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Old 06-24-2017, 03:33 AM   #121
george graves
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Oh - BTW - just ran into this this week. If you need some shielding, I stumbled upon a DYI electric guitar making forum. And they use this copper adhesive sheets. Didn't know they existed. Google for "copper adhesive guitar sheets" and you should find it.
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Old Yesterday, 09:35 AM   #122
jaysterling
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Quote:
Originally Posted by tuckerware View Post
random observation - Bluetooth connection is super fast upon startup. Phone connects within a couple seconds after radio power. Way faster than my other cars with factory BT.

Jay, a little feedback and would be curious as to experience of others:

Volume when on a phone call is much quieter than with other audio. For instance, if listening to Pandora and I receive a call it is barely audible until I raise the volume. Then, I must quickly lower as the call ends so it isn't crazy loud.

Caller on the other side will get an echo when speaking. As in when my wife calls me it sounds just fine in the car but she is getting an echo on her side.

Let me know if you need clarification on either issue.
Volume is tricky. As was mentioned, iOS maintains separate volumes for music playback vs. phone calls and Siri (not sure what Android does here). I do have some control over the relative volumes of the two BT profiles (streaming vs. phone calls), and I messed with this as I noticed the level on phone calls was lower even when both iOS session volumes were at 100%. After adjusting this (I think a +3 or +6dB bump on phone calls) I was pretty happy with the level matching, and that's what you have.

So try turning up the volume on your phone when in a phone call and make sure it's all the way up. I wish there was a way to disable the phone volume and have everything forced to 100% but alas there's no way to do that that I can see. I would be interested to know how it works in your other OEM radios where you say this isn't an issue. When you connect to these, does the volume change on your phone?

There are default levels like Jim pointed out, and I have those values set to 100%, but then I found iOS doesn't honor them and it remains at whatever level it was at prior to connection.

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Originally Posted by earthwormjim View Post
Noise cancellation to prevent echo'ing is usually handled by the bluetooth device. Jay might need to check if there is a setting for this in the bluetooth module's firmware.

You might try a more directional mic too, and aim it at your mouth better, it's pretty hard to cancel audio with Bluetooth, there's so many delays in the system.
The Echo canceller is enabled on the module. I have had one or two the other end complained to me about an echo, but then most of them have had no complaints. Not really sure on that one other than CSR's EC isn't converging for some reason. The delays really shouldn't be an issue for the module though since there should be negligible input and output latencies from the chip's perspective - everything around it is analog.

Anyway Travis, if it's always an issue for you, let me know and I'll make sure there's nothing else I can do. The more directional mic also might help.
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Old Yesterday, 10:01 AM   #123
tuckerware
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Originally Posted by jaysterling View Post
So try turning up the volume on your phone when in a phone call and make sure it's all the way up. I wish there was a way to disable the phone volume and have everything forced to 100% but alas there's no way to do that that I can see. I would be interested to know how it works in your other OEM radios where you say this isn't an issue. When you connect to these, does the volume change on your phone?
I'll try that. Obviously not ideal from a hands-free functionality standpoint but curious to see how that impacts volume.

I'll say that no BT system I have works perfectly, OEM or not. They all have weird quirks. I don't have these volume issues on the other cars but even the otherwise excellent Ford system does an odd thing: it maxes ringer volume when it connects. Strange, since the phone doesn't even use the ringer when synced. Maybe it just maxes all volumes to 100% but I've never had a BT device adjust this value. Mornings after result in a very loud alarm on my phone when I forget to lower it back down.

Bluetooth calling is pretty low on the totem poll for me so these are minor issues personally. For those that spend a lot of time on the phone while driving this might be more impactful.

My priority was much more on music and especially podcasts. Podcasts sounded so bad when using FM or tape adapters. The audio quality is in a different league now.
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Old Yesterday, 10:40 AM   #124
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You’re microphone may also be a factor, and quality of the cell connection. Try several calls and if possible a different mike to be sure. BT phone connection quality with the board I’ve been using has been great, with the top down.
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Old Yesterday, 05:12 PM   #125
earthwormjim
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Originally Posted by jaysterling View Post
The Echo canceller is enabled on the module. I have had one or two the other end complained to me about an echo, but then most of them have had no complaints. Not really sure on that one other than CSR's EC isn't converging for some reason. The delays really shouldn't be an issue for the module though since there should be negligible input and output latencies from the chip's perspective - everything around it is analog.

Anyway Travis, if it's always an issue for you, let me know and I'll make sure there's nothing else I can do. The more directional mic also might help.
Might be hard to get good cancellation with all the different setups people have with one mic. You might need mic placement instructions for people, and tune things around that?

There's also provisions for two mics, and CSR says two mics are the main component of their noise cancellation. Maybe a mic inside the radio might help?

Their echo patents also talk about the mic being very close to the noise source. Not sure what to make of that, maybe too directional of a mic won't work for their acoustic echo cancellation?
https://www.google.com/patents/US9280983
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