Title:
DATA TRANSMISSION/RECEPTION EQUIPMENT
Document Type and Number:
Japanese Patent JP3161146
Kind Code:
B2
Abstract:
PURPOSE: To securely transmit data even if a strong interruption component is added and to eliminate the delay unit of a wide band by providing a band pass means fetching only the signal component of a partial band in the band of a spread spectrum signal for a reception device.
CONSTITUTION: The spread spectrum signal (a) (t) passing through a transmission line is inputted to the reception device 20 and converted into the frequency band with a difference from a local oscillation signal being the output of a local oscillator 213 by the frequency mixer 212 of the band pass means 21. The signal (a) (t) with its frequency converted is restricted in band in a band pass filter 211, only a part of the frequency component is fetched and outputted as an intermediate signal (b) (t). A reception state judgement means 24 inputs detection output (c) (t) and decoding data d'm' and transmits a band switching signal when data is not in a satisfactory reception state. The local oscillator 213 switches the frequency of the local oscillation signal and sequentially switches the pass band when the band pass switching signal is received.
Inventors:
Hitoshi Takai
Yoshio Urabe
Mountain Saki Hidetoshi
Yoshio Urabe
Mountain Saki Hidetoshi
Application Number:
JP8961493A
Publication Date:
April 25, 2001
Filing Date:
April 16, 1993
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H04B1/707; H04B1/69; H04B1/7097; H04J13/00; (IPC1-7): H04B1/707
Domestic Patent References:
| JP392029A | ||||
| JP4150331A | ||||
| JP4256238A | ||||
| JP4270523A | ||||
| JP396137A | ||||
| JP6197090A |
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)