Apple wants to improve sound capture in its mobile devices
TweetFollow Us on Twitter

Apple wants to improve sound capture in its mobile devices

An Apple patent (number 20100284525) has appeared at the US Patent & Trademark Office that shows that future Apple mobile devices may sport a microphone array for improved sound capture.

The patent is for the transfer of multiple microphone signals to an audio host device. The invention involves an audio communications host device has a communications network interface, digitizing circuitry, and a headphone jack. A demultiplexer has an input coupled to receive a signal from a pin of the headphone jack, and multiple outputs coupled to inputs of the digitizing circuitry, respectively. An uplink audio processor receives digitized microphone signals from multiple outputs of the digitizing circuitry, and in response delivers an uplink signal to the communications network interface. The uplink signal contains audio from one or more of the digitized microphone signals. Other embodiments are also described and claimed. The inventors are Wendell B. Sander and David John Tupman.

Here's Apple's background and summary of the invention: "Mobile smart phones are increasingly being used in situations that call for hands-free communication. As a result, mobile phone users are now using headsets with cables that can be plugged into a headphone jack of the mobile phone. Typical headset designs have a single microphone that is located as near the user's mouth as possible, when the headset is worn, e.g. at the tip of a microphone boom or attached to one of the cables that connect to an earphone of the headset.

"This positioning however is generally not as good as being very close the user's mouth, often causing a decrease in the signal to noise ratio (SNR) of the speech signal that has been captured or picked up by the microphone. Coupled with the fact that most users often have conversations using their mobile phones in noisy environments, the fidelity of the captured speech signal is often very poor.

"One way to improve the performance of sound capture by the headset during a two-way communications or phone call application is to capture the near end user's speech using multiple microphones. This arrangement is also referred to as a microphone array. The processing of microphone array signals improves the SNR of the resulting microphone signal, by spatially filtering the ambient sound field around the near end user. In other words, the array is "pointed" toward the signal of interest, by emphasizing contributions from the better placed microphones while deemphasizing those of the poorly placed microphones. Microphone array processing may also be used in conjunction with a noise cancellation algorithm to more effectively reduce the ambient noise that is captured by the microphones.

"Headsets with built-in microphone arrays may also perform better when being used for media playback applications, e.g. while the user is listening to a locally playing MP3 music file, or streaming video over the Internet. In that case, microphone array processing may enhance the noise cancellation algorithm to alleviate the impact of acoustic leakage of ambient noise into an earphone of the headset.

"Microphone array processing may be performed within the so-called host device, e.g. the mobile phone handset unit or the digital media player device, by taking advantage of available central processing unit (CPU) data processing power within the host device. To deliver the microphone signals from the headset to the host device, a multi-channel audio codec with a digital microphone interface may be used. The digital microphone interface permits the connection of digital microphones in the headset, to a codec chip within the host device, via a multi-pin cable interface where each pin carries either a single microphone data channel or a reference clock signal (the latter being used for timing purposes to ensure correct sampling of the microphone data signal received by the host device).

"An embodiment of the invention is a technique for transferring multiple, analog microphone signals over a single-wire interface to an audio host device, such as a smart phone, an MP3 player device, or a desktop or laptop personal computer. On the headset side, a microphone signal transfer circuit includes a multiplexer having multiple inputs to receive multiple, analog microphone signals, respectively. An output of the multiplexer is coupled to the input of a voltage to current converter. An output of the voltage current converter is in turn coupled to a single, microphone signal line that runs to the host side. Power supply current may be provided to the multiplexer and the voltage to current converter, by a voltage regulator that is running off the microphone signal line.

"In other words, the microphone signal line not only transfers the microphone signal data from the headset side, but also provides DC current from the host side, to supply power for running the microphone signal transfer circuit. The multiplexer rapidly switches its output from being connected with one of its inputs to another, in accordance with a sufficiently high reference frequency, e.g. at least 10 kHz. The output signal of the multiplexer thus contains the sampled multiple microphone signals. The output voltage signal is converted into a corresponding sequence of current variations on the microphone signal line.

"The current variations on the microphone signal line are then detected at the host side as voltage variations, using a demultiplexer whose input is connected to the microphone signal line and whose outputs deliver samples of the microphone signals, respectively. To do so, the demultiplexer may switch its input, from being connected with one of its outputs to another one of its outputs, in accordance with the same reference frequency that was used by the multiplexer in the headset side.

