Resolver

EN: Resolver

Cinematografie

A device that governs the speed of a tape recorder during the transfer to mag, insuring the sound will be in sync with picture. The resolver uses the pilottone as a reference for adjusting the playback speed, hence something can only be resolved if it has been recorded with a properly equipped tape recorder. The Nagra IV has a built-in resolver.
The Pollio Folio - Glossary of Cinematography Terms