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A crystal earpiece typically consists of a piezoelectric crystal with metal electrodes attached to either side, glued to a conical plastic or metal foil diaphragm, enclosed in a plastic case. The piezoelectric material used in early crystal earphones was Rochelle salt , but modern earphones use barium titanate , or less often quartz .
The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM , UMTS , LTE , 5G NR , iDEN , Iridium or other IMEI-employing wireless ...
Interruptible foldback (IFB), also known as interrupted foldback, interruptible feedback, or interrupt for broadcast, is a monitoring and cueing system used in television, filmmaking, video production, and radio broadcast for one-way communication from the director or assistant director to on-air talent or a remote location.
Many digital cell phones are compatible with TTY devices. [11] [12] Many people want to replace TTY with real-time text over IP (RTT), which can be used on a digital cell phone or tablet without a separate TTY device. [13]
More than the blue light emitted by phones, Pierson noted, "Reading work emails relating to impending deadlines is clearly going to cause anxiety, and anxiety is strongly related to insomnia."
The TSO for aviation headsets is C139, which includes requirements to withstand extreme heat and cold, decompression, and electromagnetic interference. [14] Some commercial airlines require the use of TSO-compliant headsets, as part of their operations manual. [15] This is a choice by the airline, not an FAA requirement. [16]
In 1958, Kupriyanovich made the new experimental "pocket" model of mobile phone. This phone weighed 0.5 kg. To serve more customers, Kupriyanovich proposed the device, which he called "correlator." [11] [12] In 1958, the USSR also started the development of the "Altai" national civil mobile phone service for cars, based on the Soviet MRT-1327 ...
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