Method of Recognizing Telephone Signal Tone Using Single Chip Microcomputer

frozenviolet

Method of Recognizing Telephone Signal Tone Using Single Chip Microcomputer [Copy link]

This paper introduces a method of using a single chip microcomputer to identify telephone signal tones, which is low in cost, high in reliability and strong in adaptability. When the signal tone
frequency deviates greatly from 450 Hz or there is interference on the line, it can still correctly identify
the states of silence (line failure), dial tone, busy tone, unavailable tone, congestion tone, ringback tone, and the called user picking up the phone.

jdjwj

Has the moderator verified this method?

fengzhang2002

Is this reliable? Reliability saves money. We are currently using MT8888 to process it.

jjkwz

Have you debugged and verified it yourself? Is it useful?