Re: Audio path gain, was: Re: Bluetooth module

2011-02-07 Thread Hrabosh

Yes, I really meant bass fix. I have replaced each 1uF cap with 2x 47uF
caps in parallel. They are isolated by heat-shrinking tube and
everything even fit under the metal cover.

It really helped a lot, no problem using my FR as portable player now.

I have taken some pictures ... anyone interested? I may put them online
if so.

BTW... although my phone seems not to be affected by GSM buzz problems,
I did buzz fix also just for shure.


Zb.


Martix píše v Po 07. 02. 2011 v 16:31 +0100:
> Did you really meant bass fix? http://wiki.openmoko.org/wiki/GTA02_bass_fix
> Or buzz fix: http://wiki.openmoko.org/wiki/Buzz_Fix ?
> 
> 
> 2011/2/6 Hrabosh :
> > I was doing bass-fix to my Freerunner today so I did the the same
> > measurement with generator again. I run "Voice notes" and set the
> > generator so that the amplitude was simmilar to the amplitude of voice,
> > captured by the microphone. LAter on I was listening to the files
> > recorded when setting the generator and the 1kHz beep was clean and the
> > volume was OK.
> 
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Re: Audio path gain, was: Re: Bluetooth module

2011-02-07 Thread Martix
Did you really meant bass fix? http://wiki.openmoko.org/wiki/GTA02_bass_fix
Or buzz fix: http://wiki.openmoko.org/wiki/Buzz_Fix ?


2011/2/6 Hrabosh :
> I was doing bass-fix to my Freerunner today so I did the the same
> measurement with generator again. I run "Voice notes" and set the
> generator so that the amplitude was simmilar to the amplitude of voice,
> captured by the microphone. LAter on I was listening to the files
> recorded when setting the generator and the 1kHz beep was clean and the
> volume was OK.

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Re: Audio path gain, was: Re: Bluetooth module

2011-02-06 Thread Hrabosh
Al Johnson píše v Pá 04. 02. 2011 v 13:46 +:

> How did you pick 0.5mV as a suitable input amplitude? Measurement of peaks 
> when talking?
> 
> 

It was completely wrong! I did some internet search and found that
micropohone like that in FR usually produce signal with amplitude in
tens of mV. I was wondering if the singal was only 0.5mV it wouldn't
probalby get distorted so easily - so I went to check my generator and
saw that the attenuator was set incorrectly and so the signal was
probably way higher than 0.5mV. 

I was doing bass-fix to my Freerunner today so I did the the same
measurement with generator again. I run "Voice notes" and set the
generator so that the amplitude was simmilar to the amplitude of voice,
captured by the microphone. LAter on I was listening to the files
recorded when setting the generator and the 1kHz beep was clean and the
volume was OK.

I rewrite the text and put there all pictures from the scope I made.

http://hnet.endofinternet.net/elektro/Freerunner/ALSA/sound_setting.html

Seems that the sidetone may be set to 2 instead of 1, but mic should
stay 0.

Thanks for your question !

Zb.



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Re: Audio path gain, was: Re: Bluetooth module

2011-02-04 Thread Al Johnson
On Sunday 23 January 2011, Hrabosh wrote:
> Al Johnson píše v Pá 21. 01. 2011 v 10:34 +:
> > On Friday 21 January 2011, Hrabosh wrote:
> > > Hi guys,
> > > 
> > > yesterday I opened my freerunner to check whether mine FR is affected
> > > by R3004 issue [1].
> > > 
> > > It was, I put a piece of wire there instead of those two caps and
> > > volume got better!
> > > 
> > > I have also connected sine wave from generator to the WD8753 mic input
> > > and cheched it on the WD8753's output with the oscilloscope. It seemes
> > > that the audio codec chip gets into trouble (distortion, oscillations)
> > > if the overall audio path has higher gain than 1. I'm going to write
> > > more about this soon, with the scope pictures included (taken by my
> > > camera, I don't have DSO at home :-/ )
> > 
> > That would be interesting to see, but your summary seems wrong or perhaps
> > oversimplified. Distortion is inevitable if you overload an amp, and
> > oscillation isn't unusual immediately after overload. It isn't a function
> > of the overall path gain though. The wolfson has a chain of amps and
> > volume controls, and it only needs overload at one of them to introduce
> > distortion. Stick the gain too high on the first stage (mic input) and
> > the distortion won't go away no matter how far you turn down the gain on
> > later stages. This has been a long standing problem with the default
> > volume settings.
> 
> Yes, it is oversimplified. It is obvious that you can't fix distortion
> by lowering the gain of next-in-chain amplifier. You are just
> controlling the volume of already distorted signal.

