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The compression ratio is the ratio of the volume of the cylinder and the combustion chamber when the piston is at the bottom, and the volume of the combustion chamber when the piston is at the top. Automotive engineers can improve fuel efficiency and fuel economy by designing engines with high compression ratios.
In other words a rise of 10dB at the input results in a rise of only 5dB at the output â which is half as much, and hence a compression ratio of 2:1. Figure 2: In this plot, you can see the effect of different ratios (the light blue is 2:1, the light green 40:1) of downward compression at the same threshold.