Pseudo noise generator

A pseudo noise generator comprising:

• first terminal means receiving first clock pulses;
• a controller-for generating, in addition to a selection signal, second clock pulses counted down by one forth from said first clock pulses;
• a first arbitrary random number generator for generating, under control with said first clock pulses and said selection signal, two groups of first random number signals respectively corresponding to divided Amplitude Probability Distribitions, which are obtained by dividing a specified Amplitude Probability Distribition into two parts at a specified level;
• a second arbitrary random number generator for generating, under control of said second clock pulses and said selection signal, two groups of second random number signals respectively defined by a specified Pulse Duration Distribution and a specified Pulse Spacing Destribution at said specified level;
• and
• a D/A converter for converting the selected signals to pseudo noise of analog value;
• said pseudo noise being generated in accordance with said Amplitude Probability Distribition, and said specified Pulse Duration Distribution and said specified Pulse Spacing Destribution at said specified level;
• said controller controlling said first arbitrary random number generator by said selection signal to selecting ones of said two groups of first random number signals in accordance with said specified Pulse Duration Distribution and said specified Pulse Spacing Destribution defined at said specified level.