IPC 7 English version H04S !A-H04S 7/00

H04S-H04S00700

SECTION H – ELECTRICITY

H 04

ELECTRIC COMMUNICATION TECHNIQUE

H 04 S

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]

Note

In this subclass, the following expression is used with the meaning indicated:

–

"stereophonic systems" covers quadraphonic or similar systems. [3]

Two-channel systems (H04S 5/00, H04S 7/00 take precedence) [3]

Systems employing more than two channels, e.g. quadraphonic (H04S 5/00, H04S 7/00 take precedence) [3]

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]

Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation (arrangements for producing a reverberation or echo sound G10K 15/08) [3]

of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals [3]

Indicating arrangements; Control arrangements, e.g. balance control [3]