Generating sample error coefficients
AssigneePsytechnics Limited
InventorsPaul Barrett, Ludovic Maifait
Life of this patent
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Abstract
This invention relates to generation of a sample error coefficient suitable for use in an audio signal quality assessment system. The invention provides a method of determining a sample error coefficient between a first signal and a similar second signal comprising the steps of: determining a first periodicity measure from the first signal; determining a second periodicity measure from the second signal; generating a ratio in dependence upon said first periodicity measure and said second periodicity measure; and determining a sampling rate error coefficient in dependence upon said ratio.
Claims19
A method of determining a sample error coefficient between a first signal and a similar second signal comprising the steps of:
- receiving the second signal via a communications channel, the second signal being a transmitted version of the first signal;
- dividing the first signal into a first plurality of segments;
- dividing the second signal into a second plurality of segments;
- determining a first periodicity measure of one of the first plurality of segments and a second periodicity measure of one of the second plurality of segments;
- determining that the first periodicity measure and the second periodicity measure exhibit similarity which exceeds a similarity threshold;
- determining a third periodicity measure of another of the first plurality of segments and a fourth periodicity measure of one of the second plurality of segments;
- determining that the third periodicity measure and the fourth periodicity measure exhibit similarity which exceeds the similarity threshold;
- generating a first ratio in dependence upon said first periodicity measure and said second periodicity measure and a second ratio in dependence upon said third periodicity measure and said fourth periodicity measure;
- determining a first segment sample rate error coefficient based on the first ratio;
- determining a second segment sample rate error coefficient based on the second ratio;
- and
- determining a sampling rate error coefficient based on both the first and second segment sample rate error coefficients.
A non-transitory computer readable storage medium storing executable computer program instructions for determining a sample error coefficient between a first signal and a similar second signal, the instructions performing steps comprising:
- receiving the second signal via a communications channel, the second signal being a transmitted version of the first signal;
- dividing the first signal into a first plurality of segments;
- dividing the second signal into a second plurality of segments;
- determining a first periodicity measure of one of the first plurality of segments and a second periodicity measure of one of the second plurality of segments;
- determining that the first periodicity measure and the second periodicity measure exhibit similarity which exceeds a similarity threshold;
- determining a third periodicity measure of another of the first plurality of segments and a fourth periodicity measure of one of the second plurality of segments;
- determining that the third periodicity measure and the fourth periodicity measure exhibit similarity which exceeds the similarity threshold;
- generating a first ratio in dependence upon said first periodicity measure and said second periodicity measure and a second ratio in dependence upon said third periodicity measure and said fourth periodicity measure;
- determining a first segment sample rate error coefficient based on the first ratio;
- determining a second segment sample rate error coefficient based on the second ratio;
- and
- determining a sampling rate error coefficient based on both the first and second segment sample rate error coefficients.
Dependencies are inferred from the claim text.