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# Troubleshooting

The following situations can lead to reduced performance in AFP identification.

Low fingerprint rate | When you index a clip into the database, you can view the log file to see the number of fingerprints that have been created from the clip. If the fingerprint rate is too low (given that there is a threshold on fingerprint hit rate during the identification stage) the clip struggles to match. A low fingerprinting rate might be due to the nature of the audio clip being indexed. If the rate is too low, there are several fingerprinting parameters that you can alter to lead to higher rates of fingerprint creation. For information about parameters, see the HPE IDOL Speech Server Reference.
Considerable noise and distortion | Although the algorithm is robust to some amount of noise, the identification rate is likely to suffer if the audio being matched is distorted or has a considerable amount of noise compared to the indexed clip.
Time-warping of audio data | The identification rate is likely to suffer if the audio being matched has dropped samples, or otherwise has a different rate to the original clip (for example, if it has been sped up or slowed down).

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