With the advent of a standard wireless interface in cellular phones (Bluetooth), the hands-free function in automotive telematics is set for explosive growth over the next several years. Road safety continues to be a major concern for everyone, including government agencies, car manufacturers, and drivers themselves. Anything that draws attention away from driving will make the roads hazardous, whether it is reading the newspaper, eating a sandwich, or talking on the phone.

As such, hands-free cell-phone functions, which allow drivers to keep both hands on the wheel and eyes on the road, are becoming an essential feature in today’s automobiles. Worldwide, about 25 countries have passed laws restricting drivers from using hand-held cell phones, including Australia, Italy, Israel and Japan to name a few. 3 US states have enacted similar laws (e.g., New York), and at least 40 other states are now proposing such legislation, according to the National Conference of State Legislatures.

While hands-free functions are becoming a necessity, the traditional single-microphone voice-interface of the hands-free kits leaves much to be desired. As described in the SAM Benefits section, array microphones do a better job of identifying the sound source and suppressing ambient noise compared to a single microphone. However, due to its drawbacks in back-leakage and limitations in performing only horizontal noise suppression, noise such as that from the engine, from the air-conditioner, and from the road can create an unpleasant experience for the user.

With SAM (small array microphone), a cone shaped beam is formed. With no back leakage and an effective 3-D cone-shaped beam, SAM can cancel out all ambient noise, accurately identifying the sound source and clearly delivering that signal to the other party. While enabling both ends to enjoy a noise and echo free conversation, SAM will also enhance the full-duplex capabilities of the hands-free communication system. At the same time, users of voice-recognition or voice-controlled applications, such as On-Star, will benefit with a higher recognition rate and true “barge-in” capability.

Related pages:

1. SAM Benefits
2. SAM vs. Broadside Array Microphone
3. SAM in PC/VoIP Applications
4. SAM in Handheld Applications