hearing test device using pure tone audiogram

[neophyte04]

This is our final year project
we will make a device that will test the hearing perspective
of a person using a pure tone audiogram(existing) without an specialist
it will produce a ascending sound with an specific frequency
it will also graph the range of frequency that the person was able to hear
and will print out an evaluation sheet

1. The problem is we are still confused on what program or micro controller to be used
we think of using Matlab because it can produce sounds and we are familiar with that program
we also consider microcontroller that can produce sound like
8051 Microcontroller (AT89C51) based sound generation


2. We are also thinking to add the speech test
this is how it works

http://www.actiononhearingloss.org....earing/check-your-hearing/take-the-check.aspx



we we're still researching on how we can make this
and what to used..

 

[poor mystic]

I'm sure Matlab is fine for generating pure tones, and the amplitude should be finely controllable too. However you'll still need to calibrate the sound generator, because headphones are not all equal and will produce diferent sound levels for the same power input.
I'd guess that developing a calibration technique will be a big part of the work.

 

[neophyte04]

thanks for your insight sir, we may be using matLab
since we don't have enough time to study other program
our title defense is on Thursday and Friday

 

[Digital_Angel_316]

This is our final year project
we will make a device that will test the hearing perspective
of a person using a pure tone audiogram(existing) without an specialist
it will produce a ascending sound with an specific frequency
it will also graph the range of frequency that the person was able to hear
and will print out an evaluation sheet

1. The problem is we are still confused on what program or micro controller to be used
we think of using Matlab because it can produce sounds and we are familiar with that program
we also consider microcontroller that can produce sound like
8051 Microcontroller (AT89C51) based sound generation


2. We are also thinking to add the speech test
this is how it works

http://www.actiononhearingloss.org....earing/check-your-hearing/take-the-check.aspx

we we're still researching on how we can make this
and what to used..

I would start the project with a Requirements Specification, your professor
(teacher?) should require it. Detail the features and functions that are
required. A rough draft outline may be just a page or two. Follow up when
you have had a peer review with others on your team to finalize at least a draft
copy. Make a table of Frequencies, Times, User Interactions, Outputs and
Processing. It may contain a simple block diagram and flow chart of the
requirements (a processor is not a requirement, it is an implementation detail).
You should also develop a simple SCHEDULE and BUDGET outline. This should
be presented to your professor as a key milestone of your work effort and each
subsequent design phase should also go through peer review and higher level
(professor, boss, client, customer) review and acceptance.

The next step is to develop a Design Specification. This will take the
REQUIREMENTS and relate them to an implementable design. It is not until
this step that you concern yourself with choosing components. The DESIGN
implementation is inferred from the REQUIREMENTS.

From there you can begin to think about design implementation details. What
input devices, what processor, what output mechanisms (switches,
Ucontrollers, speakers, printers, recording media, packaging, layout etc.)

Finish up with a Design Disclosure document. This will describe the theory of
operation, have a block diagram and flow chart and walk through the
operation. Much of it can be pulled from the Requirements and Design
Specifications if done properly. This will also include a Schematic, Code
listings Bill of Materials, and perhaps operating instructions (to save you from
writing a 'Users Manual' which some might also require depending on the
project scope)

The PROCESS is just as (more) important than the implementation. You could
do it on a PC, in a cell phone app or a dedicated device you design and build.
The requirements will drive these sorts of selections and involve Research and
Tradeoffs.

Sorry, I took out all the fun and haphazard approach. It is a real discipline to
walk through the design process. In the end it saves a lot of time and money
from false starts, misunderstood 'requires and desires' and provides greater
satisfaction to the designer (or design team) and most imortantly to the
'customer' / end-user.

Time and cost constraints are a part of the tradeoff process and the above
mentioned process is not completely linear / sequential. You may already
have a favored platform or development tools, or expertise for example that
leads you to 'require' certain implementation details -- same concept with
budgetary aspects.

Best wishes and Godspeed. Get back to us when you are further into the
project.

 

[neophyte04]

Thanks for the reply
we were about to finish the project
but we are having problems with our headphone
we used the HDA 280 headset for audiometer
The problem is the headphone is producing noise
but when the test tone is sampled the noise is gone
test tones are 250, 500,1000,2000,4000 and 8000 Hz

we tried to put high pass filter
but there is no sound produced on the headset
even the test tones

Does anyone knows what to do
to reduce the noise?

I hope you could give some idea
we were really running out of time


Thank you