Analysing voices, speech and audio recordings for investigations and forensic cases

J P French Associates is the country’s longest established independent forensic speech and acoustics laboratory.  We are experts in forensic voice analysis, transcription, authentication and audio enhancement, as well as providing a number of other forensic speech and audio services.  Our experience in producing reports and giving evidence is unrivalled in the UK.  In criminal cases, we work for both prosecution and defence.  We also provide advice and training services to law enforcement agencies and lawyers across the world.

ENF compares National Grid fluctuations to the mains hum in forensic recordings

Electrical Network Frequency (ENF)

We are the only independent forensic laboratory in the UK to hold a database of fluctuations in the national power supply.  This data is compared with residual low-level mains hum in recordings to determine the date and time a recording was made and to detect editing.

We are now using this new technique in cases to authenticate digital recordings.