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) [3]
Note
In this subclass, the following expression is used with the meaning indicated:
-
"stereophonic systems" covers quadraphonic or similar systems. [3]
Systems employing more than two channels, e.g. quadraphonic (H 04 S 5/00, H 04 S 7/00 take precedence) [3]
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]
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) [3]
5
/
02
•
of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals [3]
7
/
00
Indicating arrangements; Control arrangements, e.g. balance control [3]
