Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1984-12-07
1987-06-23
Rubinson, Gene Z.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379356, 379386, H04M 150
Patent
active
046758984
ABSTRACT:
A single-tone receiver for a device which only needs simple data which can be encoded in the seven or eight single tones which can be generated by an ordinary pushbutton telephone is provided. A telephone line interface circuit receives a signal from the telephone line. The input signal is not filtered to separate the high-frequency tones from the low-frequency tones prior to their detection. A zero crossing detector coupled to the telephone line interface detects zero crossings of a received single-tone input signal. A microprocessor coupled to the zero crossing detector counts the number of zero crossings in a period and compares the count to counts corresponding to each of the seven single-tone frequencies.
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IBM Tech. Disclosure Bulletin, "Telephone Call Progress Detection Method", Oct. 1985, vol. 28, No. 5, pp. 1864-1865.
Buscom Systems Inc.
Connors M.
Rubinson Gene Z.
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