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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...

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Updated: Nov 18, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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Publisher Correction: An Information Theory-Inspired Strategy for Design of Re-programmable Encrypted Graphene-based

Ali Momeni^1,2, Kasra Rouhi^1,2, Hamid Rajabalipanah^1,2

¹Department of Electrical Engineering, Iran University of Science and Technology, Tehran, 1684613114, Iran.

Scientific Reports

|February 4, 2021

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