Sound Level Meter

Implements real-time spectrum analyzer and displays decibel level.

Description

This tutorial/demo presents the design of a sound level meter in Matlab. The Data Acquisition Toolbox is used to implement a real-time spectrum analyzer. The decibel meter is implemented in the frequency domain using Parseval's relation.

Documentation is provided in the included PDF.

Further information is available at: http://mesh.brown.edu/dlanman.

Acknowledgements

The author wishes to acknowledge the following in the creation of this submission:
Real time octave analysis, Spectrum Scope

• Required Products: Data Acquisition Toolbox
• MATLAB release: MATLAB 7.1.0 (R14SP3)

[Rupesh Sancheti]

the information given about the products using matlab is excellent

[Piyorot Khongchuay]

cool

[radwa magdy]

 

[kesho hassan]

it is goog

[Steven Kolak]

.
MATLAB supports audio acquisition using the Data Acquisition Toolbox.

View the MATLAB sound resource page for additional demos, downloadable code examples, and user stories:
http://www.mathworks.com/sound

[smekfm gtlo]

i am to try this software

[Shufang Dong]

Generally ok, but with miscellaneous errors need to be correct such as the A-weighting filter should be applied to pressure square rather than pressure, and the last formula of RMS of filtered pressure should not be divided by delta t.

[nguyen quy]

I want to see the source coding

[sameer ahamed]

It is a nice model of Sound Level Meter. My observation is: In the code, A-weighting is performed in frequency domain (i.e. multiplication in frequency domain). I feel like, if the A-weighting is in time domain (filtering, of input signal which is sampled at variable sampling frequency), the computation of fft can be saved.

[Brian]

Cheers, great help as tutorial on real-time data aqusuisition

[umut arioz]

Those codes were helped me in my works. But I want to use them in simulink. But of course, some functions dont work with embeddeb functions in simulink. for example "find". did you do before to carry this program to simulink or Can you offer me some way instead of using "find" ? thanks

[sourabh]

when i run the SLM following errors come plz someone help me to remove them i am new to matlab
??? Invalid handle object.

Error in ==> updateDisplay at 23
set(figData.samplePlot,'YData',x);

Error in TimerFcn: '@updateDisplay'.
Invalid handle object.>>

[Joachim]

 

[Chi]

how to run the file ?