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question about speech level

To: AUDITORY@xxxxxxxxxxxxxxx
Subject: question about speech level
From: ali fallah <ali.fallah@xxxxxxxxx>
Date: Mon, 23 Jul 2012 14:15:26 +0430
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Delivery-date: Mon Jul 23 11:39:49 2012
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Reply-to: ali fallah <ali.fallah@xxxxxxxxx>
Sender: AUDITORY - Research in Auditory Perception <AUDITORY@xxxxxxxxxxxxxxx>

Dear List

For creating speech in desired level, I have an AC40 audiometer that produce speech signal in selected dB SPL from a wav file. The recordings has silent periods before and after speech signal. If I delete silent periods before and after the speech signal, the sound intensity that audimeter produce, will not change. Now I want to prepare a mixture of speech and noise in optional SNR values in Matlab but the RMS value of speech signal depends on silent gaps.

I have two question about this: I want to know for speech signal that is nonstationary, how desired level in dB SPL is set . Also how can I mix speech and noise in Matlab by setting noise in desired value (for example noise level=65dBSPL and SNR=-10 until we have speech in 55 dBSPL).

I will grateful if anyone guide me about this and let me know about related documents.

best regards

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