Voice Tracker Array Microphones - Acoustic Magic

Voice Tracker™ Array Microphones Unidirectional microphones with an omnidirectional field of view

Acoustic Magic Voice Tracker II Array Microphone - Acoustic Magic Voice Tracker II Array Microphone - 210

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  • TAG : Ceiling Microphone Array - ClearOne
  • Let us consider the hypothetical case of a microphone arraycomposed of microphones, as seen in figure ,with identical frequency response and equal distance between anytwo adjacent microphones, of value d meters. If only thehorizontal directivity pattern is considered ()and have microphones with equal amplitude weights , the main lobe can be steered to the direction ' usinga basic delay-and-sum beamforming by applying the following phaseweights to the channels:

    Microphone arrays consist of multiple microphones functioning as a single directional input device: essentially, an acoustic antenna. Using sound propagation principles, the principal sound sources in an environment can be spatially located and distinguished from each other. Distinguishing sounds based on the spatial location of their source is achieved by filtering and combining the individual microphone signals. The location of the principal sounds sources may be determined dynamically by analysing peaks in the correlation function between different microphone channels.

  • Microphone arrays based on the minimum variance distortionless response (MVDR) beamformer are among the most popular for speech enhancement applications. The original MVDR is excessively sensitive to source location and microphone gains. Previous research has made MVDR practical by successfully increasing the robustness of MVDR to source location, and MVDR-based microphone arrays are already commercially available. Nevertheless, MVDR performance is still weak in cases where microphone gain variations are too large e.g., for circular arrays of directional microphones. In this paper we propose an improved MVDR beamformer which takes into account the effect of sensors (e.g. microphones) with arbitrary, potentially directional responses. Specifically, we form estimates of the relative magnitude responses of the sensors based on the data received at the array and include those in the original formulation of the MVDR beamforming problem. Experimental results on real-world audio data show an average 2.4 dB improvement over conventional MVDR beamforming, which does not account for the magnitude responses of the sensors.

    In Windows Vista and later, support is provided for microphone arrays. In most situations, a single microphone embedded in a laptop or monitor does not capture sound very well. An array of microphones performs better to isolate a sound source and reject ambient noise and reverberation. The property specifies the geometry of a microphone array. The property value, , describes the array type (linear, planar, and so on), the number of microphones in the array and other features.

  • As noted by , the headphones work by using an array of microphones built into the ear pads that listen to ambient sounds, similar to the way Amazon ’s Alexa listens out for vocal prompts. One of the inventors listed on the patent, Benjamin Scott, worked on the Alexa Information team for three years.

Microphone Array Beamforming - VOCAL

Later the bioacoustics department at the Cornell Lab of Ornithology created more units that were eventually used to inventory and monitor African forest elephant populations in Central Africa for the Elephant Listening Project. Other researchers at Cornell developed entire arrays of microphones arranged in grids that could simultaneously monitor many vocalizing birds at once. These arrays use computer algorithms to determine the location of a singing bird within the grid of microphones and so can provide information about how each bird reacts acoustically and spatially to nearby birds.