Patent ID: 9031260
Filing Date: 2015-05-12
Classification: H03G,H04R

Abstract:
1. An electronic musical apparatus comprising: a playback control circuit; a signal processing circuit that generates a digital low-band signal, a digital intermediate-band signal, and a digital high-band signal from an input digital sound signal, wherein at least the digital low-band signal and the digital high-band signal are combined and output from the signal processing circuit as a digital low-high band signal to the playback control circuit, and the digital intermediate-band signal is output separately from the signal processing circuit to the playback control circuit, wherein the signal processing circuit includes an adder that adds the digital low-band signal and the digital high-band signal with each other to provide the digital low-high-band signal, and wherein the playback control circuit obtains an analog low-band signal and an analog high-band signal from the digital low-high band signal output from the signal processing circuit, and an analog intermediate band signal from the digital intermediate-band signal output from the signal processing circuit; and a sound system including amplifiers that separately amplify the analog low-band signal, the analog intermediate-band signal, and the analog high-band signal, and speakers that emit sounds from the amplified analog low-band signal, the amplified analog intermediate-band signal, and the amplified analog high-band signal, wherein the analog low-band signal has a low frequency band while the other frequency bands are attenuated, the analog intermediate-band signal has an intermediate frequency band while the other frequency bands are attenuated, and the analog high-band signal has a high frequency band while the other frequency bands are attenuated, wherein the signal processing circuit includes a digital filter that separates the digital sound signal into the digital intermediate-band signal, the digital low-band signal, and the digital high-band signal, and wherein the playback control circuit comprises: wherein the first DA converter converts the digital low-high-band signal into the analog low-high-band signal containing a noise signal of a high frequency that is higher than the high-frequency band, and wherein the second analog filter comprises a low pass filter of a first order having a cutoff frequency that is arranged within the intermediate frequency band and obtains the analog low-band signal from the analog low-high-band signal while removing the noise signal from the analog low-high-band signal.