| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound field extending device in which LSI processing is easily attained by integrating a bass control function in an amplitude phase conversion circuit so as to eliminate the need for a capacitor of a large capacitance. SOLUTION: An amplitude phase conversion circuit 1a(1b) has an inverting amplifier 2a(2b), an amplitude phase characteristic providing circuit 3a(3b) providing a prescribed amplitude and phase characteristic to the output, and a feedback means that adds the output of the amplitude phase characteristic providing circuit 3a(3b) and the output of the inverting amplifier 2a(2b) to each input signal and feeds back the result to the inverting amplifier 2a(2b). The output of the inverting amplifier 2a and the output of the amplitude phase characteristic providing circuit 3b are added by an adder means 6a and the output of the inverting amplifier 2b and the output of the amplitude phase characteristic providing circuit 3a are added by an adder means 6a. D/A converters 5a, 5b are provided to feedback paths of the outputs of the amplitude phase characteristic providing circuits 3a(3b) to adjust the feedback signal level for bass control. |
