Noise Reduction Speakers (
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- čas přidán 31. 07. 2024
- Oggie John Reardon, KD0RON, asks about noise reduction speakers.
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I was surprised at how clean my setup is just with Audacity. When hooking up my various rigs to do tests and audio gates, I was surprised at just how much weak signal I could get, how much skip there was even on 10/11 meter that you can't even hear on the speakers from time to time that periodically comes through. You might be getting bombarded by more weak skip signals than you realize....
Otherwise, this reminded me of one of the CB stations I listened to when conditions on 11/10 meter got really hot last Monday night. The guy was talking about all the AM high fidelity he was working on and how good his setup was, and I could believe it. When his signal was at its strongest, it sounded better than AM broadcast radio. He had a full high end microphone setup, mixer, the whole nine yards. Beautiful.
Goes to show that with a good receiving rig and a good transmitting setup with good audio out, you can get incredible results. With all this modern advancement in audio technology, sound quality on even amateur radio can be surprisingly great. Small improvements are still being made, and it was fun to hear serious radio/audio experimenters on 11 meter "Chicken Band".
Dave, thanks for helping me identify my problem. I now know that the hiss heard in my ears 24/7 is HF hiss. My ears must be HF. My doctor calls it tinnitus, but I like HF better.
Thanks Dave! I have a Yeasu 747 that I plan on using for camping and such, and have been looking hard at trying a CLR Speaker with it. I'm definitely going to give it a shot now!
My Yasue has a great DSP/NR system - but the old Shack Warmer HW101 could use some of that - so I got the West Mountain CLRdsp unit to pug in between the radio and the HeathKit speaker ( a very nice speaker on its own). That setup works great, and I can plug the headset into the CLRdsp so I have cleaner audio with those too. That unit works very well at reducing or eliminating the background noise .
I have a BHI NES10-2 MK4 DSP speaker that I use with my Icom IC-7300 and I can tell you it's outstanding. It's available from DX Eng for about $170.00. It's remarkable all the hiss and static it removes. It allows me to hear signals I otherwise wouldn't that are down in the noise floor. It also has a headphone jack on the side that allows you to feed the DSP processed audio to a set of headphones.
Running tests on the FreeDV digital HF voice software, I found it does seem to have some DSP filtering even when not decoding and sounded much better. Free download and worth a try.
this is what i was looking for as i have an USB audio interface already , i'm assuming we are referring to reducing noise on the incoming audio (RX) ?
Dave here is a nice trick. Put a low pass filter on the left channel and a high pass filter on the right channel. This allows your brain to 'see' the signal in a spatial way. You can separate signals (especially effect with CW) in your head. JS6TRQ / WC8J
M0OLT. I use an economical unit , the BHI -SES10. One rotary filter control but does have headphone socket. Not as clever as the filters in my newer FT991a but got rid of that top noise on older sets and I still prefer it to Internal DSP.
I am a Computer Science student and have basic SystemVerilog Skills. Would you give me some suggestions to build white noise machine by myself? I already have speakers. How should I identify the sound to play?
I've got an option to run received audio through a decent quality studio type graphic EQ, although I also have DSP in my main receiver. That's a good option and it's cheap too - if you buy the EQ secondhand. It can clean up some nuisances that the DSP can't, but it doesn't replace it, it's just another tool in the box.
Sometime you can run the audio through a cassette recorder. They don't handle high frequency well and I have used it to cut out the sounds from recording from old records. If you have a cassette recorder give it a try and see if it helps.
Before my 7300 i used to use an idiom press switched cap filter. It helped a lot on cw.
SDRPlay as a second RX would give decent results
The SDRuno actually does not do anything over regular hardware radio. The authors of the software put a lot of afford into creating already obsolete hardware filters like NB and NR. I recommend that you use denoising software like krisp. The filters supplied with the SDRuno software are in the 20th century and do not play in the same league as modern AI voice processors. You can get decent results using moderate antennas with diversity and AI.
I have a West Mountain CLRdsp noise reduction processor inline between my TS-440 and my external Yaesu speaker. The CLRdsp does work, but I’ve found that just having an external speaker makes a difference. I have never liked the sound from an internal speaker. If you want to keep running the older stuff, then one of these DSP filters might work for you. If you might upgrade, then I would put the money you would spend for one of these towards a radio with the DSP already built in.
