| Author |
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Galileo
| | Posted on Sunday, June 02, 2002 - 10:21 am: | 
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Has anyone had any experience with add on speech processors???? Also what about add on digital signal processors for recieve..thanks for the help, Tom Shaw |
jyd
| | Posted on Sunday, June 02, 2002 - 11:31 am: |
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there great!!! |
707
| | Posted on Sunday, June 02, 2002 - 4:08 pm: |
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Speech processors are a good addition to a radio in lieu of a "power mic". Make sure it's a "compressor" or "compressor/limiter" rather than a simple mic amplifier.
DSP on receive is good for separating the noise from a SSB or CW audio signal. The cheapest Radio Shack DSP box is marginally useful for the typical SSB user, and will allow you to get rid of some annoying background noise. Some more complicated arrangements allow you to selectively kill narrow bands of audio within your received signal. This is good to get rid of heterodyne. Some even higher end units will seek out heterodyne and automatically filter it out. DSP as an add-on to your receiver audio output is not as effective as a built-in type, like on newer HF and Communications receivers, which use DSP on the IF. |
Galileo
| | Posted on Sunday, June 02, 2002 - 11:14 pm: |
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Thanks guys for the help...Didnt mean to post this subject twice....I am looking to decrease a little background noise.... |
Biged
| | Posted on Monday, June 03, 2002 - 10:18 pm: |
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When you guys talk about reducing background noise with a speach proccesor, are you talking about during TX or RX? I would like to put one in my new 2510 if I knew it would make a difference in TX. I use a power mic on it because it sounds awsome with it, but I never liked all the background noise that comes with one. I have went through 3 echomax 2000's and 2 D104's because of that reason. I always ended up using an RK 56 or something of the like. While I am on the subject of power mic's, I also recieved a Turner plus3 power mic with my newest edition, are these mics any good. I heard it hooked up to the radio I got before the deal was ever even made and it did sound good. I just wanted to get everyone elses opinion...Eddie |
Barefoot
| | Posted on Tuesday, June 04, 2002 - 8:36 am: |
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I have a LINCOLN with a SP-1A speech processor and it does NOT do a thing for it I am goiing to pull it out |
bruce
| | Posted on Tuesday, June 04, 2002 - 11:01 am: |
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biged a audio prosser will INCREASE background noise on your transmitt audio now DSP on recive will CUT the noise on recive
barefoot the lincon from what i heard of them on the air has a good alc loop in it prossers work BEST on CHEEP radios |
jyd
| | Posted on Tuesday, June 04, 2002 - 11:38 am: |
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he probably has it adjusted wrong,mine is awsome. |
jyd
| | Posted on Tuesday, June 04, 2002 - 7:51 pm: |
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loud audio with a whisper |
Bigbob
| | Posted on Tuesday, June 04, 2002 - 8:34 pm: |
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I put a cbc processor in my eagle 2000 to much gain blew out preamp,BIGED try a 10-dal head on your tug-9 or tup-9 stand it will cut some b.g. noise,back down gain on stand,once you reach full modulation any additional gain increases sensitivity,thus back ground noise. |
jyd
| | Posted on Tuesday, June 04, 2002 - 9:03 pm: |
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good thing about speech processer adjustable input and output,no background noise and loud audio. |
707
| | Posted on Friday, June 07, 2002 - 12:17 pm: |
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I once had my shack in the utility room, with the washer and dryer...what a mess. I was trying to run a Sennheiser MD421u mic with a Daiwa RF440. I tried various mic/processor combinations, and ended up with a D-104 stand, with Calrad DM-9 head(my modification...very cool)a DJ external noise cancelling mic amp(trucker fave about 10 years ago), into the Daiwa RF speech processor. The noise canceller took care of the background, and the Daiwa maxed out the audio. All of this running into a RCI2950. The Sennheiser mic was relegated to the Siltronix 1011D or Hallicrafters SX-46A, through a DBX compressor/limiter(broadcast variety) where it made my AM audio sound better than the local radio station, as long as the laundry was done.... |
DeadlyEyes
| | Posted on Tuesday, June 11, 2002 - 1:11 am: |
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A speach processor is an electric circut that does the following. It takes the highs in your voice pattern and flattens them down. It takes the lows and pushes them up. In short it takes the extremes out and gives you more of the middle ground. It also makes your voice easier to understand. Listeners do not have the trying job of listening to shrill highs followed by low tones. This up and down listening can make your ears tired :-) |
bruce
| | Posted on Tuesday, June 11, 2002 - 6:15 pm: |
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do you meen high frequencys in voice or high volume? a processor of the SP-1 class only flatting the volume and has little efect on frequency although they are bandpassed and cut some highs and lows but this is not the main effect only a byproduct. |
DeadlyEyes
| | Posted on Tuesday, June 11, 2002 - 6:42 pm: |
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Re Bruce....
