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Second mic in o3d

Hey there.
Since i bought my o3d, i noticed there is a small hole next to the power button so I searched and found out that it's a mic and its only used for stereo sound recording. I was wondering if there's a tweak out there which will make use of it as an active noise cancellation mic instead as this would be far more useful.
Thanks
Sent from my LG-P920 using XDA

Actually that mic is for noise cancellation ,am not sure whether its using for stereo recording .But its mail purpose is noise cancellation . Now a days many smart phone have two mics.

Is any idea for enabling stereo sound recording from two sources (main mic & sub mic) at once?
LGCamera can enable but only one at once; sub mic (camcorder) or main mic (microphone) never both
This would be very COOL!

Microphone and noise cancel microphone

I have some problems when I rec a video I have a lot of noise.
Example
At the same moment my wife rec video with LG L3 and her videos have an excelent audio but my videos not.
Does I have problem with the noise cancel microphon. Or how can I chech if its work or modified the rec volumen.
Regards
Enviado desde mi LG-P925g usando Tapatalk 2

Hi,
Optimus 3D does not have noise cancellation. the second pin hole that you see is for the second microphone, which i think is used only during video recording so that we have stereo sound.
schubeir

@wawis, for gain mic you can use "Hidden Menu" Device Test/ Sound Test/ Audio CAL Tool/ SetGain/ by changing AMIC and D_MIC values for "sub mic".
You must remember the changes will be reseted by reboot device
@schubeir, unfortunatelly main mic and camcorder mic don't work both together as stereo sound but should.

Has anyone tried using an external mic for sound? Sometimes I record video of live music and sound definitely could be better...

That's the point O3D not have noise cancel saddly.
Lg l3 have it
I will try hidden menu settings
Enviado desde mi LG-P925g usando Tapatalk 2

Me too, thanks.
I am still curious how well a plug-in mic would help. Maybe a small one I could keep in my pocket if I plan to shoot some video.

This is my old topic:
http://forum.xda-developers.com/showpost.php?p=36665753&postcount=1
I will try this settings on the Iron Maiden concert (03.07.2013) in Poland.

Cool, I'll try it. Go Eddie!

Audio recorded clips volume is too low

Hello, when i record any voice with smart voice recorder, the volume of recorded voice is very very low. I have used it to record my class lectures. But now i'm unable to listen as the volume of the clips is too low..
Any solution?
I'm using stock kitkat
xt-1033

[email protected] said:
Hello, when i record any voice with smart voice recorder, the volume of recorded voice is very very low. I have used it to record my class lectures. But now i'm unable to listen as the volume of the clips is too low..
Any solution?
I'm using stock kitkat
xt-1033
Click to expand...
Click to collapse
I found my Moto G to have a similar problem with the stock app, recorded audio was almost impossible to understand due (in large part) to very high compression rates. Using a different app that allows you control over the quality of the audio helps, though the microphones on any phone are meant to pick up audio from much closer up than most other microphones. I really like Smart Voice Recorder, it's easy to use and has some great features. [https://play.google.com/store/apps/details?id=com.andrwq.recorder]

imapanther said:
I found my Moto G to have a similar problem with the stock app, recorded audio was almost impossible to understand due (in large part) to very high compression rates. Using a different app that allows you control over the quality of the audio helps, though the microphones on any phone are meant to pick up audio from much closer up than most other microphones. I really like Smart Voice Recorder, it's easy to use and has some great features. [https://play.google.com/store/apps/details?id=com.andrwq.recorder]
Click to expand...
Click to collapse
1) Moto g doesnt have a stock app for voice recording
2) I clearly mentioned that I had the problem with smart voice recorder. And you are suggesting me that same app.
3) I'm not sure which phone you are using and I dont think you even read my question

Stereo Audio Recording?

