- Real time factor
The real time factor (RTF) is a common metric of measuring the speed of an automatic
speech recognitionsystem. It can also be used in other context where an audio or video signal is processed (usually automatically) at nearly constant rate (e.g. reading music from a CD).
If it takes time to process an input of duration , the real time factor is defined as:.If, for example, it takes 8 hours of computation time to process a recording of duration 2 hours, the real time factor is 4. When the real time factor is 1, the processing is done "in real time". It is a hardware dependent value.
The accuracy of a speech recognition system on the other hand is measured with the
word error rate.
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