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Now it's your turn. Please calculate the following: 1. In acoustics, the threshold of pain is approximately 120 dB SPL. How much pressure is this, in pascals? 2. Using a VOM (volt-ohm meter), you measure a 0.13 volt signal. How would you express this quantity in dBu? dBV? dBu? 3. Express -4 dBu using dBV. 4. What is the sum of two signals (-4 dBm and -3 dBm) in dBm? (Careful: will the sum of the two signals be lesser or greater than either signal alone? Make sure your answer makes sense.) 5. What is the sum of two signals (-4 dBV and -3 dBV) in dBu? (See caution above.) Make sure to always include units. Please post your calculations (and show your work!) accompanied by your observations: Can you see the value of using o dB references? Does anything remain confusing to you about working with o dB reference levels? Are there any additional insights that you can share with your fellow classmates to help solidify these concepts? 40 J 10' 18' 103 dB SPL Mic sensitivity: Mic Pad Mic preamp: Rec. level: Power Amp: Speaker Sensitivity: @ 4, fect 1 Pa yiclds -42 dBV -12 dB T 62 dB -6 dB 1.75V yields IW yicids 85 dB SPL 52 W into 812 @4

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Signal Processing Problems
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