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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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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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In-fiber duplex optical antenna and its programmable spectral filter application: publisher's note.

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Summary

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Last Updated: Jul 29, 2025

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Published on: January 7, 2019

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Area of Science:

Optics and Photonics

Background:

A previous publication contained errors.

Purpose of the Study:

To provide necessary corrections to a published article.

Main Methods:

A review of the original publication and identification of errors.

Main Results:

Specific corrections have been identified and are detailed.

Conclusions:

The corrected information ensures the accuracy of the scientific record.