|  | H |
SECTION H — ELECTRICITY

|  | H04 |
ELECTRIC COMMUNICATION TECHNIQUE

|  | H04S |
STEREOPHONIC SYSTEMS (information storage on discs or tapes Fulltext... Hierarchy... Expanded...G11B; broadcast systems for the distribution of stereophonic information Fulltext... Hierarchy... Expanded...H04H 5/00; multiplex systems in general Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...H04S 5/00, Fulltext... Hierarchy... Expanded...H04S 7/00 take precedence) [3]

|  | H04S 3/00 |
Systems employing more than two channels, e.g. quadraphonic (Fulltext... Hierarchy... Expanded...H04S 5/00, Fulltext... Hierarchy... Expanded...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]