hello raaju, how i wish that your email had been posted a couple of weeks ago!
i have just finished a field assignment that involved capturing natural and human sounds occuring in the environment. i used iphone 4s, with inbuilt microphone and without any external device. there were suggestions on using external microphones that seemed rather expensive even to hire, let alone purchase. now, the task is to 1. isolate individual sounds from the multiple sounds that co-occur 2. enhance the sounds and suppress noise e.g. human talk when the focus is on sound of waves 3. transfer the audio files to laptop and other equipments for production raaju, will you please provide detailed answers on what and how to do ! thanks, shashi On 10/31/15, raaju <bidh...@gmail.com> wrote: > > > It seems like smartphones will do anything. But do they make effective > sound recorders? That depends on what you are looking (listening) for and > what > > type of phone you have. Below I describe ways to record on your > smartphone, > with examples of products that might help. Most of this discussion is > about > > Android phones and iPhones. > > > > There are 4 basic ways to use your phone as a recorder: > > > > 1. The built-in microphone(s). > > 2. Using a microphone plugged in through the headset port. > > 3. Using a microphone plugged in through the charging port. > > 4. Via Bluetooth. > > > > The built-in microphone > > > > If you are looking to use your phone as a voice recorder, for recording > personal notes, meetings, or impromptu sounds around you, then all you need > is > > a recording app. I would highly recommend getting a third-party app, as > the > apps that come with the phone are pretty basic. Important things to look > > for in an app are the ability to: 1) adjust gain levels; 2) change sampling > rates; 3) display the recording levels on the screen, so you can make any > adjustments > > necessary; and, perhaps not as important, 4) save the files to multiple > formats (at least .wav and .mp3). Also very handy is the ability to email > the > > recording, or save it to cloud storage, such as Dropbox. Some of the most > highly recommended apps for Android include Easy Voice Recorder Pro, > RecForge > > Pro, Hi-Q mp3 Voice Recorder, Smart Voice Recorder, and Voice Pro. For iOS, > Audio Memos, Recorder Plus and Quick Record appear to be good apps. > > > > Microphones on various models of phones vary quite a bit. Newer phones > have two or three microphones, but differ quite a bit in their sound > recording > > abilities. Especially problematic seems to be recording loud sounds, such > as concerts, although even those capabilities are improving. > > > > External microphone through the headset port > > > > Most iPhones and smart phones these days come with a TRRS port for the > headphones. If your headphone jack has 3 lines (4 rings) on it, it’s a > TRRS, which > > means it can act as a microphone as well as headphones. Before you > attempt > to connect an external microphone via the headset port, make sure it is a > > TRRS port. > > > > A TRRS plug on the left, TRS on the right > > > > Note the 3 (white) lines in the plug for the ear buds from my Samsung > Galaxy > S3, compared with the 2 (black) lines in the plug for a lavalier > microphone. > > > The color is irrelevant, but the number of lines is not. > > > > Because of the differences in jacks, you cannot plug in any old microphone > with a 3.5mm plug and expect it to work. Luckily, several manufacturers > have > > developed microphones that plug right into the headphone jack. > > > > However, there are also differences in the TRRS jacks, in the location of > the ground and mic connections: > > > > Schematic of omtp and ctia plugs > > > > Differences in wiring between the OMTP (Sony, older Android) and CTIA > (Apple, newer Android) plugs. CTIA is also called AJH. Note that there is > only > > one mic input, so all input will be mono. Right and Left refer to > headphone > output. > > > > This difference is something you need to be aware of, and make sure that > any > microphone, headset, or adapter is compatible with your phone. > Unfortunately, > > there is no way to tell from the outside which is the proper jack for your > device. However, the CTIA (Apple) version is becoming the norm, so > Apple-compatible > > devices now work on many recent android phones. Be sure to check the > descriptions to make sure your device is compatible. For more information > on the > > wiring of various plugs, see > > here. > > > > Rode Smartlav Lavalier Microphone for iPhone and Smartphones > > MicW iShotgun > > Stony-Edge SIMPLE LAV- MOBILE Condenser Lavalier/Lapel Microphone for > iPhone > & Android Smartphones > > Professional Lapel Microphone with 39″ cable for iPhone, iPad, iPod Touch, > Smartphones and Comptuers > > Audio-Technica ATR3350IS Omni Lavalier Microphone for Smartphones > > > > I have not used any of these, but I would expect them to be substantially > better than the built-in microphone on the phone. You might want to review > my > > page on “ > > Choosing Microphones > > ” if you don’t know the difference between a lav and a shotgun. See “ > > Comparing recording on a smartphone to a dedicated recorder > > ” for a video on how the iRig Mic Cast works on Android and iPhones. > > > > If you already have a microphone with a 3.5mm jack or an XLR microphone > (with power supplied - the phone can’t supply 48v phantom power), you can > buy an > > adapter that allows you to plug it into the TRRS port. Make sure that the > adapter is compatible with your phone. My Samsung Galaxy S3 is now using > the > > Apple standard, so I need iPhone compatible adapters. > > > > StarTech.com Headset adapter for headsets with separate headphone / > microphone plugs - 3.5mm 4 position to 2x 3 position 3.5mm M/F > > Sescom iPhone/iPod/iPad 3.5mm TRRS to 3.5mm Mic Jack & 3.5mm Monitor Jack, > 1′ > > Professional iPhone, iPad2, iPod Touch XLR Cable for XLR Microphones to be > Plugged In to the iPhone with a 3.5mm Mini Jack for Connecting Microphone > to > > Headphones > > TASCAM iXZ Mic / Instrument input for iPhone, iPad or iPod Touch > > > > Note that this does not appear to work on all devices and microphones, > apparently there are some differences in impedance levels of the > microphones > that > > the phones can’t deal with. [GEEK NOTE: TRRS jacks typically supply > 1.5-2.5v, with 1.0-1.6KΩ impedance, which varies by phone model and > manufacturer.] > > Some adapters are for microphones with batteries, and others specify > microphones with no batteries. And Apple wiring is just a tiny bit > different than > > the other CTIA (AJH) wiring. Some of these connectors also allow > simultaneous monitoring if you plug ear buds or headphones into the other > jack. This > > is very helpful in making sure you are recording what you want, otherwise > you need to watch the visual input displays (if your app has them) or wait > to > > play back the sounds. Even if you get the proper adapter, the microphone > may not work properly with it. > > KV Connection > > carries a wide variety of connectors that appear to take different > impedances into account; read the descriptions carefully. My advice, if > you > want to > > use a mic through the headphone port, is to get a mic designed for that > use. > > > > You also need an app that will allow you to select the external microphone. > For iOS check out iRig Recorder, Recorder Plus, Rode Rec and Audio Tool. > > For Android, check out RecForge Pro, Tape Machine, Field Recorder, Smart > Voice Recorder, or Audio Evolution Mobile. These are not all free apps, > but > reviewers > > say that the paid versions of the apps are worth it. > > Appcrawlr > > has put together a nice list of Android apps that work with external > microphones, including several that allow video recording with an external > mic. > > > > I recently tested a couple of different mics on a Samsung Galaxy S3 and an > iPhone 5, and compared the results to a dedicated recorder. I describe the > > results > > here > > (well worth the read if you are contemplating adding a mic through the > TRRS > port). Also, one of my readers also tested a couple of different Android > > devices using a mic & mixer into the TRRS port, and posted a YouTube video > > here. > > > > Note that the power to these microphones is pretty low, so they are > probably > not capable of recording quiet or distant sounds without adding a lot of > microphone > > noise. The TRRS port allows only one microphone input, so the signal > will > be mono no matter what type of microphone is used. Some apps split the > signal > > into two mono signals, but it will not be true stereo. It is not possible > to get a stereo input through the TRRS port. They appear to function quite > > well in office and studio settings, but are probably not suitable for > nature > recording. A pre-amp, such as the Tascam iX2 would help, but is only for > > XLR mics. I would love to hear about any experiences using smartphones > with > external microphones. > > > > Some Sony phones and tablets, particularly the Xperia line, use a TRRRS > (note the extra “R”) port. This allows stereo recording (!), but is > completely > > proprietary - it only works with one microphone ( > > Sony Stereo Microphone STM10), > > and works best with the Sony Audio Recorder app (available from the Play > Store). Based on videos posted on YouTube (e.g., > > here), > > it appears to have a lot of noise cancellation built in, which makes it > good > for interviews and close recording, but bad for ambient recordings. > > > > Android phones can also be used for line-in recording through the TRRS > jack. > See this > > link > > for details. > > > > Recording through the charging ports > > > > There are fundamental differences between Apple and Android in how they > handle recording through the charging ports. Basically, iOS includes audio > support; > > Android does not. Google farmed audio support out to the device > manufacturers, resulting in much confusion about which devices are > compatible and which > > are not. For a discussion of the complexities, see this > > link > > . > > > > External microphone plugged into the micro-USB port for Android > > > > Some smartphones, including my Samsung Galaxy S3, come with a USB host, > which means the mini-USB port (charging port) is capable of sending power. > To > > check if your phone has a USB-host, either Google “USB host” and your > phone make and model, or check > > PhoneArena, > > and type in your phone make and model and check under “Connectivity.” If > it has a USB host, it will be listed there (it will actually list “USB > host”, > > not just “Micro USB”). There are also several apps in the play store that > can check if your phone has a USB host (search for USB OTG). If you phone > has > > a USB host, you can use a USB OTG adapter to plug in a USB mic (you must > have the correct adapter). Again, this is low power, but is quite suitable > for > > recording podcasts or narration overlays for video. > > > > Below are some examples of USB microphones that reportedly work well: > > > > Blue Microphones Snowball USB Microphone (Gloss Black) > > Blue Microphones Yeti USB Microphone - Silver > > Audio-Technica AT2020USB Cardioid Condenser USB Microphone > > Samson Go Mic Portable USB Condenser Microphone > > > > It is also possible to plug in a USB audio interface, which greatly > increases the options for adding multiple microphones, instruments, and > MIDI > devices. > > However, not all devices will support USB audio. According to the > developers of Audio Evolution: > > > > block quote > > “Some Android devices have USB host but lack certain kernel features that > are needed for USB audio. These are usually cheap ‘Chinese’ tablets, but > also > > the Samsung Note 1 and Galaxy S2 lack it. When your device has a Rockchip > cpu inside, chances are very high it will not work.” > > block quote end > > > > In addition, some USB microphones and audio interfaces need more power than > the phone can supply, and so may need a powered USB hub to function > properly. > > > > The Ultramic is a full-spectrum, ultrasonic USB mic that records from 0-200 > kHz or 250 kHz depending on the model. It works well with Android phones > with > > USB host capabilities, but is too noisy for general recording. For more > about using the Ultramic to record ultrasounds, see “ > > Options for recording ultrasounds > > .” > > > > It is possible to plug a microphone with a 3.5 mm jack into the USB port, > using something like an iMic 3.5 to USB adapter, or USB mixer with 3.5 mm > mic > > inputs. I have tried this with a couple of different lavaliers, one > powered, one not (mic to iMic to USB-OTG to phone). The signal was a > little > noisier > > than my dedicated recorder, but comparable to the TRRS port of the iPhone > and much better than the Samsung’s TRRS port. > > > > Samsung Media/ peripheral Micro USB to USB Adapter for Galaxy S3, Note II > smart phone and Note Tabs > > Griffin Technology iMic USB Audio Device > > iLuv (iCB758) USB Audio Adapter (USB to 3.5mm Headset-Mic Adapter) > Compatable with Apple and Windows PC’s > > > > WARNING: There have been reports of Samsung S3’s bricking after using USB > OTG cables, presumably the problem is with faulty cables causing a short in > > the system. I’ve just replaced my second S3 after it bricked following > plugging in the OTG cable. I currently don’t have advice on which cable > to use, > > but I’m looking into it. If you are interested in adding a USB mic to your > smart phone, do some research beforehand on USB OTG problems. The cable > that > > caused the problem for me was an eForCity micro USB OTG to USB 2.0 adapter. > I have since replaced it with the Samsung-branded adapter shown above, and > > haven’t had any problems yet. If you have had problems or successes using > a USB mic on your phone, please let us know! > > > > It is also possible to plug a professional mic into a smart phone, using > something like the iRig Pro or the Blue Icicle (these convert an XLR to USB > and > > provide phantom power). Some also include gain controls so you can control > the level of the recording. I have not tried these setups, but there is > information > > on the web about them. They primarily seem to be used for podcasts and > studio work. > > > > IK Multimedia iRig Pro instrument/microphone interface with MIDI for iOS > and > Mac > > Blue Microphones Icicle XLR to USB Mic Converter/Mic Preamp > > > > Note that for both adapters shown above, you are going from mic to usb > adapter to USB-OTG to phone. That creates several potentially weak links > in > the > > chain and more places for problems. > > > > Note: You cannot use a usb mic with the video recorder on the phone - it > defaults to the onboard mics. > > > > Software Issues for recording with USB on Android > > > > The USB host is a digital input, and thus has better potential for quality > input (including stereo) than the TRRS jack. However, the only Android > apps > > I’ve been able to find that will record through the USB port are USB Audio > Recorder (free), AudioFi ($5.99; demo available) and USB Audio Recorder Pro > > ($8.49; demo version available). In spite of the similar names, these are > different products from different companies. They are very simple > recorders. > > USB Audio Recorder and AudioFi simply record and saves the file with a > time/date file name. USB Audio Recorder Pro also has a level meter and it > allows > > you to set sampling rate and gain levels on some mics. It does not share > files directly, but they can be shared (i.e., shipped to Dropbox) by going > into > > the folders directly on the phone. Audio Evolution Mobile is a > full-featured recording app that will use USB Audio Recorder Pro to accept > USB microphones. > > But note the caveats above about compatibility issues with different > Android > devices. > > > > Using the charging port of iPhones > > > > Several manufacturers have developed microphones that plug into the power > port of iPhones and iPads. If you want to record in stereo, this set up > seems > > to be your best option. These microphones have helped turn iPads into > miniature sound studios. Because different Apple devices have different > configurations > > for their charging ports, make sure the mics are compatible with your > device, although adapters may be available. > > > > Apogee MiC 96k Professional Quality Microphone for iPad, iPhone, and Mac > > Rode iXY Recording Microphone for iPhone/iPad > > Blue Microphones Mikey Digital Recording Microphone for Apple iPhone and > iPad > > Zoom iQ5 Mid-Side Stereo Microphone for iOS > > Tascam iM2X X-Y Stereo Condenser Microphones for iOS Devices > > > > There are also converters available to allow 30-pin and lightning ports to > accept USB devices, including microphones, mixes, preamps, MIDI devices, > etc. > > A variety of apps are available for recording through the the power ports, > including GarageBand, iPhone PC recorder, StudioMini, Rode Rec and others. > > > > Recording via Bluetooth > > > > Because most iPhones and Android devices are equipped with Bluetooth, which > allows wireless connection between devices, they can receive signals from > Bluetooth > > microphones. For this, you need a microphone capable of transmitting a > Bluetooth signal and an app capable of receiving the signal. Most > applications > > of this technology have been focused on the video industry, with most > Bluetooth mics being lavaliers that allow wireless transmission of > dialogue. > > > > Examples of Bluetooth microphones that couple with iPhones and Android > devices: > > > > Nolan MIC Bluetooth Wireless Microphone, Wireless Voice and Talk, Long > Range, Clarity Sound for Podcasting, Distance Education, Voice Recording, > Camcorder, > > Panel Session > > Nolan LiveMIC Bluetooth Remote Microphone for Bluetooth Audio Receivers, > Speakers, iPhone, iPad, Android and Smartphones, MacBook Air, Laptop, Mac > and > > PC > > > > Apps that can receive the Bluetooth signals include Easy Voice Recorder for > Android and Recorder Plus HD for iPad. > > > > There appear to be a lot of problems with Bluetooth microphones connecting > with smart phones, in terms of microphone and signal