| 摘要 |
PURPOSE:To enable a correct reverse characteristic to be easily obtained by the use of an amplitude phase characteristic additional circuit itself by adding the outputs of a reverse amplifier and the amplitude phase characteristic additional circuit to the input signal then entering the output into a reverse input terminal. CONSTITUTION:A signal V1 entered from an input terminal 33 is inputted to the reverse input terminal of a reverse amplifier 36 through an adder 34. The output V2 of the reverse amplifier 36 is led to an output terminal 40 through a buffer amplifier 38 and also applied to the amplitude phase characteristic additional circuit 37, where an appropriate amplitude phase characteristic is applied. The output V3 of the buffer amplifier 38 is added t he output V4 of the additional circuit 37 by using an adder 44 and the result is added t the input signal in an adder 34 to be applied to he reverse input terminal of the reverse amplifier 36. If a sound field extender is constituted by using this circuit, reverse characteristics can easily be obtained without using another circuit adding the reverse characteristics used. |
