H04S - CPC Classification

• H04S1/00 » Two-channel systems 210
• H04S2400/00 » Details of stereophonic systems covered by but not provided for in its groups 3
• H04S2420/00 » Techniques used stereophonic systems covered by but not provided for in its groups 11
• H04S3/00 » Systems employing more than two channels, e.g. quadraphonic 467
• H04S5/00 » Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 409
• H04S7/00 » Indicating arrangements; Control arrangements, e.g. balance control 343