| 摘要 |
PURPOSE:To allow one matrix circuit to function as a reverse or normal matrix circuit if necessary by providing a switching circuit selecting a normal or reverse matrix resistance circuit. CONSTITUTION:In order to make the circuit function as the reverse matrix circuit, switches S1-S9 are turned off, switches S10 and S11 on, and a switch 12 is brought into a state where it is connected to the side of a connection point (b). In order to make the circuit function as the normal matrix circuit, the switches S1-S9 are switched to the reverse of said state. Namely, the switches S1-S9 are turned on, the switches S10 and S11 off, and the switch 12 is connected to the side of a contact point (a). In such a way the switches S1-S12 are changed over, and resistances provided on a route for signals which are outputted from amplifiers 2y, 2w and 2n and supplied to adders 6y, 6w and 6n, and the combination of said resistances are changed, whereby the circuit can be served as the reverse or normal one.
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