An important goal of many multi-mic sound capture devices is to provide a directional signal to noise ratio improvement, while consuming as little power as possible. Acoustic Beamforming of signals in the audible hearing range
When designing a multi-microphone sound capture device for full-duplex communication and/or voice control products, it is important to understand how the microphone array geometry affects beamforming performance. The most common geometry beamforming designs are uniform
Circular Microphone Array Figure 1 shows a typical circular microphone array configuration. N microphones are positioned on the perimeter of a circle and one at the center. The radius of the circle is d. We
In many practical applications, a single microphone may not provide the necessary signal-to-noise(SNR) for human-to-human or human-to-machine communications. One example of such applications is in-car dialog systems for human-car interfacing. Multiple microphones or microphone arrays
The use of automated speech recognition (ASR) engines for mobile applications is on the rise. Though, in theory, increasing the number of microphones affords increase in signal to noise ratio (SNR), practical constraints such as
Microphone arrays are one of the most advanced tools for improving speech quality. Most microphones have an omni-directional directivity pattern, so all desired and undesired sounds sources are picked up by the microphone equally. A
Microphone array beamforming is increasingly being used for hearing aids to reduce some inherent problems of single microphone output being amplified for the users consumption. Typical problems that arise with the use of a single
An important application of microphone array beamforming is its use in monitoring a speech source in the far field. Typical examples include surveillance, crowded vicinities such as a sports stadium or restaurant, gaming rooms etc.
Endfire beamforming is used extensively in situations where there is a single known beam direction. Whiles most improvements in endfire beamforming is achieved by increasing the number of microphones in the linear array, some extra
Differential beamforming using three uniform linear array (ULA) microphones, and hence second order, has two different implementations. An alternate to the static approach with a fixed direction of arrival is the so-called adaptive differential microphone
VOCAL Technologies, Ltd.
520 Lee Entrance, Suite 202
Buffalo, NY 14228
Phone: +1 716-688-4675
Fax: +1 716-639-0713
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