Without going into too much detail. The human voice is not of one frequency. Within the range of human vocal frequencies you speak in a combination of frequencies. Thus the high squeeky letters of a word vs the low base tone letters.
The human voice is a range of frequencies just as radios produce frequencies. Only the numan voice is on the low end of the frequency range and a radio generates millions of cycles per second.
A speach processor clips or compresses the frequency of the sounds not the loundness.
Example. A pre amp mike amplifies everything including background noise. A compressor mike in general does not pick and amplify the background noise. It only changes the voice that is speaking near it. Any amplification lies in making the mic and the mic more efficient. |
bruce
| | Posted on Wednesday, June 12, 2002 - 8:47 am: |
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A Speach processer as used on say a CB radio if it is working propley controles the output level of the audio being fed to the radio. Compression of frequency of audio if it was TRUE compression would meen you could take a 200-2000 HZ audio signal and compress the frequency range down to a set level like 200-400 HZ making it very hard to understand. As for background noise compression RASES the background noise now a noice cancling mike lowers it somewhat. Now one side effect is since most processers also CLIP the audio you MUST filter a cliped wave since it is a square wave not sinesoidal and has a very high harmonic content which would detract from the cleaness of the audio. The TEN-TEC processer does both a AGC loop for audio gain and clipping of the audio folowed by a 3khz cut off filter. The effect to the end user is a 2-3 db improvement in how loud the radio sounds. Now RF signal audio processing can result in a 9 db improvement but this is not easy to acheve and even though it can be added to any multimode radio would be fairly complex. At this time im running 3 of them 2 ten-tec and one made by cbint all work as they should.
Bruce |
Insider
| | Posted on Wednesday, June 12, 2002 - 1:40 pm: |
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I want to experiment with using my DBX compressor/limiter with my 2950. Does anyone know the value of the resistors or how to calculate the values I would need to make an attenuator network for the compressor's output?
Thanks for your help. |
ss8541
| | Posted on Wednesday, June 12, 2002 - 6:01 pm: |
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to state it simply, the processor takes the voltage peaks of the audio and compresses it while taking the voltage dips of the audio and amplifying that. audio freq isn't as big a factor as the audio voltage level. this gives more average audio voltage, which in turn gives more average rf votage(output). then on the rxing end the process is reversed leaving the audio output with increased average audio voltage, which in turn translates to increased average audio -power- out of the speaker.
and by 'average' voltage/power i don't mean rms or any of that. i mean 'average' as in the average of the actual voltage/power peaks during modulation. example would be radiox stock is capable of 35w ssb. with stock mic it averages 12w ssb with voice modulation(not saying aaaauuuudddiiioooo, but with normal speaking). with the addition of the sp1a, it may now average 18w ssb or more depending on how it is set. but it is still capable of only 35w peak ssb power. this is just an example, so no one quote this as what an ssb radio should do with a sp1a. |
Dozer
| | Posted on Sunday, July 07, 2002 - 9:15 pm: |
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Lot's of bang for your buck! I have installed the SP1 in my Ranger AR3500 radios as well as my HR2510 rigs with great results.As you may know the SP1 was made as an option by RF Linited for the AR3500 but works well in many but not all radios so they marketed it as a nother add on device to improve trasmit audio quality.The AR500 has such a great sound to begin with that it took me some time to take the chance on spending my time and money on the SP1.Once I did and checked the results on my test equiptment and heard the improvment on the other end I simply cant recomend it enough.Just my thought's. Good luck! |
Hoosier Cardinal
| | Posted on Sunday, July 07, 2002 - 11:51 pm: |
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I have a 3500 100 watter id like to install a SP-1A in. I just needed to hear another person with a 3500 that has used one and it looks like you had great sucess!! Now i need to set aside some $$ and get one for mine now!!! |
