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CATV telephone system
| Details |
Inventors: Yashiro, Kenji; Sasada, Tetsuichiro;
Assignee: Pioneer Electronic Corporation (Tokyo-to, JP)
Primary Examiner: Powell; Mark R.
Assistant Examiner: Grand; Chris
Attorney, Agent or Firm: Kane,Dalsimer,Sullivan, Kurucz, Levy, Eisele and Richard, LLP
A CATV telephone system includes a center device and a plurality of terminal devices connected by wired communication lines. The center device receives a request data from the terminal device, examines the frequency bands and the time slots currently occupied, allocates non-busy frequency bands and non-busy time slots to the transmission frequency band, the transmission time slot, the reception frequency band and the reception time slot, and notifies the allocation to the terminal device. Then, the terminal device transmits telephone data to the center device using the transmission frequency band and the transmission time slot designated by the center device, and receives telephone data from the center device using the reception frequency band and the reception time slot designated by the center device. |
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DETAILED DESCRIPTION It is an object of the present invention to provide center device and terminal devices capable of providing the telephone service, like the system using the normal telephone line, utilizing the established CATV system.
According to one aspect of the present invention, there is provided a terminal device for use in a CATV telephone system which includes a center device and a plurality of terminal devices connected by wired communication lines.
The terminal device includes: a unit for transmitting telephone data to the center device using a transmission frequency band and a transmission time slot prescribed for the transmission frequency band which are designated by the center device; and a unit for receiving telephone data from the center device using a reception frequency band and a reception time slot prescribed for the reception frequency band which are designated by the center device.
According to the device thus constructed, the data transmission and the data reception are performed equivalently by time-division multiplexing and frequency-division multiplexing.
Therefore, many channels of telephone communication may be carried out using a relatively narrow frequency band.
According to another aspect of the present invention, there is provided a center device for use in a CATV telephone system which includes a center device and a plurality of terminal devices connected by wired communication lines.
The center device includes: a unit for receiving a request data from the terminal device using a predetermined request transmission frequency band; a unit for examining of the frequency bands and the time slots currently occupied by the communication between the center device and the terminal devices; a unit for designating a transmission frequency band, a transmission time slot prescribed for the transmission frequency band, a reception frequency band and a reception time slot prescribed for the reception frequency band in accordance with a result of the examination by the examining unit; and a unit for transmitting data indicating the transmission frequency band, the transmission time slot, the reception frequency band and the reception time slot designated by the designating unit using a predetermined instruction frequency band
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