Audio processing with modified convolution

A method of processing a digital signal, said method comprising the steps of:

• providing another digital signal including a plurality of neighbouring sample points;
• performing a sample rate increase on the other digital signal to provide a plurality of intermediate sample points between adjacent of the neighbouring sample points, said intermediate points being populated dependent on a weighted influence determined in the time domain of a predetermined number of the neighbouring sample points;
• applying the other signal to the signal where:
• i) one of the neighbouring sample points of the other signal is applied to a corresponding sample point of the signal;
• ii) offset and neighbouring sample points of the signal are defined either side of the corresponding sample point of the signal, said offset points being offset in the time domain relative to the respective neighbouring sample points of the other signal;
• and
• iii) the other of the neighbouring sample points of the other signal are each applied to respective of the offset and neighbouring sample points of the signal.

A non-transitory computer or device-readable medium including instructions for processing a digital signal or filter, said instructions when executed by a processor cause said processor to:

• provide a digital filter or signal including a plurality of neighbouring sample points;
• perform a sample rate increase on the digital filter or signal to provide a plurality of intermediate sample points between adjacent of the neighbouring sample points, said intermediate points being populated dependent on a weighted influence determined in the time domain of a predetermined number of the neighbouring sample points;
• apply the digital filter to the signal or vice versa where
• i) one of the neighbouring sample points of the filter or signal is applied to a corresponding sample point of the signal or filter, respectively;
• ii) offset and neighbouring sample points of the signal or filter are defined either side of the corresponding sample point of the signal or filter, said offset points being offset in the time domain relative to the respective neighbouring sample points of the filter or signal;
• and
• iii) the neighbouring sample points of the filter or signal are applied to respective of the offset and neighbouring sample points of the signal or filter, respectively.