Real time factor

﻿
Real time factor

The real time factor (RTF) is a common metric of measuring the speed of an automatic speech recognition system. 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).

=Definition=

If it takes time $\left\{P\right\}$ to process an input of duration $\left\{I\right\}$, the real time factor is defined as:$RTF = frac\left\{P\right\}\left\{I\right\}$.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.

Wikimedia Foundation. 2010.

Look at other dictionaries:

• Real-time computer graphics — is the subfield of computer graphics focused on producing and analyzing images in real time. The term is most often used in reference to interactive 3D computer graphics, typically using a GPU, with video games the most noticeable users. The term …   Wikipedia

• Real Time with Bill Maher — Genre talk show Présentation Bill Maher Pays  États Unis Langue Anglais Nombre d …   Wikipédia en Français

• Real-time vs. turn-based gameplay — A debate has emerged between fans of real time and turn based games (usually some type of strategy game or role playing game) based on the merits of the real time and turn based systems.cite web | last =Saltzman | first =Marc | title = Nations… …   Wikipedia

• Real prices and ideal prices — refers to a distinction between actual prices paid for products, services, assets and labour, and computed prices which are not actually charged or paid in market trade.Ideal prices, expressed in money units, can be estimated, theorized or… …   Wikipedia

• Time-evolving block decimation — The time evolving block decimation (TEBD) algorithm is a numerical scheme used to simulate one dimensional quantum many body systems, characterized by at most nearest neighbour interactions.It is dubbed Time evolving Block Decimation because it… …   Wikipedia

• Real Business Cycle Theory — (or RBC Theory) is a class of macroeconomic models in which business cycle fluctuations to a large extent can be accounted for by real (in contrast to nominal) shocks. (The four primary economic fluctuations are secular (trend), business cycle,… …   Wikipedia

• Real estate economics — is the application of economic techniques to real estate markets. It tries to describe, explain, and predict patterns of prices, supply, and demand. The closely related fields of housing economics is narrower in scope, concentrating on… …   Wikipedia

• Real estate appraisal — Real estate appraisal, property valuation or land valuation is the practice of developing an opinion of the value of real property, usually its Market Value. The need for appraisals arises from the heterogeneous nature of property as an… …   Wikipedia

• Time value of money — The time value of money is the value of money figuring in a given amount of interest earned over a given amount of time. The time value of money is the central concept in finance theory. For example, \$100 of today s money invested for one year… …   Wikipedia

• Time dilation — This article is about a concept in physics. For the concept in sociology, see time displacement. In the theory of relativity, time dilation is an observed difference of elapsed time between two events as measured by observers either moving… …   Wikipedia