H
SECTION H — ELECTRICITY
 H04
ELECTRIC COMMUNICATION TECHNIQUE
 H04S
STEREOPHONIC SYSTEMS (information storage on discs or tapes G11B; broadcast systems for the distribution of stereophonic information H04H 5/00; multiplex systems in general H04J)  [3]
 H04S

Note(s)

In this sub-class, the term "stereophonic systems" covers quadraphonic or similar systems. [3]

 H04S 1/00
Two-channel systems (H04S 5/00, H04S 7/00 take precedence)  [3]
 H04S 3/00
Systems employing more than two channels, e.g. quadraphonic (H04S 5/00, H04S 7/00 take precedence)  [3]
 H04S 3/02
·  of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other  [3]
 H04S 5/00
Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation  [3]
 H04S 5/02
·  of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals  [3]
 H04S 7/00
Indicating arrangements; Control arrangements, e.g. balance control  [3]