If it was that obvious we wouldn't have had default settings guaranteed to 
cause distortion earlier than necessary in the first place. It seems it's only 
obvious to those of us with a grounding in analogue electronics, or those who 
spend time with guitar amps and similar.

> I put that picture from my scope with a short description to my web
> page, here:
> 
> http://hnet.endofinternet.net/elektro/Freerunner/ALSA/sound_setting.html
> 
> I was very surprised how LOW I had to set the audio controls to get rid
> of distortion:
> 
> Mic2: 0
> Sidetone: 1
> 
> Strange ...

How did you pick 0.5mV as a suitable input amplitude? Measurement of peaks 
when talking?


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Re: Bluetooth module

2011-02-03 Thread Hrabosh
Petr Vanek píše v So 22. 01. 2011 v 05:51 +0800:
> On Fri, 21 Jan 2011 07:32:40 +0100
> Hrabosh  (H) wrote:
> 
> >But ... when I was dismounting the phone, I dammaged the bluetooth
> >module. The module itself may be OK, but the flex cable is torn off. 
> 
> ahoy,
> 
zdar!

> the flexible PCB for BT does seem to be able to crack very easily,
> mine broke about a year ago. One day, i would love to sit down and fix
> it but as it is quite tedious job under a microscope i have been
> procrastinating this as much as i could. Besides, it helped me to stop
> worrying about the FSO BT support and i also stopped spamming people
> on public transport with tux images via BT ;))
> 

I got dead motherboard with BT module on it from Golden Delicious. So I
replaced it earlier this week and everything seems to work. I was trying
to pair my FR with my car radio today while bored in traffic jam - so I
run the search procedure and found 4 mobile phones and 3 hands-free
sets :-)

BTW.. I've just received a bunch of E-mails from last 2 weeks or so.
Strange ...

Zb.


> Petr
> 
> 
> 
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Audio path gain, was: Re: Bluetooth module

2011-02-03 Thread Hrabosh
Al Johnson píše v Pá 21. 01. 2011 v 10:34 +:
> On Friday 21 January 2011, Hrabosh wrote:
> > Hi guys,
> > 
> > yesterday I opened my freerunner to check whether mine FR is affected by
> > R3004 issue [1].
> > 
> > It was, I put a piece of wire there instead of those two caps and volume
> > got better!
> > 
> > I have also connected sine wave from generator to the WD8753 mic input
> > and cheched it on the WD8753's output with the oscilloscope. It seemes
> > that the audio codec chip gets into trouble (distortion, oscillations)
> > if the overall audio path has higher gain than 1. I'm going to write
> > more about this soon, with the scope pictures included (taken by my
> > camera, I don't have DSO at home :-/ )
> 
> That would be interesting to see, but your summary seems wrong or perhaps 
> oversimplified. Distortion is inevitable if you overload an amp, and 
> oscillation isn't unusual immediately after overload. It isn't a function of 
> the overall path gain though. The wolfson has a chain of amps and volume 
> controls, and it only needs overload at one of them to introduce distortion. 
> Stick the gain too high on the first stage (mic input) and the distortion 
> won't go away no matter how far you turn down the gain on later stages. This 
> has been a long standing problem with the default volume settings.

Yes, it is oversimplified. It is obvious that you can't fix distortion
by lowering the gain of next-in-chain amplifier. You are just
controlling the volume of already distorted signal.

I put that picture from my scope with a short description to my web
page, here:

http://hnet.endofinternet.net/elektro/Freerunner/ALSA/sound_setting.html

I was very surprised how LOW I had to set the audio controls to get rid
of distortion:

Mic2: 0
Sidetone: 1

Strange ...



