivers what they have said they’re working on, it will be a great addition to the radio.

Grant NQ5T

> On Sep 11, 2020, at 3:23 PM, Tom Doligalski via Elecraft <[hidden email]> wrote:
>
> Spectral subtraction was used in the JPS noise reduction units long ago. I still have my NIR-12.
>
> Tom W4KX
>
> Sent from my iPad
>
>> On Sep 11, 2020, at 12:21 PM, Wes <[hidden email]> wrote:
>>
>> https://www.rtl-sdr.com/forum-talk-videos-from-hamvention-2017/ 51 minutes in.
>>

stengrevics

Re: K4 -- Spectral subtraction noise reduction

And, it will work on digital modes.

John
WA1EAZ

> On Sep 11, 2020, at 6:30 PM, Grant Youngman <[hidden email]> wrote:
>
> You can’t really compare an NIR-12 to a more current implementation. The KiwiSDR algorithm runs on a BeagleBone processor with virtually no discernible artifacts. The artifacts were the achilles heel of the NIR-12. I had one for a while. Never liked it.
>
> Presuming Elecraft delivers what they have said they’re working on, it will be a great addition to the radio.
>
> Grant NQ5T
>
>> On Sep 11, 2020, at 3:23 PM, Tom Doligalski via Elecraft <[hidden email]> wrote:
>>
>> Spectral subtraction was used in the JPS noise reduction units long ago. I still have my NIR-12.
>>
>> Tom W4KX
>>
>> Sent from my iPad
>>
>>> On Sep 11, 2020, at 12:21 PM, Wes <[hidden email]> wrote:
>>>
>>> https://www.rtl-sdr.com/forum-talk-videos-from-hamvention-2017/ 51 minutes in.
>>>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]