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| SECTION H– ELECTRICITY |
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| H 04 | ELECTRIC COMMUNICATION TECHNIQUE |
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| H 04 S | STEREOPHONIC SYSTEMS (information storage on discs or tapes G 11 B; broadcast systems for the distribution of stereophonic information H 04 H 5/00; multiplex systems in general H 04 J) |
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| Note |
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| In this subclass, the following expression is used with the meaning indicated: |
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| – | "stereophonic systems" covers quadraphonic or similar systems. [3] |
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1/ | 00 | Two-channel systems (H 04 S 5/00, H 04 S 7/00 take precedence) |
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3/ | 00 | Systems employing more than two channels, e.g. quadraphonic (H 04 S 5/00, H 04 S 7/00 take precedence) |
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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] |
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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 (arrangements for producing a reverberation or echo sound G 10 K 15/08) |
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5/ | 02 | . | of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals [3] |
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7/ | 00 | Indicating arrangements; Control arrangements, e.g. balance control [3] |
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