Windshields fitted to outdoor measuring microphones serve a dual purpose – to reduce wind-generated noise, and to protect the delicate microphone from damage by environmental factors such as rain, ice and dust. However, the presence of a windshield inevitably affects the directional and frequency responses of the measuring system. This paper presents results of measurements on the directional and frequency Read More…
Archive | November, 2011
Motorbike exhaust sound levels for track and race days – An overview from a rider
As a motorbike track day enthusiast and rider myself, I have friends regularly asking me for advice when it comes to what is the maximum sound level their bike exhaust noise level can be. When I reply with the question, “what circuit are you racing at?” they seem surprised that this is relevant and that I was unable to provide Read More…
New Training Course Dates for 2012
We’ve added 3 new dates for in 2012 our Cirrus Product Training Courses (CPTC). These are: Wednesday 14th March 2012 The East Midlands Conference Centre Thursday 29th March 2012 Castle Combe Circuit Wednesday 4th April 2012 Oulton Park Circuit, Cheshire Wednesday 11th April 2012 Brands Hatch Circuit, Kent For more information, click here or visit our website at www.cirrusresearch.co.uk/training/
Job vacancy at Cirrus – IT Supervisor
We have a new job vacancy at Cirrus, an IT Supervisor. Reporting to the Managing Director, this role requires taking full operational responsibility for the company’s IT infrastructure and to provide IT support and development across our group of companies. The ideal candidate should be self-motivated and should be comfortable presenting to small groups of internal staff, be personable, self-organised Read More…
Noise levels from fireworks – a very unscientific measurement!
This year, Bonfire Night (5th November for anyone who doesn’t know) fell on a Saturday this year and despite the forecast of rain, myself and my colleagues Gill Cussons, Justin Barker and Nigel Palmer braved the weather with the aim of measuring the noise levels at our local fireworks displays. We didn’t set out any rules as to where these Read More…
Noise Induced Hearing Loss – An Introduction
There are over an estimated 9 million hard of hearing individuals in the UK (source: Action On Hearing Loss (RNID), 2005 survey). The overwhelming reasons for hearing loss are listed as being age-related and noise-related, very much in-line with other Western world countries. The big difference is that while age-related hearing loss is a natural process that we can do Read More…
What are First Octave and Third Octave Band Filters?
When more detailed information about a complex sound is needed, the frequency range of 20Hz to 20kHz can be split into sections or bands. This is done electronically within a sound level meter.
Download our new eBook – Top 10 Blog Posts on Noise Measurement
Our new eBook “Q&A – The top 10 posts on our blog” is now available for download. Throughout 2011 we’ve been posting information and answers to questions from our customers, distributors and sales team on our blog at cirrusresearch.co.uk/blog. This book contains the top 10 posts that you, our customers, have been reading and commenting on. Some of the posts have Read More…