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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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Microcomputer applications for hearing aid selection and fitting

¹Professor of Audiology, Central Missouri State University, Warrensburg, MO 64093.

Trends in Amplification

|November 27, 2014

Summary

No abstract available in PubMed .

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