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...nufacturer of building materials. It is designed to provide high levels of sound attenuation between rooms. It was introduced in 2003. ...uses a damping technique called [[constrained-layer damping]] (CLD). This technology had been used for at least 20 years to reduce [[vibration]]s in mechanical

[[Image:MauritiusCommandAudioBookCassette.JPG|thumb|An audio cassette recording]] ...ok''' is a recording that is primarily spoken word. It is often based on a recording of commercial printed material. It is not necessarily an exact audio versio

...lly possible to use a mechanical design to filter mechanical vibrations or sound waves (which are also essentially mechanical) directly. For example, filter ...ed to precisely the same frequency, which would only vibrate and produce a sound from transmissions by the operator with the identical tuning.<ref name=Lund

...pecial oscilloscopes have borrowed from [[Image intensifier|night vision]] technology, employing a microchannel plate electron multiplier behind the tube face to ...gh a CRO allows one to view a signal, in its basic form it has no means of recording that signal on paper for the purpose of documentation. Therefore, special o