Technical Notes

• TN023 - Over-Under Cable Coiling

  Tips for rolling up cables in a convenient and safe way.

• TN021 - EN 1793-6 and EN 16272-6 Measurement Procedure

  Using Zircon system to measure the insulation properties of a sound barrier.

• TN020 - EN 1793-5 and EN 16272-5 Measurement Procedure

  Using Zircon system to measure the reflection properties of a sound barrier.

• TN019 - EN 1793-4 and EN 16272-4 Measurement Procedure

  Using Zircon system to measure the diffraction properties of a sound barrier.

• TN018 - Zircon Alignment

  Practical problems and solutions for positioning the MA24 microphone array in front of a sound barrier.

• TN016 - STIPA measurements with DIRAC

  STIPA measurements are easy to perform in DIRAC v6, and now even easier in DIRAC v7.

• TN013 - The Zircon system for EN 1793 measurements

  The Zircon V2 system together with Dirac 7 provide a complete and easy to use solution for EN 1793 measurements.

• TN012 - Using Dirac for CEN 1793-5 measurements

  The latest update to 1793-5 requires the use of a 9-microphone array and modified calculations. This technical note describes the use of Dirac for this type of measurement. For more information, see the blog entry CEN 1793-5 Update

• TN011 - Using the B&K Type 2250 with Dirac

  The B&K Type 2250 Hand-held Analyzer can be used as a front end for Dirac. This document describes how to connect and set-up the 2250.

• TN010 - E-MU 0202 USB

  Installation, setup and calibration with Dirac. This USB sound device supports a sample rate of 192 kHz, and can be used for scale model measurements.

• TN009 - Terratec DMX6FireUSB

  Installation, setup and calibration with Dirac. This USB sound device supports a sample rate of 192 kHz, and can be used for scale model measurements.

• TN008 - Dirac Stimuli

  The Dirac product CD contains a number of sound files that can be used as external stimuli in asynchronous (open-loop) measurements. This technical note describes these files and their use.

• TN007 - Impulse To Noise Ratio INR

  Describes the INR parameter, which represents the decay range of an impulse response. The INR can be used to qualify acoustical impulse response measurements.

• TN006 - Insulation Measurements Using Dirac

  Methods are described to measure the airborne sound insulation, e.g. between two rooms. Dirac is used to measure the relative sound levels as well as the reverberation time.

• TN005 - Practical Tips And Hints For Dirac

  This technical note intends to clarify where you should pay special attention before and during a measurement session, what problems may occur and how you can avoid or solve these.

• TN004 - G From Imported Room Responses

  How to use Dirac to calculate the sound strength G from impulse responses that were not measured using Dirac.

• TN003 - Using the Digital Input of the Digigram VXpocket

  The Digigram VXpocket is a high quality PCMCIA sound device, which gives excellent results when used with Dirac. Due to incompatibilities between the VXpocket driver software and Dirac, it is not possible to calibrate the digital input of the VXpocket. This technical note describes a procedure that will allow you to use the digital input as if it were calibrated.

• TN002 - Measuring Speech Intelligibility Using Dirac

  Starting from basic principles, this technical note introduces the parameters used in speech intelligibility measurements such as STI and RASTI. It also describes the hardware needed for successful measurements, calibration requirements and hints on how to handle common measurement situations.

• TN001 - Measuring Impulse Responses Using Dirac

  This is an introduction to using Dirac. The first part of this technical note introduces some of the theoretical background of Dirac. The second part illustrates the practical use of Dirac.