Digital sampling instrument for digital audio data

A digital sampling instrument operating at a certain sampling frequency for the multichannel interpolative playback of digital audio data stored in a waveform memory comprising:

• coefficient memory means for storing one or more impulse responses,
• linear interpolation means including multiplication means for computing the product of the difference between adjacent points in said coefficient memory means times the least significant portion of a fractional address,
• said linear interpolation means further including addition means for adding said product to one of said points in said coefficient memory means,
• convolution means for computing a sum of products of the contents of said coefficient memory means times the contents of said waveform memory for each of several output channels to form a convolution wherein said convolution means include the same multiplication and addition means as said linear interpolation means, and
• means for outputting the result of said convolution for each of said channels.

A digital sampling instrument for the multi-channel interpolative playback of digital audio data stored in a waveform memory means comprising:

• coefficient memory means for storing several impulse responses,
• said waveform memory means comprising four banks of memory such that adjacent samples are stored n differing banks,
• output multiplexing means for forming a multiplexed output of said four banks of memory such that the output of the highest order bank is output first and so on until the lowest order bank is output last.
• means for selecting an impulse response waveform,
• convolution means for computing a sum of products of the contents of said waveform memory means times said selected impulse response waveform in said coefficient memory means for each of several output channels to form a convolution,
• means for outputting the result of said convolution for each of said channels.

A digital sampling instrument for the multichannel Nth order interpolative playback of digital audio data stored in a waveform memory comprising:

• coefficient memory means for storing several impulse responses,
• cache memory means for storing N waveform memory samples for each channel,
• means for selecting an impulse response waveform,
• convolution means for computing a sum of N products of the contents of said waveform memory times said selected impulse response waveform in said coefficient memory for each of several output channels to form a convolution, and
• means for outputting the result of said convolution for each of said channels.