Can any of the early adopters here confirm whether the Pixel (not XL) is capable of recording stereo audio when capturing videos? All of the example videos I've seen on YouTube seem to be recorded with monaural audio.
This could be the only deal breaker for me. I take my HTC M8 to concerts frequently, and it captures phenomenal stereo audio that doesn't distort or clip in loud venues. As much as I like the Pixel, I would probably have to buy the HTC 10 instead if the audio recording capabilities were overlooked by Google.

bjamerican said:
Can any of the early adopters here confirm whether the Pixel (not XL) is capable of recording stereo audio when capturing videos? All of the example videos I've seen on YouTube seem to be recorded with monaural audio.
This could be the only deal breaker for me. I take my HTC M8 to concerts frequently, and it captures phenomenal stereo audio that doesn't distort or clip in loud venues. As much as I like the Pixel, I would probably have to buy the HTC 10 instead if the audio recording capabilities were overlooked by Google.
Click to expand...
Click to collapse
I just did some testing for you. The built in video recorder records in mono. However, the Pixel obviously has the ability to record in stereo because I just tried the "Sony Audio recorder" on Google Play and it records stereo audio. If you just need audio and not video this has the ability to record very high quality stereo recordings.

gadgetgaz said:
I just did some testing for you. The built in video recorder records in mono. However, the Pixel obviously has the ability to record in stereo because I just tried the "Sony Audio recorder" on Google Play and it records stereo audio. If you just need audio and not video this has the ability to record very high quality stereo recordings.
Click to expand...
Click to collapse
Wow thanks for looking into this!
I'm really disappointed to learn that the "best phone camera ever" doesn't record videos in stereo! Google really needs to address this in an app update quickly.
Good to know that the hardware is capable, at least. The Pixel also seems to do well in very high sound pressure levels too, based on concert clips I've seen posted on Youtube (this is something HTC has always excelled at).

bjamerican said:
Wow thanks for looking into this!
I'm really disappointed to learn that the "best phone camera ever" doesn't record videos in stereo! Google really needs to address this in an app update quickly.
Good to know that the hardware is capable, at least. The Pixel also seems to do well in very high sound pressure levels too, based on concert clips I've seen posted on Youtube (this is something HTC has always excelled at).
Click to expand...
Click to collapse
Okay.... It is not very meaningful as "stereo" it is not an XY or A-B studio recording physical pattern.
It is more useful for most people as a mono recording, less noise that is heavy left or right from handling phone to record a "home video" (of a meowing cat or cute baby etc)
That said I am an audio engineer and musician, and I can see a usefulness in having two sources, in case one is better. Mixing them might be better with some of each side panned to the other.
I just consider it two channel recording. Stereo is about perceiving a binaural field L+R, not just two paired signals. The analogy isn't moot. A single mic close to a sound source in a studio and one mic in a distant point that provides "room noise" or "reverb" is 2 channels, not a stereo.
So I think it better to know that there are many options and considerations to make when you do use an app to record with both mics as to how to mix the sources knowing they aren't intrinsically just stereo. That's why I prefer the built in camera app to just stick to mono which is overall better sound for most people. 2 channels only sound good if you do some "audio mixing" in a DAW....
Sent from my sailfish using XDA Labs

nednednerb said:
Okay.... It is not very meaningful as "stereo" it is not an XY or A-B studio recording physical pattern.
It is more useful for most people as a mono recording, less noise that is heavy left or right from handling phone to record a "home video" (of a meowing cat or cute baby etc)
That said I am an audio engineer and musician, and I can see a usefulness in having two sources, in case one is better. Mixing them might be better with some of each side panned to the other.
I just consider it two channel recording. Stereo is about perceiving a binaural field L+R, not just two paired signals. The analogy isn't moot. A single mic close to a sound source in a studio and one mic in a distant point that provides "room noise" or "reverb" is 2 channels, not a stereo.
So I think it better to know that there are many options and considerations to make when you do use an app to record with both mics as to how to mix the sources knowing they aren't intrinsically just stereo. That's why I prefer the built in camera app to just stick to mono which is overall better sound for most people. 2 channels only sound good if you do some "audio mixing" in a DAW....
Sent from my sailfish using XDA Labs
Click to expand...
Click to collapse
Great information and very useful

gadgetgaz said:
I just did some testing for you. The built in video recorder records in mono. However, the Pixel obviously has the ability to record in stereo because I just tried the "Sony Audio recorder" on Google Play and it records stereo audio. If you just need audio and not video this has the ability to record very high quality stereo recordings.
Click to expand...
Click to collapse
In your tests, did you compare the waveform of both channels to see if differences exist? How do you know the Sony app didn't just take the mono input and record it to both left and right channels?

