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Author Topic: FAO Industry Reps  (Read 1214 times)

pete007

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FAO Industry Reps
« on: December 21, 2004, 09:04:54 pm »

Hello All! I'm a final year student at Queen's University, Belfast and am currently on the lookout for some form of sponsorship for my final year project; please find below some details.

Regards

Pete Jones


Signal Processing and Sensing Solutions for dynamic sweet spot realisation with 5.1.

Peter Jones

Preface

The project described herein outlines the proposed research of Peter Jones, a final year student of Electrical & Electronic Engineering at Queen?s University Belfast (QUB). Research will be conducted in association with Professor Michael Alcorn (Director of SARC - Sonic Arts Research Centre), Professor Colin Cowan (DSP & Telecoms Research Group) and Dr. Martin van Walstijn (SARC).

Introduction

It is known that there is a ?sweet spot? within a surround sound field; traditionally this is at a point equidistant from each source. Ideally, the user would like to be in this position during every listening session to take full advantage of the multi-channel system.

It may not be possible for the listener to locate themselves in the sweet spot due to physical constraints (e.g. architectural shortcomings, aesthetic considerations), or the user may wish to move around (e.g. a sonic installation).

Conventionally, to accurately calibrate a sound reproduction system, an engineer would use calibration microphones and a real time analyser (RTA) to adjust delay lines on each discrete channel; ensuring that the sound from each speaker arrives coherently at the desired listening position. This is a time consuming, cumbersome method and it is clear that a more elegant solution is required; particularly for the residential and ?home cinema? market.

Objectives

The research group aims to design, build and test a system to create an actively calibrating artificial sweet spot within a surround field (initially 5.1).

System Overview

The listener?s location will be the control data for the system; a tracking device will be used to identify the speaker locations during an initial ?setup mode?. Once the speaker locations have been established, the tracking device will acquire the user?s changing location and pass the data to an intermediate visual realization (a map of the room showing speaker and user locations). Control information will then be forwarded to an audio package to appropriately manipulate each channel.

Initially, the system will concentrate on speaker delays, but if time permits phasing, amplitude and other parameters will be investigated.


Proposed System

Tracking:

The proposed tracking device is the Cricket Indoor Location System ? a hybrid product that uses a combination of ultrasound/RF to report a module?s location to within one cubic centimetre. The cricket system is administrated and manipulated in an open source Linux environment, passing data via a serial interface.

GUI

The control data from the Linux machine will be passed via a network port to an Apple Macintosh running Mac OSX. The research group will write an application to provide visual feedback of the system status ? user, speaker locations and mode of operation (setup/active mode). This intermediate piece of software will also manipulate the raw cricket data into a very usable form to be passed to the DSP.

Audio Processing

Cycling 74?s Max/Msp running on Mac OSX will be used to process and manipulate the audio. Audio interfacing will be via Digidesign HD hardware ? widely used within SARC.

Proposed Schedule

Date   Progress
December 2004   Take delivery of Cricket system and Linux workstation. Begin testing tracking system
January 2005
   Start GUI development in conjunction with Cricket deployment.
February 2005
1st ? 15th   Test Alpha version of GUI and ensure total functionality with Linux system
February 2005
16th ? 28th   Beta testing of GUI with data pass to Max/Msp.
March 2005
1st ? 4th   Begin quantative system testing in sonic lab for performance ? compare accuracy with microphone/rta measurements
March 2005
5th ? 15th   Complete testing in sonic lab with human qualitative assessment.
April 2005   QUB Megaw Lecture ? presentation by Peter Jones to N. Ireland branch of IEE, industry representatives and press.
May 2005   Submission of thesis to QUB and Industrial Sponsor



Approximate Budget

Note ? All prices include VAT


Product                                  Unit Price
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Karl P(eterson)

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Fine Idea, Already Commercially Done / Available.
« Reply #1 on: December 21, 2004, 09:42:32 pm »

For what it is worth to you, many systems already have this capability (I know, and own, a pioneer 49tx which has this feature, and believe I have seen it on systems from Denon, Yamaha, Lexicon, and possibly one from Onkyo) they not only calculate delay times, but also do phase, very minimalistic room resonance filtering, sub crossover setting as well as minimalistic speaker eq'ing.

In my experience with this system, it works splendidly and does so via a small omni directional microphone included with the unit. Comparing the results with a measurement suite, it worked fairly well. Excellent when considering it is consumer gear, and stellar when considering what these systems normally get subjected to under the guise of "setup"

Edit : This works for 7.1 and 7.2 systems

Karl P
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