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  2. Tellabs - Wikipedia

    en.wikipedia.org/wiki/Tellabs

    In September 1981, Tellabs introduced the industry's first echo canceller, an advance over the original echo suppressors that synthesized an echo and electronically subtracted it. By 1990, Tellabs had grown to 2,000 employees at 25 locations globally and sales of $211 million.

  3. Echo suppression and cancellation - Wikipedia

    en.wikipedia.org/wiki/Echo_suppression_and...

    The performance of an echo canceller is measured in echo return loss enhancement (ERLE), [3] [9] which is the amount of additional signal loss applied by the echo canceller. Most echo cancellers are able to apply 18 to 35 dB ERLE. The total signal loss of the echo (ACOM) is the sum of the ERL and ERLE. [9] [10]

  4. Adaptive feedback cancellation - Wikipedia

    en.wikipedia.org/wiki/Adaptive_feedback_cancellation

    Sub-band feedback cancellation is a type of adaptive feedback cancellation that relies less on computations and algorithms, but rather uses the signals already in the device to optimize the feedback cancellation. Sub-band feedback cancellations purpose is to make adaptive feedback cancellation cheaper and more widespread. [8]

  5. 2 Positive Signs for Tellabs - AOL

    www.aol.com/2011/09/17/2-positive-signs-for-tellabs

    Tellabs (NAS: TLAB) carries $291.7 million of goodwill and other intangibles on its balance sheet. Sometimes goodwill, especially when it's excessive, can foreshadow problems down the road. Could ...

  6. What Tellabs Does With Its Cash - AOL

    www.aol.com/2012/05/21/what-tellabs-does-with...

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  7. Tellabs CFO Resigns - AOL

    www.aol.com/news/2013-05-20-news-tellabs-cfo...

    Naperville, Ill.-based Tellabs needs a new CFO. In a vain attempt to avoid tanking its stock price, Tellabs announced Monday that company Executive Vice President and Chief Financial Officer ...

  8. Echo canceller - Wikipedia

    en.wikipedia.org/?title=Echo_canceller&redirect=no

    Language links are at the top of the page across from the title.

  9. Adaptive noise cancelling - Wikipedia

    en.wikipedia.org/wiki/Adaptive_noise_cancelling

    Adaptive noise cancelling is a signal processing technique that is highly effective in suppressing additive interference or noise corrupting a received target signal at the main or primary sensor in certain common situations where the interference is known and is accessible but unavoidable and where the target signal and the interference are unrelated, that is, uncorrelated [1] [2] [3].