Kristofer Kjörling


Kristofer Kjörling
Associated organizations
Dolby Laboratories
Fields of study


Among the leaders of key audio coding technology, Kristofer Kjörling, together with colleagues Martin Dietz and Lars Liljeryd, helped set the standard for high-quality audio compression employed in today’s mobile and digital media devices. Dietz, Kjörling, and Liljeryd developed the concept of spectral band replication for more efficient and natural-sounding perceptual audio coding. Mr. Liljeryd provided the vision of using bandwidth replication to improve existing coding methods; Mr. Kjörling led the research that turned the vision into working prototypes; and Mr. Dietz provided the knowledge and industry connections to bring the technology to market. The trio’s groundbreaking work evolved into the High-Efficiency Advanced Audio Coding method, standardized in 2004, which is a key component of today’s cell phones, mobile media devices, digital radios, televisions, and personal computers. Its efficiency has enabled lower-bitrate audio streaming for wireless applications, reducing storage needs and lowering transmission and streaming costs.

Mr. Kjörling is a principal member of the technical staff with Dolby Laboratories in Stockholm, Sweden.