Hi Gurus,
I happen to drop my XDA2s into a pond. Managed to get it working again except for the qwerty keypad blue light and the speaker is not working. (However the handsfree is still functional).
I am trying to search for any schematics which show how the Philips audio chip is connected to the main speakers. (Tried the datasheets, but can't seem to figure it out.) Would appreciate if anyone who has it can share it with me.
As for the Keypad LED, how is it driven by ? I know that there is a LED driver chipset on the board, but i think it is more for the LCD panel.
Can anyone advise ?
Thanks.
Hi!
I got a Touch dual a few weeks back, and have been trying out different sound recording software. The sound seem to come out alright when the source is at very low levels, but the moment you speak a little too loud - or record a guitar for instances, the sound peaks, and then distorts making it unlistenable. Does anyone know if there excists a patch of some sorts that let's you control the input volume so you avoid this kind of horrible distortion?
This is pretty important to me as im a musician and need to record small demo snippets. This problem seem to be in every recording software i've tried - even the built in one. The phone is brand new and i actually had it for a repair for another problem, and the problem residues.
By the way - this Wifi business, is it ever gonna work on the NIke? is it even physically possible?
Thanks alot,
Psych
im in the same boat, as a guitarist.
i asked this question long ago and never got a definitive answer so i came to the conclusion it wasnt possible with the hardware.
http://wiki.xda-developers.com/index.php?pagename=Sound Recorder Bible
if you can find anything in there that is helpful please let me know.
wifi is possible. when? i dont know. how long is a piece of string?
Many guys are looking for a method of recording both sides of voice during a call. But it seems that HTC mobile phones including X1 Xperia don't support internal voice recording. Someone said that's hardware limitation. The only way to recording both sides voice is by turning on speaker.
I got an idea about fix this issue by adding simple circuit to X1 Xperia. Please see the attached file. It's a circuit diagram. As illustrated in the diagram, the signal of other side is introduced by a capacitance. Two voices, one from you, the other from the participant of your call, are mixed together and go to the ADC(analogue/digital converter).
Someone may be concerned about the self-excitation by the feedback. I think the phone works well even if you turn on the speaker, that would introduce the feedback. So the phone will work well if you introduce the signal via electronic form.
I haven't implemented this idea. Guys, please help to review this idea, and make the solution more applicable.
Thanks All!
(Diagram updated, potentiometer added.)
Lol
Maybe implement it and let us know I have a feeling that even with the decoupling capacitor it's still going to cause horrendous feedback. The speaker output will probably still excite the microphone and since the microphone is going to be d.c. shifted into the positive because of the lack of a negative supply. And that's without even knowing for certain the circuitry used here.
It's very interesting idea to make a fix for internal voice recording for X1. Usually speakerphone handsets are factory equipped with some circuitry which avoids unwanted feedback. I doubt that X1 doesn't have one.
You can always experiment with any cheap old phone to check if your idea has a chance to work. Maybe some potentiometer should be used to adjust depth of the feedback.
alias_neo said:
Maybe implement it and let us know I have a feeling that even with the decoupling capacitor it's still going to cause horrendous feedback. The speaker output will probably still excite the microphone and since the microphone is going to be d.c. shifted into the positive because of the lack of a negative supply. And that's without even knowing for certain the circuitry used here.
Click to expand...
Click to collapse
I don't quite understand what you mean. The capacitor between the speakerphone and microphone isn't a decoupling capacitor. It's a coupling capacitor for audio signals. It let audio signals go through and blocks direct current.
And could you explain more about negative supply? As far as I know, symmetrical power supply isn't common in nowadays electric appliance with battery. It seems that self-excitation has nothing to do with negative supply.
Thanks neo and Macko for your reviewing. Experimenting on an old phone is really a good idea! But it is still difficult since we don't know the exact circuitry inside X1.
It's really necessary to have potentiometer to control the amount of signal to be introduced. Thanks Macko!
so phones which cost nearly as much as a laptop cant do smthg that cheap phones can do?
this is a very necessary feature and learning that its hardware limitation is quite disappointing.
what about presenting this idea to htc so they can learn smthg
Nocturnal310 said:
so phones which cost nearly as much as a laptop cant do smthg that cheap phones can do?
this is a very necessary feature and learning that its hardware limitation is quite disappointing.
what about presenting this idea to htc so they can learn smthg
Click to expand...
Click to collapse
X1i is far more expensive than most laptops in discount stores and yes, seems that X1 can't do what SOME of cheaper phones do.
Dear HTC and SE: this is very very ugly dysfunction that XPERIA can't record calls properly! My wife's Nokia E51 does it perfectly. SHAME.
