technoguy

Dolby Analog SR or Dolby SR format (Spectral Recording), was developed by Dolby Laboratories and has been in common use in professional audio since 1986. It is a revised version of Dolby's earlier models, combining aspects of Dolby A, B and C (e.g. sliding band and fixed band companders) to improve the dynamic range (i.e. the range in deciBels between peak level and noise floor) of analogue recordings and transmissions by as much as 25 dB.