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Sound Level Meter

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Sound Level Meter

by Douglas Lanman

 

12 Jan 2006 (Updated 13 Jan 2006)

Implements real-time spectrum analyzer and displays decibel level.

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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

Real Time Octave Analysis and Spectrum Scope inspired this file.

This file inspired Noise Measuremet With Pcsgu250 And Matlab Implementation.
Required Products Data Acquisition Toolbox
MATLAB release MATLAB 7.1.0 (R14SP3)
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acoustics(2), decibel meter(2), fft(2), filter, measurement, sound(2), sound level meter(2), spectral analysis, spectrum analyzer, weighting
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Comments and Ratings (14)
02 Feb 2012 Chi

how to run the file ?
25 Jun 2011 Joachim  
20 Feb 2010 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.>>

27 Dec 2009 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

25 Mar 2009 Brian

Cheers, great help as tutorial on real-time data aqusuisition
28 Oct 2008 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.

05 Jun 2008 nguyen quy

I want to see the source coding

28 Feb 2008 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.

18 May 2007 smekfm gtlo

i am to try this software
05 Jan 2007 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

05 Dec 2006 kesho hassan

it is goog
18 Oct 2006 radwa magdy  
23 Sep 2006 Piyorot Khongchuay

cool
18 Jan 2006 Rupesh Sancheti

the information given about the products using matlab is excellent

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