Fluctuation generator for use in electronic musical instrument

A fluctuation generator for use in an electronic musical instrument comprising:

• memory means for storing a first random number for selecting one of multiple functions;
• uniform random generating means for generating a second random number comprising a sequence of multiple bits having a uniform probability distribution over a predetermined interval;
• and
• a function circuit for receiving said first random number from said memory means and said second random number from said uniform random generating means, and altering the probability distribution thereof to produce a third random number having a probability distribution according to one function of a plurality of functions selected in response to said random number output from said memory means, whereby a tone signal is processed with the third random number to produce a fluctuation in accordance with said third random number.

A fluctuation generator for use in an electronic musical instrument comprising;

• N (N:
• an arbitrary integer) memory means connected in a series-shiftable manner for storing random numbers for selecting one of multiple functions;
• uniform random generating means for generating a first random number comprising a sequence of multiple bits having a uniform probability distribution over a predetermined interval;
• and
• a function circuit for receiving N random numbers from said N memory means and said first random number from said uniform random generating means, and altering the probability distribution thereof to produce a second random number having a probability distribution according to said one function selected by said random numbers output from said N memory means, whereby a tone signal is processed to have function in accordance with said second random number from said function circuit.

A fluctuation generator comprising:

• means for generating a first random number comprising a sequence of multiple bits having a uniform probability distribution over a predetermined interval;
• means for altering the probability distribution of the first random number according to a predetermined function for producing a second random number;
• and
• means for processing a tone signal with the second random number to produce a fluctuation in the tone signal in accordance with the second random number.

A fluctuation generator comprising:

• means for generating a first random number comprising a sequence of multiple bits having a uniform probability distribution over a predetermined interval;
• means for altering the probability function of the first random number to produce a second random number having a probability distribution according to a predetermined function, the means for altering comprising means for storing a previously produced second random number and means for producing a second random number in response to the first random number and the stored previously produced second random number;
• and
• means for processing a tone signal with the second random number to produce a fluctuation in the tone signal in accordance with the second random number of a predetermined two bits as a shift input.