Take a look at this.
https://audiosensibility.com/faq/TechnologyOverviewSlideshow.pdf
The whole thing is worth a read, but scroll down to p. 9 for the shortlist of companies that actually match your criterion.
https://audiosensibility.com/faq/TechnologyOverviewSlideshow.pdf
The whole thing is worth a read, but scroll down to p. 9 for the shortlist of companies that actually match your criterion.