4.0 | 6 ratings Rate this file 232 downloads (last 30 days) File Size: 1.84 MB File ID: #9603

Sound Level Meter

12 Jan 2006 (Updated 13 Jan 2006)

Implements real-time spectrum analyzer and displays decibel level.

File Information
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)
Zip File Content
Other Files	analyzeSignal.m, estimateLevel.m, filterA.m, initDisplay.m, initSoundCard.m, runCalibration.m, SLM.m, SLM.pdf, stopSoundCard.m, updateDisplay.m, examples/trashtruck.wav

Tags for This File
Everyone's Tags	decibel meter, fft, sound level meter(2), spectral analysis, spectrum analyzer
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Comments and Ratings (10)
18 Jan 2006	Rupesh Sancheti	the information given about the products using matlab is excellent
23 Sep 2006	Piyorot Khongchuay	cool
18 Oct 2006	radwa magdy
05 Dec 2006	kesho hassan	it is goog
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
18 May 2007	smekfm gtlo	i am to try this software
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.
05 Jun 2008	nguyen quy	I want to see the source coding
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.
25 Mar 2009	Brian	Cheers, great help as tutorial on real-time data aqusuisition

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Tag Activity for this File
Tag	Applied By	Date/Time
spectral analysis	Douglas Lanman	22 Oct 2008 08:12:16
sound level meter	Douglas Lanman	22 Oct 2008 08:12:16
decibel meter	Douglas Lanman	22 Oct 2008 08:12:16
fft	Douglas Lanman	22 Oct 2008 08:12:16
spectrum analyzer	Douglas Lanman	22 Oct 2008 08:12:16
sound level meter	Pawlord Zimnowodzki	02 Nov 2009 02:27:10

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