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Universal Tone Transmitter/Receiver Module Disclosure Number: IPCOM000064539D
Original Publication Date: 1985-Jul-01
Included in the Prior Art Database: 2005-Feb-19

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Graham, AD Nguyen, PD Rettew, JH Troop, WC [+details]


This article describes a universal tone receiver/transmitter module which provides a telephone switching system with one module for all tone signaling. The application of all digital technology offers many advantages over present methods of telephony-oriented tone generation and detection. Adaptation to a telephone company (telco) tone plan anywhere in the world requires no physical or electrical adjustments, as the CPU can be programmed to update the tone plan parameters. Each tone plan may also have many subsets of tones. For example, in the USA, tone subsets include the dual-tone multi-frequency (DTMF) plan, the multi- frequency (MF) plan, and the progress tone plan. Other countries have their own unique tone plans.