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  2. White van speaker scam - Wikipedia

    en.wikipedia.org/wiki/White_van_speaker_scam

    The white van speaker scam is a scam sales technique in which a con artist makes a buyer believe they are getting a good price on home entertainment products. Often a con artist will buy inexpensive, generic speakers [1] and convince potential buyers that they are premium products worth hundreds or thousands of dollars, offering them for sale at a price that the buyer thinks is heavily ...

  3. List of scams - Wikipedia

    en.wikipedia.org/wiki/List_of_scams

    Scams and confidence tricks are difficult to classify, because they change often and often contain elements of more than one type. Throughout this list, the perpetrator of the confidence trick is called the "con artist" or simply "artist", and the intended victim is the "mark".

  4. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    Active noise control (ANC), also known as noise cancellation (NC), or active noise reduction (ANR), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...

  5. Health effects from noise - Wikipedia

    en.wikipedia.org/wiki/Health_effects_from_noise

    Elevated workplace or environmental noise can cause hearing impairment, tinnitus, hypertension, ischemic heart disease, annoyance, and sleep disturbance. [3][4] Changes in the immune system and birth defects have been also attributed to noise exposure. [5] Although age-related health effects (presbycusis) occur naturally with age, [6] in many ...

  6. Echo suppression and cancellation - Wikipedia

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

    Echo suppression and echo cancellation are methods used in telephony to improve voice quality by preventing echo from being created or removing it after it is already present. In addition to improving subjective audio quality, echo suppression increases the capacity achieved through silence suppression by preventing echo from traveling across a ...

  7. Protect yourself from internet scams - AOL Help

    help.aol.com/articles/protect-yourself-from...

    Phishing scams happen when you receive an email that looks like it came from a company you trust (like AOL), but is ultimately from a hacker trying to get your information. All legitimate AOL Mail will be marked as either Certified Mail , if its an official marketing email, or Official Mail , if it's an important account email.

  8. Noise-cancelling headphones - Wikipedia

    en.wikipedia.org/wiki/Noise-cancelling_headphones

    Noise-cancelling headphones are headphones that suppress unwanted ambient sounds using active noise control (ANC). Active noise cancellation makes it possible to listen to audio content without raising the volume excessively. In an aviation environment, noise-cancelling headphones increase the signal-to-noise ratio significantly more than ...

  9. Technical support scam - Wikipedia

    en.wikipedia.org/wiki/Technical_support_scam

    Technical support scams rely on social engineering to persuade victims that their device is infected with malware. [15] [16] Scammers use a variety of confidence tricks to persuade the victim to install remote desktop software, with which the scammer can then take control of the victim's computer.

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