Digital data sample rate conversion system with delayed interpolation

A sample rate converter for converting data of a first sample rate to data of a second sample rate, comprising:

• an interpolation network operating at said first sample rate comprising,
• (a) a pre-processor for processing said first sample rate data to provide upsampled data of higher spatial resolution than said first sample rate;
• (b) a delay network for delaying said upsampled data to provide a plurality of delayed upsampled interpolated data samples preceding and succeeding an original sample position;
• and
• a digital filter operating at said second sample rate for filtering said delayed upsampled interpolated data samples to provide said data of said second sample rate.

A method for sample rate conversion of data of a first sample rate data of a different second sample rate, comprising the steps of:

• processing said first sample rate data at said first sample rate by,
• interpolating said first sample rate data to provide upsampled interpolated data samples according to a first sample spacing, and
• delaying said upsampled interpolated data samples to provide delayed upsampled interpolated data samples according to a second sample spacing of higher resolution than said first sample spacing, said delayed upsampled interpolated data samples preceding and succeeding an original sample position;
• and
• filtering said data samples of said higher resolution at said second sample rate to provide said data of said second sample rate.

A method for converting data of a first sample rate to data of a second sample rate, comprising the steps of:

• interpolating said first sample rate data at said first sample rate by,
• pre-processing said first sample rate data to provide upsampled data of higher spatial resolution than said first sample rate;
• delaying and multiplexing said upsampled data to provide a plurality of delayed upsampled interpolated data samples preceding and succeeding an original sample position;
• and
• filtering said delayed upsampled interpolated data samples at said second sample rate to provide said data of said second sample rate.