Simcenter Testing Solutions Describing Sounds with Words

Simcenter Testlab



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Ever tried to describe the unusual sound a product makes with words?  Check out this reference (with example sounds) to decide the best word to describe what you are hearing. 

These words are commonly used in Noise and Vibration (NVH) engineering. 
Words are listed in alphabetical order below.  Be sure to use quality headsets to hear the full frequency range of the sounds.  Playback through inexpensive headsets and laptop speakers often do not fully reproduce the sounds. 

Word (Click to Listen)DescriptionExampleAdditional Information
User-added imageBroadband sounds have somewhat equal amplitude at all frequencies. No single frequency or tone "sticks out" above the others.Road and wind noise are common examples of broadband sound in a vehicle.White and pink noise broadband examples
User-added imageHigh frequency noise that sounds like a bird chirping.Pulley misalignment issues in a belt driven system can create chirping noise.Tone-to-Noise ratio and prominence ratio
User-added imageShort duration, high frequency noise. Sounds like clicking on a ball point pen.Short duration metal on metal contact (door slam, transmission shifter, etc). Making the duration of contact longer (by wrapping the metal in plastic or rubber) lengthens the contact and lowers the frequency range.Wavelets, kurtosis
User-added imageLow frequency noise that sounds like animal growl.Combustion engine under heavy load can produce growl.Modulation metrics
User-added imageHoot is a sudden unexpected high pitched sound similar to the that of an owl.When the frequency of the pressure waves match a resonance of air volume inside an exhaust system, a hoot noise occurs.Natural frequency and resonance
User-added imageA lugging sound rises and falls over time, instead of being constant level.An electric motor that binds while operating starts to make a lugging sound.Fluctuation strength sound metric
User-added imageThis sound is a word!Calculate a colormap of this sound to see the mystery word. Download mystery.ldsf or mystery.wav to analyze.Simcenter Testlab Throughput Processing Tips
User-added imageA ping is a transient noise with high frequency content that takes some time to decay.Pinging noises might be heard from a hot exhaust system system as it cools down and the metal contracts. Another example is golf club hitting a ball.Kurtosis
User-added imageBroadband sound where all octave bands have the same level.An artificial sound used in noise testing.Octaves and human hearing
User-added imageWhen two items hit each other repeated that contain loose parts.  When done repeatedly over time sounds like a baby rattle being shook.In transmissions, the unengaged gears can vibrate and hit each other repeatedly, causing rattle.Interpreting colormaps article with section on gear rattle
User-added imageLow frequency sounds that rise and fall many times per second. Sound is said to be modulated.Sporty sounding vehicles are said to have a degree of rumble in the exhaust note.Roughness sound metric
User-added imageA shrill or sharp sound has significant amounts of high frequency content.Sounds with high frequency content are often considered annoying. For example, a car door close with a lot of high frequency metallic sounds, instead of a solid sound. Or a vacuum cleaner with high frequency content.Sharpness sound metric
User-added imageSound made by liquid flowing back and forth in a container.Stopping a vehicle can cause the fuel in the fuel tank to shift, which creates a sloshing noise.Baffles in fuel tanks reduce slosh noise.
User-added imageShort duration, high frequency, sound.  Dominated by a single frequency.Brake squeal is caused by non-linear behavior of brake system: self-excited vibration drawing energy from the braking action.Tone-to-Noise ratio and prominence ratio
User-added imageSound like a sewing machine or a clock. A steady stream of short duration tick sounds.Fuel injectors in engines making ticking sounds as they release fuel.Kurtosis
User-added imageWhen a single frequency is much higher than surrounding frequencies, a sound is said to be tonal.Mosquitos make tonal sounds!Tonality
User-added imageBroadband noise where all frequencies are at same level. Similar to the sound of a waterfall.An artificial sound used in noise testing.White noise is an artificial broadband noise
User-added imageRapidly changing high frequency metallic sound, like a zipper.Gears that rapidly spin back and forth (example: electric power steering system) can produce zipper noise.Interpreting colormaps article with section on gear meshing
Know of other types of sounds that would be included? Feel free to let us know! Post a comment or email Scott MacDonald (

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KB Article ID# KB000045470_EN_US



Associated Components

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