| 摘要 |
PURPOSE: To make possible equalizer display and spectrum display in the state of reducing the degradation of an S/N with no distortion. CONSTITUTION: An input signal level adjusted by a volume 26 is supplied to an equalizer circuit 20, and prescribed frequency characteristics are applied based on a control signal for equalizer characteristic application from a control part 22. This input signal, to which the specified frequency characteristics are applied, is supplied to a power amplifier 28. A signal for spectrum analyzer is extracted by a band pass filter 32 provided on the preceding stage of the volume 26, and the extracted signal for analyzer is added with the control signal by the control part 22 and graphically displayed on a display means 24 later. Since the attenuated input signal is supplied to the equalizer circuit, no signal distortion is generated even when equalizer characteristics are applied to this circuit. Since volume adjusted signal is equalized, the S/N is not degraded, as well. |
