Unlock instant, AI-driven research and patent intelligence for your innovation.

Estimating a room impulse response for acoustic echo cancelling

A room impulse response and impulse response technology, applied in the direction of transducer acoustic response prevention, echo suppressor/canceller, sound-generating equipment, etc., can solve problems such as significant noise level

Active Publication Date: 2016-07-20
MICROSOFT TECH LICENSING LLC
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The user (i.e., the desired sound source) may be several meters away from the microphone, and the noise level may be significant

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Estimating a room impulse response for acoustic echo cancelling
  • Estimating a room impulse response for acoustic echo cancelling
  • Estimating a room impulse response for acoustic echo cancelling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The problem of acoustic echo cancellation in a reverberant environment with a microphone array and one or more loudspeakers is considered. Echo cancellation requires learning the impulse response from multiple speakers to each microphone in the microphone array. This has conventionally been done at each microphone individually for each speaker. However, the signals arriving at the array share a common structure, which can be exploited to provide impulse response estimates.

[0016] Embodiments presented herein target initial room transfer function (RTF) estimation based on calibration signals. The techniques described here can be extended to the more complex problem of adaptive AEC filters, however, most current setups of microphone arrays use a calibration signal to initialize the filter and adjust a subset of the filter coefficients later. Existing embodiments relate to, but are not limited to, the more relevant problem of initial RTF estimation. The sparsity of RT...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Various methods and systems for estimating a room impulse response between an audio source and an array of microphones are described. In one example, a method includes receiving audio signals at a microphone of an array of microphones. The audio signals correspond to each of the microphones in the array of microphones. The method also includes determining a room impulse response in a subspace that is compatible with a geometry of the array of microphones based on the received audio signals.

Description

Background technique [0001] Acoustic echo cancellation (AEC) is the problem of canceling, from the signal picked up by a microphone, the signal radiated by a loudspeaker placed adjacent to the microphone. AEC is already an important aspect of two-way communication including teleconferencing systems, speakerphones, etc. The standard problem scenario consists of a speaker and a microphone, and the traditional solution is to train an adaptive filter to remove indications of speaker feedback. Due to the importance of the problem, increasing the convergence rate, detecting the convergence state, and reducing the computational complexity are areas where research continues to advance. [0002] The second scenario has recently gained more importance, namely, voice control for home and car entertainment systems. These systems usually have multi-channel audio reproduction, for example stereo or 5.1 surround systems operating at fairly high reproduction levels. The user (ie, the desir...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00H04S7/00H04M3/00H04M9/08
CPCH04M3/002H04M9/082G10L2021/02082H04R3/02H04R1/406G10L21/0208G10K11/16H04R3/002H04R3/005H04S7/305H04R2227/007
Inventor D·弗洛伦西澳A·耶莱佩迪
Owner MICROSOFT TECH LICENSING LLC