© The Institution of Electrical Engineers
An algorithm is presented which enables a microprocessor to analyse the zero intervals of the multifrequency signals from a pushbutton telephone. A model has shown that, with a 100 kHz clock, the component frequencies of any signal can be predicted to within ±1% from a 30 ms sample, but the speech immunity requires improvement.
References
-
-
1)
-
`‘Technical features of pushbutton telephone sets’. CCITT Fifth Plenary Assembly 1972 (Green Book)', , Vol. VI–1 Recommendation Q23.
http://iet.metastore.ingenta.com/content/journals/10.1049/el_19770003
Related content
content/journals/10.1049/el_19770003
pub_keyword,iet_inspecKeyword,pub_concept
6
6