发明名称 |
COMMUNICATION DEVICE, FREQUENCY SPECTRUM INVERSION CALCULATION METHOD AND PROGRAM STORAGE MEDIUM |
摘要 |
PURPOSE: To provide an inexpensive communication device of a simple constitution which can deal with a communication system of a fixed duplex interval, can easily set the transmitting and receiving frequency and also can attain the duplex calls between slave units. CONSTITUTION: The signals of transmitting frequencies fta and ftb sent from slave units A and B are received at a receiving part 20 and a signal processing part 40 inverts the entire frequency spectrum including the signals received and undergone the frequency conversion at the part 20. Then the received signals included in the frequency spectrum inverted at the part 40 are undergone by the frequency conversion at a transmitting part 30 and retransmitted as the signals of receiving frequencies fra and frb of the units A and B.
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申请公布号 |
KR20010092318(A) |
申请公布日期 |
2001.10.24 |
申请号 |
KR20010013113 |
申请日期 |
2001.03.14 |
申请人 |
SHARP CORPORATION |
发明人 |
SAWA KAZUHIRO;TODA MANABU |
分类号 |
H04M1/725;H04B1/38;H04B1/52;H04B7/15;H04B7/26;H04K1/04;H04Q7/38;(IPC1-7):H04B7/26 |
主分类号 |
H04M1/725 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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