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

Virtualizer with cross-talk cancellation and reverb

a virtualizer and cross-talk technology, applied in the field of digital audio signal processing, can solve problems such as limiting the available dynamic range, and achieve the effect of simplifying the contra-lateral respons

Inactive Publication Date: 2011-02-03
TEXAS INSTR INC
View PDF7 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a way to virtualize speakers in a way that reduces interference between different frequency bands. This can be useful for creating high-quality headphones or speakers. Additionally, the invention includes filters to cancel out cross-talk and create a more immersive listening experience. The invention also includes a way to create a virtual speaker by using psychoacoustic reflection and separating filters based on early arrivals and late reverberation. Overall, the invention improves the quality and clarity of virtual speakers.

Problems solved by technology

However, a practical problem arises in the actual implementation due to approximate nulls in the transfer functions M0(ejω)=H1(ejω)+H2(ejω) and S0(ejω)=H1(ejω)−H2(ejω).
This large peak in turn limits the available dynamic range.

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
  • Virtualizer with cross-talk cancellation and reverb
  • Virtualizer with cross-talk cancellation and reverb
  • Virtualizer with cross-talk cancellation and reverb

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

1. Overview

[0019]Preferred embodiment virtualizers and virtualization methods for multi-channel audio include filtering adapted to switching between loudspeakers and headphones, simplified reverberation by a common long-delay portion for all channels, cross-talk cancellation shuffler implementation with simplified inverse sum, Bark band based virtual locations for 2-channel input, and divided out peak frequencies for cross-talk cancellation simplification.

[0020]Preferred embodiment systems (e.g., home stereo sound systems, computer sound systems, et cetera) perform preferred embodiment methods with any of several types of hardware: digital signal processors (DSPs), general purpose programmable processors, application specific circuits, or systems on a chip (SoC) such as combinations of a DSP and a RISC processor together with various specialized programmable accelerators such as for FFTs and variable length coding (VLC). A stored program in an onboard or external flash EEPROM or FRA...

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

Audio loudspeaker and headphone virtualizers and cross-talk cancellers and methods use separate virtual speaker locations for different Bark frequency bands and a single reverberation filter for multi-channel virtualizer inputs.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 11 / 364,951 filed 3 Mar. 2006, which is a nonprovisional of U.S. provisional Patent Application Nos. 60 / 657,234, filed Feb. 28, 2005 and 60 / 756,065, filed Jan. 4, 2006, expired. The following co-assigned copending applications disclose related subject matter: application Ser. No. 11 / 125,927, filed May 10, 2005.BACKGROUND OF THE INVENTION[0002]The present invention relates to digital audio signal processing, and more particularly to loudspeaker and headphone virtualization and cross-talk cancellation devices and methods.[0003]Multi-channel audio inputs designed for multiple loudspeakers can be processed to drive a single pair of loudspeakers and / or headphones to provide a perceived sound field simulating that of the multiple loudspeakers. In addition to creation of such virtual speakers for surround sound effects, signal processing can also provide changes in perceived l...

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(United States)
IPC IPC(8): H04R5/00
CPCH04S1/005H04S2420/07H04S2420/01
Inventor TRAUTMANN, STEVEN D.SAKURAI, ATSUHIROKAKEMIZU, HIRONORI
Owner TEXAS INSTR INC