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Dual-tone multi-frequency signaling ( DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. [1] DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use ...
About. The Touch-Tone Terrorists are actually one man, Pete Dzoghi, [1] who also goes by the name RePete. He purchased a series of 1-800 numbers, including ones that were one digit different from actual customer service numbers for companies such as (apparently) UPS, an oil change business, an auto insurance "claims support line", a psychic ...
CEFCU. CEFCU may refer to: Caltech Employees Federal Credit Union (1950), La Cañada Flintridge, California. Citizens Equity First Credit Union (1937), Peoria, Illinois — also operates in California; formerly Caterpillar Employees' Credit Union (CECU), then Construction Equipment Federal Credit Union (CEFCU) CEFCU Stadium, sports venue on the ...
DTMF keypad layout. Introduced to the public in 1963 by AT&T, Touch-Tone dialing greatly shortened the time of initiating a telephone call.It also enabled direct signaling from a telephone across the long-distance network using audio-frequency tones, which was impossible with the rotary dials that generated digital direct current pulses that had to be decoded by the local central office.
The NEC μPD77C25, which succeeded the μPD7720, runs at 8 MHz frequency with 256-word 16-bit data RAM, 1,024-word 16-bit data ROM, and 2,048-word 24-bit program memory. [13] The stack, utilized during subroutine calls and interrupts, maintains the same depth of four as that of the μPD7720. [13]
Multifrequency signaling is a technological precursor of dual-tone multi-frequency signaling (DTMF, Touch-Tone ), which uses the same fundamental principle, but was used primarily for signaling address information and control signals from a user's telephone to the wire-center's Class-5 switch. DTMF uses a total of eight frequencies.
Pöschl–Teller potential. In mathematical physics, a Pöschl–Teller potential, named after the physicists Herta Pöschl [1] (credited as G. Pöschl) and Edward Teller, is a special class of potentials for which the one-dimensional Schrödinger equation can be solved in terms of special functions .