I hope you’ve learned something from this article. ![]() dB(A) The decibel A filter is widely used. Let’s start with this simple math that you’ve learned in the middle school: dB(A) dB(B) dB(C) Download and print Sound Pressure Level - db(A), dB(B) and dB(C) criteria chart. So we need to discuss logarithm before talking about dB. The decibel scale is given by: (2.2) Where L again denotes the relative difference between the two powers P 2 and P 1 on a logarithmic scale. Using decibels involves working with logarithms, and this is the very minimum math knowledge you should have. However, this bel scale was found to be too coarse so the scale was modified to give the decibel scale where individual steps on the scale are one-tenth the size of those on the bel scale. This brief tutorial will help you clarify the difference between working with decibels and working with linear values. The Decibel Scale You may have noticed that when people talk about the loudness of a sound, they describe it in units of decibels rather than watts per meter squared. I saw a lot of young RF fellows who ignored the importance of understanding dB, eventually realized that they need to learn this simple term well if they want to go further in the RF field. In this post I’ll do the best to explain the basics in plain words and hopefully you’ll not have any more confusion after reading it.ĭealing with numbers for gain, voltage, and power that mix dB, dBm, dBc, dBW, dBmW, watts, milliwatts, volts, millivolts, etc., often requires converting back and forth between linear values and decibel values. Unfortunately, if you can’t thoroughly understand this important scale, then you will have tremendous difficulty to get your RF expedition moved on. Visit ABOUT to see what you can learn from this blog.’ĭB (Decibel) is the most important and often used scale in the RF field, but it’s also understandably difficult and confusing for someone just being introduced to it. The decibel scale is widely used in various fields to measure and compare sound levels. Applications of Decibel in Sound Measurement. For instance, a rock concert can reach levels of 100 decibels or more, while a jet engine at close range may produce sound levels of 140 decibels. ‘Note: This is an article written by an RF engineer who has worked in this field for over 40 years. As the sound level increases, so does the decibel value.
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