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There is a lot of misinformation around about what the terms ‘audible’, ‘inaudible’ and ‘ultrasound’ mean. This post aims to give readers a better understanding of each, the reasons behind some of the confusion, and why the differences here matter.
Simply put, the term ‘audible’ means ‘able to be heard’. This may seem blindingly obvious, but as we’ll see — it sets the scene for more subtle distinctions later in this discussion.
When we say that we are ‘able to hear’ something, we are making a statement about several different characteristics of a particular sound and its acoustic context. Each of these qualities must be within certain ranges in order for the human auditory system to detect a sound.
A couple of the most significant qualities affecting human hearing of particular sounds:
Let’s assume here that the first one is controlled by us — that we have quiet conditions for listening, so that the main remaining 2 factors become a sound’s loudness and its frequency composition.
In terms of frequencies, the common definition for the human audible frequency range is 20Hz and 20kHz  — however our ear’s sensitivity to sound varies dramatically over this range.
Our ear is most sensitive between the ranges of ~2kHz and ~5kHz (see the dip in the graph above). This range of particular sensitivity corresponds directly to the main frequency components of human speech.
In our most sensitive frequency regions we are able to perceive sound pressure levels of under 20μPa — this corresponds to the vibrating air molecules which together constitute audible sounds over incredibly small distances, on the order of 1/100 of a millionth of a centimetre, or 1/10th the diameter of a hydrogen molecule .
This sensitivity changes not only with frequency of the sound, but with the age of the listener — with younger folk having a much greater sensitivity to higher frequency sounds. There are many different ways a person can lose hearing sensitivity, most commonly this happens as a natural process of ageing as we (unlike frogs fish) gradually loose the tiny hair cells in the inner ear ( presbycusis ) which translate vibration to electrical impulses finally interpreted by the brain.
Inaudible then — ‘unable to be heard’.
There may be multiple potential reasons for this — a sound could be inaudible over the background noise level (i.e. ‘masked’), could be outside the human audible frequency range, or be too quiet to be heard even in ideal listening conditions.
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In recent years, given the massive influx of tablets, mobiles and handheld devices, there has been a complete transformation in the way the average user accesses and interacts with online content. To keep up with this continual evolution, the elearning industry has been consistently revamping features of its existing tools/framework to provide comprehensive support for content creation for multi-device use.
New tools and frameworks have also been introduced in the market to cater to the burgeoning demand of creating responsive courses — one such name which is a standout in the elearning world is that of ‘Adapt Learning.’ Adapt’s dedicated focus to enabling creation of responsive content by technical and non-technical users has been garnering it significant praise among users. Its popularity which has been increasing by leaps and bounds is also greatly attributable to the fact that Adapt has been on a mission to ensure widespread use of its framework and authoring tool by making the entire source code accessible to users entirely free.Adapt Framework and Authoring Tool: What you need toknow
The ‘Adapt Learning Framework’ empowers the user to create elearning courses in HTML5 — its fundamental design enables the creation of responsive course content and the brand name ‘Adapt’ was chosen to embody it.‘Adapt’
The ‘Adapt Learning Framework’ was designed with developers in mind;
for non-technical users
the Adapt community then created a rapid authoring tool called
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’ based on the Adapt Learning Framework. It aims to allow non-tech users to create courses without the need to write any code. The authoring tool was initially rolled out only to customers of Learning Pool in October 2014. But it was reportedly received with such rave reviews that the ‘Adapt’ community decided to roll out a ‘free’ hosted version of the tool to everyone in April 2016.
An open source ‘Adapt Learning Framework’ was conceived and developed by Europe based eLearning tech companies and released in February 2014. Brought together by a common aim to “provide low cost, innovative e-learning solutions”; UK-based Learning Pool along with Sponge UK , Kineo came together to collaborate on their ambitious vision for the future.
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