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  2. Auditory masking - Wikipedia

    en.wikipedia.org/wiki/Auditory_masking

    This individual coding only occurs if the frequency components are different enough in frequency, otherwise they are in the same critical band and are coded at the same place and are perceived as one sound instead of two. [3] The filters that distinguish one sound from another are called auditory filters, listening channels or critical ...

  3. List of combat helmets - Wikipedia

    en.wikipedia.org/wiki/List_of_combat_helmets

    PASGT type helmet Kolpak 2: Russia: Russian Army: Lightweight Helmet (LWH) United States: United States Marine Corps [40] PASGT-style helmet with four-point retention strap system and velcro-attached head pad system. Also used by NZDF since the 2000s. LShZ 1+ Russia 2012 Russian Special Forces, FSB, Syrian Army: M02 Composite Helmet: Finland ...

  4. Combat Vehicle Reconnaissance (Tracked) - Wikipedia

    en.wikipedia.org/wiki/Combat_Vehicle...

    The LEP was carried out on the Scimitar and Sabre reconnaissance vehicles, Spartan APCs, Sultan command post vehicles, Samson recovery vehicles, Samaritan ambulances and the Striker anti-tank vehicle. The major part of this upgrade was the replacement of the Jaguar 4.2-litre petrol engine by a more fuel efficient Cummins BTA 5.9 diesel engine. [11]

  5. FV103 Spartan - Wikipedia

    en.wikipedia.org/wiki/FV103_Spartan

    FV103 Spartan is a tracked armoured personnel carrier.It was developed for the British Army as the APC variant of the Combat Vehicle Reconnaissance (Tracked) family. The vehicle can carry up to seven personnel, including three crew members.

  6. Spartan army - Wikipedia

    en.wikipedia.org/wiki/Spartan_Army

    The two kings would typically lead the full army in battles. Initially, both would go on campaign at the same time, but after the 6th century BC, only one would do so, with the other remaining in Sparta. [6] Unlike other polis, their authority was severely circumscribed; actual power rested with the five elected ephoroi. [1]

  7. Ancient Greek military personal equipment - Wikipedia

    en.wikipedia.org/wiki/Ancient_Greek_military...

    The earliest standard hoplite helmet was the Corinthian helmet, developed around 600BC. [12] Later, this was replaced by the Phrygian helmet and Chalcidian helmet, which were lighter and did not impair the wearer's vision or hearing so severely. Helmets often had a horsehair crest, for decorative purposes and as an additional level of protection.

  8. Hearables - Wikipedia

    en.wikipedia.org/wiki/Hearables

    One was the removal of the 3.5mm audio jack from the iPhone, which was denigrated by many. However, it fundamentally changed the dynamics of the market for wireless headphones. Two additional announcements were a new wireless chip allowing them to enter the world of hearables by launching their own brand of earbuds, known as Airpods.

  9. Hearing protection device - Wikipedia

    en.wikipedia.org/wiki/Hearing_protection_device

    Earmuff HPDs typically consist of two ear cups and a head band. Ear cups are usually lined with a sound-absorbing material, such as foam. The cups should be fit so that the center of the ear canal aligns with the ear canal opening. [1] The soft cushions seal around the pinna of the ears. The head band, centered at the top of the head, applies ...