Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Echo canceller

An echo cancellation and pseudo-echo technology, which can be used in branch office voice amplifiers, transducer acoustic response prevention, telephone communication, etc., and can solve problems such as discomfort.

Inactive Publication Date: 2010-06-30
YAMAHA CORP
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Well, when the level of echo is high, there is the problem of causing an uncomfortable feeling

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
  • Echo canceller
  • Echo canceller
  • Echo canceller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0051] An echo canceller 1 as one embodiment of the present invention will be described below with reference to the drawings. The echo canceller 1 is formed by driving a microcomputer installed in the conference system.

[0052] figure 1 is a schematic diagram showing the overall configuration of the echo canceller 1 . figure 2 is included in figure 1 A schematic diagram of the structure of the fixed-point DSP section 20.

[0053] exist figure 1 Among them, an echo canceller 1 includes a floating-point DSP section 10, a gain control section 11, a fixed-point DSP section 20, and a monitoring section 30, and cancels echoes from sound collection signals. Furthermore, in the echo canceller 1 according to the present embodiment, an example of the monitoring section 30 arranged in the floating-point DSP section 10 has been given and described. However, the present invention is not limited to this example. For example, the monitoring section 30 may be arranged at another locat...

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

It is an object to provide an echo canceller that can be configured to more effectively suppress an echo, with the suppression of increase in costs, than a case of filter processing carried out by a signal in the fixed point form. An echo canceller (1) is provided with a floating point DSP unit (10) and a fixed point DSP unit (20). The floating point DSP unit (10) is comprised of an FIR filter processing unit (12), an adder (14) and a first converting unit (16). The FIR filter processing unit (12) generates a pseudo echo signal in the floating point form and the adder (14) subtracts the pseudo echo signal from a collected sound signal to generate a first correction signal. The first converting unit (16) converts the first correction signal into the one in the fixed point form for the adjustment of a gain. The fixed point DSP unit (20) is comprised of a FIR filter processing unit (21) and an adder (22). The FIR filter processing unit (21) generates a pseudo echo signal in the fixed point form, and the adder (22) subtracts the pseudo echo signal from the first correction signal converted into the fixed point form to generate an output signal.

Description

technical field [0001] The present invention relates to an echo canceller for canceling echoes from collected sound. Background technique [0002] Generally, in a telephone, a karaoke machine, and the like using a microphone and a speaker, part of the sound emitted from the speaker is picked up in the microphone as a feedback sound collection signal. The emitted sound may become an echo and come from the speaker on the opposite side. Then, when the level of echo is high, there is a problem of causing an uncomfortable feeling. [0003] Therefore, an echo canceller has been proposed so far as a countermeasure for suppressing the above-mentioned echo. [0004] One of these echo cancellers reduces the echo even when the echo is large by amplifying a speaker signal and then sending the signal to the echo canceller (refer to Patent Reference 1). [0005] Moreover, there is also an echo canceller in which the S / N ratio with respect to background noise is improved by amplifying a...

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): H04B3/23H04M1/60H04R3/02
CPCH04M9/082H04B3/237
Inventor 田中良
Owner YAMAHA CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com