Android

Capturing The Video Output Of A Nexus 7 Tablet

DoorBot-in-Nexus5There are times when it would be handy to capture the video output of an Android device. This is typically what I need when writing something about an app that does something dynamic. For example, AudioTool by J.J. Bunn. As a tool for simple audio test & measurement capturing its output in real-time is the ideal way to communicate the measurement being taken. A static screen shot is fast & easy to accomplish, but video can be much more illuminating.

Both my Nexus 4 and Nexus 7 (2013) support the use of a Slimport USB-to-HDMI adapter to connect to a monitor. The output of that adapter is 1080p60. The BlackMagic Design Intensity Pro HDMI capture card that I’ve used for the past couple of years can capture streams up to 1080i60, but not 1080p60.

Quite recently I swapped out the Intensity Pro for an AVerMedia Game Broadcaster HD. This card has the ability to capture a 1080p60 stream. In so doing it drops every second frame to actually save a 1080p30 stream to disk.

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Mobile HDVoice; A Post In Three Acts

Act 1: The Future – Sprint To Offer HDVoice Nationwide in July

iPhone-SprintSprint,  the nation’s number #3 mobile carrier, has announced nationwide rollout of HDVoice in early July. At present they have just a few test markets HDVoice enabled. While some met the announcement with enthusiasm, HDVoice observer Doug Mohney has taken a justifiable wait-and-see approach to this news as Sprint has made such promises more than once in recent years.

Ever curious, I thought it worth looking into what kind of HD Voice-capable devices they would be offering. The list of twenty handsets seems quite comprehensive. That bodes well for customers someday actually getting to experience HDVoice.

Just as significantly, the HD Voice capable handsets was easy to identify. The company lists “HD Voice” as a key feature that can be used to search through the entirety of their handset offering. Thus new customers can easily reference this feature while in the process of selecting their new handset.

That brings me to…

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Binaural Fun With AmbiExplorer For Android

AmbiExplorer_framedMy issue with use of the term 3D with reference to binaural voice conferencing service stems from the fact that I’ve been having some fun with real 3D audio over the past couple of months. This has come about since Hector Centeno released AmbiExplorer for Android, an application that lets us decode Ambisonic recordings for binaural playback in headphones.

AmbiExplorer plays back first-order B format files as well as UHJ encoded stereo files. As opposed to simply left, center, right, etc. a B format file is actually comprised of four channels known as W, X, Y & Z. These correspond to three directional signals and an omnidirectional reference signal.

By performing some matrix math on these signal in a coordinated fashion the entirety of the soundstage can be transformed in 3D space. AmbiExplorer decodes the four signals into a binaural feed, allowing the user to rotate their listening perspective in real-time. You can think of it as a 3-axis “balance” control.

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Shields Up! New Protection For Our Androids

True to his offer last month, Ed Tyson of Expert Shield sent us a sample set of his companies protective garb for mobile devices. Last week we received a package with kits for each of our Nexus 4 cell phones and my Nexus 7 tablet. My devices are now cloaked in these new wares, but I have to to take Stella’s Nexus 4 captive for long enough to dress it in a similar fashion.

Applying any screen protector requires a certain amount of skill and care. There’s not much opportunity to lift and reposition the clear and somewhat wobbly layer once it’s been applied. One must take care that it’s not applied in a skewed manner.

In some regards application of the screen protector is easier on the larger tablet than the cell phone. First, the tablet is larger, making it easier to align the item to the face of the device. Secondly, the tablets doesn’t have as many little openings and sensors that must align with irregularities in the perimeter of the screen protector.

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New Protection For Our Androids

nexus-7-nexus-4Not long ago Ed Tyson of Expert Shield contacted me with an offer of his companies screen protection for our Android devices. As our various phones (Nexus 4) & tablets (Nexus 7) are presently naked(!) I decided to take him up on his offer. We’re just awaiting arrival of the goods.

In the past I have used Skinomi Techskin and found them quite good. I once again reached for their products when I shattered the glass back on my Nexus 4 some weeks ago. The carbon wrap is still working great to hold the broken back together.

That said, I found that the clear protective layer for the front of the phone was a bit on the thick side. While it worked well enough as protection I found that it felt a little gummy to the touch. It subtly changed the feel of the phone in use, something that I’d like to avoid if possible.

Stella and I were initially using the Poetic Borderline Bumper case for Google Nexus 4 but we both stopped using them in recent weeks. Stella found that it made the power and volume buttons awkward to access. Mine simply tore near the power connection, then started to come apart.

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