Habious

Nola111,

It's got a "speaker out". I wonder what would happen if you ran that to a soundcard input (line in). Might have to use an attenuating cable to match levels but, don't see why it wouldn't work.

If the thing was a little more reasonably-priced, I'd get on and experiment but, $125.00 is an expensive experiment if it doesn't work!

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blckwdw

agreed it is a bit pricey, i have my mic already mounted and what not in my car though so I am not necessarily looking for a new mic, just a way to filter or stop the echo on the recieving end of the call.

Is there anything that can be wired in between the mic and controller? like actually soldered on to the mic wires them selves that would serve this purpose?

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Nola111

Don't think it would work as well like that b/c if you connect a powered speaker or headphones to the Solo, that speaker or headphones can produce audio on its own. If you connect to a line-in on a soundcard, you need a pc, and therefore Windows to get the sound out of it. Because you need Windows, you have to select your soundcard as your playback device. At that point, the best you can do is select the Solo as your recording device since you can't have two playback devices at once in Windows. As soon as you have two different devices for playback and record, the ability to cancel echo becomes theoretically impossible because your recording line is buffered, which introduces latency. Even though the latency may only be a few hundred milliseconds, it's more than enough to make a horrible echo and bad delay in the conversation (trust me I know... I tested another BT "solution" for several months before giving up on it).

The solution to having two different soundcards in Windows is that Phoenix SOHO (not SOLO) mentioned earlier in the thread. That will cancel echo and delay. One guy on here has one and says it works well. But you do have to have a PCI slot for it. If you buy the SOHO, you can pretty much get any mic you want (although you still want to get one with good attenuation so noise canceling can be achieved.

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Habious

Yup but, I don't have a PCI slot...let alone a FREE one!

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Nola111

You're probably better off sticking with your Motorola unit for now anyway. This is the third pc BT phone solution I've tested, and nothing against the programmers b/c the software is definitely good, but Windows is just not a good platform for a full handsfree BT solution, mainly for the reason I mentioned above. It's livable if you have everything on one soundcard, but units like your Motorola and units made by Parrot, and OEM units that come built-in to the latest model cars, that are all dedicated specifically to this function will yield MUCH better results than a pc when it comes down to the actual conversation part of the whole system. And isn't that what matters most?

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smeesseman

Echo cancellation is one of the major OEM obstacles to introducing handsfree kits into the market. The complexity of software based algorithms to handle ECNR is beyond normal imagination, and only a handful of companies have tackled this. Off the top of my head, there was Clarity, Inc., who was bought up by CSR, and Wavmakers, Inc., who was bought up by QNX Software Systems. Other vendors may have proprietary solutions, not sure on that one. HF kit manufacturers spend thousands of man hours working on ECNR, to get things right, and that's on 1 platform, 1 cpu, 1 bt chip, you get my point. To implement on a Windows system, with so many unknowns (audio hardware, bt chip, etc...) is nearly impossible. With that all said though, with EC algorithm, both the recording device and the playback device must be buffered and processed, so using 2 soundcards will be possible in this situation, with the correct parameters.
To get to the point now - Microsoft provides a low-end software EC system, not sure whose algorithm it is, but we plan to look into implementing this in the future.

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HuseyinOzsut

Well I know that it is very hard to have echo canceling; but a simple program which will make the system half-dublex should solve the problem. When there is sound coming from speakers (in this case when the person calling us is speaking) the program will mute the mic. And when the sound stops it will un mute so I'll be able to talk! By this way there shouldn't be echos. But I couldn't find also this kind of program. Can you help me with that? Or isn't there any program like this?

johnk

Why is the echo cancellation so hard/expensive when my $30 speakerphone from 10+ years ago works fine?

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carlb99

Here's a scenario I'd like to see. But, I realize that it's probably not workable because of complexity of devices, etc.:

I have my noise cancelling bluetooth headphone (I love my Jawbone) paired to my phone while I'm out and about, away from the car. When I get in and start-up my car, the CarPC recognizes this scenario and can unpair my headphone-phone and create separate pairing with each. Both phone and headphone paired with the PC. If that was possible, I can then use the excellent properties of my bluetooth headphone with the car integration that the CarPC provides.

I know I can use the Jawbone with my PC for Skype, for example. I don't know if I can have multiple Bluetooth pairings with my PC. If that is possible, maybe a working model for this might be to have a dedicated car Jawbone. When I get to my car, I power off the "walking" Jawbone. My car Jawbone is already powered up and pairs to the PC as soon as I start the car. The phone then pairs to the CarPC. Then, I'm off to the races...

Possible?

Nola111

Your speakerphone from 10+ years ago, and most other speakerphones, are built on a half-duplex concept. In simplest terms, when the party on the other end of your call on speakerphone is speaking, they don't hear and echo of themselves b/c the mic is automatically muted while they're speaking. This is the basis of half-duplex.

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Salmizar

May want to look at http://forums.fluxmedia.net/showthre...?t=3196&page=1
I have purchased and tested the Phoenix SOHO echo canceling card. Seems to work well.

jdmagoo1

we are hoping for a USB solution, has anyone actually tried the SOLO?

LinuxRacr

This is an awesome external implementation of the PCI card so that you don't require a PCI slot!!

Anyone know how to use the USB port only to supply 5v power to the card?

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Salmizar

Take a USB cable, cut it in half. Red is +5V, black is ground. White and green are for data.

slashdot

... little consideration and an invite to test it by yourself....

Have anyone tried before to mute speakers during a cell call?
You can see that the echo exist anyway.

Another interesting thing is to understand why the echo si present for one time only
for example, the caller say "hello" and will ear himself say "hello" for one time only.

this is not exactly what an Larsen effect really is.
Normally Larsen effect produce a several decreasing signal, 'cause is a circular effect from the mic to the speakers, until it disappear.

So i presume there is a bug in the bluetooth stack that resend the communication at the caller also

sorry for my pizza's english

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