Systems and methods for blind echo cancellation

a blind echo cancellation and echo cancellation technology, applied in the field of terahertz spectroscopy and imaging systems, can solve the problems of impracticality or inaccurateness of taking a measured reference signal, and achieve the effect of higher frequency resolution of the signal to be analyzed

Inactive Publication Date: 2011-04-07
VERISANTE TECH
View PDF19 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The present invention provides systems and methods of removing the adverse effect of reflections in a received terahertz signal without using a measured reference signal. The removal of the echo effect from the reflections without the use of a measured reference signal may be referred to as blind echo cancellation. The use of blind echo cancellations methods may be applied in applicat

Problems solved by technology

The use of blind echo cancellations methods may be applied in applications wher

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
  • Systems and methods for blind echo cancellation
  • Systems and methods for blind echo cancellation
  • Systems and methods for blind echo cancellation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025]Referring to FIG. 1, illustrated therein is a terahertz radiation transmission and detection system 100 made in accordance with an exemplary embodiment of the invention. The terahertz radiation system 100 may be used for either spectroscopy or imaging. The system 100 comprises a laser source 110 that is capable of generating optical pulses of femtosecond duration. The laser pulse excites the terahertz transmitter 120 to generate terahertz radiation 125 that may be directed at a sample 140 that is being analyzed. The sample 140 could be a gas, liquid or solid. The transmitted and reflected terahertz radiation 145 may then be received by the terahertz detector 130. The terahertz radiation at the detector 130 may then be measured as an electric current by a signal processor 160.

[0026]The laser source 110 is also used to excite the detector for the duration of the femtosecond pulse. An optical delay 150 may be used to create a relative delay between the pulse exciting the transmit...

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

System and method for blind echo cancellation in a received terahertz signal in a pulsed terahertz system for imaging or spectroscopy. Blind signal processing methods estimate the impulse response of the reflection mechanism and do not require a reference measurement to be taken. The reference signal may be recovered using a successive approach wherein the reference is first estimated using cross-correlation with the received signal and the received signal is represented as a function of the reference signal. For each successive echo, the calculated echo may be subtracted from the received signal and then the estimate of the reference signal is refined. Using an analytical approach, the parameters of a transfer function modeling the reflection mechanism may be estimated by optimizing a cost function.

Description

FIELD[0001]The present invention relates to terahertz spectroscopy and imaging systems, and in particular, to systems and methods for processing terahertz signals to reduce the effect of echoes.BACKGROUND[0002]Terahertz radiation is electromagnetic waves that have a frequency between 100 GHz and 30 THz, lying between the infrared and microwave parts of the spectrum. The radiation is non-ionizing and can penetrate most non-metallic objects but is absorbed by polar materials and liquids. Consequently, terahertz technology provides a number of spectroscopy and imaging applications, and is a fast-growing field.[0003]Terahertz pulses are distorted by passing though various materials including gases, liquids, and solids. It is well known that different materials alter the terahertz waves differently, depending on the material and the frequency content of the signal. It is the purpose of terahertz signal processing to detect and classify these changes. Depending on the application, some of...

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
IPC IPC(8): G01J5/02
CPCG01J3/28G01N21/3581G01J3/42
Inventor HEIDARI, ABDORREZA
Owner VERISANTE TECH
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
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap