low-frequency dialing
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Dual-tone multi-frequency signaling — One of the few production telephone DTMF keypads with all 16 keys, from an Autovon Telephone. The column of red keys produces the A, B, C, and D DTMF events. Dual tone multi frequency signaling (DTMF) is used for telecommunication signaling over… … Wikipedia
Dual-tone multi-frequency — (DTMF) signaling is used for telephone signaling over the line in the voice frequency band to the call switching center. The version of DTMF used for telephone tone dialing is known by the trademarked term Touch Tone (canceled March 13, 1984),… … Wikipedia
telephone — telephoner, n. /tel euh fohn /, n., v., telephoned, telephoning. n. 1. an apparatus, system, or process for transmission of sound or speech to a distant point, esp. by an electric device. v.t. 2. to speak to or summon (a person) by telephone. 3.… … Universalium
List of electronics topics — Alphabetization has been neglected in some parts of this article (the b section in particular). You can help by editing it. This is a list of communications, computers, electronic circuits, fiberoptics, microelectronics, medical electronics,… … Wikipedia
Hearing aid — Behind the ear aid In the ear aid … Wikipedia
Technology in Stargate — Naqahdah redirects here. For one of the archaeologically identified cultures of Pre Dynastic Egypt, see Naqadan culture. For the town on the west bank of the Nile in Egypt, see Naqada. For other uses, see Naqada (disambiguation). The most… … Wikipedia
Rockdelux — Logo de Rockdelux. Rockdelux est une revue musicale espagnole, spécialisée dans l étude des nouvelles tendances du pop rock alternatif et indépendant et de la musique électronique. Sommaire … Wikipédia en Français
History of radio — The pre history and early history of radio is the history of technology that produced radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio.… … Wikipedia
Telephone keypad — A telephone keypad is a keypad that appears on a “Touch Tone” telephone. It was standardised when the dual tone multi frequency (DTMF) system was introduced in the 1960s, and replaced the rotary dial.The contemporary keypad is laid out in a 3… … Wikipedia
Answer tone — is a feature of wireline modems.The answer tone is the first signal sent by the answering modem after the billing delay. In its most basic form, it is a single continuous tone with a frequency of 2100 Hz (or 2225 Hz for Bell modes). It is the… … Wikipedia
Modem — For other uses, see Modem (disambiguation). A modem (modulator demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The… … Wikipedia
