Transmission interruption signal detection system

Details Transmission interruption signal detection system Transmission interruption signal detection system

1979-09-07

1985-12-31

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

179 2DP, H04N 132

Patent

active

045624836

ABSTRACT:
In a transmission interruption signal detection system of a facsimile system transmitting image information from transmission apparatus to reception apparatus and producing a transmission interruption signal of a predetermined frequency and sending the same continuously for a predetermined period of time from the reception apparatus to the transmission apparatus when the reception apparatus is hung up, a hybrid transformer apparatus is provided, and transmission of the image information and reception of the transmission interruption signal are performed through the hybrid transformer apparatus, and signals having the predetermined frequency are extracted from signals obtained during transmission of the image information through the hybrid transformer apparatus and when the generation of the extracted signals continues for the predetermined period of time or longer, the transmission interruption detection signal is produced.

REFERENCES:
patent: 3914538 (1975-10-01), Perrault
patent: 4112467 (1978-09-01), Ogawa
patent: 4191855 (1980-03-01), Sakai
Microtran Engineering Application Bulletin F232-6/72, "Telephone Coupling Transformers", c. 1972.

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