Ultrasonic Devices & Audibility – Hearing the Inaudible by Peter Mapp – Organised by London Branch of IoA

16 September - 16 September 2020

6:00 pm - 8:00 pm

Webinar - Non-IoA members need to register via email below

More info

In recent years there has been a resurgence of interest in Ultrasonic sounds & emissions, culminating in a special addition of JASA dedicated to the topic in 2018. Ultrasonic devices have a wide range of application ranging from ultrasonic tape measures and car proximity warning systems to pest deterrents and the safety surveillance monitoring of public address and sound systems used for emergency purposes. Other uses include ultrasonic cleaning and medical applications as well as antisocial behaviour deterrent devices, wind speed indicators and ‘inaudible’ ringtones. The talk will take a brief look at a number of typical applications and discuss the human sensitivity to ultrasound and the potential audibility, typical levels and issues that some of these devices and applications produce.

Peter Mapp is principal of Peter Mapp Associates – a specialist acoustics and electroacoustics consultancy. Peter has designed and commissioned over 700 sound systems around the world, many of which incorporate ultrasonic signal surveillance monitoring. He has extensively researched these techniques and their associated unintended emission levels as well as investigating the emissions from pest deterrents and other ultrasonic devices. Peter is also well known for his research relating to the intelligibility of sound systems and improving the performance of assistive listening systems & deaf aid loops. He is a member of several British and International standards committees. Over the years Peter has collaborated with several university research departments and institutions and is currently visiting professor of acoustics at London South Bank University and is the 2020 recipient of the IOA Engineering Medal


Topics and speakers for the evening meetings are generally identified and organised by the London Branch Committee, but we always welcome new ideas and suggestions for future presentations. If you have any ideas or suggestions, or may even like to give a presentation yourself, please contact the London Branch Committee (Roslyn Andrews:


This event is free to attend. If you are a member and would like to attend you can access the zoom login details at

For non-members please email for Zoom login details

Posted on 2nd September 2020 in Communication and Room Acoustics, Events, Hearing