"The analog outputs of the demultiplexer are then digitized and fed to an audio processor. The latter may perform microphone array processing upon the digitized microphone signals. Depending on the application running in the host device, the audio processor may produce for example an uplink signal that is then fed to a communications network interface of the host device (e.g., a telephony application), or an audio signal that represents playback of a digital media file (e.g., a local MP3 player application or an Internet streaming video player).

"The above summary does not include an exhaustive list of all aspects of the present invention. It is contemplated that the invention includes all systems and methods that can be practiced from all suitable combinations of the various aspects summarized above, as well as those disclosed in the Detailed Description below and particularly pointed out in the claims filed with the application. Such combinations have particular advantages not specifically recited in the above summary."

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Apple Pro Video Formats 2.0.2 - Updates...
Apple Pro Video Formats brings updates to Apple's professional-level codes for Final Cut Pro X, Motion 5, and Compressor 4. Version 2.0.2: Includes support for the following professional video codecs... Read more
Apple Final Cut Pro X 10.2.2 - Professio...
Apple Final Cut Pro X is a professional video editing solution.Completely redesigned from the ground up, Final Cut Pro adds extraordinary speed, quality, and flexibility to every part of the post-... Read more
Apple Compressor 4.2.1 - Adds power and...
Compressor adds power and flexibility to Final Cut Pro X export. Customize output settings, work faster with distributed encoding, and tap into a comprehensive set of delivery features. Powerful... Read more
Apple Motion 5.2.2 - Create and customiz...
Apple Motion is designed for video editors, Motion 5 lets you customize Final Cut Pro titles, transitions, and effects. Or create your own dazzling animations in 2D or 3D space, with real-time... Read more
A Better Finder Rename 10.00b1 - File, p...
A Better Finder Rename is the most complete renaming solution available on the market today. That's why, since 1996, tens of thousands of hobbyists, professionals and businesses depend on A Better... Read more
CrossOver 14.1.6 - Run Windows apps on y...
CrossOver can get your Windows productivity applications and PC games up and running on your Mac quickly and easily. CrossOver runs the Windows software that you need on Mac at home, in the office,... Read more
Printopia 2.1.14 - Share Mac printers wi...
Run Printopia on your Mac to share its printers to any capable iPhone, iPad or iPod Touch. Printopia will also add virtual printers, allowing you to save print-outs to your Mac and send to apps.... Read more
Google Drive 1.24 - File backup and shar...
Google Drive is a place where you can create, share, collaborate, and keep all of your stuff. Whether you're working with a friend on a joint research project, planning a wedding with your fiancé, or... Read more
Chromium 45.0.2454.85 - Fast and stable...
Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all Internet users to experience the web. Version 45.0.2454.85: Note: Does not contain the "... Read more
OmniFocus 2.2.5 - GTD task manager with...
OmniFocus helps you manage your tasks the way that you want, freeing you to focus your attention on the things that matter to you most. Capturing tasks and ideas is always a keyboard shortcut away in... Read more

Zen Brush 2 (Entertainment)
Zen Brush 2 1.0 Device: iOS Universal Category: Entertainment Price: $2.99, Version: 1.0 (iTunes) Description: Zen Brush 2 is a drawing app focused on the strong yet beautiful feel of the East Asian ink brush. | Read more »
NetNewsWire (News)
NetNewsWire 4.0.0 Device: iOS iPhone Category: News Price: $3.99, Version: 4.0.0 (iTunes) Description: Follow the Web NetNewsWire 4, completely written from the ground up for iPhone. NetNewsWire is the best way to keep up with the... | Read more »
Huzzah! Farming Simulator 16 Supports Cl...
As though it weren't difficult enough to resist the siren call of Farming Simulator 16, now it's been updated with cloud saves - so you can jump between devices without missing any of that precious crop-harvesting time. [Read more] | Read more »
Don't Starve: Pocket Edition Finall...
I've made no effort to hide my enjoyment of Don't Starve: Pocket Edition, but I will admit I was a tiny bit disappointed that it was only available for the iPad. Well nuts to that, because Klei Entertainment has made it universal! [Read more] | Read more »
Goat Simulator Wasn't Enough? Then...
If you just didn't get enough goat in Goat Simulator - or if you've been wanting to play a simulated MMO as a microwave - then you're in luck! Goat Simulator MMO Simulator is out now, and it's a game about simulated goats in simulated MMOs. Plus... | Read more »
You Can Play Madfinger Games' Unkil...
Madfinger Games - probably best known for the Dead Trigger series - has officially launched their newest zombie shooter (that isn't called Dead Trigger), named Unkilled. [Read more] | Read more »
KORG iELECTRIBE for iPhone (Music)
KORG iELECTRIBE for iPhone 1.0.1 Device: iOS iPhone Category: Music Price: $9.99, Version: 1.0.1 (iTunes) Description: ** 50% OFF Special Launch Sale - For a Limited Time **The ELECTRIBE reborn in an even smaller form A full-fledged... | Read more »
Toca Life: City Just Got a Bunch of New...
Toca Life: City is Toca Boca's most popular app (number 1 in 47 different countries, apparently), and it's just had an update that adds a bunch of new content. [Read more] | Read more »
My Country 3D is More About Cities than...
My Country 3D is an upcoming city builder from Game Insight that looks pretty decent - although the name seems a tad out of whack for a city builder. Ah well, it is what it is. [Read more] | Read more »
I am Bread (Games)
I am Bread 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: ‘I am Bread’ is the latest quirky adventure from the creators of 'Surgeon Simulator', Bossa Studios. This isn't the best thing... | Read more »

