4dNoise Introduces Next Generation Acoustic Calibration System to Hong Kong in Meeting Local Relevant Requirements

airflow resistance measuring system nor1504A

4dNoise gladly introduces the next generation acoustic calibration system of Norsonic to Hong Kong with said calibration system designed to meet all the local requirements and international standards. It is a system that provides quick and accurate calibration of instruments for measuring sounds through three varying modes. Apart from the different modes, the system also comes equipped with test report generator which is fully configurable, not to mention it comes with incorporated self test functionalities.

Apart from the launch of the acoustic calibration system, there was a seminar that was held on November 2015 which has generated a lot of discussions and interests from many of its attendees. The attendees of the seminar came from various sectors, from the government, private laboratories and acoustic consultants from all over the country. Some of the topics that were discussed in the seminar tackled topics including the importance of calibration, the standards of calibrating sound level meters, maintenance of the system and more. The calibration system is important being that it is an off the shelf system that can possibly meet all the relevant requirements but only at costs that is but a fraction of those of 4dNoise’s competitors.

Basically, the next gen acoustic calibration system is an all-in-one system that is fully automated and is readily available for upgrade. This system also makes it possible for a person to build their very own acoustic calibration laboratory that conforms to the international standards such as DIN45657, IEC61672, IEC60651 and more. The acoustic calibration system also offers varying features such as test signals that comply with international standards on calibration and many others as well. As for the three different interface modes of the system, it can be manual, semi-automated or fully automated.

Additionally, when it comes to calibration of microphone’s frequency response, it uses acoustical or electrostatic method. Aside from all these, there are many other features that the system has to provide including the built-in self test functions and fully generated test report. Many of those who have been in the seminar have given positive reviews for the system. Some has even quoted that “The quiet chamber is very innovative,” and that “The sound isolating gadget is very handy and innovative.”This just shows how the new gen acoustic calibration system has provided great advantages when it comes to sound calibration. It can clearly change the way that the field of acoustics is today and lead it to a good future ahead of it.

To know more about the acoustic calibration system, please visit https://4dnoise.com/sound-noise-and-vibration-systems/nor1504a-calibration-system-for-sound-level-meters-microphones-and-sound-calibrators/.  For inquiries, please email at demo@4dNoise.com.

Calculation of Speech Transmission Index in Rooms


Sufficient acoustic quality of speech communication is very important in many different situations and places. The most known available objective method for measurement and prediction of speech intelligibility is the Speech Transmission Index (STI), described in the international standards IEC 60268-16 and ISO 9921. A new application note on how to perform correct predictions in ODEON is available on the Application Notes page.

Two cases of speech transmission index are discussed: Direct communication between two people in the same environment and public address (PA) systems where an electro-acoustic system is used to address a group of people.

A high signal to noise ratio (SNR) improves STI but the obtainable value may be limited by Sound Pressure Level design criteria. An example of calculation is shown below where the STI from a PA voice alarm system is simulated . In this case the STI should be at least 0.35 in the area where people have access, but at the same time a 1 KHz alarm tone should remain below 115 dB.

Read the whole application note here.


DesignBuilder announcing the launch of new v4 software

Simulation Made Even Easier!

DesignBuilder v4 adds a substantial set of new features and improvements compared with v3, including a major overhaul to the modeller to make it even more flexible and productive. For a full list of all new features please visit our website.

This is our biggest release ever and we would like to show you some of the major new features and improvements in a live webinar session on July 17th 2014. This is a great opportunity for you to learn more about the new and existing simulation tools within DesignBuilder and how these can benefit you. Places are limited, so please register here



SoundPLAN supporting ICBEN 2014


ICBEN is the International Commission on Biological Effects of Noise. Its goal is to promote a high level of scientific research concerning all the aspects noise-induced effects on human beings and on animals including preventive regulatory measures and to keep alive a vivid communication among the scientists working in that field. ICBEN is a non-profit organization that has no legal identity of its own and entirely depends on its members and its officers that voluntarily work for the organization. The means to achieve its ambitious goals are mainly based on the unique structure of ICBEN.