Hitachi D-E75 High-Com Cassette Deck

This Hitachi D-E75 High-Com is a stereo cassette deck with High-Com noise reduction, it was first sold by Hitachi in 1981.

The main features of the Hitachi D-E75 High-Com cassette deck are: 2 heads, tape type selection and capable of handling normal tapes.

The High Com system (as used in the Hitachi D-E75 High-Com) works as a broadband 2:1:2 compander, achieving almost 15 dB of noise reduction for low and up to 20 dB for higher frequencies, while avoiding most of the acoustic problems observed with other high compression broadband companders. The 19kHz multiplex pilot slgnal present in FM stereo broadcasts can cause false triggering of the noise reduction system. The switchable MPX filter of the D-E75 High-Com filters out the pilot signal, and assuring proper Dolby processing of FM stereo programs.