> 
> > But ... when I was dismounting the phone, I dammaged the bluetooth
> > module. The module itself may be OK, but the flex cable is torn off.
> > 
> > Don't you have any idea where can I buy some spare?
> 
> I've not seen anyone list them as a spare for sale, but any of the 
> distributors might have them available.

Nicholas from Golden Delicious answered my desperate E-mail :-)





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Re: Bluetooth module

2011-02-03 Thread Petr Vanek
On Fri, 21 Jan 2011 07:32:40 +0100
Hrabosh  (H) wrote:

>But ... when I was dismounting the phone, I dammaged the bluetooth
>module. The module itself may be OK, but the flex cable is torn off. 

ahoy,

the flexible PCB for BT does seem to be able to crack very easily,
mine broke about a year ago. One day, i would love to sit down and fix
it but as it is quite tedious job under a microscope i have been
procrastinating this as much as i could. Besides, it helped me to stop
worrying about the FSO BT support and i also stopped spamming people
on public transport with tux images via BT ;))

Petr



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Re: Bluetooth module

2011-01-21 Thread Al Johnson
On Friday 21 January 2011, Hrabosh wrote:
> Hi guys,
> 
> yesterday I opened my freerunner to check whether mine FR is affected by
> R3004 issue [1].
> 
> It was, I put a piece of wire there instead of those two caps and volume
> got better!
> 
> I have also connected sine wave from generator to the WD8753 mic input
> and cheched it on the WD8753's output with the oscilloscope. It seemes
> that the audio codec chip gets into trouble (distortion, oscillations)
> if the overall audio path has higher gain than 1. I'm going to write
> more about this soon, with the scope pictures included (taken by my
> camera, I don't have DSO at home :-/ )

That would be interesting to see, but your summary seems wrong or perhaps 
oversimplified. Distortion is inevitable if you overload an amp, and 
oscillation isn't unusual immediately after overload. It isn't a function of 
the overall path gain though. The wolfson has a chain of amps and volume 
controls, and it only needs overload at one of them to introduce distortion. 
Stick the gain too high on the first stage (mic input) and the distortion 
won't go away no matter how far you turn down the gain on later stages. This 
has been a long standing problem with the default volume settings.

> But ... when I was dismounting the phone, I dammaged the bluetooth
> module. The module itself may be OK, but the flex cable is torn off.
> 
> Don't you have any idea where can I buy some spare?

I've not seen anyone list them as a spare for sale, but any of the 
distributors might have them available.

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Re: Bluetooth module

2011-01-20 Thread Hrabosh

Sorry:

[1]
http://lists.openmoko.org/pipermail/community/2009-August/052914.html



Hrabosh píše v Pá 21. 01. 2011 v 07:32 +0100:
> Hi guys,
> 
> yesterday I opened my freerunner to check whether mine FR is affected by
> R3004 issue [1]. 
> 
> It was, I put a piece of wire there instead of those two caps and volume
> got better! 
> 
> I have also connected sine wave from generator to the WD8753 mic input
> and cheched it on the WD8753's output with the oscilloscope. It seemes
> that the audio codec chip gets into trouble (distortion, oscillations)
> if the overall audio path has higher gain than 1. I'm going to write
> more about this soon, with the scope pictures included (taken by my
> camera, I don't have DSO at home :-/ )
> 
> 
> But ... when I was dismounting the phone, I dammaged the bluetooth
> module. The module itself may be OK, but the flex cable is torn off. 
> 
> Don't you have any idea where can I buy some spare? 
> 
> Thanks, Zbynek
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> [1]http://lists.openmoko.org/pipermail/community/2009-August/052914.html
> 
> 
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Bluetooth module

2011-01-20 Thread Hrabosh
Hi guys,

yesterday I opened my freerunner to check whether mine FR is affected by
R3004 issue [1]. 

It was, I put a piece of wire there instead of those two caps and volume
got better! 