Hi I didn't compare the waveforms I just listened to the audio. If you record a single sound source and rotate the phone while recording you can hear the sound going from one ear to the other on playback. If it was a mono recording you wouldn't be able to tell that the phone was being rotated at the time the recording was made.

So which mic is left, and which one is right?

Solutions Etcetera said:
In your tests, did you compare the waveform of both channels to see if differences exist? How do you know the Sony app didn't just take the mono input and record it to both left and right channels?
Click to expand...
Click to collapse
You can easily tell immediately if a video was recorded with 1 or 2 channels of audio, especially when wearing headphones. Here is a clip I recorded with my HTC M8... Notice how the sound pans when I turn the camera away from the stage!
https://youtu.be/-yqL9uD2oxY
2 channels is simply more lifelike... We have two ears, so the Pixel should be using two mics for the most realistic audio.

Device: Pixel (sailfish) running Android 7.1 Nougat
One of our users (we are developers of an audio recorder app on Google Play) is reporting that the top microphone on the Pixel has a slight hiss (when he records stereo audio).
Is this an exception (maybe just a bad device) ? Or are other Pixel users seeing this as a general behavior on Pixels ?
This is confirmed when he records mono audio as well, by using the top microphone (aka "Camcorder" microphone). In our app, the user can choose the "Audio Source for Mono" and set it to Camcorder for the top microphone. For stereo, the user can modify the "Audio Source for Stereo" to find a setting that works best. Even the best setting there had a hiss when recording audio. Hiss was less obvious in certain environments.
Hiss in the top microphone on Android phones can be due to interference from the antenna. One can test if this is the cause, by turning on the Airplane Mode (which shuts off the antenna). Usually the hiss will disappear.
However, in his case the top microphone persisted in having that slight hiss (even with Airplane Mode set to On).
Thanks.
EDIT:
To test this with our app, you can search "mp3 recorder" on Google Play - our app is the "Amazing MP3 Recorder Pro" app there.
EDIT 2:
I have heard back from one person who is suggesting the problem is NOT universal to Pixel - and may just be a problem with that user's device (thus warranting a RMA - Return Merchandise authorization i.e. a return candidate).

Microphone records only in mono?

Ok so I just got the Pixel 2 XL and realized that all audio recording on it is in mono. Even when I hooked up my blue yeti (set to stereo mode) the audio still got mixed down to mono. The reason why this is such a big deal to me is that recording just sounds awful compared to my Galaxy S5 that recorded in stereo.
Is this a hardware limitation on the Pixel 2 XLs side, or is it a software limitation? If it is software do I have hope that a custom rom in the future would be able to enable stereo recording?

There's one mic (unless you want different levels and quality on each channel) and one pin for mic input in the phone, so I'm guessing (it would be the way I'd have done it) they've only implemented one audio channel for the mic (hardware costs money). So even if you use a stereo mic, both channels are being fed to the same pin (or you're losing one channel, depending on the mic manufacturer and whether you have the mic set to stereo or mono), so the phone records in mono.
I haven't torn my phone apart - this is just a "how would I implement this if I were given the assignment" first approximation. (On second approximation, I'd probably split the mic input so a mono mic plug would hit both channels, but a stereo plug would maintain them separately, then run 2 channels in the phone, at least for video recording ... then present it to be shot down as being too expensive.) But I don't work for Google, so I have no idea what their design philosophy is.

There is definitely at least two mics, one bottom side that you speak into and one top side that is used for ambient noise reduction while you are on a call. This is the same setup that the original Pixel had except the ambient mic was on the rear, it too only recorded video with mono audio, but later on an audio system mod was made to enable stereo playback and capture; https://forum.xda-developers.com/pixel-xl/themes/mod-enabling-dual-speaker-audio-playback-t3492257 . Unfortunately an equivalent mod doesn't exist for our Pixel 2 yet, but hopefully someday it will.