Listen’s New Enhanced Perceptual Rub & Buzz Algorithm

Not all distortion is audible. Perceptual Rub & Buzz measurements identify only those devices with audible Rub & Buzz defects, rather than all Rub & Buzz defects. Basing end-of-line pass/fail decisions on this metric increases yield while maintaining customer satisfaction.

Listen’s new enhanced Perceptual Rub & Buzz algorithm is the first to perform better than the human ear. Its proprietary noise reduction technology and advanced perceptual algorithms make its performance in a noisy factory environment comparable to the performance of a human ear under normal listening conditions. In other words, it is the only perceptual Rub & Buzz metric that accurately correlates real-world end-of-line results with listener perception.

Furthermore, it is highly repeatable, simple to configure and set limits, and can be simultaneously implemented with other end-of-line tests with no increase in overall test time.

Watch It

Did you miss our launch event? Or was it so interesting you want to watch it again or share with colleagues? Check it out here:

Read About It

Product Flyer:

A brief summary of the new enhanced Perceptual Rub & Buzz algorithm with an explanation of how it works and the results it achieves.

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Article: The Evolution of Production Line Rub & Buzz measurements

A detailed article from AudioXpress that discusses production line Rub & Buzz measurements from 1995 to the current day. It covers everything from the earliest conventional algorithms to the development of our newest perceptual metrics, explaining how the metrics complement each other for end-of line tests.

Read More

Hear It

Check out how our ePRB algorithm correlates with your hearing with our listening test!

Here are three recordings of speakers with varying levels of distortion, and one reference recording of a speaker with little to no distortion. Listen to each file, submit your answers, and see how the SoundCheck algorithm compares to your ears.

Just a couple of things to note:

  1. This is a recording which will be played through the device you are using. Any distortion introduced by your device will affect your perception, so we recommend using good quality speakers or headphones.
  2. Rub & buzz defects are hard for the untrained ear to detect compared to, say, an incorrect frequency response – some people may not be able to hear the distortion at all.

Your Results

Here’s how what you heard compares to both the new enhanced Perceptual Rub & Buzz and conventional normalized Rub & Buzz.

Speaker 1

ePRB heard: Sounds Good

Speaker 2

ePRB heard: Badly Distorted

Speaker 3

ePRB heard: Borderline Distortion

ePRB measurement for Speaker 1

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You can see here that the maximum perceptual distortion is about 10 Phons. We consider this to be about the threshold of detection for a trained listener

ePRB measurement for Speaker 2

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You can see here that the maximum perceptual distortion is over 40 Phons. This level of distortion is audible by most people.

ePRB measurement for Speaker 3

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You can see here that the maximum perceptual distortion is about 14 Phons. This is slightly above the threshold of perception, and we would expect that a trained listener may be able to detect this, but an untrained person likely would not.

Normalized Rub & Buzz distortion measurement for speaker 1

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This graph shows the traditional normalized Rub & Buzz distortion for the same speaker. You can see that it is low across the spectrum.

Normalized Rub & Buzz distortion measurement for speaker 2

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This graph shows the traditional normalized Rub & Buzz distortion for the same speaker. Significant Rub & Buzz is detected throughout the spectrum, particularly in the 1-5kHz range.

Normalized Rub & Buzz distortion measurement for speaker 3

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This graph shows the traditional normalized Rub & Buzz distortion for the same speaker. You can see that although there is some distortion, it is about half that of the speaker to the left in the 1-5KHz range.

Try It

Ready to try it?

If you already have SoundCheck 20, you already have access to this innovative algorithm at no extra cost! Simply download our free ePRB demo sequence and try it out. This pre-written sequence will walk you through the process of measuring and analyzing your speakers, so all you need to do is grab some speakers, run the sequence and compare the SoundCheck results to what you hear (or documented subjective analyses).

Get Sequence

If you don’t have SoundCheck, or haven’t yet upgraded to the latest version, we can still find a way for you to evaluate this algorithm. Typically we would either send you a demo SoundCheck license, or you would send either your speakers or recorded waveforms to us for evaluation. Please contact your local sales engineer or email sales@listeninc.com do discuss your options.

Buy It

Ready to get your hands on it? For a limited period of time we are offering deep discounts on Soundcheck upgrades, so it might be cheaper than you think. Check our our promotional ‘new release’ pricing here and request a quote! Please contact sales@listeninc.com for new system pricing.

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