BUT caution please!
I've just done some research and found quite good working software solution of this issue. The problem is that signal from speaker isn't directly provided to DAC, so X1 just records what the mic "hears" from speaker, but if we use headphone or bluetooth headset, then recorded speech volume is far too low. But by applying some dynamics filtering on signal we can achieve desired gain of low volume part.
Here are instructions for volunteers:
- download and install some audio editor, for example CoolEdit
- download your recording from phone, open it in editor; low parts of wave are words of interlocutor
- apply a dynamic filtering as shown below:
- here are the results; as You see, low volume speech is gained by lots of dB, while your speech is almost untouched
My idea is to write some application working in background (as a service) which automatically applies such dynamic filtering DURING recording of a call. This is the best approach, but of course the same results can be reached by postprocessing.
Macko:
How is the voice quality after processing? I think it has some limitations.
sunshaking said:
Macko:
How is the voice quality after processing? I think it has some limitations.
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Click to collapse
Both sides are a bit distorted, which is unavoidable (dynamic processing distorts spectral envelope of signal) but acceptable. Of course all background sounds from opposite side are also gained, so do not talk to somebody who's mowing grass in the backyard
very interesting macko....if u can make such an app for X1..it ll be very useful and popular
Just downloading SDK and getting to work.
makro it is impractical to be forced to process all records. very bad for HTC
sunshaking said:
I don't quite understand what you mean. The capacitor between the speakerphone and microphone isn't a decoupling capacitor. It's a coupling capacitor for audio signals. It let audio signals go through and blocks direct current.
And could you explain more about negative supply? As far as I know, symmetrical power supply isn't common in nowadays electric appliance with battery. It seems that self-excitation has nothing to do with negative supply.
Thanks neo and Macko for your reviewing. Experimenting on an old phone is really a good idea! But it is still difficult since we don't know the exact circuitry inside X1.
It's really necessary to have potentiometer to control the amount of signal to be introduced. Thanks Macko!
Click to expand...
Click to collapse
This is exactly my point. Sorry I wasn't clear. As you say, no negative supply because we are running off of a battery. The signal itself is still an A.C. signal, so, in order to fit it within the confines of our supply it has to be DC shifted into the positive region yes? My point was that this DC level shift will be filtered by the capacitor for the reasons you gave, and so distorting the signal.
http://www.aray.cn/archives/3246
Studying how to disassemble X1.
I've disassambled my X1, but I can't find the microphone.
Here are two photos that might have micrtophone. I guess the microphone is attahed on the right side. But I really can't find it.
Haven't taken my X1 apart yet, but from the outside, the microphone is in the small hole/dent under the "OK" hardware button.
Anyone?
Has anyone found a solution to this hardware problem yet? I've been trying a hundred things with no success.
http://www.ifixit.com/Teardown/Nexus+7+Teardown/9623/1
I was just brainstorming about how to add a vibration motor to the Nexus 7, it's the only thing I like better about the N10. I was looking at the above link but I'm not experienced enough to know where I would hook one up.
It also seems that most vibration motors come as a part of the phone loudspeaker, so I don't know how that would work with the two drivers in the back of the N7. Can anyone shed light on whether this is possible?
Hi I was wondering if there was a fix or something to tweak the level of sound the phone records when you are recording a video. Since every time I want to record videos in music festivals or concerts the bass would be too loud and distorts the sound unlike other phones. If anyone does know an answer to this it would be much appreciated! TIA
i've seen several people ask the same question, however nobody seems to be able to answer the question.
i'd like to know this as well.
Not sure about that but a ghetto workaround i do when recording audio or video in loud environments is to cover the mic with something, like cloth or a case or your finger or something to reduce the input volume of the sound.. So you can do that in the mean time, but I'm sure there must be a way to change it..
vikramkhalsa said:
Not sure about that but a ghetto workaround i do when recording audio or video in loud environments is to cover the mic with something, like cloth or a case or your finger or something to reduce the input volume of the sound.. So you can do that in the mean time, but I'm sure there must be a way to change it..
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Click to collapse
I have tried using my finger to block the mic but that did not do much, I have not tried the tape method yet so I might try that sometime.
bump, anyone else figure out any solution to this?
So , everyone who has bought the phone has accepted the fact that you cannot take a video ( cause the sound is awful ) ? It's the reason that i want to sell it,battery custom kernel undervolt and such , sd slot you learn live with it but i cannot accept it that there is no fix for that thing. It is driver issue? it is the way lg put the mic? it is faulty mic? Is there any single person who have managed to take a nice video with acceptable sound in video recording? Any help will enlighten many, i am sure.