Apparatus and method for spatially selective sound acquisition by acoustic triangulation

摘要

An apparatus for capturing audio information from a target location includes first and second beamformers arranged in a recording environment and having first and second recording characteristics, respectively, and a signal generator. The first and second beamformers are configured for recording first and second beamformer audio signals, respectively, when they are directed towards the target location with respect to the first and second recording characteristics. The first and second beamformers are arranged such that first and second virtual straight lines, defined to pass through the first and second beamformers, respectively, and the target location, are not mutually parallel. The signal generator is configured to generate an audio output signal based on the first and second beamformer audio signals so that the audio output signal reflects relatively more audio information from the target location compared to the audio information from the target location in the first and second beamformer audio signals.

主权项

1. An apparatus for capturing audio information from a target location, comprising:
a first beamformer being arranged in a recording environment and comprising a first recording characteristic, a second beamformer being arranged in the recording environment and comprising a second recording characteristic, and a signal generator, wherein the first beamformer is configured for recording a first beamformer audio signal when the first beamformer is directed towards the target location with respect to the first recording characteristic, and wherein the second beamformer is configured for recording a second beamformer audio signal when the second beamformer is directed towards the target location with respect to the second recording characteristic, wherein the first beamformer and the second beamformer are arranged such that a first virtual straight line, being defined to pass through the first beamformer and the target location, and a second virtual straight line, being defined to pass through the second beamformer and the target location, are not parallel with respect to each other, and wherein the signal generator is configured to generate an audio output signal based on the first beamformer audio signal and on the second beamformer audio signal, so that the audio output signal comprises relatively more audio information from the target location compared to the audio information from the target location in the first and the second beamformer audio signal, wherein the signal generator comprises an intersection calculator for generating the audio output signal in the spectral domain based on the first and second beamformer audio signal, and wherein the intersection calculator is configured to compute the audio output signal in the spectral domain by calculating a cross-spectral density of the first and the second beamformer audio signal, and by calculating a power spectral density of the first or the second beamformer audio signal.