Method and apparatus for displaying at a selected station...

Details Method and apparatus for displaying at a selected station... Method and apparatus for displaying at a selected station...

H - Electricity

04

M

344/18, 344/0.5

H04M 3/42 (2006.01) H04M 1/57 (2006.01)

Patent

CA 1225726

- 18 - METHOD AND APPARATUS FOR DISPLAYING AT A SELECTED STATION SPECIAL SERVICE INFORMATION DURING A SILENT INTERVAL BETWEEN RINGING Abstract Method and apparatus is disclosed for displaying special service information at a selected station during a silent interval between ringing. The apparatus, a data receiver, is connected to the tip and ring leads of any well-known station set and comprises a line interface unit, a converter, a control circuit, and a display unit. A frequency shift keyed (FSK) signal which represents the special service information is filtered from the ringing signals by the line interface unit. The converter detects the FSK signal and demodulates the special service information from the FSK signal. Upon detection of the FSK signal, the control circuit receives and stores the special service information. The stored special service information is then periodically sent to the display unit to begin exhibiting the information during the silent interval before the next ringing signal. (FIG. 1)

457421

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