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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: Jun 19, 2026

Bridging the Technology Divide in the COVID-19 Era: Using Virtual Outreach to Expose Middle and High School Students to Imaging Technology

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Enhancing access through TeenScreen

Laurie Flynn¹, Mark Olfson¹

¹College of Physicians and Surgeons, Columbia University and New York State Psychiatric Institute, New York.

Journal of the American Academy of Child and Adolescent Psychiatry

|October 27, 2009

Summary

No abstract available in PubMed .

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