• Cutting edge research and technology

  • Unrivalled international experience

  • High quality audio equipment

  • Combined experience of thousands of cases

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.

AHRC grant for ‘Voice and Identity’ research

Staff at J P French Associates are collaborating with academics from the University of York on a major three year project entitled ’Voice and Identity: Source, Filter, Biometric‘ after being awarded funding of £892,000 from the UK Arts and Humanities Research Council (AHRC).  The project will investigate the performance of a range of methods used in forensic speaker comparison.


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.

We provide the following services: Read more about our scientific staff: About J P French Associates
Speaker comparison Professor Peter French Quality
Transcription Dr Philip Harrison Research
Questioned content analysis Asfah Bhagdin Technology
Speaker profiling Dr Christin Kirchhübel International
Earwitness consultation Dr Richard Rhodes Service
Authentication of recordings Dr Jessica Wormald Feedback
Enhancement Staff listing Previous cases
Sound source analysis Contact
 Acoustic reconstruction