Mobile Speakerphone

How do the mobile phones in Speakerphone mode avoid feedback issues so well?
Most cheap fixed line speaker-phones and in general mic/speaker in close vicinity suffer from feedback issues, yet most cellular mobile phones manage to avoid it when operated in speakerphone mode at reasonably loud volume. Any special circuitry ? Advanced DSP ? Keen to know the details.
Not *that* hard, actually… It knows what sound it is sending out, so it can subtract that from any sound input.
—
Kasey C, PC guru since Apple II days
Laziness: resting BEFORE you are tired.
Mobile Fun: Advanced Bluetooth Speakerphone
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New-Bluetooth Speakerphone – ICARKIT305 i.Carkit 305 Bluetooth speakerphone is compact in size with great features for on the go. Features include Noise and echo cancellation software for clear voice transmission, multipoint connectivity which allows you to connect with 2 mobile phones. Great loud and clear speaker…. |
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New-In-Car Speakerphone – CRUISER Jabra Cruiser In-Car Speakerphone, a stylish and versatile new speakerphone can be used on its own or to transmit the calls to your car’s audio system with no installation necessary. What’s more, this compact device can also be used to stream music via A2DP stored on your mobile phone through your car stereo speakers, allowing you to enjoy your favorite track while driving. Plus, excellent audio q… |
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Logitech Mini Boombox for Smartphones, Tablets and Laptops – Black (984-000204) $79.99 You can also listen for up to 10 hours straight on the rechargeable, internal battery. The Logitech 984-000204 Mini Boombox also provides backlit, touch panel controls, handy speakerphone, and is perfect for travel…. |
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Satechi BT Wireless Bluetooth Portable Speaker System for MP3 Players, iPhone, Android Phones, and iPad $32.99 Satechi BT is a super-stylish Bluetooth stereo speaker that combines exceptional audio performance and a cutting edge portable design. With its Bluetooth version 2.0, it connects simply and seamlessly to your smartphone, tablet, notebook, or any other blu… |
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Jawbone JAMBOX (Red Dot) $199.99 The Jawbone JAMBOX REDDOT Bluetooth Speaker/Speakerphone delivers stunning hi-fi audio in a portable wireless speaker so compact you will not believe it when you hear it. With an output capacity of 85 decibels, JAMBOX fills even the largest rooms. JAMBOX is powered by a pair of proprietary, highly sophisticated acoustic drivers, unmatched in their ability to produce extreme high (tweeter) and low … |
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Jabra CRUISER2 Bluetooth In-Car Speakerphone $52.26 JABRA 100-47200000-02 CRUISER2 SPEAKERPHONECALLER ID ANNOUNCED CALLER’S NAME; SUPERIOR SOUND WITH DUAL MICROPHONE TECHNOLOGY ; SIMPLE SETUP WITH NO INSTALLATION NEEDED; MULTI USE… |
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Motorola Roadster 2 Universal Bluetooth In-Car Speakerphone – Retail Packaging – Silver $74.99 Stay in touch on the go with ROADSTER 2, the latest Bluetooth 1 enabled in-car speakerphone from Motorola. The speakerphone conveniently attaches to your visor making it perfectly placed to hear and be heard when making calls in the car. ROADSTER 2 also has best-in-class noise cancellation which means your voice can be heard over the loud traffic or road noise outside. Don’t worry about having t… |
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Jabra FREEWAY Bluetooth Speakerphone (Black, Retail Packaging) $85.00 Consider it the ultimate sidekick. The Jabra Freeway Bluetooth in-car speakerphone makes going hands-free a breeze. Featuring a 3 speaker stereo system and virtual surround sound, the thin speaker easily clips onto your car’s sun visor or overhead console. The voice-controlled speaker allows you to make and take calls completely hands-free. An added dual-microphone eliminates background noise, mak… |
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Motorola TalkAbout EM1000R 20-Mile 22-Channel FRS/GMRS Two-Way Radio (Pair) $49.99 The Motorola Talkabout EM1000R is the ideal emergency preparedness communication tool for outdoor enthusiasts and active families. With a range of up to 20 miles, an emergency alert feature and flashlight, the EM1000R radios provide a convenient total emergency preparedness communication device–perfect for active outdoor excursions or life�s every day adventures. Take a pair on your next tri… |
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Cobra MR F300BT Waterproof Marine Handset with Bluetooth Wireless Technology for Use with Bluetooth-Enabled Cell Phones $189.95 Cobra”s MR F300 BT is the loudest and clearest way to make and receive cell phone calls on your boat. Do you ever worry about getting your cell phone wet or missing a phone call. Do you have a difficult time making clear calls while underway or in windy conditions. Cobra”s MR F300 BT solves all of these problems…. |

