Daqarta
Data AcQuisition And RealTime Analysis
Scope  Spectrum  Spectrogram  Signal Generator
Software for Windows Science with your Sound Card! 

The following is from the Daqarta Help system:

Features:OscilloscopeSpectrum Analyzer 8Channel

Applications:Frequency responseDistortion measurementSpeech and musicMicrophone calibrationLoudspeaker testAuditory phenomenaMusical instrument tuningAnimal soundEvoked potentialsRotating machineryAutomotiveProduct testContact us about


Working With dBWhen a voltage is reduced by half, it is 6 dB. When it's doubled, it's +6 dB. Every halving or doubling changes the result by 6 dB, so 1/4 is 12 dB, 1/8 is 18 dB, and so on. When a voltage is changed by a factor of 10, there is a 20 dB change. So if the output is 60 dB less than the input, the voltage is 1/1000. A 10 dB change represents a factor of 3.16 voltage change. This value has the magical property that the reciprocal has the same digits, so 10 dB is a factor of 0.316 voltage change. A 1 dB change represents about 11% voltage change. Putting all these little rules of thumb together, you can make approximate conversions between dB and voltage in your head. Since adding or subtracting dB is the same as multiplying or dividing by the ratios, you can break an oddball value into separate steps. For example, if an output signal is 56 dB relative to the input, you can break it into 40, 10, and 6 dB. You know that every 20 dB is a factor of 10 (one decimal place) smaller, so 40 dB is 0.01. The 10 dB will make that 0.316 smaller, down to 0.00316. And since 6 dB is just 1/2, the overall output must be 0.00158 of the input. See also dB, dB From Voltages, Typical dB Applications, Working With dB, RMS "Sum" of dB Values, Formulas For Working With Sound 

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