Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Near-field vector signal enhancement

A near-field, input signal technology, applied in the direction of microphone signal combination, sensor components, sensors, etc., can solve the problems of limited ratio of noise attenuation to distance, serious wind noise sensitivity and electronic noise, etc., to achieve noise reduction and good noise Effect of elimination, effect of low computational energy

Inactive Publication Date: 2009-12-02
DOLBY LAB LICENSING CORP
View PDF12 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These approaches introduce additional problems: near-field effects, severe wind noise sensitivity and electronic noise, frequency response coloration of far-field (noise) signals, the need for equalization filters, and if dual microphones are used electronically implemented, also requires the microphone to match the
Furthermore, among the many drawbacks, the ratio of noise attenuation to distance is limited and the residual noise in the output signal is strongly colored by

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
  • Near-field vector signal enhancement
  • Near-field vector signal enhancement
  • Near-field vector signal enhancement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] Embodiments of the invention are described herein in the context of a near field pickup system. Those skilled in the art will appreciate that the following detailed description of the invention is illustrative only and not limiting in any way. Other embodiments of the invention will be readily apparent to those skilled in the art having the advantage of the invention. Reference will now be made in detail to implementations of the invention as illustrated in the accompanying drawings. The same reference numbers will be used throughout the drawings and in the following detailed description to refer to the same or like parts.

[0040] In the interest of clarity, not all of the routine features of implementations are shown and described herein. Of course, it should also be recognized that during the development of any such actual implementation, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as accommodating th...

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

Near-field sensing of wave signals, for example for application in headsets and earsets, is accomplished by placing two or more spaced-apart microphones along a line generally between the headset and the user's mouth. The signals produced at the output of the microphones will disagree in amplitude and time delay for the desired signal-the wearer's voice-but will disagree in a different manner forthe ambient noises. Utilization of this difference enables recognizing, and subsequently ignoring, the noise portion of the signals and passing a clean voice signal. A first approach involves a complex vector difference equation applied in the frequency domain that creates a noise-reduced result. A second approach creates an attenuation value that is proportional to the complex vector difference,and applies this attenuation value to the original signal in order to effect a reduction of the noise. The two approaches can be applied separately or combined.

Description

technical field [0001] The present invention relates to near field sensing systems. Background technique [0002] When communicating in noisy environmental conditions, the speech signal may be contaminated by simultaneously picking up ambient noise. Single-channel noise reduction methods are able to provide a measure of noise cancellation to separate and reduce noise by using prior knowledge about the difference between speech-like signals and noise signals. However, single-channel methods cannot be used when the "noise" includes other speech or speech-like signals. Furthermore, as the amount of noise removal increases, some speech signals are also removed, thereby changing the purity of the remaining speech signals—that is, the speech becomes distorted. Additionally, the residual noise in the output signal becomes more speech-like. These deficiencies reduce recognition accuracy when used with speech recognition software. [0003] Array techniques attempt to use spatial ...

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): G06F3/16
CPCH04R2201/403H04R25/405H04R1/1091H04R25/407H04R3/005H04R2410/07H04R2410/05
Inventor J·C·滕策
Owner DOLBY LAB LICENSING CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products