| 摘要 |
PURPOSE:To improve greatly the code error factor by equalizing selectively the wave to be interfered and making use of a fact that a waveform having large interference between codes and a normal waveform within the original allowable value are mixed into a time variance component in terms of time. CONSTITUTION:Waveform compensating circuits 2 and 4 use transversal filters containing delay lines 6 and 7 or 17 and 18, attenuators 8 and 9 or 19 and 20, and an adder 10 or 21. The amount of compensation of the frequency characteristics is decided from the amounts of delay and addition. An amplitude controller 3 consists of buffer amplifiers 12 and 13, diodes 14 and 15, and attenuators 11 and 16. A variable attenuator 11 controls the amplitude applied to a pair of diodes, and therefore the threshold level can be set freely. For instance, the output voltage of the amplifier 12 is set at 2V and therefore it is possible to give compensation to a signal having the total reduction of amplitude by 6dB as long as a Schottky diode is used. As a result, the code error factor can be greatly improved. |
