Patent ID: 6284965
Filing Date: 2001-09-04
Classification: G10H,Y10S

Abstract:
An electronic tone synthesis circuit for synthesizing a tone resembling that produced by a wind instrument having an acoustic tube bore, the circuit comprising:a) an input for receiving an excitation signal;b) a delay for delaying a digital signal;c) an infinite-impulse-response (IIR) filter for digitally filtering the digital signal;d) an output for providing a digital output representing a synthesized tone; ande) a filter truncation circuit for truncating an impulse response of the IIR filter after a predetermined number of samples;wherein:i) the delay and filter are connected in series with feedback to form a filtered delay loop;ii) the input injects the excitation signal into the filtered delay loop;iii) the output extracts the digital signal from the filtered delay loop; andiv) the delay and filter introduce a total time delay of the digital signal, wherein the total time delay is inversely proportional to an approximate pitch of the synthesized tone.