Just Dial And Drive

April 12, 2006
A Bluetooth hands-free car telephony kit can be built right into a vehicle’s rear-view mirror. Once installed, simply dial and speak.

A Bluetooth hands-free car telephony kit designed by Korean company Sungjin Techwin plans to incorporate BlueCore3-Multimedia (BC3-MM) technology. Developed by U.K.-based CSR plc, BC3-MM will ensure the kit connects to any Bluetooth-enabled mobile phone thanks to interoperability pre-testing.

The Bluetooth-enabled phones are controlled by a digital rear-view mirror. The rear-view mirror control unit, which is powered from the cigarette-lighter socket, features a 12-digit caller ID display with single push button control of all call features and loudspeaker settings. The incoming phone number is announced through the unit’s integral speaker and amplifier.

CSR’s Kalimba DSP suppresses in-car noise and echo using CSR’s Clear Voice Capture (CVC) technology. The acquisition of Clarity Technologies by CSR brought CVC technology to CSR’s Bluetooth portfolio. CVC’s noise-suppression algorithm separates the user’s voice from unwanted noise within the environment. The echo-suppression system similarly removes all unwanted echoes, allowing designers to position microphones and speakers closely together. In addition, CVC technology enhances voice-quality during calls.

BC3-MM’s built-in Kalimba DSP doesn’t require further external processors for audio processing, thus saving money on the overall bill of materials. The DSP also is more efficient in audio processing, achieving power-consumption levels similar to that of Bluetooth headsets without integrated echo and noise suppression.

Two different kits—the MHF-R220BT and MHF-R330BT—are available. The difference is that the MHF-R330BT incorporates parking sensors.

Dongle design

In another development, CSR crafted what’s claimed as the first Bluetooth VoIP dongle design for Skype calls. The Voice Dongle 1 package features all of the elements to produce a low-cost, plug-and-play USB dongle that can make Skype VoIP calls over a Bluetooth mono headset.

As a result, CSR customers can create a product that pairs automatically with the user’s Bluetooth headset, integrates seamlessly with the computer’s Skype software, and requires no separate installation software.

Once plugged into the USB port, the dongle allows the user to accept or reject calls, adjust the volume up or down, and mute calls using the mono headset.

Karen Parnell, product marketing manager at CSR, says, "The CSR Voice Dongle 1 solution enables designers to produce a VoIP Dongle quickly and easily by providing all of the elements needed for the development. This includes a software development environment, fully interoperability-tested application code, hardware reference design and design documentation. This will dramatically reduce the time to market for VoIP Bluetooth Dongles."

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