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Posted by / 13-Apr-2020 05:36

Telephone dating services numbers

In push-button dialing, introduced in the 1960s, the pressing of each button generates a “dual-tone” signal that is specific to the number being entered.Each dual tone is composed of a low frequency (697, 770, 852, or 941 hertz) and a high frequency (1,209, 1,336, or 1,477 hertz), which are sensed and decoded at the switching office.The return rotation causes a switch to open and close, producing interruptions, or pulses, in the flow of direct current to the switching office.Each pulse lasts approximately one-tenth of a second; the number of pulses signals the number being dialed.

Ringers are of two types, mechanical or electronic.Within 20 years of the 1876 Bell patent, the telephone instrument, as modified by Thomas Watson, Emil Berliner, Thomas Edison, and others, acquired a functional design that has not changed fundamentally in more than a century.Since the invention of the transistor in 1947, metal wiring and other heavy hardware have been replaced by lightweight and compact microcircuitry.The base unit is powered by a transformer connection to a standard electric outlet.The switch hook connects the telephone instrument to the direct current supplied through the local loop.

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Unlike the low-frequency rotary pulses, dual tones can travel through the telephone system, so that push-button telephones can be used to activate automated functions at the other end of the line.

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