Price Scanner via MacPrices.net

Near-Office Input Functionality Virtually Any...
Today Logitech introduced the Logitech K380 Multi-Device Bluetooth Keyboard and the Logitech M535 Bluetooth Mouse, giving users the freedom to work on any device, most anywhere. According to... Read more
College Student Deals: Additional $100 off Ma...
Take an additional $100 off all MacBooks and iMacs at Best Buy Online with their College Students Deals Savings, valid through September 4, 2015. Anyone with a valid .EDU email address can take... Read more
2.8GHz Mac mini available for $988, includes...
Adorama has the 2.8GHz Mac mini available for $988, $11 off MSRP, including a free copy of Apple’s 3-Year AppleCare Protection Plan. Shipping is free, and Adorama charges sales tax in NY & NJ... Read more
Will You Buy An iPad Pro? – The ‘Book Mystiqu...
It looks like we may not have to wait much longer to see what finally materializes as a new, larger-panel iPad (Pro/Plus?) Usually reliable Apple product prognosticator KGI Securities analyst Ming-... Read more
eFileCabinet Announces SMB Document Managemen...
Electronic document management (EDM) eFileCabinet, Inc., a hosted solutions provider for small to medium businesses, has announced that its SecureDrawer and eFileCabinet Online services will be... Read more
WaterField Designs Unveils American-Made, All...
San Francisco’s WaterField Designs today unveiled their all-leather Cozmo 2.0 — an elegant attach laptop bag with carefully-designed features to suit any business environment. The Cozmo 2.0 is... Read more
Apple’s 2015 Back to School promotion: Free B...
Purchase a new Mac or iPad at The Apple Store for Education and take up to $300 off MSRP. All teachers, students, and staff of any educational institution qualify for the discount. Shipping is free,... Read more
128GB MacBook Airs on sale for $100 off MSRP,...
B&H Photo has 11″ & 13″ MacBook Airs with 128GB SSDs on sale for $100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 11″ 1.6GHz/128GB MacBook Air: $799.99, $100 off MSRP... Read more
13-inch 2.5GHz MacBook Pro (refurbished) avai...
The Apple Store has Apple Certified Refurbished 13″ 2.5GHz MacBook Pros available for $829, or $270 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.... Read more
27-inch 3.2GHz iMac on sale for $1679, save $...
B&H Photo has the 27″ 3.2GHz iMac on sale for $1679.99 including free shipping plus NY sales tax only. Their price is $120 off MSRP. Read more

Jobs Board

*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Content Partner Engineer - *Apple* TV - App...
**Job Summary** The Apple TV team is looking for an experienced engineer with a passion for delivering first in class home entertainment solutions. The candidate will Read more
*Apple* Desktop Analyst - KDS Staffing (Unit...
…field and consistent professional recruiting achievement. Job Description: Title: Apple Desktop AnalystPosition Type: Full-time PermanentLocation: White Plains, NYHot Read more
*Apple* Retail - Multiple Customer Support P...
Job Description: Customer Support Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the Read more
*Apple* Desktop Analyst - KDS Staffing (Unit...
…field and consistent professional recruiting achievement. Job Description: Title: Apple Desktop AnalystPosition Type: Full-time PermanentLocation: White Plains, NYHot Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.