quality. It may be a > little > > early for this technology yet. > > > > What about Windows phones? > > > > I don’t know anyone with a Windows phone, so I have been unable to do any > testing. From examining the specs of some popular HTC, Nokia, and Huawei > phones, > > they appear to use the CTIA standard for the TRRS port, but Nokias appear > to > have some conflicts with iPhone headsets, which may mean TRRS microphones > > may not work. None of the phones I checked had USB host capabilities, > meaning USB recording option won’t work. But all of the phones had > Bluetooth capabilities. > > So, sadly, it appears that if you have a Windows phone, you are limited to > recording using the onboard mics or via Bluetooth. This > > site > > discusses apps for recording on Windows phones. > > > > UPDATE (21 July 2014): According to reader Matt (see comments below), > several models of Windows phones have TRRS ports that are compatible with > iPhone-type > > microphones. He recommends the Rode Smart Lav. > > > > Tips for recording with your smart phone > > list of 8 items > > 1. Recording via USB is a better option than TRRS is your phone supports > it. > > 2. If you are connecting an external microphone, make sure the connectors > are compatible with your phone. > > 3. Watch your sound levels to make sure you are picking up enough sound, > but > not overwhelming the microphones. > > 4. Simultaneously monitoring the recording helps get the recording levels > within range. > > 5. Getting close to the subject picks up the sound you want and minimizes > background noise. > > 6. Avoid windy situations and/or protect the microphones. > > 7. Sound files can be large, depending upon your sampling rate, so make > sure > you have enough storage space. > > 8. If sound recording is going to be an important use of your phone, > consider an iPhone over an Android or Windows phone. > > list end > > > > Smartphone or Dedicated Recorder? > > > > Although smartphones are very convenient, for field recordists, they are > not > a replacement for a dedicated recorder. Dedicated recorders allow > adjustment > > of gain and the ability to apply filters, and have more powerful pre-amps. > They have more settings for recording, including setting the sampling and > bit > > rate. And for nature recording, where you may want to set up your recorder > and leave it record for a while - who wants to do that with their phone? > > > > But if you use your phone for shooting video or for recording > conversations, > an external mic will be a great improvement over the on-board mics. For > podcasting > > or recording quick conversations, a small microphone added to a smartphone > would be convenient and adequate. Some of the microphones made for use > with > > iPhones and via USB host are capable of recording in stereo; overall, iOS > seems way ahead of Android when it comes to sound recording. > > > > With the rapid gains in technology in smartphones, they may overtake > recording they way they have overtaken photography. Now if they could just > improve > > the quality of the sound in a phone call…. > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://accessindia.org.in/pipermail/mobile.accessindia_accessindia.org.in/attachments/20151031/bfdd8d17/attachment.html> > > > Search for previous postings at: > http://www.mail-archive.com/mobile.accessindia@accessindia.org.in > > > > _______________________________________________ > Mobile.accessindia mailing list > Mobile.accessindia@accessindia.org.in > http://accessindia.org.in/mailman/listinfo/mobile.accessindia_accessindia.org.in > > to post send mail to: mobile.accessindia@accessindia.org.in > > Disclaimer: > 1. Contents of the mails, factual, or otherwise, reflect the thinking of the > person sending the mail and AI in no way relates itself to its veracity; > > 2. AI cannot be held liable for any commission/omission based on the mails > sent through this mailing list.. > -- Shashi Search for previous postings at: http://www.mail-archive.com/mobile.accessindia@accessindia.org.in _______________________________________________ Mobile.accessindia mailing list Mobile.accessindia@accessindia.org.in http://accessindia.org.in/mailman/listinfo/mobile.accessindia_accessindia.org.in to post send mail to: mobile.accessindia@accessindia.org.in Disclaimer: 1. Contents of the mails, factual, or otherwise, reflect the thinking of the person sending the mail and AI in no way relates itself to its veracity; 2. AI cannot be held liable for any commission/omission based on the mails sent through this mailing list..
