Title:
FREQUENCY CONVERTER FOR TWO-WAY CATV SYSTEM AND IN-HOUSE TRANSMISSION SYSTEM FOR MULTIPLE DWELLING HOUSE
Document Type and Number:
Japanese Patent JP3458360
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a 2-way cable television CATV system for complex housing where noise superimposed on an incoming signal is hardly transmitted.
SOLUTION: A frequency twice that of a pilot signal (frequency 451.25 MHz) sent from a head end is used for a local oscillation signal frequency for an up-converter 20 that converts an incoming signal (10-50 MHz) of a modem 13d into a high frequency by using a frequency converter and a down-converter 10 that converts a high frequency for in-house transmission into a low frequency so as to match an incoming signal band (usually 10-50 MHz) of a CATV main line from in-house transmission in this frequency converter to convert the frequency in the transmission system where a high frequency band (650 MHz or over) with less confluent noise is used for an incoming signal frequency band of an incoming signal in a complex housing building.
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Inventors:
Toshio Kato
Yoshitaka Ikeda
Kunihiko Hirose
Yoshitaka Ikeda
Kunihiko Hirose
Application Number:
JP17532398A
Publication Date:
October 20, 2003
Filing Date:
June 09, 1998
Export Citation:
Assignee:
Kandenko Co., Ltd.
International Classes:
H04N5/00; H04N7/10; H04N21/61; H04N21/647; (IPC1-7): H04N7/10; H04N5/00; H04N5/44; H04N7/173
Domestic Patent References:
| JP6462935A | ||||
| JP4945619A | ||||
| JP983830A | ||||
| JP5654172A | ||||
| JP669837A | ||||
| JP5268605A | ||||
| JP2207689A | ||||
| JP319472A | ||||
| JP9510071A |
Attorney, Agent or Firm:
Shinichi Matsui