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ISO 226 Equal-Loudness-Level Contour Signal

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company name:
Jeff Tackett
license: Shareware
minimum requirements: MATLAB 7.0.1 (R14SP1)
functional limitations:
ISO 226 Equal-Loudness-Level Contour Signal description
This function will return a 29-point equal loudness contour for your desired phon level. The frequencies evaulated in this function only span from 20Hz - 12.5kHz, and only 29 selectivefrequencies are covered. This is the limitation of the ISO standard.In addition the valid phon range should be 0 - 90 dB SPL. Values outside this range do not have experimental values and their contours should be treated as inaccurate.(Limitation due to standard)If more samples are required you should be able to easily interpolate these values using spline().*For more information regarding this method refer to ISO 226.------------------------------------------------------------Usage: [SPL FREQ] = ISO226(PHON); PHON is the phon value in dB SPL that you want the equal loudness curve to represent. (1phon = 1dB @ 1kHz) SPL is the Sound Pressure Level amplitude returned for each of the 29 frequencies evaluated by ISO226. FREQ is the returned vector of frequencies that ISO226 evaluates to generate the contour.------------------------------------------------------------
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