| Popis: |
Microphones placed on the seat belts of an automobile (in the following called beltmics for short) are an interesting alternative compared to other sensor positions. Because of the small distance to the speaker’s mouth, usually a good signal quality (e. g., measured in terms of high signal-to-noise ratio) can be achieved. However, the signalsmay also be disturbed because beltmics can easily be touched by, e. g., clothes and they might be in the airstream of automotive ventilation systems. In addition, applying array processing techniques is difficult because the geometry is flexible and may change over time. This chapter presents signal enhancement algorithms designed for beltmics including echo cancellation, estimation of instationary noise, and microphone combining techniques. Results based on a real-time implementation are shown finally that demonstrate the performance of this new microphone type. |
