Reverberation tone generating apparatus

A digital reverberation tone generating apparatus having musical tone signals input thereto, comprising:

• memory means having a plurality of memory areas, each of which are used as delay elements, wherein said memory areas comprise a plurality of first memory areas of a first reverberation tone forming unit and a plurality of second memory areas of a second reverberation tone forming unit;
• delay time information generating means for generating delay time information that determines delay times for each of said memory areas used as delay elements;
• memory address generating means for generating write address information for identifying write addresses designating locations of said memory areas to store amplitude samples of musical tone signals respectively at a present time and read address information for identifying read addresses, equal to said write addresses, designating locations of said memory areas to read out said stored amplitude samples after the lapse of the time designated by said delay time information, said memory areas storing and outputting said stored amplitude samples in response to said write address information and read address information respectively;
• coefficient generating means for generating coefficients corresponding to said memory areas respectively;
• calculating means for modifying said stored amplitude samples outputted from said memory areas in accordance with corresponding ones of said coefficients generated from said coefficient generating means;
• program control means including a first program which provides a sequence of generation of said delay time information, said write address information, and said read address information, said memory address generating means and said coefficient generating means generating said delay time information, said read address information, said write address information and said coefficients in accordance with said program, said program control means further including a second program for controlling the coupling of each of said first and second memory areas, wherein said second program couples said first memory areas in parallel and said second memory areas in series and wherein said second program also forms a feedback loop for each of said memory areas of said first and second memory areas;
• and
• reverberation tone producing means for producing a reverberation tone in accordance with said stored amplitude samples of musical tone signals modified by said calculating means.