Dtmf tone generator

Until out-of-band signaling equipment was developed in the s, fast, unacknowledged DTMF tone sequences could be heard during the commercial breaks of cable channels in the United States and elsewhere. The engineers had envisioned telephones being used to access computers and automated response systems. Based on this prior success with using MF by specialists to establish long-distance telephone calls , dual-tone multi-frequency signaling was developed for end-user signaling without the assistance of operators. DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in Coaxial cable Fiber-optic communication Optical fiber Free-space optical communication Molecular communication Radio waves Transmission line.

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