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CHAPTER 1

SIM 3 Measurement Terminology

CHAPTER 1: SIM 3 MEASUREMENT TERMINOLOGY

A number of different terms are used within SIM 3, either to describe concepts of acoustic

measurement or to name speciﬁc methods and features in the hardware and software. This

section will deﬁne these key terms as they relate to SIM 3 and its functions.

SOURCE INDEPENDENT MEASUREMENT (SIM): Pioneered by Meyer Sound, SIM is a

Meyer Sound trademark for a highly developed analyzer for source independent measure-

ment. The technique is a dual-channel acoustical analysis method in which the excitation

signal may be independent of — not generated or determined by — the measurement sys-

tem. Source independent measurement uses faster, high-resolution algorithms that substan-

tially decrease errors and achieve more precision than conventional dual-FFT techniques.

It provides the information required to verify the components of a sound system including

frequency and phase response, polarity, distortion, dynamic range, coverage and more.

BRANCH: Branches are the key to the power and ﬂexibility of the SIM 3 audio measurement

system. In SIM 3, a branch consists of three measurement points: Console, Processor, and

Microphone (deﬁned below). SIM 3 is continuously and simultaneously measuring all three

points of the Live Branch — the complete audio pathway from source to microphone cur-

rently selected for measurement. Measurements are taken at:

■ Console: The audio input into the sound reinforcement system (source), typically the

output of a mixing console or other source.

■ Processor: The audio output from the signal-processing chain that lies between the

console output and the ampliﬁer input. Typically this chain includes equalizers and delay

lines. This measurement point is exactly the same as the input to the ampliﬁer / loud-

speaker.

■ Microphone: The output of a measurement microphone located at some position in the

venue that captures the audio from the loudspeaker(s) within the room.

The SIM 3 software user interface allows an unlimited number of branches — each contain-

ing a Console, Processor, and Microphone measurement point — to be deﬁned and selected

as the Live Branch. Measurements begin as soon as the branch is selected, and are dis-

played in a variety of ways.

The SIM 3 analyzer has its own front-panel connectors, and can also add specialized multi-

channel line and microphone switchers for even greater ﬂexibility. Via these devices, SIM 3

can be connected to all points of interest in the sound reinforcement system. As long as a

branch contains all three measurement points, any combination can be created.

By selecting any deﬁned branch within the SIM 3 software, the user can easily switch be-

tween and measure different parts of the system without having to physically re-patch con-

nections. See "Chapter 3: SIM 3 Conﬁgurations and Branches" for further details.

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Meyer Sound SIM 3 Guía de usuario Pagina 9