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On the internet, one or more tone indicators may be placed at the end of a message.A tone indicator on the internet often takes the form of a forward slash (/) followed by an abbreviation of a relevant adjective; alternatively, a more detailed textual description (e. g., / friendly, caring about your well-being) may be used.
This signal conditioning may include amplification, filtering, sensor excitation, and input configuration. Another consideration is the frequency range of the instrumentation. It should be large enough to cover the frequency range of signal interest, taking into account the range of the sensor.
The term off-hook has the following meanings: The condition that exists when a telephone or other user instrument is in use, i.e., during dialing or communicating. A general description of one of two possible signaling states at an interface between telecommunications systems, [1] such as tone or no tone and ground connection versus
A group of tell-tales showing lights for "brake fluid", "stop lamp" and "check engine" Graphical tell-talesA tell-tale, sometimes called an idiot light [1] or warning light, is an indicator of malfunction or operation of a system, indicated by a binary (on/off) illuminated light, symbol or text legend.
A tone control circuit is an electronic circuit that consists of a network of filters which modify the signal before it is fed to speakers, headphones or recording devices by way of an amplifier. Tone controls are found on many sound systems: radios , portable music players , boomboxes , public address systems , and musical instrument amplifiers .
An output signal switching device (OSSD) is an electronic device used as part of the safety system of a machine.It provides a coded signal which, when interrupted due to a safety event, signals the machine to shut down.
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A defect detector is a device used on railroads to detect axle and signal problems in passing trains. The detectors are normally integrated into the tracks and often include sensors to detect several different kinds of problems that could occur.