VALIDATION AND IMPROVEMENT OF LOUDSPEAKER EXCURSION MODELS 

Location: McMahons Point, NSW

Duration: 3 months

Keywords: Mathematical Modelling, Physics, Audio, Matlab, Laser Measurement

Project Background

Smart amplifiers are audio amplifiers that measure the current and voltage supplied to a speaker in real-time. Current and voltage data is typically fed into a loudspeaker model that is used to predict the temperature of the speaker voice coil and the excursion of the speaker diaphragm. Predicted temperature and excursion is in turn used by speaker protection algorithms that allow loudspeakers to reach high loudness levels without damage.

The goal of this project is to characterise the performance of an existing loudspeaker model on a range of loudspeakers and then to provide guidance on potential improvements to the loudspeaker model.

Research to be Conducted

  • Characterise the accuracy of an existing speaker displacement model using a suite of representative loudspeakers that are used in laptops, tablets, televisions and mobile phones
  • Formulate hypotheses regarding how the speaker displacement model could be modified to improve accuracy
  • Validate hypotheses by modifying the speaker displacement model and carrying measurements on a range of representative loudspeakers
  • The resources required to complete this project (all to be supplied by Dolby) are:
    • A range of loudspeakers to test
    • A laser displacement measurement system
    • A PC with Matlab and a C compiler
  • Work pattern: Standard 38-hour week (including time for the intern to visit their Academic Mentor)
  • It is expected that the intern will mostly work on-site in the Dolby office
  • Supervision will be carried out by the Senior Manager, Sound Technology Platform Development

Skills Required

  • Experiment design
  • Data analysis
  • Ability to synthesize knowledge contained in technical literature into useful recommendations for the project
  • A high-level of mathematical fluency
  • Linear electronic circuit analysis

Expected Outcomes

  • A report describing the performance of the loudspeaker model on a wide range of loudspeakers
  • A prototype speaker model implemented in Matlab containing enhancements to the existing speaker model

This project will offer the intern a number of opportunities for on-the-job development. Opportunities include:

  • Working in a cross-functional agile development team
  • Learning from experienced software engineers, DSP engineers, electro-acoustics engineers and audio experts
  • Using sophisticated laser-based loudspeaker characterisation systems
  • Contributing to a commercial project

Additional Details

The intern will receive $3,000 per month of the internship, usually in the form of stipend payments.

It is expected that the intern will primarily undertake this research project during regular business hours, spending at least 80-90% of their time on-site with the industry partner. The intern will be expected to maintain contact with their academic mentor throughout the internship either through face-to-face or phone meetings as appropriate.

The intern and their academic mentor will have the opportunity to negotiate the project’s scope, milestones and timeline during the project planning stage.

To participate in the AMSI Intern program, all applicants must satisfy the following criteria:

  • Be a Domestic PhD student currently enrolled at an Australian University.
  • PhD candidature must be confirmed.
  • Applicants must have the written approval of their Principal Supervisor to undertake the internship. This approval must be submitted at the time of application.
  • Due to funding requirements of this project, applicants must have Australian Citizenship or Permanent Residency to apply. Any applicants not meeting this requirement will automatically be deemed ineligible for this project.
  • Internships are also subject to any requirements stipulated by the student’s and the academic mentor’s university.
Applications Close

23 October 2017

Reference:
INT – 0349