I have a BHI I absolutely love it
Same here, i have the DSPKR
Same here. I just bought my 3rd one! One for each car and one for the shack.
If you are merely trying to get rid of some low end hum or irritating frequencies, (as HF is always noisy) using an outboard audio EQ should allow you to lower 'offending' frequencies while retaining the crisp upper end higher frequencies. NR will not get rid of a low hum. - You can find a 31-band rack mount EQ audio unit for $50 used on eBay.
Or you can also opt for a small audio mixer with Low/Mid/High tone control for around $45
You could also run it through a quality stereo system and use its tone controls.
- YES - there are some audio applications that will allow you tone control in 'real time' but much easier to use outboard gear.
I also use a powered 200 Watt 15"+2" horn loudspeaker (think Karaoke) to crank up weak signals. ($100) or monitoring while house cleaning. ;-) It also has Low/High tone adjustment.
If you have a strong signal with lots of noise, use your Squelch. (RF Attenuation) Using the NR does tend to make it muddy (less highs) the greater you adjust it.
So, for $45-$150 you can tailor your incoming audio...to the best of your ability. (expectations adjusted, too!)
As far as headphones, -being a professional musician for over 33 years, I don't recommend using them except sparingly at very low volumes or mission critical applications. The bandwidth of the inherent noise will cause auditory damage if used extensively.
Even putting the radio output through a 1980's parametric equalizer can clean up a signal. And that's also implemented in plenty of music apps. SDRs should have no problem offering the same abilities.
I sometimes put a capacitor across the speaker leads to cut the high audio frequencies. Makes the audio a lot smoother on the ears.
Radio shack dsp-40 is cheap and extremely effective. Filters for noise reduction, ssb, and cw 3 settings for each. It's a very nice piece of equipment for my use.
Thank you! I see companies pushing all these DSP speakers and no one (until now) being clear that with a modern radio it's all built in and you don't need them. A certain well know ham audio guy has a basic one channel EQ with some DSP and a speaker for almost $600! Talk about a justification for a 7300 or an FTDX 10! And, sadly, I have one friend that added that setup to his 7300 because he didn't understand how to use the built-in capabilities of the radio. Very sad. Thank you again!
Bear dynamic bt770 are great low cost head phones that work like studio phones 😉😉
Steer clear of the wm clear. If you want to try speaker look for one of the older amcol clear speech speaker. Imho your better off with a new aYaesu ftdx10 the Digital Noise reduction work amazingly totally kills 90% of band noise on level 5 of 15. Simply amazing receiver imho
I wonder about putting the audio through SDRSharp? I might have to try that. The noise reduction is pretty good, although best on the IF for AM based modes.
GNU Radio probably has modules for this too, or if so inclined you could try writing some yourself. Pretty advanced stuff though.
yeah, SDR# is an option, also HDSDR.
I have an old Atlas 210x, and it have no filters. I plug it to my computer and use HDSDR and use the software filters. I think its better than my FT 857 dsp filters. Sounds really good. I tried SDR# but it was not so easy to get a good quality sound and HDSDR was a better choice. Sometimes I use it on my FT 857 too :P
In all honesty, use the "older radio" as is ... maybe as a backup rig or if you are like me, put it in a hunting cabin or vacation home, etc. and then buy a modern rig with DSP. Not only will it cost not a lot more than trying to make an old radio sound slightly better, you will get more features and the more you use your "older radio", the more you will appreciate your new rig.
I highly recommend the Heil PRAS and powered speaker. It really cleans up the audio.
I use the Heil PRASQ speaker system... I have had it almost 2 years, would not want to be without it. Instead of eliminating, it allows me to adjust the output to fit my hearing range. EQ to my ears. Just the thing for aging hearing for us older Hams...
I never realized how much hearing trouble I had until I started to talk on hf. After 25 years talking on vhf with fire and police never dreamed it would be a problem. WRONG!
Talking with unfamiliar voices with a 4K hum is darn near impossible.
Only could hear with headphones and was constantly fooling with adjustments. Totally took the fun out of it. One day I was digging around in my old analog sound processing equipment. Haven’t used in it n years but never wanted to sell it. Might need it one day you know.
After messing around with signals for a few nights came up with a solution. Looks like the biggest pile of overkill in the world. The RX comes through several pieces of equipment like equalizer, gate, amp, BBE, and a couple of filters I can make out voices plainly. And with limited adjustments I can hear very well.
But then I had to drag out the old RE27 and some more items to input the mic so now it’s completely overkill, but hey, it’s fun and looks manly! Lol
I encountered a lot of noise on my rig. The NR filter does help on the IC-7300. The 80/10 end fed antenna doesn't. Fe rite filters work wonders. I replaced the terminals on the wires from my power supply to my transceiver with something decent. Now I'm only fighting mother nature, and household members who buy electronics - I still can't win.
Great timing! I was just wondering if I could pipe my ts-450 audio through my laptop to clean it up!
HDSDR is a free software to do it. There is other options but in my tests it was the best one.
I've repeatedly had the ear cushions on Sony headsets fall apart. Black flakes all over. They sell replacements, but Beyerdynamics also makes replacements. Same price, but they don't rot apart like the Sony's do. (Amazon, etc.)
A NOTHER GOOD ONE DAVE
Would a DSP speaker help with reducing local interference from my neighbours?
Maybe. But if you have a modern radio, it probably has DSP noise reduction already built in.
Ok Dave... You can't throw out a huge flex like that (2:55) and not tell us more!! It sounds like you got some unexpected ROI on it too! hi hi. Great video as always.
Yes, my name is on two patents. I did the bulk of the work on both. IBM owns the patents. I think they gave me about $1.5K each.
Bob Heil has a parametric Equalizer that will solve this issue, and a amplified speaker or headphones.
The West Mountain speaker has a headphone jack you can use.
The Yaesu FT-DX-10 has RF Roofing filters as well as DSP at RF and RF which sounds very good indeed. It is a bit more expensive that a IC-7300 but not by much (depending on your means).
It also has alot of bugs right now.
@@forgetyourlife Really? Ooh! Lets hear about those!
@@G7VFY join the Groups IO page about the dx10
@Steven H I wouldn’t by an ft-dx10 right now until they address the bug with an update. The last update actually broke the preferred way to switch bands. Yaesu needs to get it together.
@Steven H yep, me too. I’m going to just sit pretty with my 7300 for another 6 months and see what Yaesu does. What’s not so comforting is the many bugs that owners of the ft-101 and 101mp have been talking about for years now and nothing has been addressed on what is the 5000 dollar model! Yikes.
How about Mobile operation with ignition noises?
Generally your Noise Blanker will take care of the ignition noise. Most modern vehicles should not create ignition noise anymore.
Thank you. N0QFT
Shouting into landlines or cell phones is useless, since there are loudness limiters in both systems. You can shout, but the phone networks clip it right back down.
Western Mountain has a signal unit which comes in a box with no speaker.
i use several
K7AER
I am just shy of my 80th birthday. BUY the Icom 7300. I thought my triple conversion Icom transceiver with all the extras was "da bomb." I was SO happy with it that I thought NOTHING ON EARTH would be better. OMG... was I wrong. The DSP and little box with a new linear power supply made it eat dirt. Honestly... BUY the little box. Really. de KQ2E
Bhi DSPKR DSP Noise Reduction Speaker, has 8 settings as works very well
KEY THAT LIKE BUTTON!
Snap on torroids on all cables coming into your rig. Mike. power. Headphone or speaker. Coax..... RF noise can come in from any wires.
Diamond Cut Audio can do it, but it's expensive if you want to do it in real time. You'd need the Forensic version.
The noise reduction algorithms are getting better and better. Getting rid of echoes on recorded audio is technically possible using deconvolution, which is hideously complex to do. Takes serious computer power.
Turn down the RF gain and don't use the pre amp.
No, you don't have to pay hundreds of dollars to get realtime noise reduction, there's alot of open source utilities doing this.
RM noise uses AI to do this now, run RM noise through your PC and it will remove all the noise real time.
3:54 Nvidia RTX Voice
I never tried this. I will try. Thanks for the tip.
I was thinking the same thing.
Russian woodpecker? Sreams for it"s own video.