A lower frequency of say 440hz to 1000hz you will see the two periods come closer and closer together, this is how many cycles there are per second (440 cycles per second or 1000 cycles per second for the above frequencies).īelow there are three examples of pitch of low, medium and high frequencies.
When visualising a sine-wave frequency through an oscillator, you will it’s span between two periods change with frequency. The length of a sound is the measured from the moment it’s conducted to it’s inaudibility (this may be different on digital systems as audibility is subjective) Frequencyįrequency (measured in Hertz or KHz) is related to Pitch, this means that an increase in Hz would be an increase in pitch, you would say the sound is high pitched at something around 8000hz (8khz) or above. You will see this come up time and again in the world of soundproofing.īelow you will find an infographic, highlighting common sounds being generated at that dB level. A common expression is that a 10dB increase in Sound Pressure Level is a doubling of the perceived loudness, 50% louder, inversely, a 10dB decrease in Sound Pressure Level is halving the perceived loudness – a 50% reduction in sound transmission. Sound Loudness (measured in phons) is closely related, although not identical to Sound Intensity, we would use a Loudness scale more often to give more relatability to sound. It’s measurement is based on a logarithmic scale, not linear “ A logarithm is the power to which a number must be raised in order to get some other number “ – this is because we hear sounds in such a large magnitude, on a dB scale this is often referred to as Sound Intensity. The importance of this measurement and formula gave acousticians a baseline to measure sound and is to this day, is the standard. dB is named in honour of Alexander Graham Bell (bel) of Bell System in the United States. Decibel (dB)ĭecibel (dB) is a measurement that was first implemented and used in the early 20 th century to measure the ratio of two powers, or a quality that is related to the power Sound Intensity as an example. Sound excites our sensation of hearing, these sound waves meet our ear drum and it is then processed throughout the auditory system and reproduced as the sounds we hear.
Sound is an energy that moves in the form of vibration, both through solid and airborne mediums and can be high influenced by temperature, humidity, wind direction and density of the medium it’s travelling through (highly important for soundproofing). In ‘ What is Sound?’, we want to give you the knowledge to help understand sound on a basic level, to help explain some of the content on our website and give it some context. We, as humans, naturally seek a space where we can feel at home, or at comfort in where we have a high level of privacy to conduct our daily lives and to be able work without little to no interference.Īs movement of businesses and homes are now more city orientated than ever, we see buildings of multiple occupancy, so for example a building may have a gym, shop, bar as well as homes all together – it is important to make sure guidelines and recommendations are followed, and the best soundproofing solutions are installed to tackle them. The title, Peace, Quiet and Productivity helps fit nicely with our Mission Statement – Creating Quieter Spaces Together, it is our mission to put you in the sonic driving seat and tackle these issues with us head on. In this guide, iKoustic want to give you an overall knowledge of sound – to help give you some context of how sound works, how it could affect you and what you can do about it, and how sound may benefit us.
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