| 摘要 |
PROBLEM TO BE SOLVED: To provide a spread spectrum communication equipment capable of easily obtaining the level of received spread signals spectrum-spread by a spreading code and thereby limiting the level of narrow band interference waves provided in the spread signals. SOLUTION: From a part of the received spread signals, the level of the spread signals is detected in the magnetostatic wave filter 3a of a narrow band capable of changing frequency pass band and a level comparator circuit 3d, it is fed back to a variable amplification amplifier 4a and signals above a fixed level provided with the narrow band interference waves of the frequency band of the spread signals are limited in the magnetosatatic wave filter 4c. Thus, the need of providing many band-pass filters of the narrow band for the detection of the level of the narrow band interference waves is eliminated, thereby making a spread signal level detection circuit small in size and low in cost. |
