Measurement:System Gain Changes

System Gain Changes

Imagine a noise generator driving a power amplifier and a loudspeaker (Figure 2.11). If the voltage out of the noise generator is raised by 6 dB, what happens?

This means that, in a linear system, a level change ahead of any components results in a level change for that same signal in all subsequent components, although it might be measured as quite different voltages or wattages at differing points. The change in level at any point would be the same. We will work with this concept a little later when we plot the gains and losses through a total system.