Patent ID: 8204240
Filing Date: 2012-06-19
Classification: H04S

Abstract:
1. An apparatus for artificial reverberation comprising: an input signal port and an output signal port; and a value of N−1 input summing nodes where N represents an integer value of 2 or greater, each of said input summing nodes having one or more input summing node inputs and an input summing node output substantially representing the sum of said input summing node inputs; and said input signal port fed into one or more of said input summing node inputs; and a value of N−1 input filters and a value of N−1 input delay elements, each of said input delay elements representing a digital delay and having one or more input delay times; and said input filter and said input delay element arranged in a first series combination thereby forming N−1 first series combinations; and each of said first series combination having a first combination input and a first combination output, said first combination input fed by one of said summing node outputs; and each of said first series combination outputs fed into a summing amplifier having one or more inputs; and said summing amplifier having an output fed back into each of said input summing nodes; and N−1 first minor loop feedback attenuators; and said first series combination output negatively fed back through said first minor loop feedback attenuator into said input summing node which directly fed said first series combination if said summing amplifier output is positively fed back into said input summing nodes or said first series combination output positively fed back through said first minor loop feedback attenuator into said input summing node which directly fed said first series combination if said summing amplifier output is negatively fed back into said input summing nodes; and a feedback summing node, said feedback summing node having one or more feedback summing node inputs and a feedback summing node output substantially representing the sum of said feedback summing node inputs; and said summing amplifier output fed into one or more of said feedback summing node inputs; and said feedback summing node having no feed from said input signal port; and a feedback filter and a feedback delay element, said feedback delay element having one or more feedback delay times; and said feedback filter and said feedback delay element arranged in a second series combination thereby forming one or more second series combinations; and said second series combination having a second combination input and a second combination output, said second combination input fed by said feedback summing node output; and said second series combination output fed into one or more of said inputs of said summing amplifier; and said second series combination output negatively fed back through a second minor loop feedback attenuator into said feedback summing node input if said first series combination output is negatively fed back through said first minor loop feedback attenuator or positively fed back through said second minor loop feedback attenuator into said feedback summing node input if said first series combination output is positively fed back through said first minor loop feedback attenuator; and said second combination output fed to said output signal port representing an output signal whereby an artificial reverberation is reflected in said output signal relative to an input signal without a spurious echo.