Method and system for modification of audio signals

A system for modification of audio signals, comprising:

• means for producing audio signals consisting of an input signal defining the point at which the audio signal is received and of a control signal defining the desired change of the signal pitch,
• one or more pickups that changes vibrations of an audio signal into an electrical input signal,
• an analog-to-digital converter for the input signal,
• a memory for storing the digitized input signals, the memory having a data file in such a form that each piece of signal data is placed in a queue having an input pointer that locates the next available storage location and output pointer that locates the next location to read from the queue,
• a digital signal processing processor with
• means for control signal analysis,
• means to run an algorithm for processing the input signals, a digital-to-analog converter for the output signal, and an amplifier to amplify the output signal, the algorithm performing pitch-shifting of the input signal by re-sampling as a function of the control signal and selecting segments of the input signal to be discarded and repeated in order to preserve the signal length, which is changed as a result of the re-sampling,
• means for onset-processing of the input signal in order to find the onset point of the input signal, and
• the algorithm measuring the distance between the input pointer and output pointer for each sample in the input and by transferring the output pointer in the memory in accordance with the measured distance in order to avoid colliding of the pointers at any locations.