When the voice
becomes evidence.
Independent expert reports for courts, public authorities and businesses.
How we can help
Questions we address
Do the recordings feature the same speaker?
We systematically compare speech recordings and assess whether their vocal and linguistic features are more consistent with the same speaker or with different speakers.
Learn more about speaker comparison →What can be said about the speaker?
We assess features such as perceived age, accent and regional background, providing indications of characteristics of the unknown speaker.
Learn more about speaker profiling →What was said?
We transcribe difficult-to-understand recordings and clearly mark passages where the wording is uncertain.
Learn more about transcription →Speaker comparison Do the recordings feature the same speaker?
We systematically compare speech recordings and assess whether their vocal and linguistic features are more consistent with the same speaker or with different speakers.
Learn more about speaker comparison →Speaker profiling What can be said about the speaker?
We assess features such as perceived age, accent and regional background, providing indications of characteristics of the unknown speaker.
Learn more about speaker profiling →Transcription What was said?
We transcribe difficult-to-understand recordings and clearly mark passages where the wording is uncertain.
Learn more about transcription →Our process
From initial enquiry
to expert report.
Initial enquiry
We discuss your case and the available options.
Recordings
We explain how to transfer your recordings to us securely.
Assessment
You receive an estimate of the turnaround time and cost.
Expert report
We analyse the recordings and provide a clear, well-reasoned expert report.
Our quality standards
What you can
rely on.
Independent review
Every key analytical step is independently checked by both experts.
Clarity
The expert report is written so that the findings can be understood by non-specialists.
Objective assessment
The conclusions are based solely on the vocal and linguistic characteristics of the recording.
Scientific standards
Our expert reports follow established methods in forensic speaker recognition.
Our process
From initial enquiry to expert report.
Initial enquiry
We discuss your case and the available options.
Recordings
We explain how to transfer your recordings to us securely.
Assessment
You receive an estimate of the turnaround time and cost.
Expert report
We analyse the recordings and provide a clear, well-reasoned expert report.
Our quality standards
What you can rely on.
Independent review
Every key analytical step is independently checked by both experts.
Clarity
The expert report is written so that the findings can be understood by non-specialists.
Objective assessment
The conclusions are based solely on the vocal and linguistic characteristics of the recording.
Scientific standards
Our expert reports follow established methods in forensic speaker recognition.
Who we are
Two experts.
One shared standard.
Our expert reports combine professional experience, scientific methodology and careful collaboration.
Dr Katharina Klug
I studied Speech Science in Halle (Saale), Germany, and Forensic Speech Science at the University of York, where I completed my PhD on voice quality. I worked in various roles in forensic speaker recognition for the German Federal Criminal Police Office (Bundeskriminalamt).
Learn more
My personal definition of meaningful work
The most interesting questions arise where two things are true at the same time. Voices change – yet they remain individual. Experience is essential – and needs scientific evidence. Every case is unique – and still has to be assessed against the same scientific standards.
That is what makes forensic speech science such a fascinating field. It rarely allows simple answers, instead requiring careful evaluation. Which features truly distinguish one speaker from another? Which scientific findings are relevant to the question at hand? And what conclusions can legitimately be drawn for a particular case?
With every new study, our understanding of speech and voice continues to evolve. Research refines existing methods, opens new perspectives and helps us interpret observations more reliably. Research and casework therefore do not exist separately – they complement one another.
That connection is what has kept forensic speech science endlessly fascinating to me.
Kjartan Beier
I studied Linguistics with a specialisation in Dialectology and Speech Science with a specialisation in Forensic Speech Science at the University of Marburg. I then worked for several years as a forensic speaker comparison expert at the Bavarian State Criminal Police Office (Bayerisches Landeskriminalamt).
Learn more
The simplest sentences are often the hardest to write.
During my training as a forensic speech expert, my perspective on technical writing changed fundamentally. Today, I am interested not only in the analyses themselves, but also in how findings and conclusions can be communicated in a way that is easy to follow. The more complex a subject becomes, the more important it is to explain it clearly without oversimplifying it.
For me, this is an ongoing process of learning. With every report, I continue to refine the way I express ideas and remove anything that does not contribute to understanding. My goal remains the same: to communicate technical accuracy clearly, without oversimplifying it.
Questions, answers and
how to get in touch
Clear answers at a glance.
How long does an expert report take?
Most reports are completed within three to six weeks. Smaller assignments can often be completed sooner.
Can you analyse recordings in other languages?
Yes. Vocal characteristics can also be analysed in recordings of other languages. Depending on the case, we work together with qualified language specialists.
Do you follow recognised professional standards?
Yes. We adhere to the Code of Practice of the International Association for Forensic Phonetics & Acoustics and apply scientifically established methods.
How long does an expert report take?
Most reports are completed within three to six weeks. Smaller assignments can often be completed sooner.
Can you analyse recordings in other languages?
Yes. Vocal characteristics can also be analysed in recordings of other languages. Depending on the case, we work together with qualified language specialists.
Do you follow recognised professional standards?
Yes. We adhere to the Code of Practice of the International Association for Forensic Phonetics & Acoustics and apply scientifically established methods.
Contact
Tell us about
your case.
Send us an email or give us a call. Together we will discuss your case, outline the next steps and explain how to transfer your recordings securely.
We will give you an honest assessment of whether a forensic phonetic examination is appropriate for your case.