I have also connected sine wave from generator to the WD8753 mic input
and cheched it on the WD8753's output with the oscilloscope. It seemes
that the audio codec chip gets into trouble (distortion, oscillations)
if the overall audio path has higher gain than 1. I'm going to write
more about this soon, with the scope pictures included (taken by my
camera, I don't have DSO at home :-/ )


But ... when I was dismounting the phone, I dammaged the bluetooth
module. The module itself may be OK, but the flex cable is torn off. 

Don't you have any idea where can I buy some spare? 

Thanks, Zbynek





















[1]http://lists.openmoko.org/pipermail/community/2009-August/052914.html


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Re: Hardware Recommendations - Desktop Bluetooth Module

2007-08-01 Thread Ian Stirling

Jeff Rush wrote:

Jonathon Suggs wrote:

Does anyone have a good recommendation for a  Bluetooth module/adapter 
for the desktop ?  Features: Bluetooth 2.0, good support under Ubuntu, 
and also provide most all of the Bluetooth profiles.


I don't mind a dongle, but would think that having an internal card 
would be less likely to get broken...since a dongle would always be 
protruding from the case.  Thoughts, opinions?  What does everyone 
else use?



I too would like to find such - a nice PCMCIA/PCCARD to put into my 
laptop and forget about, as opposed to a USB dongle hanging out.  
Non-USB BT seems rare but I'm still looking and would appreciate notice 
if anyone gets there first.




There are very short USB dongles that stick out 10mm or so.

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Re: Hardware Recommendations - Desktop Bluetooth Module

2007-08-01 Thread Jeff Rush

Jonathon Suggs wrote:
Does anyone have a good recommendation for a  Bluetooth module/adapter 
for the desktop ?  Features: Bluetooth 2.0, good support under Ubuntu, 
and also provide most all of the Bluetooth profiles.


I don't mind a dongle, but would think that having an internal card 
would be less likely to get broken...since a dongle would always be 
protruding from the case.  Thoughts, opinions?  What does everyone else 
use?


I too would like to find such - a nice PCMCIA/PCCARD to put into my laptop and 
forget about, as opposed to a USB dongle hanging out.  Non-USB BT seems rare 
but I'm still looking and would appreciate notice if anyone gets there first.


-Jeff


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Re: Hardware Recommendations - Desktop Bluetooth Module

2007-07-31 Thread Giles Jones


On 31 Jul 2007, at 22:38, Jonathon Suggs wrote:

Does anyone have a good recommendation for a  Bluetooth module/ 
adapter for the desktop ?  Features: Bluetooth 2.0, good support  
under Ubuntu, and also provide most all of the Bluetooth profiles.


I don't mind a dongle, but would think that having an internal card  
would be less likely to get broken...since a dongle would always be  
protruding from the case.  Thoughts, opinions?  What does everyone  
else use?


-Jonathon


I have a Belkin F8T002 ver 2 USB module that works well. I believe  
they mostly use a standard chip. Just like USB chips are OHCI etc...




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Re: Hardware Recommendations - Desktop Bluetooth Module

2007-07-31 Thread Giles Jones


On 31 Jul 2007, at 22:49, Giles Jones wrote:



On 31 Jul 2007, at 22:38, Jonathon Suggs wrote:

Does anyone have a good recommendation for a  Bluetooth module/ 
adapter for the desktop ?  Features: Bluetooth 2.0, good support  
under Ubuntu, and also provide most all of the Bluetooth profiles.


I don't mind a dongle, but would think that having an internal  
card would be less likely to get broken...since a dongle would  
always be protruding from the case.  Thoughts, opinions?  What  
does everyone else use?


-Jonathon


I have a Belkin F8T002 ver 2 USB module that works well. I believe  
they mostly use a standard chip. Just like USB chips are OHCI etc...





Sorry, that's F8T003 ver 2 (very small writing on case).


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Hardware Recommendations - Desktop Bluetooth Module

2007-07-31 Thread Jonathon Suggs
Does anyone have a good recommendation for a  Bluetooth module/adapter 
for the desktop ?  Features: Bluetooth 2.0, good support under Ubuntu, 
and also provide most all of the Bluetooth profiles.


I don't mind a dongle, but would think that having an internal card 
would be less likely to get broken...since a dongle would always be 
protruding from the case.  Thoughts, opinions?  What does everyone else use?


-Jonathon

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