RPM Profile

This section describes the two types of tachometric signals, required to perform order analysis.

An RPM profile is a signal that represents the rotation speed in Revolution Per Minute (RPM).

• Pulse signal: Depending on the sensor, the number of pulses per revolution may be one, two, or any number. Most commonly an optical or magnetic sensor is used, usually delivering one or two pulses per revolution. This type of signal can be used by Sound: Analysis and Specification to calculate the RPM profile. You must specify the number of pulses per revolution, and the number of pulses to be used for averaging.

• Engine RPM profile signal: In some cases, the RPM information is directly provided as a signal of RPM. It can be directly measured from the onboard card of a vehicle, or from a specific measurement device. This type of signal can be directly used by Sound: Analysis and Specification as a RPM profile, its unit is rpm.